AAT3607INJ-T1 [SKYWORKS]
Power Supply Support Circuit, Adjustable, 6 Channel, TDFN-28;
| 型号： | AAT3607INJ-T1 |
| 厂家： | 
SKYWORKS SOLUTIONS INC. |
| 描述： | Power Supply Support Circuit, Adjustable, 6 Channel, TDFN-28 |
| 文件： | 总26页 (文件大小：3162K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DATA SHEET
AAT3607: PMU with OVP Dynamic Li-ion Charger
Applications
Description
Cellular phones
Digital cameras
Handheld instruments
MP3 and MP4
PDAs and handheld computers
Portable GPS devices
The AAT3607 is a member of the Skyworks Total Power
Management IC (TPMICTM) product family that functions as a
highly integrated power management unit (PMU) for MP3/MP4
players and other handheld applications. It integrates a single-cell
Lithium Ion/Polymer battery dynamic charger module powered
from an AC/DC adapter or USB port, three 120° phase shifted
synchronous 1.6 MHz DC-DC step-down converters and two LDOs
for the system.
The typical input power source for the AAT3607 is a single-cell
Li-ion battery. The charger can be powered from either a current-
limited USB port or an AC/DC adapter, with charge current
programmed by two separate external resistors and selected by a
logic input pin. With the device’s dynamic charging feature, a
system connected to the AAT3607 can draw power from the
power supply without a battery, or charge the battery with the
power left over from the system. If the power supply has limited
current capability, the system draws power from both the limited
power supply source and the battery.
Features
VIN operating range: 4.1 V to 5.5 V
Over-voltage input protection
Functional without battery connected
Dynamic Li-ion charger:
Charge enable control
Two programmable/selectable charging currents up to 1 A
Programmable end of charge current
Charge current reduction
Thermal loop charge reduction
Reverse blocking
Three 1.6 MHz synchronous programmable step-down
The battery charger is a complete constant current/constant
voltage linear charger. It offers an integrated pass device, reverse
blocking protection, high accuracy current and voltage regulation,
charge status, and charge termination. The charging current is
programmable by means of an external resistor up to 1 A.
converters:
120 switching phase shift
Three independent enable controls
Buck 1: 400 mA
Buck 2: 300 mA
Buck 3: 300 mA
Two programmable and separate enable LDOs:
LDO1: 150 mA
LDO2: 150 mA
Fault protection scheme:
Under-voltage lockout (UVLO)
The AAT3607 also includes over-voltage input protection (OVP),
under-voltage lockout (UVLO), and over-temperature protection
(OTP) to protect the PMU under fault conditions.
The three integrated step-down converters operate under
synchronous PWM control with a 1.6 MHz switching frequency
and internal compensation, decreasing both size and quantity of
external components. The phase shift feature allows ripple
cancellation between the three converters when all are running
with nominal load.
Over-temperature protection (OTP)
Fast turn-on time
The AAT3607 is available in a thermally enhanced 28-pin 4 mm
4 mm TQFN package with exposed pad.
Built-in soft-start and power on reset
Low standby current
Thermally enhanced TQFN (28-pin, 4 mm 4 mm) package
A typical application circuit is shown in Figure 1. The pin
configurations are shown in Figure 2. Signal pin assignments
descriptions are provided in Table 1.
(MSL1, 260 ºC per JEDEC J-STD-020)
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30 2014
1
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
1 kΩ
1 μF
ADP/USB
BAT
VIN
10 μF
SYS
SYS
CHG
IR1
R
SET1
SET0
10 μF
PB
PGND
ENB1
BAT
R
IR0
En Buck 1
2.2 μH
Current Select
Charger Enable
ISEL
CEN
ITERM
LO1
LFB1
400 mA
4.7 μF
BO1
BO2
BO3
LX1
BFB1
ENB2
R
TERM
AAT3607
En Buck 2
2.2 μH
LO1
150 mA
300 mA
4.7 μF
2.2 μF
2.2 μF
LX2
BFB2
ENB3
LDO1 EN
LDO2 EN
ENL1
LO2
En Buck 3
2.2 μH
LO2
150 mA
300 mA
4.7 μF
LFB2
ENL2
LX3
BFB3
R
ESET
RST
AGND
tc339
Figure 1. AAT3607 Typical Application Circuit
28
27
26
25
24
23
22
1
2
3
4
5
6
7
21
20
19
18
17
16
15
ENB1
LFB1
LFB2
LO1
LO2
SYS
BAT
RST
ENB2
ENB3
CHG
LX1
PGND
LX2
8
9
10
11
12
13
14
tc340
Figure 2. AAT3607 Pinout – 28-Pin, 4 mm 4 mm TQFN
(Top View)
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2
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Table 1. AAT3607 Signal Descriptions
Pin Number
Name
ENB1
ENB2
ENB3
CHG
Description
Enable input for Buck 1 with 1 M internal pull down resistor.
1
2
Enable input for Buck 2 with 1 M internal pull down resistor.
Enable input for Buck 3 with 1 M internal pull down resistor.
Open drain charge status output. Active low to indicate the battery is charging.
Inductor switching node of Buck 1.
3
4
5
LX1
6
PGND
LX2
Power ground.
7
Inductor switching node of Buck 2.
8
LX3
Inductor switching node of Buck 3.
9
PB
Input power for Buck 1, 2, and 3. Connect to SYS with a bypass capacitor to ground.
Feedback pin for Buck 3; connect to a resistor divider for an adjustable output voltage.
Feedback pin for Buck 2; connect to a resistor divider for an adjustable output voltage.
Feedback pin for Buck 1; connect to a resistor divider for an adjustable output voltage.
Enable input for LDO 2 with 1 M internal pull-down resistor.
Enable input for LDO 1 with 1 M internal pull-down resistor.
10
11
12
13
14
BFB3
BFB2
BFB1
ENL2
ENL1
RST
Open drain reset output. Active low to indicate that BFB1, or BFB2, or BFB3 is below its regulation threshold after enable. RST goes
high 200 ms after the last enabled Buck reaches 80% of the regulation threshold. RST is high-impedance when ENB1, 2 and 3 are
low, and VIN is unconnected.
15
16
17
Positive battery terminal connection. Connect BAT to the positive terminal of a single-cell Li+/Li-Poly battery. Bypass BAT to GND
with a 1 F to 10 F ceramic capacitor.
BAT
SYS
System supply output. Bypass SYS to GND with a 10 F ceramic capacitor. If a valid voltage is present at VIN, and the system load
exceeds the input supply current limit to cause VIN drops below BAT, then both the external power source and the battery supplies
current to SYS. SYS is connected to BAT through an internal system load switch when a valid source is not present at VIN.
18
19
20
21
22
23
24
25
26
27
28
LO2
LO1
LFB2
LFB1
AGND
VIN
LDO 2 output with 5 k internal pull down resistor for fast turn off.
