ACT2801QL-T1026 [ACTIVE-SEMI]
5V/1.5A Backup Battery Pack Manager;
| 型号： | ACT2801QL-T1026 |
| 厂家： | 
ACTIVE-SEMI, INC |
| 描述： | 5V/1.5A Backup Battery Pack Manager 电池 |
| 文件： | 总23页 (文件大小：614K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACT2801/ACT2801C
Rev 2, 15-Apr-14
5V/1.5A Backup Battery Pack Manager
FEATURES
APPLICATIONS
• Backup Battery Pack
• Power Bank
• Mobile Power
• Standalone Battery Charger with USB Output
• Dedicated Single Chip Solution for Mobile Power
With Minimal Component Count
• 5V/1.5A Constant Output Current Limit in Boost
Mode
• 1.5A Switching Charger Limit
• Programmable 4.1V to 4.35V Battery Voltage
• 95% Boost Efficiency (Vbat=4.1V)
• Adaptive to 10mA-2400mA Input Sources
• Battery Disconnection at Output Short
GENERAL DESCRIPTION
ACT2801/ACT2801C is a space-saving and high-
performance low-profile single-chip solution for
backup battery pack and standalone battery
charger. ACT2801/ACT2801C integrates all the
functions that a backup battery pack needs,
including switching charger, boost converter and
LED indication.
• <10µA Low Battery Leakage Current at HZ
Mode During Storage
• Boost Auto Turn-off at No Load and Push
Button Turn-on
ACT2801/ACT2801C operates at 1.1MHz for
switching charger and 0.55MHz for boost converter
allowing tiny external inductor and capacitors.
ACT2801/ACT2801C provides a direct power path
from input to output with programmable current limit
while providing power to switching charger. Output
has higher priority than battery charger if the
programmed input current limit is reached.
• Battery Over Current, Over Voltage, Over
Temperature and Short Circuit Protections
• Boost Auto Startup with Load Detection
• Up to 2.0A Input Current Limit with Prioritized
Power Path to Output
• 5V+/-100mV Output Voltage in Boost Mode
• 1.1MHz/0.55MHz Switching Frequencies
ACT2801/ACT2801C charges battery with full cycle
of preconditioning, fast charge with constant current
and constant voltage until end of charge. The
battery charger is thermally regulated at 110°C with
charge current foldback.
• 2.2uH SMD Inductor and Low Profile Ceramic
Capacitor
• 4 LEDs Battery Level and Status Indication
• Battery Impedance Compensation
• Full Cycle of Battery Charge Management
Preconditioning, Fast Charge, Top off and End
of Charge
ACT2801/ACT2801C boost converter steps battery
voltage up to 5V. Boost converter features high
efficiency, constant current regulation, short circuit
protection and over voltage protection.
• Charge Current Foldback at 110°C Die
Temperature
ACT2801/ACT2801C provides 3.5mA constant
currents to drive 4 LEDs to indicate battery level
and charge status. Battery impedance is
compensated for battery level indication.
• IC Over Temperature Protection at 160°C
• QFN4x4-24 Package
Boost CC/CV Curve
5.5
VBAT =3.7V
5.0
VBAT =3.2V
4.5
4.0
VBAT =4.1V
3.5
3.0
0
200
400
600
800
1000
1200
1400
Output Current (mA)
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
ORDERING INFORMATION
CHARGE LOW BATTERY
CURRENT LEVEL ALARM
PLUG BATTERY
TURN ON BOOST
PART NUMBER
OUTPUT
FLASHLIGHT
PACKAGE
ACT2801QL-T0550 5V/1.5A
ACT2801QL-T1026 5V/1.5A
1.5A
1.5A
1.5A
No
Yes
Yes
No
No
Yes
No
QFN44-24
QFN44-24
QFN44-24
ACT2801CQL-T
5V/1.5A
Yes
No
PIN CONFIGURATION
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
Boost/high-Z mode enable pin, internally pulled up by a 3MΩ resistor to battery. When
HZ pin is pulled ground, boost is enabled if VIN is not present.
