AAT3608IIC-1-T1 [ANALOGICTECH]
Power Management Circuit,;
| 型号： | AAT3608IIC-1-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | Power Management Circuit, |
| 文件： | 总44页 (文件大小：1608K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
General Description
Features
•
•
•
•
•
•
•
The AAT3608 is a member of AnalogicTech’s Total Power
Management IC™ (TPMIC™) product family. It contains
a single-cell lithium ion/polymer battery charger, two
800mA switching regulators, and five low dropout (LDO)
regulators in a small Pb-free 40-pin 5mmx5mm TQFN
package, making it ideal for portable space-constrained
systems. The single-input linear charger powers up from
an adapter or a USB port. The adapter charge current is
programmable with an external resistor or pin selectable
between 100mA and 500mA when connected to a USB
port. The device integrates a load switch for dynamic
power path and features deep sleep mode operation. The
step-down regulators are monolithic synchronous con-
verters integrating the compensation network and soft
start circuitry. The 1.5MHz operating frequency enables
the use of tiny 2.2μH inductors and small 4.7μF output
capacitors. External resistors set the output voltage for
Buck 1 and Buck 2; the output voltage of Buck 2 is
dynamically adjustable with I2C. The LDO regulators fea-
ture 3% output voltage accuracy over the full operating
temperature range. The fast control loop of the LDO
regulators also provide excellent transient response with
a typical output voltage deviation of 1.5%. The AAT3608
provides protection features to safeguard from over-
temperature operation, over-current operation, and a
digital thermal loop to protect the battery during battery
charging. The device is rated over an ambient tempera-
ture range of -40°C to 85°C.
2.7V to 5.5V Operating Input Voltage Range
Adapter or USB Single Input Linear Charger
Battery Charger Digital Thermal Regulation
Battery Temperature Monitoring
Battery Charger Includes Programmable Timer
Input Load Switch
Dual 800mA Monolithic Switching Converters
1.5MHz Switching Frequencies
95% Efficiency
Independent Input Power and Ground
Buck1 Output Programmable With External
▪
▪
▪
▪
Resistors
Buck 2 Feedback Voltage is Dynamically Adjustable
▪
between 0.5V and 0.7V with I2C Interface
Five Channel LDO Regulators
•
300mA, Output Adjustable via Two Logic Inputs
▪
80mA, Output Adjustable via I2C Interface
▪
50mA, 2.5V Output Voltage
50mA, 3.3V Output Voltage
80mA with 1.2V Fixed Output
3% Accuracy and 1.5% Typical Transient Accuracy
▪
▪
▪
▪
•
•
•
Very Low Shutdown Current
Power-On Push Button
Status Outputs
Interrupt, Reset and Status Pins, Low Battery Flag
Separate Enable Pin for LDO2, LDO4, LDO5, and
Buck2 (when mask is removed)
▪
•
•
•
Over-Current and Over-Thermal Protection
5mmx5mm, 40-Pin TQFN Package
Applications
•
•
•
•
•
GPS
Handheld Devices
Mobile Media Players
MP3
Portable Navigation
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3608.2010.08.1.3
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PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Application Circuit
VIN
VBAT
SYSOUT
CSYSOUT
SYSOUT
SYSOUT
INBUCK
INLDO
INLDO
LX1
C3
PWR_ID
USBSEL
S2
C2
C1
S1
L1
EXT_ON
Buck1
PWR_ON
PWR_HOLD
PWR_EN
SDA
Buck2
C10
R2
R3
C8
FB1
R4
R5
AAT3608
SCL
TS
L2
LX2
FB2
PBSTAS
INT
STAT
LBO
LBI
LDO1
LDO2
LDO3
LDO4
LDO1
LDO2
LDO3
LDO4
LDO5
RESET
ISETA
CT
LDO5
C15
C17
R6
C13
C14
C16
C12
PGND PGND1 PGND2
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Pin Descriptions
Pin #
Symbol
Function
1
STAT
Open drain (pull-down) output for battery charging status.
Input pin for charge current programming for the adapter. Connect a 1.24kΩ resistor to get 800mA of charging current. Can be
used to monitor charging current.
2
3
4
ISETA
TS
Battery temperature sense pin with 75μA output current. Connect the battery’s NTC 10kΩ resistor from this pin to ground.
A Beta range of 3300 to 4000 will place the typical charging temperature between -4°C and 48°C.
Charger safety timer pin. A 0.1μF ceramic capacitor should be connected between this pin and GND. Connect directly to GND to
disable the timer function.
CT
5
6
LDO2
INLDO
LDO3
LDO1
INLDO
LDO4
LDO5
Output for LDO2 regulator.
Input power for LDO regulators.
Output for LDO3 regulator.
Output for LDO1 regulator.
Input power for LDO regulators.
Output for LDO4 regulator.
Output for LDO5 regulator.
7
8
9
10
11
Open drain (pull-down) output for PWR_ON status. When PWR_ON is high, PBSTAS will be low (after the debounce time). When
PWR_ON is low, PBSTAS will be high (or equal to the voltage to which that external pull-up resistor is connected).
12
13
14
PBSTAS
RESET
INT
Open drain (pull-down) active-low output for reset. After Buck2 is OK, there is a delay of 200ms before RESET goes High. RESET
pin is low in shutdown.
Open drain (pull-down) active-low output for interrupt. When any of the I2C read bits (except the DS_RDY and PWR_DS bits)
change state this pin will pull low. It will be released again after a read from the I2C is complete.
15
16
17
18
19
LBO
LBI
GND
S2
Open drain (pull-down) active-low output for low-battery comparator. When the battery is low, LBO will pull down.
Feedback input for low-battery comparator. The LBI threshold is 1.0V.
Ground.
S1 and S2 bits set the output voltage for LDO1.
S1
S1 and S2 bits set the output voltage for LDO1.
Enable for LDO2, LDO4, and LDO5 for default condition. Buck2 can also be controlled by PWR_EN only if the SOC masks
PWR_EN through I2C, refer to the "I2C Serial Interface and Programmability" section of this datasheet for additional information.
20
PWR_EN
21
22
FB2
PGND2
LX2
Feedback input for Buck2 regulator.
Power ground for Buck2 regulator.
Switching node for Buck2 regulator.
Input power for Buck regulators.
Switching node for Buck1 regulator.
Power ground for Buck1 regulator.
Feedback input for Buck1 regulator.
Input for lithium-ion battery.
I2C serial data pin.
23
24
INBUCK
LX1
25
26
PGND1
FB1
27
28, 29
30
BAT
SDA
31
SCL
I2C serial clock pin.
Enable for the system. PWR_HOLD must be held high by the processor to keep system turned on. To shut down the device, the
microcontroller should pull PWR_HOLD to ground.
32
33
34
PWR_HOLD
PWR_ON
EXT_ON
Enable for the system. Connect a push-button from this pin to BAT to activate system. It is debounced for 320ms.
Alternate system enable; may be used by the RTC alarm or other system input. This pin's function is similar to PWR_ON; it has a
similar 320ms debounce but does not affect the PBSTAS pin.
35, 36
37
SYSOUT
PWR_ID
PWR_IN
System output. Connect to the INLDO and INBUCK input supply pins.
Logic input to identify the source of PWR_IN.
38, 39
Power Input. System input from adapter or USB.
Logic input to select 500mA current limit and fast charge current (USBSEL=H) or 100mA current limit and fast charge
(USBSEL=L). An internal pull-down resistor is connected to this pin. If is left floating,USBSEL is pulled to ground.
40
EP
USBSEL
EP
For best thermal performance the exposed thermal pad must be thermally connected to a large exposed copper pad underneath
the package. Additionally, the exposed thermal pad (EP), GND, and PGND must be electrically connected to ground copper.
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PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Pin Configuration
TQFN55-40
(Top View)
40
39
38
37
36
35
34
33
32
31
1
2
3
4
30
29
28
27
STAT
ISETA
TS
SDA
BAT
BAT
FB1
PGND1
LX1
INBUCK
LX2
PGND2
FB2
CT
5
6
7
26
25
24
LDO2
INLDO
LDO3
LDO1
INLDO
LDO4
EP
8
9
23
22
21
10
11
12
13
14
15
16
17
18
19
20
Absolute Maximum Ratings1
Symbol
Pin Name
Value
Units
PWR_IN, PWR_ID, BAT, SYSOUT, SDA, SCL, RESET, STAT, USBSEL, ISETA, TS, CT, LBI,
LBO, INT, PWR_EN, PWR_HOLD, PWR_ON, PBSTAS, EXT_ON, S1, S2 Voltage to GND
-0.3 to 6.5
V
-0.3 to
VSYSOUT + 0.3
-0.3 to
VINBUCK + 0.3
-0.3 to
VINLDO + 0.3
-0.3 to +0.3
-40 to 150
-40 to 85
-65 to 150
300
INBUCK, INLDO Voltage to GND
V
V
LX1, LX2, FB1, FB2 Voltage to PGND1, PGND2
LDO1, LDO2, LDO3, LDO4, LDO5 Voltage to GND
V
V
PGND1, PGND2 to GND
Operating Junction Temperature Range
Ambient Temperature Range
Storage Temperature Range
Maximum Junction Soldering Temperature (at leads, 10 sec.)
TJ
TA
TS
°C
TLEAD
Thermal Information2, 3, 4
Symbol
Description
Value
Units
θJA
PD
Thermal Resistance
Maximum Power Dissipation
25
4
°C/W
W
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Thermal Resistance will be measured with the AAT3608 device on the 4-layer FR4 evaluation board in a thermal oven. The amount of power dissipation which will cause the
thermal shutdown to activate will depend on the ambient temperature and the PC board layout ability to dissipate the heat.
3. Measured on the AAT3608 demo board.
4. Derate the maximum power dissipation by 40mW/°C above 25°C ambient temperature.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Electrical Characteristics1
VPWR_IN = 5V, VPWR_ID = 5V, VBAT = 3.6V, -40°C ≤ TA ≤ +85°C, unless noted otherwise. Typical values are TA = 25°C.