LDO 1 output with 5 k internal pull down resistor for fast turn off.
Feedback pin for LDO 2; connect to a resistor divider for an adjustable output voltage.
Feedback pin for LDO 1; connect to a resistor divider for an adjustable output voltage.
Analog ground.
DC power input from AC/DC adapters or USB input.
ISEL
IR1
Charge current setting selection input to select IR0 or IR1.
Charge current 1 programming resistor, selected by ISEL = 1.
Charge current 2 programming resistor, selected by ISEL = 0.
Connect a resistor between this pin and ground to set the end of charge termination current.
Battery charger enable pin, active high with 200 k internal pull down resistor.
Exposed pad. Connect to ground directly beneath the package.
IR0
ITERM
CEN
EP
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014
3
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Table 2, the recommended operating conditions are listed in
Table 3, and electrical specifications are provided in Table 4.
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT3607 are provided in
Table 2. AAT3607 Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Minimum
Maximum
7.5
Units
V
Maximum DC input voltage for VIN
Maximum rating
VIN_MAX
Power and logic pins
VIN + 0.3
85
V
Operating temperature range
Soldering temperature range
TJ
40
65
ºC
TS
150
ºC
Maximum soldering temperature (at leads, 10 sec.)
TLEAD
300
ºC
Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device.
Table 3. AAT3607 Recommended Operating Conditions
Parameter
Symbol
Value
49
Units
Thermal resistance
JA
JC
PD
ºC/W
ºC/W
W
Thermal resistance from junction to case
Maximum power dissipation
29
2.0
CAUTION: Although this device is designed to be as robust as possible, electrostatic discharge (ESD) can damage this device. This
device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or
equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Table 4. AAT3607 Electrical Specifications (1 of 2) (Note 1)
(VIN = 5 V, VBAT = 3.6 V, VSYS = VIN or VBAT, TA = –40 C to +85 C, Typical Values are TA = 25 C, Unless Otherwise Noted)
Parameter
Power Supply
Symbol
Test Condition
Min
Typical
Max
Units
Input over-voltage protection range
DC input operating voltage
VIN_OVPMAX
VIN
AC/DC adaptor connected
7.5
5.5
4.2
V
V
V
4.1
2.7
Battery input operating voltage
VBAT
Buck 1-3 and LDO 1/2 enable,
battery charger enabled, no load
Quiescent current
IQ
700
1000
A
Shutdown current
ISHDN
CEN; ENL1; ENL2; ENB1; ENB2; ENB3 = 0
VIN rising
1
A
V
Under-voltage lockout voltage
UVLO hysteresis
VUVLO
3.85
6.05
4
4.1
VUVLOHYS
VOVP
500
6.25
200
0.18
1000
mV
V
Over-voltage protection voltage
OVP hysteresis
VIN rising
6.45
OVPHYS
OVPRDSON
ILIM
mV
OVP switch on-resistance
Load switch current limit
900
1100
mA
Buck 1
Input voltage
VPB
VSYS
0.6
V
%
Output voltage accuracy
Output voltage range
Feedback voltage
VACC_BO1
VRG_BO1
VBFB1
IBO1 = 10 mA to 400 mA, VIN = 4.1 V to 5.5 V
3
0.6
3
VSYS 0.6
0.609
V
0.591
400
V
Maximum load current
Feedback leakage
P-channel current limit
High side switch on-resistance
Low side switch on-resistance
Load regulation
IBO1_MAX
IBO1FBL
mA
A
mA
m
m
%
IBO1FB = 0.6 V
0.2
IBO1LIMP
RBO1(DSON)_P
RBO1(DSON)_N
ΔVBO1/VBO1
ΔVLBO1/ΔVBO1
fOSCB1
800
300
200
1
ILOADB1 = 10 mA to 400 mA
Line regulation
VIN = 4.1 V to 5.5 V, ILOADB1 = 400 mA
0.3
1.6
120
%/V
MHz
s
A
mA
V
Oscillator frequency
Start-up time
tSB1
From enable to output regulation
VSYS = VFBB1 = 5.0 V
Input low current
IENB1
10
10
RST pin sink current
RST pin low voltage
IRST
8
VRST_LOW
IRST = 4 mA
0.4
Buck 2 and Buck 3
Input voltage
VPB
VSYS
0.6
Output voltage accuracy
Output voltage range
Feedback voltage
VACC_BO2,3
VRG_BO2,3
VBFB2,3
IBO2,3 = 10 mA to 300 mA
3
0.6
3
%
V
VSYS 0.6
0.609
0.591
300
V
Maximum load current
Feedback leakage
IBO2,3_MAX
IBO2,3FBL
mA
A
mA
m
m
VBO2,3FB = 0.6 V
0.2
P-channel current limit
High-side switch on-resistance
Low-side switch on-resistance
IBO2,3LIM_P
RBO2,3DSON_P
RBO2,3DSON_N
600
300
200
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5
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Table 4. AAT3607 Electrical Specifications (2 of 2) (Note 1)
(VIN = 5 V, VBAT = 3.6 V, VSYS = VIN or VBAT, TA = –40 C to +85 C, Typical Values are TA = 25 C, Unless Otherwise Noted)
Parameter
Buck 2 and Buck 3
Symbol
Test Condition
Min
Typical
Max
Units
Load regulation
ΔVBO2,3/VBO2,3
ILOADB2,3 = 10 mA to 300 mA
1
%
VIN = 4.1 V to 5.5 V, ILOADB2,3 = 300 mA,
TA = 25 °C
Line regulation
ΔVLBO2,3/ΔVBO2,3
0.3
%/V
Oscillator frequency
Start-up time
fOSCB2,3
tSB2,3
1.6
MHz
s
From enable to output regulation
VSYS = VFBB2,3 = 5.0 V
120
Input low current
IENB2,3
10
10
A
Battery Charger
Output charger voltage regulation
Preconditioning voltage threshold
Preconditioning charge current
VBAT_REG
VMIN
0 °C TA +70 °C
4.158
2.4
4.2
2.6
10
4.242
2.8
V
V
ICH_PRE
%ICH_CC
Constant-current mode charge
current
ICH_CC
ISEL = 1, RSET1 =1.6 k, VBAT = 3.6 V
900
1000
1100
mA
Thermal loop regulation
Thermal loop entering threshold
Thermal loop exiting threshold
CHG pin sink current
TREG
90
110
85
8
°C
°C
°C
mA
V
TLOOP_IN
TLOOP_OUT
ICHG
CHG pin low voltage
VCHGL
0.4
0.6
Enable threshold low
VCENL
V
Enable threshold high
VCENH
1.4
V
LDO 1, 2
IOUT = 1 mA to 150 mA, TA = 25 °C
1.5
2.5
0.6
1.5
2.5
%
Output voltage accuracy
VACC_LO1,2
IOUT = 1 mA to 150 mA, TA = 40 °C to 85 °C
Output voltage range
Input voltage
VRG_LO1,2
VLDO1,2_IN
VDO
VSYS VDO2
V
V
VSYS
200
Dropout voltage (Note 2)
ILO1,2 = 150 mA
400
mV
ΔVLO1,2/VLO1,2
ΔVLDO1,2_IN
Line regulation
VSYS = VLO1,2 + 1 to 5.0 V
0.09
%/V
Output current
ILO1,2
ISC
VLO1,2 > 0.6 V
VLO1,2 < 0.4 V
150
mA
mA
Short circuit current
250
22
Output voltage temperature
coefficient
TLO1,2C
ppm/°C
Enable time delay
TENL1,2_DLY
VENL1,2_L
VENL1,2_H
15
μs
V
Enable threshold low
Enable threshold high
0.6
1.4
V
Thermal
Over-temperature shutdown
threshold
TSD
Warning thermal threshold
140
15
°C
°C
Over-temperature shutdown
hysteresis
THYS
Note 1: Performance is guaranteed only under the conditions listed in this table.