1
HZ
Push button input, connect a push button from this pin to AGND, internally pulled up
by a 3MΩ resistor to battery. PB starts up boost converter if HZ pin is grounded and
VIN is not present. When this pin is pushed for 100ms, LED1-4 indicators are enable
2
PB
for 5 seconds. For ACT2801C, if this pin is pushed for 3s, Flashlight is enabled.
3
4
AGND
nPG
Logic Ground.
Drive external P-FET to protect output short circuit and leakage during shutdown. nPG
pin is pulled up to VOUT internally. nPG pin is pulled low if VOUT is in the range.
Input current limit setting pin. Connect a resistor from this pin to AGND to set the input
current limit. The current setting ranges from 0.5A-2.0A.
5
6
ILIM
VIN
USB or AC adaptor input. When VIN is valid, charge and power path is enabled.
Output pin. Bypass to PGND with a high quality low ESR and ESL ceramic capacitor
placed as close to the IC as possible.
7, 8
9, 10
11
VOUT
SW
Internal switch to output inductor terminal.
Power ground. PGND is connected to the source of low-side N-channel MOSFET and
the MOSFET’s gate driver.
PGND
Battery input. Connected to the battery pack positive terminal to provide power in High-
Z mode. Bypass to PGND with a high quality ceramic capacitor placed as close to the
IC as possible.
12
BAT
Positive terminal of charge current sense input. Kevin sense is required with 10nF
ceramic capacitor right across CSP and CSN pins.
13
14
15
CSP
CSN
IOST
Negative terminal of charge current sense input.
Output current setting. Connect a resistor from this pin to AGND to set output constant
current. The current setting ranges from 0.5A-1.5A.
Fast charge current setting pin. Connect a resistor from this pin to AGND to set the
charge current. The current setting ranges from 0.5A-1.5A.
16
17
ICST
BTV
Battery termination voltage setting. Connect a resistor from this pin to AGND to
program battery charge termination voltage.
18
19
20
21
LED1
LED2
LED3
LED4
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery level indicator. An internal 3.5mA sink current limit is built in.
Battery impendence compensation input. Connect to a resistor from this pin to APNG
to program the battery impedance.
22
23
RIMC
BLVS
Battery level voltage shift. Connect a resistor from this pin to AGND to shift the battery
LED indication thresholds.
TH: ACT2801
Temperature sensing input. Connect to battery thermistor terminal. If no use, put 10K
pulled down resistor.
24
TH/FLD
EP
FLD: ACT2801C
Open-drain Flashlight driver. A internal switch can handle up to 50mA.
25
Exposed pad. Must be soldered to ground on the PCB.
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
ABSOLUTE MAXIMUM RATINGSc
PARAMETER
VALUE
-0.3 to 6.5
40
UNIT
V
All the Pin to PGND and AGND
Junction to Ambient Thermal Resistance
Maximum Power Dissipation
°C/W
W
2.5
Operating Ambient Temperature
Operating Junction Temperature
Storage Junction Temperature
-40 to 85
-40 to 150
-40 to 150
300
°C
°C
°C
Lead Temperature (Soldering 10 sec.)