Symbol Description
Power Supply
Conditions
Min Typ Max Units
VIN
VINBUCK, VINLDO Input Operating Voltage
PWR_IN UVLO Threshold
2.7
5.5
V
V
Rising (100mV hysteresis)
VPWR_IN = 0V, Only LDO1, LDO3, and
Buck1 are on
VPWR_IN = 0V, Only Buck1 is on
VPWR_IN = 0V and system is shut down
4.5
200
100
IOPS
Sleep Mode Battery Operating Current
ꢀA
IOPDS
ISHDN
Deep-Sleep Mode Battery Operating Current
Battery Shutdown Current
ꢀA
ꢀA
10
Charger Voltage Regulation
VBAT_REG Output Charge Voltage Regulation
VMIN
0°C ≤ TA ≤ +70°C
4.158
2.6
4.2
2.8
4.00
4.242
3.0
V
V
V
Preconditioning Voltage Threshold
Battery Recharge Voltage Threshold
VRCH
Charger Current Regulation
RISETA = 1.24kΩ (for 0.8A) (Can be set
to up to 1.2A)
ICH_CC
Constant-Current Mode ADP Charge Current
800
mA
USB Charge Current
USB Charge Current
Charge Current Set Factor: ICH_CC/IISET
Preconditioning Charge Current
Charge Termination Threshold Current
USBSEL = H, PWR_ID = L
USBSEL = L, PWR_ID = L
Constant Current Mode
RISETA = 1.24kΩ
500
100
800
12
mA
mA
/
mA
% ICH_CC
% ICH_CC
mA
KISET
ICH_PRE
ICH_TERM
5
Charging Device
RDS(ON),CHG On-Resistance of Charging Transistor
Logic Control / Protection
SYSOUT to BAT Switch
0.6
0.9
Ω
VPWR_HOLD
VPWR_ON
VUSBSEL
,
Input High Threshold
1.4
V
V
,
Input Low Threshold
0.3
0.4
V
INT, VSTAT
VOVP
IOCP
TC
Output Low Voltage
Pin Sinks 4mA
CCT = 100nF
V
V
Over-Voltage Protection Threshold
Over Current Protection Threshold
Constant Current Mode Time Out
Trickle Charge Time Out
Constant Voltage Mode Time Out
Current Source from TS Pin
4.3
105
3
TC/8
3
% ICH_CC
Hours
Hours
Hours
ꢀA
TK
TV
ITS
69
75
79
Falling Threshold
Hysteresis
Rising Threshold
Hysteresis
318
331
25
2.39
25
346
mV
mV
V
mV
TS1
TS2
TS Hot Temperature Fault
TS Cold Temperature Fault
2.30
2.48
TLOOP_IN
TLOOP_OUT
TREG
Thermal Loop Entering Threshold
Thermal Loop Exiting Threshold
Thermal Loop Regulation
115
85
100
°C
°C
°C
Load Switches / SYSOUT LDO
RDS(ON),
BAT-SYSOUT
On-Resistance of BAT-SYSOUT Load Switch
100
0.2
150
0.3
mΩ
RDS(ON),
PWR_IN-SYSOUT
On-Resistance of PWR_IN-SYSOUT Load
Switch
Ω
PWR_IN-SYSOUT Current Limit
PWR_IN-SYSOUT Current Limit
BAT-SYSOUT Current Limit
2
A
USBSEL = High, PWR_ID = L
USBSEL = Low, PWR_ID = L
400
450
100
2
500
mA
mA
A
1. Specification over the -40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
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3608.2010.08.1.3
5
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Electrical Characteristics (continued)1
VPWR_IN = 5V, VPWR_ID = 5V, VBAT = 3.6V, -40°C ≤ TA ≤ +85°C, unless noted otherwise. Typical values are TA = 25°C.
Symbol Description
Conditions
Min
Typ
Max Units
Step-Down Buck Regulator (Buck1)
VINBUCK
VOUT
VREG
Input Voltage Range
Output Voltage Programmable Range
Output Voltage Accuracy
2.7
0.6
5.5
VINBUCK
V
V
V
Using External Feedback Resistors, No Load
IOUT = 10mA
0.582 0.600 0.618
ILIM
P-Channel Current Limit
High-Side Switch On-Resistance
Low-Side Switch On-Resistance
2600
450
400
mA
mΩ
mΩ
RDS(ON)H
RDS(ON)L
ΔVOUT
/
Line Regulation
0.2
1.5
%/V
MHz
(VOUT ΔVIN)
FOSC
Oscillator Frequency
Step-Down Buck Regulator (Buck2)
VINBUCK
VFB
VREG
Input Voltage Range
Feedback Voltage Programmable Range Using I2C, with Default FB = 0.6V
2.7
0.5
-3
5.5
0.7
+3
V
V
%
Output Voltage Accuracy
IOUT = 10mA
ILIM
P-Channel Current Limit
High-Side Switch On-Resistance
Low-Side Switch On-Resistance
2600
450
400
mA
mΩ
mΩ
RDS(ON)H
RDS(ON)L
ΔVOUT
/
Line Regulation
0.2
1.5
%/V
MHz
(VOUT ΔVIN)
FOSC
Oscillator Frequency
Low-Dropout Regulator (LDO1)
VINLDO
Input Voltage Range
2.7
5.5
V
V
V
V
ILDO = 1mA to 300mA, S1 = 0, S2 = 0
ILDO = 1mA to 300mA, S1 = 0, S2 = 1
ILDO = 1mA to 300mA, S1 = 1, S2 = 0
2.91
3.20
2.71
3.00
3.30
2.80
3.09
3.40
2.89
VLDO
LDO Output Voltage
VINLDO = 5V, added quiescent current when
LDO is enabled
IQ
LDO Quiescent Current
50
90
ꢀA
Line Regulation
Dropout Voltage
LDO Maximum Load Current
LDO Current Limit
ILDO = 10mA
ILDO = 300mA
0.09
100
%/V
mV
mA
mA
170
ILDO
ILDO(LIM)
500
800
Low-Dropout Regulator (LDO2)
VINLDO
Input Voltage Range
2.7
5.5
V
V
VLDO
LDO Output Voltage
ILDO = 1mA to 80mA
1.164
1.2
1.236
VINLDO = 5V, added quiescent current when
LDO is enabled
IQ
LDO Quiescent Current
35
80
ꢀA
Line Regulation
LDO Maximum Load Current
LDO Current Limit
ILDO = 10mA
0.09
%/V
mA
mA
ILDO
ILDO(LIM)
200
800
Low-Dropout Regulator (LDO3)
VINLDO
Input Voltage Range
Output Voltage Range
2.7
0.8
5.5
1.4
V
V
Using I2C. Default=1.2V
ILDO = 1mA to 80mA
VLDO
IQ
LDO Output Voltage
-3
+3
%
VINLDO = 5V, added quiescent current when
LDO is enabled
LDO Quiescent Current
35
80
ꢀA
Line Regulation
LDO Maximum Load Current
LDO Current Limit
ILDO = 10mA
0.09
%/V
mA
mA
ILDO
ILDO(LIM)
200
800
1. Specification over the -40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Electrical Characteristics (continued)1
VPWR_IN = 5V, VPWR_ID = 5V, VBAT = 3.6V, -40°C ≤ TA ≤ +85°C, unless noted otherwise. Typical values are TA = 25°C.
Symbol Description
Conditions
Min
Typ Max
Units
Low-Dropout Regulator (LDO4)
VINLDO
VLDO
Input Voltage Range
LDO Output Voltage
2.7
5.5
V
V
ILDO = 1mA to 50mA
2.425
2.5
50
2.575
VINLDO = 5V, added quiescent current
when LDO is enabled
IQ
LDO Quiescent Current
80
ꢀA
Line Regulation
LDO Maximum Load Current
LDO Current Limit
ILDO = 10mA
0.09
%/V
mA
mA
ILDO
ILDO(LIM)
200
800
Low-Dropout Regulator (LDO5)
VINLDO
VLDO
Input Voltage Range
LDO Output Voltage
2.7
3.2
5.5
3.4
V
V
ILDO = 1mA to 50mA
3.3
50
VINLDO = 5V, added quiescent current
when LDO is enabled
IQ
LDO Quiescent Current
80
ꢀA
Line Regulation
LDO Maximum Load Current
LDO Current Limit
ILDO = 10mA
0.09
%/V
mA
mA
ILDO
ILDO(LIM)
200
800
Reset and Low-Battery Comparator
Rising threshold
Hysteresis
91
%
%
Buck2 Power OK Threshold
3
From Power OK of BUCK2 output to
RESET pin rising edge
Reset Time
200
ms
Falling Edge
Hysteresis
0.96
1.0
50
1.04
V
mV
Low-Battery Threshold Voltage
Thermal
TSD
THYS
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Rising
140
15
°C
°C
SCL, SDA (I2C Interface)
FSCL
TLOW
THIGH
THD_STA
TSU_STA
TSU_DAT
THD_DAT
TSU_STO
Clock Frequency
Clock Low Period
Clock High Period
Hold Time for START Condition
Set-up Time for Repeated START Condition
Data Setup Time
Data Hold Low Time
Setup Time for STOP Condition
Bus Free Time Between STOP and START
Condition
Input Threshold Low
Input Threshold High
Input Leakage Current
Output Logic Low (SDA)
0
400
kHz
ꢀs
ꢀs
ꢀs
ꢀs
ns
ꢀs
ꢀs
1.3
0.6
0.6
0.6
100
0.9
0.3
0.6
1.3
TBUF
ꢀs
VIL
VIH
II
2.7V ≤ VIN ≤ 5.5V
2.7V ≤ VIN ≤ 5.5V
V
V
ꢀA
V
1.4
-1.0
1.0
0.3
VOL
IPULLUP = 3mA
1. Specification over the -40°C to +85°C operating temperature range is assured by design, characterization and correlation with statistical process controls.