Note 2: VDO is defined as VIN – VOUT when VOUT is 98% of nominal.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Typical Performance Characteristics
(VIN = 5 V, VBAT = 3.6 V, VSYS = VIN or VBAT, TA = –40 C to +85 C, Typical Values are TA = 25 C, Unless Otherwise Noted)
1200
600
1000
800
600
400
200
0
500
400
300
200
100
0
R
R
R
SET = 1.6 kΩ
SET = 1.78 kΩ
SET = 2 kΩ
R
R
R
SET = 3.24 kΩ
SET = 3.56 kΩ
SET = 16 kΩ
V
V
V
IN = 4.5 V
IN = 5.0 V
IN = 5.5 V
R
SET = 32.4 kΩ
2.4
2.8
3.2
3.6
4.0
4.4
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
V
BAT (V)
Input Voltage VIN (V)
Figure 4. Charge Current vs Battery Voltage (RSET = 3.24 k)
Figure 3. Constant Current vs Input Voltage
4.3
4.25
4.2
3
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2
4.15
T
T
T
A
A
A
= 0 °C
= 25 °C
= 70 °C
4.1
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
Input Voltage VIN (V)
Input Voltage VIN (V)
Figure 6. Battery Voltage vs Input Voltage
Figure 5. Pre-Conditioning Threshold Voltage vs Input Voltage
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
100
90
80
70
60
3
2
VSYS = 4.2 V
VSYS = 4.5 V
VSYS = 5.0 V
VSYS = 5.5 V
VBAT = 3.7 V
VBAT = 4.2 V
1
0
50
40
30
20
10
0
VSYS = 4.2 V
VSYS = 4.5 V
VSYS = 5.0 V
VSYS = 5.5 V
VBAT = 3.6 V
VBAT = 4.2 V
-1
-2
-3
0
50
100
150
200
250
300
350
400
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 8. Buck 1 DC Regulation
Figure 7. Step-Down Buck Efficiency vs Output Current
(VOUT = 3.0 V, L = 2.2 H)
(VOUT = 3.0 V, L = 2.2 H)
1
0.5
0
100
90
80
70
60
50
V
V
V
BAT = 3.0 V
BAT = 3.6 V
BAT = 4.2 V
V
V
V
V
SYS = 4.2 V
SYS = 4.5 V
SYS = 5.0 V
SYS = 5.5 V
VSYS = 4.2 V
VSYS = 4.5 V
VSYS = 5.0 V
VSYS = 5.5 V
VBAT = 3.0 V
VBAT = 3.6 V
VBAT = 4.2 V
40
30
20
10
0
-0.5
-1
0
50
100
150
200
250
300
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 10. Buck 2 DC Regulation
Figure 9. Step-Down Buck Efficiency vs Output Current
(VOUT = 1.8 V, L = 2.2 H)
(VOUT = 1.8 V, L = 2.2 H)
1
0.5
0
100
90
80
70
60
VSYS = 4.2 V
VSYS = 4.5 V
VSYS = 5.0 V
VSYS = 5.5 V
VBAT = 3.0 V
VBAT = 3.6 V
VBAT = 4.2 V
-0.5
-1
50
40
30
20
10
0
V
V
V
BAT = 3.0 V
BAT = 3.6 V
BAT = 4.2 V
V
V
V
V
SYS = 4.2 V
SYS = 4.5 V
SYS = 5.0 V
SYS = 5.5 V
-1.5
-2
0
50
100
150
200
250
300
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Figure 12. Buck 3 DC Regulation
Figure 11. Step-Down Buck Efficiency vs Output Current
(VOUT = 1.2 V, L = 2.2 H)
(VOUT = 1.2 V, L = 2.2 H)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
1.80
1.75
1.70
1.65
1.60
1.55
1.50
T
T
T
A
A
A
= –40 °C
= 25 °C
= 85 °C
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
85
85
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
Input Voltage VIN (V)
Input Voltage VIN (V)
Figure 13. Quiescent Current vs Input Voltage
(Buck 1-3 and LDO 1/2 Enabled, No Load)
Figure 14 Frequency vs Input Voltage
1.80
1.75
1.70
1.65
1.60
1.55
1.50
V
EN
(2 V/div)
0
VOUT
(2 V/div)
IIN
0
(200 mA/div)
tc354
-40
-15
10
35
60
Time (40 μs/div)
Temperature (°C)
Figure 16. Buck 1 Soft Start
Figure 15. Switching Frequency vs Temperature
(VIN = 5.0 V)
(VIN = 5.0 V, VOUT = 3.0 V, IOUT = 400 mA)
2.0
1.5
2.0
1.5
1.0
1.0
0.5
0.5
0.0
0.0
-0.5
-1.0
-1.5
-0.5
-1.0
-1.5
-2.0
-2.0
-40
-15
10
35
60
85
-40
-15
10
35
60
Temperature (°C)
Temperature (°C)
Figure 18. Buck 2 Output Voltage Accuracy vs Temperature
(VIN = 5.0 V, VOUT = 1.8 V, IOUT = 300 mA)
Figure 17. Buck 1 Output Voltage Accuracy vs Temperature
(VIN = 5.0 V, VOUT = 3.0 V, IOUT = 400 mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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9
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
2.0
1.5
0.5
0.25
0
I
I
I
I
I
OUT = 10 mA
OUT = 100 mA
OUT = 200 mA
OUT = 300 mA
OUT = 400 mA
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-0.25
-0.5
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
-40
-15
10
35
60
85
Input Voltage VIN V)
Temperature (°C)
Figure 20. Buck 1 Line Regulation
(VOUT = 3.0 V)
Figure 19. Buck 3 Output Voltage Accuracy vs Temperature
(VIN = 5.0 V, VOUT = 1.2 V, IOUT = 300 mA)
0.5
0.25
0
0.5
IOUT = 10 mA
IOUT = 100 mA
IOUT = 200 mA
I
I
I
I
OUT = 10 mA
OUT = 100 mA
OUT = 200 mA
OUT = 300 mA
0.25
IOUT = 300 mA
0
-0.25
-0.5
-0.25
-0.5
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
Input Voltage VIN V)
Input Voltage VIN V)
Figure 22. Buck 1 Line Regulation
(VOUT = 1.2 V)