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PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−Charger
Power-In to SYSOUT Switch Current Limit
Power-In to SYSOUT Switch Current Limit
(100mA)
180
2.5
160
140
120
100
80
2.0
1.5
1.0
0.5
0.0
60
40
0.5A
2.0A
20
0
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 3.9 4.2
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 3.9 4.2
V(PWRIN-SYSOUT) (V)
V(PWRIN-SYSOUT) (V)
IBAT vs. Temperature
IBAT vs. Temperature
(100mA)
(500mA)
501
500
499
498
497
496
495
494
493
100.2
100.0
99.8
99.6
99.4
99.2
99.0
98.8
98.6
98.4
-60
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Ideal Diode Load Switch between VBAT and VSYSOUT
Constant Charging Current vs. RSET
3.0
2.5
2.0
1.5
1.0
0.5
0.0
10000
1000
100
10
1
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.1
1
10
100
1000
V(BAT-SYSOUT) (V)
RSET (kΩ)
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−Charger
Adapter Mode Supply Current vs. RSET Resistor
5.0
Constant Current
Preconditioning
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.1
1
10
100
1000
RSET (kΩ)
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3608.2010.08.1.3
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PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−Buck1
Efficiency vs. Load
Load Regulation
(VB1 = 2.5V; L1 = 2.2μH)
(VB1 = 2.5V; L1 = 2.2μH)
100
90
80
70
60
50
40
30
20
10
0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
VBAT = 3.3V
BAT = 3.6V
VBAT = 3.9V
BAT = 4.2V
VBAT = 3.3V
BAT = 3.6V
VBAT = 3.9V
BAT = 4.2V
V
V
V
V
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
No Load Total Input Current vs. VBAT Voltage
Output Ripple
(VEN = VBAT; Closed Loop)
(VBAT = 3.6V; VB1 = 2.5V; IOUTB1 = 1mA)
0.50
85°C
25°C
-40°C
3.6
0
0.45
2.55
2.50
2.45
0.40
0.35
0.30
0.2
0.0
3.6
3.7
3.8
3.9
4.0
4.1
4.2
VBAT Voltage (V)
Time (100μs/div)
Output Ripple
System Line Transient Response
(VBAT = 3.6V; VB1 = 2.5V; IOUTB1 = 800mA)
(VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB1 = 2.5V; IOUTB1 = 800mA; falling)
6
3.6
0
5
4
2.52
3
2.50
2.48
2
2.7
2.5
2.3
2.1
1.0
0.8
0.6
Time (500ns/div)
Time (200μs/div)
w w w . a n a l o g i c t e c h . c o m
10
3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−Buck1 (continued)
System Line Transient Response
System Load Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB1 = 2.5V; IOUTB1 = 800mA; rising)
(IOUTB1 = 80mA to 800mA; VBAT = 3.6V; COUTB1 = 4.7μF; CFF1 = 0pF)
6
1.5
5
1.0
0.5
0.0
800mA
4
80mA
3
2
2.7
2.5
2.3
2.1
2.7
2.5
2.3
2.1
Time (200μs/div)
Time (100μs/div)
Line Regulation
Output Voltage Error vs. Temperature
(VOUT1 = 2.5V; L1 = 2.2μH)
(VBAT = 3.6V; VOUT1 = 2.5V)
0.3
0.2
0.1
0.0
1.5
IOUT1 = 10mA
OUT1 = 100mA
IOUT1 = 400mA
OUT1 = 800mA
I
1.0
0.5
I
0.0
-0.1
-0.5
-1.0
-1.5
IOUT = 50mA
IOUT = 100mA
-0.2
-0.3
IOUT = 400mA
IOUT = 800mA
3.3
3.5
3.7
3.9
4.1
4.3
4.5
-50
-25
0
25
50
75
100
V
BAT Voltage (V)
Temperature (°C)
Switching Frequency vs. Temperature
Switching Frequency vs. VBAT Voltage
(VIN = 3.6V; VOUT1 = 2.5V; IOUT1 = 800mA)
(VOUT1 = 2.5V; IOUT1 = 800mA)
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
1.52
1.51
1.50
1.49
1.48
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
-40
-20
0
20
40
60
80
100
Temperature (°C)
VBAT Voltage (V)
w w w . a n a l o g i c t e c h . c o m
3608.2010.08.1.3
11
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−Buck1 (continued)
Soft Start
(VBAT = 3.6V; VOUT1 = 2.5V; IOUT1 = 800mA; CFF = 100pF)
4
3
2
1
0
1.0
0.5
0.0
Time (100μs/div)
w w w . a n a l o g i c t e c h . c o m
12
3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−Buck2
Efficiency vs. Load
DC Regulation vs. Load
(VB2 = 1.2V; L2 = 2.2μH)
(VB2 = 1.2V; L2 = 2.2μH)
100
90
80
70
60
50
40
30
20
10
0
2.5
2.0
VBAT = 3.3V
BAT = 3.6V
VBAT = 3.9V
BAT = 4.2V
V
1.5
1.0
V
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
VBAT = 3.3V
BAT = 3.6V
VBAT = 3.9V
BAT = 4.2V
V
V
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Output Ripple
Output Ripple
(VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 1mA)
(VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 800mA)
3.6
3.6
0
0
1.22
1.20
1.18
1.22
1.20
1.18
0.4
0.2
0.0
1.0
0.8
0.6
Time (50μs/div)
Time (500ns/div)
System Line Transient Response
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 800mA; falling)
(VIN = 3.5V to 5V; VBAT = 3.6V; VOUTB2 = 1.2V; IOUTB2 = 800mA; rising)
6
6
5
5
4
4
3
3
2
2
1.3
1.2
1.1
1.0
1.3
1.2
1.1
1.0
Time (200μs/div)
Time (200μs/div)
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3608.2010.08.1.3
13
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−Buck2 (continued)
System Load Transient Response
Line Regulation
(IOUTB2 = 80mA to 800mA; VBAT = 3.6V; COUTB2 = 4.7μF; CFF1 = 0pF)
(VOUT2 = 2.5V; L2 = 2.2μH)
0.3
0.2
1.5
IOUT2 = 10mA
OUT2 = 50mA
IOUT2 = 100mA
OUT2 = 400mA
IOUT2 = 800mA
1.0
0.5
0.0
800mA
I
80mA
I
0.1
0.0
1.3
1.2
1.1
1.0
-0.1
-0.2
-0.3
3.2
3.4
3.6
3.8
4.0
4.2
4.4
V
BAT Voltage (V)
Time (100μs/div)
Output Voltage Error vs. Temperature
Soft Start
(VBAT = 3.6V; VOUT2 = 1.2V)
(VBAT = 3.6V; VOUT1 = 1.2V; IOUT2 = 800mA; CFF = 100pF)
1.5
4
3
1.0
0.5
2
1
0
0.0
1.0
0.5
0.0
-0.5
-1.0
-1.5
IOUT2 = 10mA
OUT2 = 100mA
IOUT2 = 400mA
OUT2 = 800mA
I
I
-50
-25
0
25
50
75
100
Temperature (°C)
Time (100μs/div)
w w w . a n a l o g i c t e c h . c o m
14
3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO1
System Line Transient Response
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO1 = 3V; ILDO1 = 300mA; rising)
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO1 = 3V; ILDO1 = 300mA; falling)
6
6
5
4
3
5
4
3
3.2
3.1
3.0
2.9
2.8
3.1
3.0
2.9
2.8
Time (200μs/div)
Time (200μs/div)
Output Voltage Error vs. Temperature
Line Regulation
(VBAT = 3.6V; VLDO1 = 3.0V)
(VLDO1 = 3.0V)
0.3
1.5
1.0
0.5
IOUT = 0.1mA
IOUT = 1mA
OUT = 10mA
0.2
I
IOUT = 100mA
IOUT = 150mA
0.1
0.0
I
OUT = 300mA
0.0
IOUT = 0.1mA
IOUT = 10mA
-0.1
-0.2
-0.3
-0.5
IOUT = 100mA
OUT = 150mA
IOUT = 300mA
-1.0
I
-1.5
-50
3.4
3.6
3.8
4.0
4.2
4.4
-25
0
25
50
75 100
Temperature (°C)
VBAT Voltage (V)
Load Transient Response
Load Regulation
(ILDO1 = 30mA to 300mA; VBAT = 3.6V; VLDO1 = 3V; CLDO1 = 4.7μF)
(VBAT = 3.6V; VLDO1 = 3.0V)
0.4
1.5
0.3
1.0
0.5
0.2
0.1
0.0
0.0
3.05
3.00
2.95
2.90
-0.5
-1.0
-1.5
0.1
1
10
100
1000
Output Current (mA)
Time (200μs/div)
w w w . a n a l o g i c t e c h . c o m
3608.2010.08.1.3
15
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO1 (continued)
Soft Start
(VBAT = 3.6V; VLDO1 = 3.0V; ILDO1 = 150mA)
4
3
2
1
0
200
100
0
Time (100μs/div)
w w w . a n a l o g i c t e c h . c o m
16
3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO2
System Line Transient Response
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO2 = 1.2V; ILDO2 = 80mA; rising)
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO2 = 1.2V; ILDO2 = 80mA; falling)
6
5
4
3
6
5
4
3
2
1.3
1.2
1.1
1.0
1
0
1.3
1.2
1.1
1.0
Time (200μs/div)
Time (200μs/div)
Load Transient Response
Output Voltage Error vs. Temperature
(ILDO2 = 8mA to 80mA; VBAT = 3.6V; VLDO2 = 1.2V; CLDO2 = 4.7μF)
(VBAT = 3.6V; VLDO2 = 1.2V)
150
100
50
1.5
1.0
0.5
0.0
0
1.22
1.20
1.18
1.16
-0.5
IOUT = 0.1mA
I
OUT = 1mA
-1.0
IOUT = 10mA
IOUT = 100mA
-1.5
-50
-25
0
25
50
75
100
Temperature (°C)
Time (200μs/div)
Line Regulation
Load Regulation
(VLDO2 = 1.2V)
(VBAT = 3.6V; VLDO2 = 1.2V)
1.5
1.0
0.3
0.2
0.1
0.0
0.5
0.0
-0.1
-0.5
-1.0
-1.5
IOUT = 0.1mA
IOUT = 1mA
-0.2
-0.3
I
I
OUT = 10mA