Figure 21. Buck 2 Line Regulation
(VOUT = 1.8 V)
I
INDUCTOR
IINDUCTOR
(200 mA/div)
(200 mA/div)
0
0
0
VLX
V
LX
(2 V/div)
(2 V/div)
OUT 0
V
V
OUT
(20 mV/div)
(AC Coupled)
(20 mV/div)
0
0
(AC Coupled)
tc361
tc362
Time (400 ns/div)
Time (400 ns/div)
Figure 23. Buck 1 Output Ripple
Figure 24. Buck 2 Output Ripple
(VIN = 5.0 V, VOUT = 3.0 V, COUT = 4.7 F, 400 mA Load)
(VIN = 5.0 V, VOUT = 1.8 V, COUT = 4.7 F, 300 mA Load)
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
I
INDUCTOR
(200 mA/div)
VOUT
0
(100 mV/div)
0
VLX
(2 V/div)
I
OUT
0
0
V
OUT
(100 mA/div)
(20 mV/div)
(AC Coupled)
0
tc364
tc363
Time (20 μs/div)
Time (400 ns/div)
Figure 26. Buck 1 Load Transient Response
(VIN = 5.0 V, VOUT = 3.0 V, 75 mA to 150 mA Load)
Figure 25. Buck 3 Output Ripple
(VIN = 5.0 V, VOUT = 1.2 V, COUT = 4.7 F, 300 mA Load)
V
OUT
VOUT
(50 mV/div)
0
0
(100 mV/div)
I
OUT
I
OUT
(100 mA/div)
(100 mA/div)
0
0
tc365
tc366
Time (20 μs/div)
Time (20 μs/div)
Figure 28. Buck 3 Load Transient Response
(VIN = 5.0 V, VOUT = 1.2 V, 75 mA to 200 mA Load)
Figure 27. Buck 2 Load Transient Response
(VIN = 5.0 V, VOUT = 1.8 V, 75 mA to 125 mA Load)
V
IN
V
IN
(2 V/div)
(2 V/div)
0
0
0
0
V
OUT
V
OUT
(100 mV/div)
(100 mV/div)
tc368
tc367
Time (40 μs/div)
Figure 30. Buck 2 Line Transient Response
(VIN = 4.1 V to 5.0 V, VOUT = 1.8 V, 300 mA Load)
Time (40 μs/div)
Figure 29. Buck 1 Line Transient Response
(VIN = 4.1 V to 5.0 V, VOUT = 3.0 V, 400 mA Load)
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11
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
0.3
0.2
VBAT = 3.0 V
VBAT = 3.6 V
VBAT = 4.2 V
VSYS = 4.2 V
VSYS = 4.5 V
VSYS = 5.0 V
VSYS = 5.5 V
V
IN
(2 V/div)
0.1
0.0
0
-0.1
-0.2
-0.3
V
OUT
(100 mV/div) 0
tc369
0
30
60
90
120
150
Output Current (mA)
Time (40 μs/div)
Figure 32. Load Regulation vs Output Current
Figure 31. Buck 3 Line Transient Response
(VIN = 4.1 V to 5.0 V, VOUT = 1.2 V, 300 mA Load)
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.0
1.5
1.0
0.5
0.0
I
I
I
I
I
OUT = 0 mA
-0.5
-1.0
-1.5
-2.0
OUT = 10 mA
OUT = 50 mA
OUT = 100 mA
OUT = 150 mA
2.8
2.85
2.9
2.95
3.0
3.05
3.1
3.15
3.2
-40
-15
10
35
60
85
Input Voltage VIN V)
Temperature (°C)
Figure 34. Dropout Characteristics vs Input Voltage
(VOUT = 2.8 V)
Figure 33. Output Voltage Accuracy vs. Temperature
(VIN = 5.0 V, VOUT = 2.8 V, IOUT = 150 mA)
1.2
1.1
1.0
0.9
0.8
70
60
50
40
30
20
10
0
0.7
ENH
ENL
0.6
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
0.1
1
10
100
Input Voltage VIN V)
Frequency (kHz)
Figure 36. Enable Threshold Voltage vs Input Voltage (LDO2)
Figure 35. PSRR vs Frequency
(VIN = 5.0 V, VRIPPLE = 500 mV, 10 mA Load)
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
0.5
0.30
0.25
0.20
0.15
0.10
0.05
0
IOUT = 10 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
0.4
0.3
0.2
0.1
0
TA = –40 °C
TA = 25 °C
TA = 85 °C
-40
-15
10
35
60
85
0
30
60
90
120
150
Temperature (°C)
Output Current (mA)
Figure 38. Dropout Voltage vs Temperature
Figure 37. Dropout Voltage vs Output Current
0.5
0.25
0
-0.25
-0.5
I
I
I
OUT = 50 mA
OUT = 100 mA
OUT = 150 mA
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
Input Voltage VIN V)
Figure 39. Line Regulation
(VOUT = 2.8 V)
V
IN
V
OUT
(2 V/div)
0
(50 mV/div)
0
0
I
OUT
V
OUT
(50 mA/div)
(100 mA/div)
0
tc379
tc378
Time (20 μs/div)
Time (40 μs/div)
Figure 41. Load Transient Response
(VIN = 5.0 V, VOUT = 2.8 V, 50 mA to 150 mA Load)
Figure 40. Line Transient Response
(VIN = 4.1 V to 5.0 V, VOUT = 1.8 V, 150 mA Load)
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13
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
VIN
BAT
CHG
OVP Circuit
OVP
Switch
SYS
ISEL
IR1
Charger Control Logic
CEN
VB
IR0
ITERM
LX1
BFB1
ENB1
BUCK1
LO1
ENL1
LFB1
LDO1
LDO2
PGND
AGND
LX2
BFB2
ENB2
BUCK2
BUCK3
ENL2
LO2
LFB2
LX3
RST
Reset
Function
BFB3
ENB3
tc380
Figure 42. AAT3607 Functional Block Diagram
exceeds the input current limit, supplemental current is taken
from the battery.
Functional Description
The AAT3607 is a complete power management solution. It
seamlessly integrates a battery charger with three step-down
converters and two low-dropout regulators to provide power
from a wall adapter, a USB port, or a single-cell Lithium
Ion/Polymer battery. Internal load switches allow the converters
to operate from the best available power source.
Figure 42 shows the functional block diagram for the AAT3607.
Battery Charger and SYS
The charger seamlessly distributes power between the current-
limited external input, the battery, and the system load. The
basic functions performed with the battery and external power
source are:
If only the battery is available, the voltage converters are
powered directly from the battery through a 100 m load
switch. The charger goes into sleep mode and draws less than
1 A quiescent current. If the system is connected to a wall
adapter, the voltage converters are powered directly from the
adapter through the Over-Voltage Protection (OVP) switch with
on-resistance of 180 m and the battery is disconnected from
the voltage converters’ inputs. This allows the system to
operate regardless of the charging state of the battery, or to
operate with no battery.
If the system load requirements are less than the input
current limit, the battery is charged with residual power from
the input source.
If the system load requirements exceed the input current limit,
the battery supplies supplemental current to the load through
the internal system load switch.
If the battery is connected and there is no external power
input, SYS is powered only from the battery.
The charger circuitry offers flexible power distribution from an
AC/DC adapter or a current-limited USB source to the battery
and system load. The battery is charged with any available
power not used by the system load. If a system load peak
If an external power input is connected and there is no
battery, the SYS is powered from the external power input.
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
A thermal-limiting circuit reduces the battery charge rate from
the external power source current to prevent the IC from
overheating.
Trickle charge mode continues until the battery voltage reaches
2.6 V. At this point the battery charger switches to constant
current charge mode. The current level for this mode is
programmed by the IR1 and IR0 pins using a resistor connected
from the pin to ground and selected by the ISET pin.
VIN is the power input pin that supplies the system (SYS) up to
1 A through an over-voltage protection switch. The battery
charge current level is selected with the ISEL input pin. The two
current levels are designed for use with AC/DC wall adapters
and current-limited USB power sources. The operating voltage
range for VIN is 4.1 V to 5.5 V.
Programmed current can be set from a minimum of 100 mA up
to a maximum of 1 A. Constant current charge mode continues
until the battery voltage reaches the voltage regulation point
VBAT_REG. When the battery voltage reaches the regulation
voltage (VBAT_REG), the battery charger transitions to constant
voltage mode. VBAT_REG is factory programmed to 4.2 V
(nominal). Charging in constant voltage mode continues until
the charge current has fallen to the end of charge termination
current. The charge termination current level is programmed by
the ITERM pin with a resistor connected to this pin to ground.
Floating this pin will result in the termination current set to 10%
of IR0 or IR1. Connecting this pin to ground will result in the
lowest termination current.
When the input voltage is below the under-voltage threshold or
below the battery voltage, it is considered to be invalid. The
power input is disconnected when the input voltage is invalid.
Battery Charger
Battery charging commences only after the AAT3607 battery
charger enable pin (CEN) is turned on and the charger circuits
check for several conditions in order to maintain a safe charging
environment. The input supply must be above the minimum
operating voltage (UVLO) and must be within specifications. The
OVP function ensures that only safe input voltages within
specifications are connected to the battery charger. Otherwise,
the unsafe input voltage is completely disconnected from the
battery charger terminals.
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
blocks current in both directions to prevent the battery from
discharging through the battery charger.
The battery charger remains in sleep mode even if the charger
source is disconnected. It comes out of sleep mode when either
the battery terminal voltage drops below the (VBAT_REG 0.1 V)
threshold or the charger CEN pin is recycled, or the charging
source is reconnected. In all cases, the battery charger monitors
all parameters and resumes charging in the most appropriate
mode. When no automatic charge reduction mode or digital
thermal loop is triggered, the charge profile is controlled as
shown in Figure 43. The AAT3607 also includes an integrated
reverse blocking function.
When the battery is connected to the BAT pin, the battery
charger checks the condition of the battery and determines
which charging mode to apply. If the battery voltage is below
VMIN, the battery charger initiates trickle charge mode and
charges the battery at 10% of the programmed constant-
current magnitude. For example, if the programmed current is
500 mA, the trickle charge current will be 50mA. Trickle charge
is a safety precaution for a deeply discharged cell and also
reduces the power dissipation in the internal series pass
MOSFET when the input-output voltage differential is at its
highest.
Battery Charge Current
Battery Voltage
Preconditioning
Trickle Charge
Phase
Constant Current (CC) Charge Phase
Constant Voltage (CV)
Charge Phase
Charge Complete Voltage
I = Max CC
Regulated Current
Charge Current
Battery Voltage
Constant Current Mode
Voltage Threshold
Termination Current
Set by RTERM
I = CC/10
Trickle Charge Current
tc381
Time
Figure 43. Charge Current vs. Battery Voltage Profile During Charging Phases
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15
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Thermal Loop Control
OVP Switch
The actual maximum charging current is a function of charge
adapter input voltage, the state of charge of the battery at the
moment of charge, the ambient temperature, and the thermal
impedance of the package. The maximum programmable
current may not be achievable under all operating parameters.
One issue to consider is the amount of current being provided to
the SYS from VIN and at the same time being provided as
charge current to the battery from VIN. A reduction in the
charge current is designed when the device temperature is too
high through the digital thermal loop of the charger.
In normal operation the OVP switch acts as a load switch,
connecting and disconnecting the power supply from VIN. A low
resistance MOSFET is used to minimize the voltage drop
between the voltage source and the charger and to reduce
power dissipation. When the voltage on the input exceeds the
6.25 V voltage limit, the device immediately turns off the
internal OVP switch, disconnecting the load from the abnormal
voltage and preventing damage to any downstream
components. If an over-voltage condition is applied when the
device is enabled, then the switch remains OFF.
To protect the linear charging IC from thermal problems, a
special thermal loop control system is used to maximize
charging current. The thermal management system measures
the internal circuit die temperature and reduces the fast charge
current when the die exceeds the preset internal temperature
control threshold. Once the thermal loop control becomes
active, the fast charge current is initially reduced by a factor of
0.44.
On initial power-up, if UVLO < VIN < 6.25 V, the OVP switch
turns on after an 180 s typical internal delay, if VIN < UVLO or
if VOVP > 6.25 V, the OVP switch is held off.
If VIN > 6.25 V, the OVP switch is held off. After VIN < (6.25 V
hysteresis), the OVP switch turns on after an 180 s typical
internal delay.
Synchronous Step-Down Converter
The initial thermal loop current can be estimated by the
following equation:
The AAT3607 contains two high-performance 300 mA and one
high-performance 400 mA, 1.6 MHz synchronous step-down
converters. The step-down converters operate to ensure high
efficiency performance over all load conditions. All three output
voltages are programmable by external resistor dividers to
feedback the output voltage and compare it to the internal 0.6 V
reference voltage.