OUT = 100mA
3.2
3.4
3.6
3.8
4.0
4.2
4.4
0.1
1
10
100
V
BAT Voltage (V)
Output Current (mA)
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3608.2010.08.1.3
17
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO2 (continued)
Soft Start
(VBAT = 3.6V; VLDO2 = 1.2V; ILDO2 = 80mA)
4
3
2
1
0
100
50
0
Time (100μs/div)
w w w . a n a l o g i c t e c h . c o m
18
3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO3
System Line Transient Response
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO3 = 1.2V; ILDO3 = 80mA; rising)
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO3 = 1.2V; ILDO3 = 80mA; falling)
6
5
4
3
6
5
4
3
1.4
1.3
1.2
1.1
1.0
1.3
1.2
1.1
1.0
Time (200μs/div)
Time (200μs/div)
Load Transient Response
Line Regulation
(ILDO3 = 8mA to 80mA; VBAT = 3.6V; CLDO3 = 4.7μF)
(VLDO3 = 1.2V)
150
100
50
0.3
0.2
0.1
0.0
0
1.22
1.20
1.18
1.16
-0.1
IOUT = 0.1mA
IOUT = 1mA
OUT = 10mA
IOUT = 100mA
-0.2
-0.3
I
3.2
3.4
3.6
3.8
4.0
4.2 4.4
V
BAT Voltage (V)
Time (200μs/div)
Output Voltage Error vs. Temperature
Load Regulation
(VBAT = 3.6V; VLDO3 = 1.2V)
(VBAT = 3.6V; VLDO3 = 1.2V)
1.5
1.5
1.0
0.5
0.0
1.0
0.5
0.0
-0.5
-1.0
-1.5
-0.5
IOUT = 0.1mA
IOUT = 1mA
-1.0
IOUT = 10mA
IOUT = 100mA
-1.5
-50
-25
0
25
50
75
100
0.1
1
10
100
Temperature (°C)
Output Current (mA)
w w w . a n a l o g i c t e c h . c o m
3608.2010.08.1.3
19
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO3 (continued)
Soft Start
(VBAT = 3.6V; VLDO3 = 1.2V; ILDO3 = 80mA)
4
3
2
1
0
100
50
0
Time (100μs/div)
w w w . a n a l o g i c t e c h . c o m
20
3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO4
System Line Transient Response
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO4 = 2.5V; ILDO4 = 50mA; rising)
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO4 = 2.5V; ILDO4 = 50mA; falling)
6
6
5
5
4
4
3
3
2.7
2.6
2.5
2.4
2.3
2.7
2.6
2.5
2.4
2.3
Time (200μs/div)
Time (200μs/div)
Load Transient Response
Line Regulation
(ILDO4 = 5mA to 50mA; VBAT = 3.6V; VLDO4 = 2.5V; CLDO4 = 4.7μF)
(VLDO4 = 2.5V)
150
100
50
0.3
0.2
0.1
0.0
0
2.52
2.50
2.48
2.46
-0.1
IOUT = 0.1mA
IOUT = 1mA
OUT = 10mA
-0.2
I
IOUT = 100mA
-0.3
3.2
3.4
3.6
3.8
4.0
4.2
4.4
V
BAT Voltage (V)
Time (200μs/div)
Output Voltage Error vs. Temperature
Load Regulation
(VBAT = 3.6V; VLDO4 = 2.5V)
(VBAT = 3.6V; VLDO4 = 2.5V)
1.5
1.5
1.0
0.5
0.0
1.0
0.5
0.0
-0.5
-1.0
-1.5
-0.5
IOUT = 0.1mA
I
OUT = 1mA
IOUT = 10mA
OUT = 100mA
-1.0
I
-1.5
-50
-25
0
25
50
75
100
0.1
1
10
100
Temperature (°C)
Output Current (mA)
w w w . a n a l o g i c t e c h . c o m
3608.2010.08.1.3
21
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO4 (continued)
Soft Start
(VBAT = 3.6V; VLDO4 = 2.5V; ILDO4 = 50mA)
4
3
2
1
0
100
50
0
Time (100μs/div)
w w w . a n a l o g i c t e c h . c o m
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO5
System Line Transient Response
System Line Transient Response
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO5 = 3.3V; ILDO5 = 50mA; rising)
(VIN = 3.5V to 5V; VBAT = 3.6V; VLDO5 = 3.3V; ILDO5 = 50mA; falling)
6
6
5
5
4
4
3
3
3.5
3.4
3.3
3.2
3.1
3.5
3.4
3.3
3.2
3.1
Time (200μs/div)
Time (200μs/div)
Load Transient Response
Line Regulation
(ILDO5 = 5mA to 50mA; VBAT = 3.9V; CLDO5 = 4.7μF)
(VLDO5 = 3.3V)
150
0.3
0.2
0.1
0.0
100
50
0
3.34
3.32
3.30
3.28
3.26
-0.1
IOUT = 0.1mA
I
OUT = 1mA
-0.2
-0.3
IOUT = 10mA
I
OUT = 100mA
3.6
3.8
4.0
4.2
4.4
V
BAT Voltage (V)
Time (200μs/div)
Output Voltage Error vs. Temperature
Load Regulation
(VBAT = 3.6V; VLDO4 = 3.3V)
(VBAT = 3.6V; VLDO5 = 3.3V)
1.5
1.5
1.0
0.5
0.0
1.0
0.5
0.0
-0.5
-1.0
-1.5
-0.5
IOUT = 0.1mA
I
OUT = 1mA
-1.0
IOUT = 10mA
I
OUT = 100mA
75
-1.5
-50
-25
0
25
50
100
0.1
1
10
100
Temperature (°C)
Output Current (mA)
w w w . a n a l o g i c t e c h . c o m
3608.2010.08.1.3
23
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Typical Characteristics−LDO5 (continued)
Soft Start
(VBAT = 3.6V; VLDO5 = 3.3V; ILDO5 = 50mA)
4
3
2
1
0
0.10
0.05
0.00
Time (100μs/div)
w w w . a n a l o g i c t e c h . c o m
24
3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Functional Block Diagram
1 Cell Li-Ion
To INBUCK, INLDO
+
INBUCK
24
SYSOUT
BAT
35,36
28,29
38,39
Load
Switch
PWR_IN
L1
LX1
25
26
BUCK1
800mA max
0.6V to 5.5V
Charge
Switch
PGND1
Buck1
37
PWR_ID
27
13
40
FB1
USBSEL
SYSOUT
2
LBO
ISETA
Li-Ion
Reset
Buck2
3
Linear
Charger
Control
RESET
TS
INBUCK
Thermal
Shutdown
4
BAT
CT
L2
23
LX2
1
BUCK2
800mA max
0.6V (default)
FB2 is I2C adj.
from 0.5V to 0.7V
STAT
BUCK1
22
21
PGND2
12
PBSTAS
FB2
20
PWR_EN
INLDO
33
PWR_ON
6,9
8
320ms Debounce
320ms Debounce
2µ
2µ
34
Enable
Control and
I2C Logic
EXT_ON
LDO1
300mA max
3.3V/3.0V/2.8V (S1 & S2 bits)
1.2V (fixed)
LDO1
32
Buck1 OK
5
PWR_HOLD
LDO2
LDO2
LDO3
80mA max
14
INT
7
1.2V (default)
Output is I2C adj.
from 1.0V to 1.4V
LDO3
80mA max
30
SDA
31
10
11
SCL
LDO4
50mA max
2.5V (default)
3.3V/2.85V/2.5V/1.8V (I2C)
15
BAT
LDO4
LDO5
LBO
+
1.0V
-
16
3.3V (default)
3.3V/3.0V/1.5V/1.2V (I2C)
LDO5
50mA max
LBI
17
19
18
S1
S2
GND
tem to operate regardless of the state of the battery. It
can even operate with no battery.
Functional Description
The AAT3608 is a complete power management solution.
It seamlessly integrates a battery charger with two step-
down converters and five low-dropout regulators to pro-
vide power from either an external power source or a
single-cell Lithium Ion/Polymer battery. Internal load
switches allow the converters to operate from the best
available power source.
System Output (SYSOUT)
Intelligent control of the integrated load switches is
managed by the switch control circuitry. If the voltage
across PWR_IN and GND pin is above the UVLO typical
threshold voltage of 4.5, then the switch control will
automatically short the load switch connecting PWR_IN
to SYSOUT. Additionally, the charging switch will be
enabled and switch connecting BAT and SYSOUT will be
turned off. The location of the two switches and the bat-
tery charging switch allows the step-down converter and
LDO to always have the best available source of power.
Furthermore, AAT3806 control logic allows the voltage
converters to operate with no battery, or with a battery
voltage below the trickle charge threshold.
If only the battery is available, then the voltage convert-
ers are powered directly from the battery through a 100
mΩ load switch (BAT to SYSOUT). During this condition,
the charger is put into sleep mode and draws less than
1ꢀA quiescent current. If the system is connected to a
wall adapter, then the voltage converters are powered
directly from the adapter through a 200mΩ load-switch
(PWR_IN to SYSOUT) and the battery is disconnected
from the voltage converter inputs. This allows the sys-
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3608.2010.08.1.3
25
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
settings of 100mA or 500mA; refer to the logic settings
Battery Charging
in Table 2. Constant-current charging continues until the
Battery charging commences only after the AAT3608 bat-
voltage reaches the charge voltage regulation point.
tery charger checks several conditions in order to main-
VBAT_REG is factory programmed to 4.2V (nominal).
Charging in constant-voltage mode will continue until the
charge current has reduced to the charge termination
current threshold. After the charge cycle is complete, the
battery charger turns off the series pass device and
automatically goes into a power saving sleep mode.
During this time, the series pass device will block current
in both directions to prevent the battery from discharg-
ing through the battery charger.
tain a safe charging environment. When an adapter input
is connected to PWR_IN and is greater than 4.5V, the
ENCHG bit is set (default) and the PWR_HOLD signal is
high, the charger is enabled. The charger can be disabled
by clearing the ENCHG bit through the I2C interface.
Figure 1 illustrates the entire battery charging profile or
operation, which consists of three phases:
1. Preconditioning (Trickle) Charge
2. Constant Current Charge
3. Constant Voltage Charge
The battery charger will remain in sleep mode even if the
charger source is disconnected. It will come out of sleep
mode when either the battery terminal voltage drops
below the VRCH threshold, or the charging source is
removed and reconnected. In all cases, the battery char-
ger will monitor all parameters and resume charging in
the most appropriate mode.
During battery charging, the battery charger initially
checks the condition of the battery and determines which
charging mode to apply. If the battery voltage is below
VMIN, then the battery charger initiates trickle charge
mode and charges the battery at 12% of the programmed
constant-current magnitude. For example, if the pro-
grammed current (ISETA) is 500mA, then the trickle charge
current will be 60mA. Trickle charge is a safety precau-
tion for a deeply discharged cell. It is intended to reduce
stress on the battery, but also reduces the power dissipa-
tion in the internal series pass MOSFET when the input-
output voltage differential is at its highest.
Battery Temperature Fault Monitoring
The TS pin is available to monitor the battery tempera-
ture. Connect a 10k NTC resistor from the TS pin to
ground. The TS pin outputs a 75ꢀA constant current into
the resistor and monitors the voltage to ensure that the
battery temperature does not fall outside the operating
limits depending on the temperature coefficient of the
resistor used. When the voltage goes above 2.39V or
goes below 0.331V, the charging will be suspended. A
Beta range of 3300 to 4000 will place the typical charg-
ing temperature between -4°C and 48°C.
Trickle charge continues until the battery voltage reach-
es 2.8V. At this point the battery charger begins con-
stant-current charging. The current level for this mode is
programmed using a resistor from the ISETA pin to
ground, or can be selected through the USBSEL pin with
Preconditioning
Constant Current (CC)
Trickle Charge
Charge Phase
Phase
Constant Voltage
Charge Phase
Battery Discharge
(CC)
Constant Voltage
Charge Phase
Charge Complete Voltage
Battery Recharge
Voltage Threshold
ICH_CC
Regulated Current
Constant Current Mode
Voltage Threshold (VMIN
)
ICH_PRE
Trickle Charge and
Termination Threshold
Figure 1: Current vs. Voltage Profile During Charging Phases.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Battery Charging Flowchart
Enable
Yes
Power on Reset
No
No
Power Input
Voltage
VIN > VUVLO
Enable
Yes
Fault
Conditions
Monitoring
OV, OT,
TS < VTS1
TS > VTS2
Expired
Charge Timer
Control
Shut Down
Yes
No
Yes
Preconditioning
Trickle Charge
VBAT < VMIN
Thermal Loop
Current
No
Reduction in
C.C. Mode
No
Yes
Recharge Test
VBAT < VRCH
Constant Current
VBAT < VBAT_EOC
Yes
No
No
Device Thermal
Loop Monitor
TJ > 115 C
Yes
Constant
Voltage
IBAT > ITERM
No
Charge Completed
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3608.2010.08.1.3
27
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
below the level where the converter can regulate the
Buck Regulators
output, the high side P-channel MOSFET is enabled con-
The AAT3608 step-down converters are peak current
tinuously for 100% duty cycle. At 100% duty cycle the
mode PWM converters operating at 1.5MHz frequency.
output voltage tracks the input voltage minus the I*R
The input voltage range is 2.7V to 5.5V. The converters
drop of the high side P-channel MOSFET.
provide internal compensation. Power devices are sized
For overload conditions, the peak input current is limit-
ed. The bucks use a cycle-by-cycle current limit to pro-
tect itself and the load from an external fault condition.
Thermal protection completely disables switching when
internal dissipation becomes excessive. The junction
over-temperature threshold is 140°C with 15°C of hys-
teresis. Once an over-temperature or over-current fault
conditions is removed, the output voltage automatically
recovers.
for 800mA output current while maintaining over 85%
efficiency at full load. Peak efficiency is above 90%. Light
load efficiency is maintained at greater than 80% down
to 85% of full load current. Soft start limits the current
surge seen at the input and eliminates output voltage
overshoot.
The input pin, INBUCK (Pin 24) must be connected to the
SYSOUT output pin. The Buck1 output voltage is adjust-
able from 0.6V to 5.5V and is programmed through an
external resistor divider. Buck2 output default value is
set by external resistor feedback and then the feedback
voltage can be dynamically adjusted via I2C in 12.5mV
increments from 0.5V to 0.7V.
Low-Dropout Regulators
The advanced circuit design of the linear regulators has
been specifically optimized for very fast start-up and
shutdown timing. These proprietary LDOs are tailored for
superior transient response characteristics. These traits
are particularly important for applications which require
fast power supply timing.
For overload conditions, the peak input current is limit-
ed. Also, thermal protection completely disables switch-
ing if internal dissipation becomes excessive, thus pro-
tecting the device from damage. The junction over-
temperature threshold is 140°C with 15°C of hysteresis.
Under-voltage lockout (UVLO) guarantees sufficient VIN
bias and proper operation of all internal circuits prior to
activation.
The high-speed turn-on capability is enabled through the
implementation of a fast start control circuit, which
accelerates the power up behavior of fundamental con-
trol and feedback circuits within the LDO regulator. For
fast turn-off time response is achieved by an active out-
put pull down circuit, which is enabled when the LDO
regulator is placed in the shutdown mode. This active
fast shutdown circuit has no adverse effect on normal
device operation.
The current through the P-channel MOSFET (high side)
is sensed for current loop control, as well as short circuit
and overload protection. A fixed slope compensation sig-
nal is added to the sensed current to maintain stability
for duty cycles greater than 50%. The peak current
mode loop appears as a voltage-programmed current
source in parallel with the output capacitor. The output
of the voltage error amplifier programs the current mode
loop for the necessary peak switch current to force a
constant output voltage for all load and line conditions.
Internal loop compensation terminates the transconduc-
tance voltage error amplifier output. The reference volt-
age is internally set to program the converter output
voltage greater than or equal to 0.6V.
There are two LDO input pins, INLDO (pins 6 and 9),
which must be connected to the SYSOUT output pin.The
LDO1 output voltage is selectable using pins S1 and S2
as shown in Table 1. LDO2 is fixed at 1.2V, LDO4 is fixed
at 2.5V and LDO5 is fixed at 3.3V. LDO3 output default
value is 1.2V and then can be dynamically adjusted via
I2C in 25mV increments from 1.0V to 1.4V.
S1
S2
LDO1
0
0
1
1
0
1
0
1
3.0V
3.3V
2.8V
For conditions where the input voltage drops to the out-
put voltage level, the converter duty cycle increases to
100%. As the converter approaches the 100% duty
cycle, the minimum off-time initially forces the high side
on-time to exceed the 1.5MHz clock cycle and reduces
the effective switching frequency. Once the input drops
Reserved
Table 1: LDO1 Output Voltages.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Deep Sleep Mode
Controlling the System Outputs
“Deep Sleep Mode” is both an SOC and PMU-defined
mode where all regulators have been turned off except
for SYSOUT and Buck1. Data is backed up by the SOC
and Buck1 stays alive to maintain the memory. LDO4
and LDO5 would be turned off separately by I2C, but the
DS_RDY and PWR_DS I2C bits are used to get into and
out of Deep Sleep Mode. See the flowchart diagrams for
more detail.
The AAT3608 has a specific startup and shutdown condi-
tions depending on its mode of operation.
Shutdown Mode
“Shutdown Mode” is defined as the mode where the
entire PMU (Power Management Unit) is shut down. This
is a state that normally happens after all power has been
disconnected from PWR_IN and BAT. Typically, after
power has been applied and the part has been turned
on, it will normally never need to be turned off. For GPS
applications, the amount of time required for the SOC to
start up from shutdown is prohibitively long, so the only
time that it will go into Shutdown Mode (from any other
mode) is when PWR_IN is disconnected and the BAT is
below the Low-Battery comparator threshold.
PWR_ID Pin
The PWR_ID pin is an input logic pin which determines
the current limits and fast charge currents that will be
used by PMU. PWR_ID settings are listed in Table 2.
Timing Sequences
The AAT3608 has a specific startup sequence when the
device is activated. See the timing diagrams in Figures 2
through 7.
Normal Mode
“Normal Mode” is defined as the mode where all regula-
tors are active. Once the part is in Normal Mode, it will
typically go into Sleep or Deep-Sleep Mode when trying
to save current.
RESET
The RESET pin is an open drain active low output signal
for system reset. Connect a pull-up resistor from the
RESET pin to SYSOUT pin with a recommended resis-
tance value of 100kΩ. After Buck2 and LDO2 reach their
target nominal output voltage, a delay of 200ms exists
before RESET goes high; refer to the timing diagram in
Figure 2.
SOC Sleep Mode
“Sleep Mode” is an SOC-defined mode which simply
means that all regulators are shut down except SYSOUT,
Buck1, LDO1, and LDO3. To get into this mode from
Normal, the SOC will pull the PWR_EN pin low to turn off
LDO2, LDO4, and LDO5. Buck2 can also be controlled by
PWR_EN only if the SOC masks PWR_EN through I2C.
From a PMU point of view, it is no different from Normal
Mode except for the regulators that have been switched
off by pulling PWR_EN low.
PWR_IN – SYSOUT
Switch Current Limit
PWR_ID Pin
USBSEL Pin
Battery Fast Charge Current
L
L
H
L
H
X
100mA (typical)
500mA (typical)
Up to 1.2A (typical)
100mA (typical)
500mA (typical)
Set by the resistor at the ISETA pin.
Table 2: PWR_ID Settings.