ITLOOP ICC 0.44
The thermal loop control re-evaluates the circuit die
temperature every three seconds and raises the fast charge
current in small steps to the full fast charge current level.
Figure 44 illustrates the thermal loop function at 1 A fast charge
current as the ambient temperature increases and recovers. In
this manner the thermal loop controls the system charge level,
and the AAT3607 provides the highest level of constant current
in the fast charge mode for any possible valid ambient
temperature condition.
The input voltage range is from 4.1 V to 5.5 V, and the output
voltage is programmable. Power devices are sized for 300 mA
and 400 mA current capability while maintaining over 90%
efficiency at full load. High efficiency is maintained at lower
currents.
A high DC gain error amplifier with internal compensation
controls the output. It provides excellent transient response and
load/line regulation. Transient response time is typically less
than 20 s. The converter has soft start control to limit inrush
current.
1.2
1.0
0.8
Apart from the input capacitor, only a small L-C filter is required
at the output side for the step-down converters to operate
properly. Typically, a 2.2 H inductor or a 4.7 F ceramic
capacitor is recommended for low output voltage ripple and
small component size.
0.6
0.4
0.2
0
tc382
Time (10 s/div)
Figure 44. Digital Thermal Loop Function at 1 A Fast Charge
Current with Ambient Temperature Increasing and Recovering
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Control Loop
of the chip rises above the temperature shutdown threshold, the
AAT3607 is forced to turn off and restarts when the over-
temperature condition is removed.
The converter is a peak current mode step-down converter. The
inner, wide bandwidth loop controls the inductor peak current.
The inductor current is sensed through the P-channel MOSFET
(high side) and is also used for short-circuit and overload
protection. A fixed slope compensation signal 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
Worst case clock
Buck1
Buck2
Buck3
capacitor. The output of the voltage error amplifier programs
the current mode loop for the necessary peak inductor current
to force a constant output voltage for all load and line
conditions. The voltage feedback resistive divider is external
and the error amplifier reference voltage is 0.6 V. The voltage
loop has a high DC gain making for excellent DC load and line
regulation. The internal voltage loop compensation is located at
the output of the transconductance voltage error amplifier.
with built-in
Buck1
120º phase shift
Soft Start
Soft start increases the inductor current limit point linearly
when the input voltage or enable input is applied. It limits the
current surge seen at the input and eliminates output voltage
overshoot.
Buck2
Buck3
Active Discharge in Shutdown
tc383
All AAT3607 synchronous buck converters have an internal
1 k resistor that discharges the output capacitor when the
converter is off at LX node. The discharge resistors ensure that
the load circuitry powers down quickly and completely. The
internal discharge resistors are connected when a converter is
disabled and when the device is in UVLO with an input voltage
greater than 1.0 V. With an input voltage less than 1.0 V, the
internal discharge resistors are not activated.
Figure 45. Buck Converter Phase Shifting
Low Dropout Regulator
The advanced circuit design of the linear regulator has been
specifically optimized for very fast startup and shutdown timing.
This proprietary LDO has also been tailored for superior
transient response characteristics. These traits are particularly
important for applications that require fast power supply timing.
Synchronous Buck Converters Phase Shift
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 control and feedback
circuits within the LDO regulator. Fast turn-off time response is
achieved by an active output pull-down circuit, which is enabled
when the LDO regulator is placed in shutdown mode. This
active fast shutdown circuit has no adverse effect on normal
device operation. The LDO regulator output has been
specifically optimized to function with low cost, low ESR
ceramic capacitors. However, the design allows for operation
over a wide range of capacitor types.
Converter phase shifting significantly reduces both input and
output ripple current. Reducing ripple current allows for less
input and output capacitance, reduces power dissipation, and
improves efficiency. Figure 45 shows a comparison of the two
approaches.
Current Limit and Over-Temperature Protection
Peak input current is limited for overload conditions. As load
impedance decreases and the output voltage falls closer to
zero, more power is dissipated internally, raising the device
temperature. Thermal protection completely disables switching
when internal dissipation becomes excessive, protecting the
device from damage. The junction over-temperature threshold
is 140 °C with 15 °C of hysteresis. If the junction temperature
The regulator comes with complete short circuit and thermal
protection. The combination of these two internal protection
circuits gives a comprehensive safety system to guard against
extreme adverse operating conditions.
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17
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Charge Enable
CEN = High
No
Yes
Yes
V
IN OVP Test
Shutdown
VIN > VOVP
No
No
V
IN UVLO Test
VIN > VUVLO
Yes
Preconditioning
Current Charge
Yes
Preconditioning Test
Yes
Yes
Yes
Yes
Temperature Detection
V
MIN > VBAT
TJ
> 140 °C
No
No
No
CC Phase Test
Constant Current
Charge
Temperature Detection
> 110 °C
V
BAT_EOC > VBAT
TJ
No
Yes
Thermal Loop
Charge Current
Reduction
CV Phase Test
Constant Voltage
Charge Mode
I
TERM < IBAT
No
Recharge Test
No
Sleep Mode
(VBAT_REG – 0.1) < VBAT
tc384
Figure 46. Battery Charger Operation Flowchart
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18
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
100mA
500mA
Application Information
Battery Charger
RTERM 133
103 26.7 k
At this RTERM setting, when the other fast charge current is
300 mA set by IR1, according to the same charge termination
current percentage (20%), the ICH_TERM is 60 mA when IR1 is
active to set the fast charge current by ISEL = high.
Figure 46 shows the battery charger operation flowchart.
Programmable Charge Current
The AAT3607 has two pins (IR0 and IR1) for two kinds of charge
current level setting selected by ISEL. When ISEL is low, the
constant charge current is set by the resistor connected
between IR0 and ground; when ISEL is high, it is set by the
resistor between IR1 and ground. The programmed charge
current up to 1 A can be calculated by:
Floating the ITERM pin sets the termination charge current to a
default 10% of the fast charge current.
Table 6 shows some standard metal resistor values for different
charge termination current percentages.
Table 6. Standard 1% Metal Film Resistor Values for
Charge Termination Current Percentage Setting.
2
RSET
ICH_CC
KISET
KISET
Charge Termination
Current Percentage (%)
RTERM (k)
13.3 or float
20
2
RSET
10
15
20
25
30
35
40
45
50
ICH_CC
Among them, KISET = 800. Table 5 gives the recommended 1%
tolerance metal film resistance values for a desired constant
current charge level.
26.7
34
41.2
Table 5. Standard 1% Metal Film Resistor Values
for Constant Current Setting
47.5
53.6
ICH_CC (mA)
50
RSET (k)
32.4
21.5
16
60.4
66.5
75
100
Charge Status Indication
200
8.06
5.36
4.02
3.24
2.67
2.32
2
The AAT3607 has one status LED driver output with open drain
structure. This single LED can indicate simple functions such as
battery charging, charge complete, and charge disabled as
shown in Table 7.