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3608.2010.08.1.3
29
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Power off sequence
Sleep Mode
Wake up sequence
Normal Mode
Power on sequence
Normal Mode
SYSOUT
SYSOUT
LDO3
BUCK2
LDO1
BUCK1
PWR_ EN
disabled
PWR_ EN
asserted
PWR_EN pin
LDO2
Triggered by
PWR_EN
LDO4
LDO5
RESET pin
1ms
200ms
Figure 2: Normal Ù Sleep Mode Sequence.
The user pushes and releases the button to go into Sleep Mod.e
The user pushes and releases the pushbutton again to go back to Normal Mod. e
PBSTAS
X_PWR_EN
PWR_HOLD
GPIO
PWR_ON
2u
320ms
Debounce
The PMU
regulators
only react to
the PWR_EN
pin.
PWR_EN
BUCK2
LDO2
LDO4 &
LDO5
PWR_HOLD
AAT3608
PMU
SOC
Figure 3: Normal Ù Sleep Mode Block Diagram.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Power off
sequence
Wake up
sequence
Power on sequence
Normal Mode
Deep-sleep Mode
Normal Mode
SYSOUT
LDO3
BUCK2
LDO1
LDO2
BUCK1
LDO4
LDO5
LDO5 (VDDA3V3_USB),
LDO4 (VDDA2V5_USB, VDDIO_TSC,
VDDA_TSC, VREF_ADC)
X_RESET_B
T1
T2
T2
Notes 1: T1 at least 650µS for internal LVR setup time; T2 is about 2ms to wait until PLL is stable; other time interval is dependent on power stability.
Notes 2: After wake-up sequence from Deep-sleep Mode, the power on sequence to Normal Mode is similar to when powering on initially.
Figure 4: Normal Ù Deep-Sleep Mode Sequence.
Deep-Sleep
SOC sets PWR_DS bit through I2C.
Ready
When Deep-Sleep is
triggered (by the pushbutton)
DS_RDY = 1
PWR_DS = 0
PMU sees that PWR_DS has been set
so then PMU disables regulators Buck2,
LDO1, LDO2, LDO3, LDO4,and LDO5
simultaneously.
-SOC will back up all data
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 off
LDO5 off
-SOC will turn off LDO4 and
LDO5 using I2C
Each Buck output is at High-Z, but all
LDOs will be pulled to GND.
-SOC will set DS_RDY bit
using I2C
Deep-Sleep
Mode
DS_RDY = 1
PWR_DS = 1
Normal Mode
SYSOUT on
Charger on
LB comp on
DS_RDY = 0
PWR_DS = 0
Buck1 on
Buck2 off
LDO1 off
LDO2 off
LDO3 off
LDO4 off
LDO5 off
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 on
LDO5 on
SOC reads I2C
DS_RDY bit from
PMU.
SYSOUT on
Charger on
LB comp on
DS_RDY = 1
PWR_DS = 0
SOC first sets
DS_RDY bit to 0
and then retrieves
memory.
SYSOUT on
Charger on
LB comp on
Buck1 on
Buck2 on
LDO1 on
LDO2 off
LDO3 on
LDO4 off
LDO5 off
User presses pushbutton
connected to PWR_ON (or
EXT_ON) pin for > 320ms
(PWR_ON = H).
SOC will pull up the
PWR_EN pin to turn
on LDO2, LDO4, and
LDO5 simultaneously.
When LDO3 AND
Buck2 reach 90%
regulation, the PMU
will turn on LDO1.
PMU looks at PWR_DS bit.
Because PWR_DS=1,PMU
will begin Startup sequence
starting with LDO3 and
Buck2.
SYSOUT on
Charger on
LB comp on
PMU will force PWR_DS to 0.
Figure 5: Normal Mode Î Deep-Sleep Mode Î Normal Mode Flowchart.
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3608.2010.08.1.3
31
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Normal Mode
Sleep Mode
If a trigger event occurs, SOC pulls
down PWR_EN which turns off Buck2,
LDO2, LDO4, and LDO5 simultaneously.
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 on
LDO5 on
Buck1 on
Buck2 off
LDO1 on
LDO2 off
LDO3 on
LDO4 off
LDO5 off
If a trigger event occurs, PWR_EN
is asserted to turn on Buck2, LDO2,
LDO4, and LDO5 simultaneously.
SYSOUT on
Charger on
LB comp on
SYSOUT on
Charger on
LB comp on
Figure 6: Normal Mode Ù Sleep Mode Flowchart.
Shutdown
DS_RDY = 0
PWR_DS = 0
Startup
DS_RDY = 0
PWR_DS = 0
PWR_HOLD
is maintained high
Buck1 off
Buck2 off
LDO1 off
LDO2 off
LDO3 off
LDO4 off
LDO5 off
Buck1 on
Buck2 on
LDO1 on
LDO2 off
LDO3 on
LDO4 off
LDO5 off
User presses
pushbutton
connected to
PWR_ON pin
for >320ms.
When LDO3
AND Buck2
reach 90%
regulation, PMU
will turn on
LDO1 and
PMU begins
Startup sequence
starting with LDO3
and Buck2
SYSOUT off
Charger off
LB comp off
(PWR_ON = H)
Buck1
SYSOUT on
Charger on
LB comp on
If ADP and USB are
removed and the BAT
pin is < Low-Battery
threshold, the PMU will
automatically go back
into Shutdown mode.
Normal Mode
DS_RDY= 0
PWR_DS= 0
SOC will pull up
PWR_EN pin to
turn on LDO2,
LDO4, and LDO5
simultaneously.
RESET is pulled high
Buck1 on
Buck2 on
LDO1 on
LDO2 on
LDO3 on
LDO4 on
LDO5 on
All Regulators will be
turned off simultaneously.
All bucks will be in
Hi-Z mode.
All LDOs will pull
down their outputs.
SYSOUT on
Charger on
LB comp on
Figure 7: System Shutdown Ù Normal Mode (Initial Start-Up) Flowchart.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
I2C Serial Interface and Programmability
MSB
LSB
R/W
Serial Interface
Many of the features of the AAT3608 can be controlled
via the I2C serial interface. The I2C serial interface is a
widely used interface where it requires a master to initi-
ate all the communications with the slave devices. The
I2C protocol consists of 2 active wires, SDA (serial data
line) and SCL (serial clock line). Both wires are open
drain and require an external pull up resistor to VCC
(SYSOUT may be used as VCC). The SDA pin serves I/O
function, and the SCL pin controls and references the I2C
bus. I2C protocol is a bidirectional bus which allows both
read and write actions to take place. The timing diagram
in Figure 8 depicts the transmission protocol.
Figure 8: Bit Order.
Acknowledge Bit
The acknowledge bit is the ninth bit of data. It is used to
send back a confirmation to the master that the data has
been received properly. For acknowledge to take place,
the MASTER must first release the SDA line, then the
SLAVE will pull the data line low as shown in Figure 9.
The address is embedded in the first seven bits of the
byte. The eighth bit is reserved for the direction of the
information flow for the next byte of information. For the
AAT3608, this bit must be set to “0” when writing and
“1” when reading. The full 8-bit address including the
R/W bit is 0x9C (hex) or 10011100 in binary for writing
and 0x9D(hex) or 10011101 in binary for reading.
START and STOP Conditions
START and STOP conditions are always generated by the
master. Prior to initiating a START condition, both the SDA
and SCL pin are idle mode (idle mode is when there is no
activity on the bus and SDA and SCL are pulled to VCC via
external resistor). As depicted in Figure 9, a START condi-
tion is defined to be when the master pulls the SDA line
low and after a short period pulls the SCL line low. A
START condition acts as a signal to all ICs that something
is about to be transmitted on the BUS. A STOP condition,
also shown in Figure 9, is when the master releases the
bus and SCL changes from low to high followed by SDA
low to high transition. The master does not issue an
ACKNOWLEDGE and releases the SCL and SDA pins.
I2C Write Code
After sending the chip address, the master should
send an 8-bit data stream (“2ND Word”). The “2ND Word”
can consist of any one of the four sets of data listed in
Table 3.
The “3RD Word” should be entered into the I2C only if
(Bit7,Bit6,Bit5) = (0,0,0) in the “2ND Word”. In this case,
the bits (G2,G1,G0) are used to set the bit assignments
as shown in Tables 4 and 5.
Transferring Data
Every byte on the bus must be 8 bits long. A byte is
always sent with the most significant bit first (see Figure
8).
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33
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
I2C Address
2nd Word
3rd Word
R/W ACK
9
0
ACK
ACK
18
27
G2:0=3'b000
START
E15 E14 E1 3 E12 E1 1 E10
STOP
STOP
A6 A5 A4 A3 A2 A1
0
0
0
0
0
0
0
1
1
0
1
0
1
x
x G2 G1 G0
0
1
1
1
0
1
E25 E24 E2 3 E22 E2 1 E20
E35 E34 E3 3 E32 E3 1 E30
D14 D13 D12 D11 D10
D24 D23 D22 D21 D20
D34 D33 D32 D31 D30
STOP
STOP
G2:0=3'b010
0
1
F15 F14 F13 F12 F11 F10
STOP
SCL
SDA
A6
A5
A0
W
A
0
01or 10 or 11 Dx4
Dx0
A
START command
from the master.
Write command Acknowledge
from the maste.r from the slave.
Acknowledge
from the slave.
STOP command
from the master.
START
STOP
D1<4:0>
D2<4:0>
D3<4:0>
E1<5:0>
E2<5:0>
E3<5:0>
SCL
SDA
Data Data Data
Data
F1<5:0>
A<6:0>
I2C Controller
Figure 9: I2C Protocol.
Bit7 Bit6 Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
0
0
0
0
0
1
1
0
1
0
1
0
0
G2
DS_RDY
LDO41
G1
PWR_DS
LDO40
G0
Reserved
ENCHG
ENLDO5
LDO51
ENLDO4
LDO50
BUCK24 and LDO34 BUCK23 and LDO33
BUCK22 and LDO32
BUCK21 and LDO31 BUCK20 and LDO30
Table 3: I2C “2nd Word” Bit Assignments.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
1
1
0
ENLDO3
PWR_IN IN Mask
ENLDO2
PWR_IN OUT Mask
ENLDO1
Reserved
ENBUCK1
LBO Mask
ENBUCK2
TIME OUT Mask
PWR_EN Mask
CHG DONE Mask
Table 4: I2C “3rd Word” Bit Assignments for (G2,G1,G0) = (0,0,0)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
1
Test Modes
Table 5: I2C “3rd Word” Bit Assignments for (G2,G1,G0) = (0,1,0).
BUCK24
LDO34
BUCK23
LDO33
BUCK22
LDO32
BUCK21
LDO31
BUCK20
LDO30
LDO3 Output Voltage
BUCK2 FB Voltage
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
X
1.000V
1.025V
1.050V
1.075V
1.100V
1.125V
1.150V
1.175V
0.5000V
0.5125V
0.5250V
0.5375V
0.5500V
0.5625V
0.5750V
0.5875V
1.200V (Default)
1.225V
0.6000V (Default)
0.6125V
1.250V
1.275V
1.300V
1.325V
1.350V
1.375V
1.400V
0.6250V
0.6375V
0.6500V
0.6625V
0.6750V
0.6875V
0.7000V
Table 6: Buck2 and LDO3 Output Voltage.
LDO41
LDO40
LDO4 Output Voltage
LDO51 LDO50
LDO5 Output Voltage
0
0
1
1
0
1
0
1
1.8V
2.5V (Default)
2.85V
0
0
1
1
0
1
0
1
1.2V
1.5V
3.0V
3.3V
3.3V (Default)
Table 7: LDO4 Output Voltage.
Table 8: LDO5 Output Voltage.
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3608.2010.08.1.3
35
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
ENCHG
Description
DS_RDY
Description
0
1
Turn off Battery Charger
Turn on Battery Charger (Default)
0
1
(Default)
Deep Sleep Recognition Flag
ENBUCK1
Description
PWR_DS
Description
0
1
Turn off Buck1
Turn on Buck1 (Default)
0
1
(Default)
Force PMU to go into Deep Sleep Mode
ENBUCK2
Description
PWR_EN Mask
Description
0
1
Turn OFF Buck2
Turn ON Buck2 (Default)
0
1
No Masking
Mask the PWR_EN pin ability to control BUCK2 (Default)
ENLDO1
Description
PWR_IN IN Mask
Description
0
Turn OFF LDO1
0
No Masking
Prevent an interrupt from being generated if the
PWR_IN IN bit has been asserted (Default)
1
Turn ON LDO1 (Default)
1
ENLDO2
Description
PWR_IN OUT Mask
Description
0
Turn OFF LDO2
0
No Masking
Turn ON LDO2 only if PWR_EN pin is
Prevent an interrupt from being generated if the
PWR_IN OUT bit has been asserted (Default)
1
1
High (Default)
ENLDO3
Description
LBO Mask
Description
0
Turn OFF LDO3
0
No Masking
Prevent an interrupt from being generated if the LBO
comparator has been asserted (Default)
1
Turn ON LDO3 (Default)
1
ENLDO4
Description
TIMEOUT Mask
Description
0
Turn OFF LDO4
0
No Masking
Prevents an interrupt from being generated if the
TIMEOUT bit has been asserted (Default)
1
Turn ON LDO4 (Default)
1
ENLDO5
Description
CHG_DONE Mask
Description
0
Turn OFF LDO5
0
No Masking
Prevent an interrupt from being generated if the charger
has reached End-of-Charge (Default)
1
Turn ON LDO5 (Default)
1
Table 9: Enable Settings.
Interrupt (Read from I2C)
The INT (interrupt) pin is an open drain output which
pulls low when there is an assertion in any one of the
status bits (except the DS_RDY and PWR_DS bits).
When a Read from the I2C is initiated AND completed by
the SOC, the INT pin is released and the voltage will go
high through the external pull-up resistor.
A single byte is used when reading I2C data from the
AAT3608. The R/W address should be set to 1 so that
complete address of the chip would be 0x9D or 10011101
in binary.
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
PWR_IN IN
PWR_IN OUT
Reserved
LBO
TIME OUT
CHG_DONE
DS_RDY
PWR_DS
Table 10: I2C Read Table.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Interrupt Signal
PWR_IN IN Bit
Description
Produced?
0
1
Default
Only if PWR_IN IN Mask
bit is not set
If VPWR_IN > UVLO threshold, this bit will be set
Interrupt Signal
Produced?
PWR_IN OUT Bit
Description
0
1
Default
Only if PWR_IN OUT
Mask bit is not set
If VPWR_IN < UVLO threshold, this bit will be set
Interrupt Signal
Produced?
TIMEOUT Bit
Description
0
1
Default
Only if TIMEOUT Mask
bit is not set
If the charger watchdog timer has reached Timeout, this bit will be set.
Interrupt Signal
Produced?
LBO Bit
Description
0
1
Default
Only if LBO Mask bit is
not set
If Low-Battery comparator is tripped then this bit will be set.
Interrupt Signal
Produced?
CHG DONE Bit
Description
0
1
Default
Only if CHG_DONE
Mask bit is not set
If the Charger has reached End-Of-Charge (EOC), this bit will be set
Interrupt Signal
Produced?
DS_RDY Bit
Description
0
1
Default
No INT signal
Same as the DS_RDY bit described in the "I2C Write" section of this datasheet
Interrupt Signal
Produced?
PWR_DS Bit
Description
0
1
Default
No INT signal
Same as the PWR_DS bit described in the "I2C Write" section of this datasheet
Table 11: Status Bit Descriptions.
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3608.2010.08.1.3
37
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Input Capacitor (Bucks)
Application Information
All input capacitors should be located as physically close
to the power pin (INBUCK) and power ground pins
(PGND1 and 2). Ceramic capacitors are recommended for
their higher current operation and small profile. Also,
ceramic capacitors are inherently capable to withstand
input current surges from low impedance sources such as
batteries in portable devices over tantalum capacitors.
Typically, 10V or 16V rated capacitors are required.
The two bucks are high performance 800mA 1.5MHz
monolithic step-down converters. They have been
designed with the goal of minimizing external compo-
nent size and optimizing efficiency over the complete
load range. Apart from the small bypass input capacitor,
only a small L-C filter is required at the output.
Both bucks can be programmed with external feedback
resistors to any voltage, ranging from 0.6V to the input
voltage in default feedback voltage condition.
The following are the typical recommended capacitance
values:
At dropout, the step down converters duty cycle increas-
es to 100% and the output voltage tracks the input volt-
age minus the RDSON drop of the P-channel high-side
MOSFET.
Two 10μF capacitors for INBUCK
One 10μF capacitor for INLDO
One 10μF capacitor for SYSOUT
One 10μF capacitor for PWR_IN
One 10μF capacitor for BAT
Output Voltage Resistor Selection
Resistors R2 through R5 in Figure 10 program the output
to regulate at a voltage higher than 0.6V in default
mode. The feedback voltage of Buck2 can have a wider
range and can be adjusted down to 0.5V through I2C. To
limit the bias current required for the external feedback
resistor string while maintaining good noise immunity, a
suggested value for R3 and R5 is 59kΩ to provide a bias
current of 10uA with a feedback voltage of 0.6V. Although
a larger value will further reduce quiescent current, it
will also increase the impedance of the feedback node,
making it more sensitive to external noise and interfer-
ence. Table 12 summarizes the resistor values for vari-
ous output voltages with R3 and R5 set to either 59kΩ
for good noise immunity or 100kΩ for reduced no load
input current.
Output Capacitor (Bucks)
For proper load voltage regulation and operational stabil-
ity, a capacitor is required on the output of each buck.
The output capacitor connection to the ground pin should
be made as directly as practically possible for maximum
device performance. Since the bucks have been designed
to function with very low ESR capacitors, a 4.7μF ceram-
ic capacitor is recommended for best performance.
Inductor Selection
The two bucks use peak current mode control with slope
compensation to maintain stability for duty cycles great-
er than 50%. The output inductor value must be selected
so the inductor current down slope meets the internal
slope compensation requirements. The internal slope
compensation is 1A/μs. The inductor should be set equal
to the output voltage numeric value in micro henries
(μH). This guarantees that there is sufficient internal
slope compensation.
VOUT
(V)
R3 and R5 = 59kΩ R3 and R5 = 100kΩ
R2 and R4 (kΩ)
R2 and R4 (kΩ)
0.8
0.9
1
19.6
29.4
39.2
49.9
59
68.1
78.7
88.7
118
124
137
187
267
33.2
49.9
66.5
82.5
100
118
133
150
200
210
232
316
453
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2
Inductor manufacturer’s specifications list both the
inductor DC current rating, which is a thermal limitation,
and the peak current rating, which is determined by the
saturation characteristics. The inductor should not show
any appreciable saturation under normal load conditions.
Some inductors may meet the peak and average current
ratings yet result in excessive losses due to a high DCR.
Always consider the losses associated with the DCR and
its effect on the total converter efficiency when selecting
an inductor.
2.5
3.3
Table 12: Feedback Resistors
(Feedback Voltage = 0.6V).
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Input Capacitor (LDOs)
Layout Guidance
Typically, a 10μF or larger capacitor, C4 (see Figure 10),
is recommended as close as possible to the device
INLDO pin. The input capacitor value of 10μF will offer
superior input line transient response and will assist in
maximizing the highest possible power supply ripple
rejection.
Figure 10 is the schematic for the evaluation board. The
evaluation board has extra components for easy evalua-
tion; the bill of materials for the system is shown in Table
12. When laying out the PC board, the following layout
guidelines should be followed to ensure proper operation
of the AAT3608:
There is no specific capacitor ESR requirement; there-
fore ceramic, tantalum, or aluminum electrolytic capaci-
tors may be selected for capacitor C4. However, ceramic
capacitors are recommended due to their inherent capa-
bility over tantalum capacitors to withstand input current
surges from low impedance sources such as batteries in
portable devices.