300
400
500
600
Table 7. LED Status at Different Charge States
700
Description
Battery charging
Charge complete
Charge disabled
EN
high
high
low
LED Status
800
on
off
off
900
1.78
1.60
1000
Programmable Charge Termination Current Percentage
Reverse Blocking
The charge termination current percentage of fast charge
current can be programmed by an external resistor connected
between ITERM and GND. This resistance can be calculated by
The AAT3607 includes internal circuitry that eliminates the need
for series blocking diodes, reducing solution size and cost as
well as dropout voltage relative to conventional battery
chargers. When the input supply is removed or when VIN goes
below the AAT3607 Under-Voltage Lockout (UVLO) voltage, or
when VIN drops below VBAT, the AAT3607 automatically
reconfigures its power switches to minimize current drain from
the battery.
ICH _TERM
RTERM 133
103
ICH_CC
when ICH_CC is the fast charge current. For example, if the
design’s intended charge termination current is 100 mA for a
500 mA fast charge current set by IR0, then
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Charge Current Reduction
R2
R1
VOUT 0.6V 1
In many instances, product system designers do not know the
real properties of potential ports used to supply power to the
battery charger. Typically, powered USB ports found on desktop
and notebook PCs should supply up to 500 mA. In the event the
input power being used to supply the charger is unable to
provide the programmed fast charge current or if the system
under charge must also share supply current with other
functions, the AAT3607 automatically reduces charge current to
maintain SYS voltage not less than 4.5 V typical value.
or
V
OUT
R2
1 R1
0.6V
Table 8. Resistor Selection for Output Voltage Setting; Standard
1% Resistor Values Substituted Closest to the Calculated
Values
R1 = 59 k
R2 (k)
R1 = 316 k
R2 (k)
VOUT (V)
0.8
Step-down Converter
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
105
158
210
261
316
365
422
475
634
655
732
1000
1430
Programmable Output Voltage
0.9
For applications requiring an adjustable output voltage, the
AAT3607 buck converter outputs can be externally
programmed. Resistors R1 and R2 of Figure 47 program the
output to regulate at a voltage higher than 0.6 V. To limit the
bias current required for the external feedback resistor string
while maintaining good noise immunity, the minimum
suggested value for R1 is 59 k. Although a larger value further
reduces quiescent current, it also increases the impedance of
the feedback node, making it more sensitive to external noise
and interference. Table 8 summarizes the resistor values for
various output voltages with R1 set to either 59 k for good
noise immunity or 316 k for reduced no load input current.
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
124
137
2.5
187
The AAT3607, combined with an external feed-forward
capacitor (C2 in Figure 47), delivers enhanced transient
response for extreme pulsed load applications. The addition of
the feed-forward capacitor typically requires a larger output
capacitor C3 for stability. The external resistor sets the output
voltage according to the following equation:
3.3
267
L1 2.2 μH
VOUT
VIN
LX
VIN
C2
22 pF
AAT3607
PGND
C1
10 μF
C3
10 μF
FB
R1
267 kΩ
R1
59 kΩ
tc385
Figure 47. AAT3607 Basic Application Circuit with Programmable Output Voltage
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Low Dropout (LDO) Regulator
Programmable Output Voltage
Always examine the ceramic capacitor DC voltage coefficient
characteristics when selecting the proper value. For example,
the capacitance of a 10 F, 6.3 V, X5R ceramic capacitor with
5.0 V DC applied is actually about 6 F.
For applications requiring an adjustable output voltage, the
AAT3607 LDO regulator outputs can also be externally
programmed similar to the buck converter outputs. The
feedback voltage is also set to 0.6 V, so the values of R1 and R2
are determined by the equation:
The maximum input capacitor RMS current for a single
converter is:
VOUT
VIN
VOUT
VIN
IRMS IOUT
1
R2
R1
VOUT 0.6V 1
The input capacitor provides a low impedance loop for the
edges of pulsed current drawn by the AAT3607. Low ESR/ESL
X7R and X5R ceramic capacitors are ideal for this function. To
minimize parasitic inductances, the capacitor should be placed
as closely as possible to the IC. This keeps the high frequency
content of the input current localized, minimizing EMI and input
voltage ripple.
or
V
OUT
R2
1 R1
0.6V
Inductor Selection
The step-down converter uses peak current mode control with
slope compensation to maintain stability for duty cycles greater
than 50%. The output inductor value must be selected so the
inductor current down slope meets the internal slope
compensation requirements. For most designs, the AAT3607
operates with inductor values of 2.2 H to 3.3 H. Inductors
with lower inductance values are physically smaller but
generate higher inductor current ripple leading to higher output
voltage ripple.
In applications where the input power source lead inductance
cannot be reduced to a level that does not affect the converter
performance, a high ESR tantalum or aluminum electrolytic
should be placed in parallel with the low ESR/ESL bypass
ceramic capacitor. This dampens the high Q network and
stabilizes the system.
Output Capacitor
The output capacitor limits the output ripple and provides
holdup during large load transitions. A typical 4.7 F X5R or
X7R ceramic capacitor typically provides sufficient bulk
capacitance to stabilize the output during large load transitions
and has the ESR and ESL characteristics necessary for low
output ripple.
Manufacturer 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
but still result in excessive losses due to a high DCR.
The output voltage droop due to a load transient is dominated
by the capacitance of the ceramic output capacitor. During a
step increase in load current, the ceramic output capacitor
alone supplies the load current until the loop responds. Within
two or three switching cycles, the loop responds and the
inductor current increases to match the load current demand.
The relationship of the output voltage droop during the three
switching cycles to the output capacitance can be estimated by:
Always consider the losses associated with the DCR and its
effect on the total converter efficiency when selecting an
inductor.
Input Capacitor
Select a 10 F to 22 F X7R or X5R ceramic capacitor for the
input. To estimate the required input capacitor size, determine
the acceptable input ripple level (VPP) and solve for CIN. The
calculated value varies with input voltage and is a maximum
when VIN is double the output voltage.
3 ILOAD
VDROOP fSW
COUT
Once the average inductor current increases to the DC load
level, the output voltage recovers. The above equation
establishes a limit on the minimum value for the output
capacitor with respect to load transients.
VOUT
VIN
VOUT
VIN
1
CIN
VPP
- ESR fSW
IOUT
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21
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Power Calculations
TJ ( MAX ) pTOTAL JA TA
Layout Considerations
There are three types of losses associated with the AAT3607
step-down converters: switching losses, conduction losses, and
quiescent current losses. Conduction losses are associated with
the RDS(ON) characteristics of the power output switching
devices. Switching losses are dominated by the gate charge of
the power output switching devices. At full load, with
Continuous Conduction Mode (CCM), a simplified form of the
losses is given by:
When laying out the PC board of the AAT3607, follow the
guidelines below:
For the best results physically place the battery pack as close
to the AAT3607 BAT pin as possible.