1. The exposed pad (EP) must be reliably soldered to
exposed copper pad on the board and electrically
connected to GND/PGND pins.
2. The power traces, including GND traces, the LX
traces and the VIN trace should be kept short, direct
and wide to allow large current flow. Use several via
pads when routing between layers.
3. The input capacitors should be connected as close as
possible from SYSOUT and INBUCK to PGND1 and
PGND2 to get good power filtering.
4. Keep the switching node LX away from the sensitive
buck feedback nodes, FB1 and FB2.
5. The feedback trace for the bucks should be separate
from any power trace and connected as closely as
possible to the load point. Sensing along a high cur-
rent load trace will degrade DC load regulation.
6. The output capacitors and inductors should be con-
nected as close as possible and there should not be
any signal lines under the inductor.
7. The resistance of the trace from the load return to
PGND1 and PGND2 should be kept to a minimum.
This will help to minimize any error in DC regulation
due to differences in the potential of the internal
signal ground and the power ground.
Output Capacitor (LDOs)
For proper load voltage regulation and operational stabil-
ity, a 4.7ꢀF ceramic capacitor is required between the
output of the LDOs and GND. If desired, the output
capacitor may be increased without limit. The output
capacitor connection to the LDO regulator ground pin
should be made as direct as practically possible for
maximum device performance.
Although the device is intended to operate with low ESR
capacitors, it is stable over a very wide range of capaci-
tor ESR, thus it will also work with higher ESR tantalum
or aluminum electrolytic capacitors. However, for best
performance, ceramic capacitors are recommended.
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3608.2010.08.1.3
39
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
J1
J2
VBAT
VIN
VBAT
VIN
C2
10µF
C3
10µF
C1
0.1µF
VIN
TB1
1
PGND
AAT3608
U1
2
PGND
39
38
29
28
J3
TB-2
PWR_IN PWR_IN BAT BAT
J4
SYSOUT
C6
10µF 10µF 10µF 10µF
PWR_ID
USBSEL
Buck 1
37
40
36
35
PWR_ID
SYSOUT
SYSOUT
BUCK1
PGND
VBAT
C4
C5
C7
USBSEL
SYSOUT
1 TB3
2
18
19
S2
S1
S2
S1
TB2
1
R2
316K
24
9
P6,9
P24
P24
P35,36
GND
J22
INBUCK
INLDO
INLDO
TB-2
C8
4.7µF
J5
2
EXT_ON
PWR_ON
34
33
EXT_ON
EXT_ON
6
PGND PGND2 PGND1 PGND
J26
TB-2
PWR_ON
PWR_HOLD
PWR_EN
PWR_HOLD 32
R3
100K
PGND
LX1
PWR_EN
20
PGND1
L1 2.2µH
25
27
30
31
SDA
SCL
LX1
FB1
SDA
SCL
PGND
FB = 0.6V
J6
3
TS
Buck 2
GND GND GND
J25 J24 J28 J29
TS
J27
1TB4
2
BUCK2
13 RESET
RESET
LX2
LX2
L2 2.2µH
12
PBSTAS
GND
J23
R4
100K
PBSTAS
23
21
TB-2
C10
4.7µF
14
1
INT
STAT
GND
INT
STAT
FB2
R5
100K
PGND
LDO1
LDO2
8
J8
J9
15
16
LDO1
LDO2
LDO3
LDO4
LDO5
LDO1
LDO2
LDO3
LDO4
LDO5
LBO
LBI
PGND2
LBO
LBI
5
Star Ground is the Exposed Pad:
Connect all Ground Planes at the
Exposed Pad
PGND
LDO3
J10
J11
J12
7
2
4
LDO4
C15
ISETA
10
LDO5
11
R6
1.24K
TC
GND
17
PGND1 PGND2
C13
4.7µF
C17
4.7µF
C12
0.1µF
26
22
4.7µF
VBAT
C16
4.7µF
C14
4.7µF
SW1
SYSOUT
PWR_ON
J7
PGND
PGND
PGND1 PGND2
1
3
2
PWR_ON
VBAT
3-PIN_JUMPER
J15
LBI
SYSOUT
PGND
J13
BUCK1
VBAT
J16
R14
100K
R15
2M
J14
TS
R13
10K
SYSOUT VBAT
J17
SYSOUT
S1
J19
1
INT
INT
LBI
TS
LBO
LBO
PWR_HOLD
2
PWR_EN
R12
10K
1
2
3
4
5
6
12
11
10
9
R16
1M
3
C9
100pF
PWR_ID
USBSEL
S2
VIO
3-PIN_JUMPER
SDA
8
S1
PGND
P1
PGND
R17
10K
R18
10K
7
PGND
PGND
1
3
5
7
9
2
4
SW DIP-6
J18
STAT
R7 R8 R9 R10 R11
1M 1M 1M 1M 1M
D1
6
PGND
SCL
SYSOUT
J20
R20
1M
SYSOUT
8
SYSOUT
J21
R21
100K
10
STAT
C18
100pF
C19
100pF
R19
1.5K
Header 5X2
PBSTAS
PBSTAS
xRESET
RESET
LED2
PGND
PGND
Figure 10: AAT3608 Evaluation Board Schematic.
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Figure 11: AAT3608 Evaluation Board Silk Screen Layer.
Figure 12: AAT3608 Evaluation Board Top Layer.
Figure 13: AAT3608 Evaluation Board
Mid Layer 1 (GND Plane).
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3608.2010.08.1.3
41
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Figure 14: AAT3608 Evaluation Board
Mid Layer 2 (SYSOUT).
Figure 15: AAT3608 Evaluation Board
Bottom Layer.
Description
Value
Quantity
Footprint
U1
Battery Charger PMU
1
TQFN55-40L
J1, J2, J3, J4, J5, J6, J8, J9,
J10, J11, J12, 13, J14,J15, J16,
J18, J20, J21, J22, J23, J24,
J25, J26, J27, J28, J29
Test Point
26
TP
Terminal Block Connector 2 Positions -
DigiKey 277-1273-ND
Switch Tact, SPST, 5mm - C&K Components
PTS645TL50 LFS
TB1, TB2, TB3, TB4
SW1
4
1
TBLOK2
SW-2
P1
Header, 5-Pin, Dual row
1X3 Header
DIP Switch, 6 Position, SPST
Inductor
1
3
1
2
1
6
1
2
6
3
4
1
1
1
5
1
7
HDR2X5
HDR1X3
DIP-12/SW
CDRH4D16
1206LED - duplicate
0805
J7, J17, J19
S1
L1, L2
D1
2.2ꢀH
Typical red, green, yellow, amber GaAs LED
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Ceramic Capacitor
Resistor
C2, C3, C4, C5,C6,C7
10ꢀF
4.7ꢀF
0.1ꢀF
4.7ꢀF
100pF
10K
C8
C1, C12
C10, C13, C14, C15, C16, C17
0805
0603
0603
0603
0603
0603
0603
0603
C9, C18, C19
R12, R13, R17, R18
R15
R19
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
2M
1.5K
316K
100K
1.24K
1M
R2
R3, R4, R5, R14, R21
R6
0603
0603
0603
R7, R8, R9, R10, R11, R16, R20
Table 12: AAT3608 Evaluation Board Bill of Materials (BOM).
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3608.2010.08.1.3
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2, 3
TQFN55-40
C8XYY
AAT3608IIC-1-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor
products that are in compliance with current RoHS standards, including the requirement that lead not
exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at
http://www.analogictech.com/aboutus/quality.php.
Package Information
TQFN55-404
Pin 1 Identification
Chamfer 0.300 x 45°
Pin 1 Dot
by Marking
0.380 ± 0.050
0.450 ± 0.050
5.000 ± 0.050
3.600 ± 0.050
Top View
Bottom View
0.750 ± 0.050
0.203 REF
+ 0.100
- 0.000
0.000
Side View
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
3. Available exclusively outside of the United States and its territories.
4. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing
process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.
w w w . a n a l o g i c t e c h . c o m
3608.2010.08.1.3
43
PRODUCT DATASHEET
AAT3608
TM
SystemPower Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface
Revision History
Date
Revision
Edits
1. edits to Typical Application drawing p.1.
2. edits to Thermal Information p.3.
3. edits to Buck Regulators p.27.
4. edits to Low-Dropout Regulators p.28.
5. edits to Acknowledge Bit p.32
3. edits to Table 6 p.34.
5/5/2010
3608.2010.04.1.1
4. edits to Table 10 p.35.
5. edits to Fig.10 p.38.
6. edits to Table 12 p.40.
7. edits to Ordering Information p.41.
1. Edits to General Description, Features, and Application sections p.1.
2. edits to Typical Application drawing p.2.
3. edits to pin description table p.3
4. edits to Thermal Information p.4.
5. Edits to Electrical Characteristics p.5.
6. edits to curves p.8-22.
7. edits to Block Diagram p.24.
8. edits to SYSOUT p.25-26.
9. Battery Temperature Fault Monitoring title added p.26.
10. flowchart replaced p.27.
11. edits to Buck Regulators p.28.
3608.2010.07.1.2 12. edits to Low-Dropout Regulators p.29.
13. Figs. 2-3 replaced p.30.
7/15/2010
14. edits to Fig.7 p.31.
15. edits to Fig.7 p.32.
16. edits to Acknowledge Bit p.34
17. Fig.9 replaced p.34.
18. edits to Table 6 p.35.
19. edits to Table 10 p.36.
20. sections added to Application Information p.38.
21. edits to Table 12 p.38.
22. edits to Fig.10 p.40.
23. edits to Ordering Information p.43.
8/24/2010
3608.2010.08.1.3
1. Add footnote 3 p.43.
Advanced Analogic Technologies, Inc.
3230 Scott Boulevard, Santa Clara, CA 95054
Phone (408) 737-4600
Fax (408) 737-4611
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual
property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and
conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate
design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to
support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other
brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
w w w . a n a l o g i c t e c h . c o m
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3608.2010.08.1.3
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