To minimize voltage drops on the PCB, keep the high current
carrying traces adequately wide.
VOUT
VIN
VOUT
VIN
pBUCK I 2
R
DS( ON )P
RDS( ON )N 1
For maximum power dissipation of the AAT3607 TQFN
package, the exposed pad should be soldered to the board
ground plane to further increase local heat dissipation.
OUT
tSW fS IOUT VIN IQ V\IN
A ground pad below the exposed pad is strongly
IQ is the step-down converter quiescent current. tSW is the
recommended.
switching time, RDS(ON)P and RDS(ON)N are the high side and low
side switching MOSFETs’ on-resistance. VIN, VOUT and IOUT are
the input voltage, the output voltage and the load current.
Evaluation Board Description
The AAT3607 Evaluation Board is used to test the AAT3607
power management unit. A schematic diagram for the AAT3607
Evaluation Board is provided in Figure 48, and the board layer
details are shown in Figure 49. The actual bill of materials
required for the AAT3607 Evaluation Board is shown in Table 9.
Since R DS(ON), quiescent current, and switching losses all vary
with input voltage, the total losses should be investigated over
the complete input voltage range.
For all the LDOs,
PD(MAX)
VIN VOUT IOUT( MAX )
Package Information
Package dimensions for the 28-pin TQFN package are shown in
Figure 50. Tape and reel dimensions are shown in Figure 51.
The total power losses of step-down converter and LDOs can be
expressed as
P
P
pD( MAX )
TOTAL
BUCK
Given the total losses, the maximum junction temperature can
be derived from the JA for the package.
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22
Data Sheet • AAT3620 Single Cell Li+ Switch Mode Battery Charger
BAT
U1
AAT3607
C4
VIN
23
16
10 μF
VIN
BAT
4.1 V to 5.5 V
R
SET
0
1
3.24 kΩ
1.6 kΩ
26
C1
10 μF
10 V
17
9
SYS
4.1 V to 5.5 V
IR0
IR1
RF11
SYS
R
SET
25
27
59 kΩ
PB
C3
C2
R1 1 kΩ
RTERM 13.3 kΩ
ITERM
ISEL
CEN
10 μF
10 μF
24
28
6
4
PGND
CHG
D1
JISEL
JCEN
Red
RF12
59k
R2 100 kΩ
L1 2.2 μH
15
5
RST
19
21
LO1
BO1
3 V/400 mA
RL11 215 kΩ
RL12 59 kΩ
LO1
2.8 V/150 mA
LX1
LFB1
12
CB12
RB11 237 kΩ
RB12 59 kΩ
L2 2.2 μH
CB11
4.7 μF
BFB1
CL1
2.2 μF
18
20
LO2
1.8 V/150 mA
LO2
RL21 118 kΩ
RL22 59 kΩ
CL2
2.2 μF
LFB2
7
BO2
1.8 V/300 mA
LX2
CB22
CB21
4.7 μF
11
BFB2
RB21 118 kΩ
14
13
1
ENL1
ENL2
ENB1
ENB2
ENB3
JENL1
JENL2
JENB1
JENB2
JENB3
RB22 59 kΩ
L3 2.2 μH
8
BO3
1.2 V/300 mA
LX3
BFB3
AGND
CB32
10
22
CB31
4.7 μF
2
RB31 59 kΩ
3
RB32 59 kΩ
EP
0
tc386
Figure 48. AAT3607 Evaluation Board Schematic
tc387
(a) Top Layer
(b) Bottom Layer
Figure 49. AAT3607 Evaluation Board Layer Details
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9
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Table 9. AAT3607 Evaluation Board Bill of Materials (BOM)
Component
Part Number
Description
PMU with OVP Dynamic Li-ion Charger
Cap Ceramic, 10 F, 0805 X7R, 10 V, 10%
Cap Ceramic, 4.7 F, 0603 X5R, 6.3 V, 10%
Cap Ceramic, 2.2 F, 0603 X7R, 6.3 V, 10%
Manufacturer
Skyworks
Murata
U1
AAT3607
C1, C2, C3, C4
CB11, CB21, CB31
CL1, CL2
GRM21BR71A106KE51
GRM188R60J475KE19
GCM188R70J225KE22
Not populated
Murata
Murata
CB12, CB22, CB32
L1, L2, L3
R1
LQH3NPN2R2NM0L
RC0603FR-071KL
2.2 H, 73 m, 1.25 A, 20%
Murata
Yageo
Yageo
Yageo
Res, 1 k, 1/10W, 1% 0603 SMD
Res, 100 k, 1/10W, 1% 0603 SMD
Res, 237 k, 1/10W, 1% 0603 SMD
R2
RC0603FR-07100KL
RC0603FR-07237KL
RB11
RB12, RB22, RB31, RB32,
RF11, RF12, RL12, RL22
RC0603FR-0759KL
Res, 59 k, 1/10W, 1% 0603 SMD
Yageo
RB21, RL21
RL11
RC0603FR-07118KL
RC0603FR-07215KL
RC0603FR-073K24L
RC0603FR-071K6L
RC0603FR-0713K3L
0805KRCT
Res, 118 k, 1/10W, 1% 0603 SMD
Res, 215 k, 1/10W, 1% 0603 SMD
Res, 3.24 k, 1/10W, 1% 0603 SMD
Res, 1.6 k, 1/10W, 1% 0603 SMD
Res, 13.3 k, 1/10W, 1% 0603 SMD
Red LED 0805
Yageo
Yageo
Yageo
Yageo
Yageo
HB
RSET0
RSET1
RTERM
D1
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DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Pin 1 Dot
by Marking
Detail "A"
C0.3
2.600 0.050
4.000 0.050
Bottom View
Top View
0.430 0.050
0.400 0.050
0.750 0.050
0.203 REF
0.050 0.050
Pin 1 Indicator
Side View
All dimensions are in millimeters
Detail "A"
tc388
Figure 50. AAT3607 28-Pin, 4 mm 4 mm TQFN Package Dimensions
1.10
2.00 0.05
1.75 0.10
4.00
Ø1.50 0.10
5.50 0.05
4.35 0.10
0.30 0.05
Pin 1 Location
8.00 0.10
4.35 0.10
tc186
All dimensions are in millimeters
Figure 51. AAT3607 Tape and Reel Dimensions
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25
DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER
Ordering Information
Model Name
Part Marking (Note 1)
Manufacturing Part Number
AAT3607INJ-T1
Evaluation Board Part Number
AAT3607: PMU with OVP Dynamic Li-ion Charger
Note 1: XY = assembly and date code.
C1XYY
AAT3607INJ-EVB
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