°C
c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
Input Current Limit
TEST CONDITIONS
MIN
TYP
MAX UNIT
Input Voltage Range
4.5
5.5
5.5
6.5
V
V
VIN Over Voltage Protection
VIN rising, VIN_OVP
VIN_UVLO<VIN<VIN_OVP
ILIM=1.2kΩ—4.8kΩ
6.0
32
Input Voltage Validation Time
ms
A
Input Current Limit Setting Range
Input Current Setting
R
0.5
2.0
RILIM=1.5kΩ
1.6
A
Input Current Limit Gain
2000
Leakage Current from VOUT to VIN in Boost
Mode
0
10
15
µA
µA
3.0V<VBAT<4.35V, Ta=25℃
3.0V<VBAT<4.35V, Ta=25℃
Battery Discharge Current in High-Z Mode
7.5
Power Switches
VIN-to-VOUT FET on Resistance
VOUT-to-SW FET on Resistance
SW-to-PGND FET on Resistance
Buck Converter
90
70
75
mΩ
mΩ
mΩ
Switching Frequency
-15%
4.5
1.1
6
+15% MHz
High Side Switch Peak Current Limit
Minimum On-time
A
100
160
ns
Over Temperature Protection (OTP)
OTP rising
OTP falling
℃
℃
OTP Hysteresis
35
Charge Mode
Charge Current Setting Range
Rcs=50mΩ, RICST=20kΩ—60.4kΩ
Rcs=50mΩ, RICST=39kΩ
0.5
1.5
A
Charge Current Setting (ICHRG
)
-10%
975
110
0.1
+10% mA
Thermal Regulation Temperature
Battery Adjust Voltage(VBAJ)
End of Charge (EOC) Voltage
EOC Voltage Accuracy
℃
Rbtv=25kΩ
V
-0.5% 4.1+VBAJ 0.5%
4.1
V
V
Rbtv=0
Battery Over Voltage Threshold
Battery Over Voltage Threshold Hysteresis
Fast Charge Current
VBAT rising
4.6
200
ICHRG
10
V
mV
A
VBAT falling
VBAT=3.5V
Precondition Charge Current
2.5V≤VBAT≤2.8V, Percent of ICHRG
%
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
Precondition Voltage Threshold
Precondition Voltage Threshold Hysteresis
Low VBAT Charge Current
TEST CONDITIONS
MIN TYP MAX UNIT
VBAT rising, Rbtv=0
2.8
130
200
13
V
mV
mA
%
VBAT=1V, RICST=39kΩ
EOC Current Threshold
Percent of the fast charge current
Charge Restart Voltage Threshold
200
mV
Cold detect NTC thermistor
ACT2801-T0550/ACT2801-T1026
TH Upper Temperature Voltage Threshold
TH Lower Temperature Voltage Threshold
1.5
0.3
V
V
Hot detect NTC thermistor
ACT2801-T0550/ACT2801-T1026
TH Hysteresis
ACT2801-T0550/ACT2801-T1026
ACT2801-T0550/ACT2801-T1026
50
60
mV
µA
TH Internal Pull-up Current
Charge Current Foldback
Charge Current Reduction Threshold1 of Vout1 Starting foldback point
4.59
3.0
4.7
4.81
4.5
V
V
Stop foldback point, RCS=50mΩ,
Charge Current Reduction Threshold2 of Vout1
4.57
RICST=39kΩ
Boost Mode
Input Voltage Operation Range
Switching Frequency
V
-15% 0.55 +15% MHz
Input Voltage UVLO
VBAT rising
VBAT falling
Ta=25℃
3.3
400
V
mV
V
Input Voltage UVLO Hysteresis
Output Voltage (VOUT)
Output Voltage Accuracy
4.97 5.05
5.10
2
All conditions
-3
VOUT
%
V
Output Voltage Transient Response
Vbat=3.7V, 80mA-1A-80mA, 0.1A/us
VOUT rising
4.75
5.25
Output Over Voltage Protection
Output Over Voltage Protection Hysteresis
Output Current Regulation Range
Output Current Setting
5.7
V
mV
A
VOUT falling
300
0.5
1.5
Rcs=50mΩ, RIOST=37.5kΩ—113kΩ
Rcs=50mΩ, RIOST=97.6kΩ
All conditions
1.3
200
100
5.6
A
The Maximum Voltage Across VRcs
Minimum On-Time
mV
ns
A
Low Side Switch Peak Current Limit
VBAT=3.2V, VOUT=5V
4.0
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
Soft-Startup Time
400
4.25
4.6
3
µs
V
VOUT falling
Under Voltage Protection (UVP Threshold)
VOUT rising
V
UVP Blanking Time During Startup
UVP Sense Detection Time
Restart After UVP
ms
µs
VOUT falling
Hiccup mode
20
2
s
Light Load Current Shut off Threshold
Light Load Current Detect Time
Light Load Current Detect Time
HZ Pin High Voltage
VBAT=3.7V, Rcs=50mΩ, RIOST=97.6kΩ
ACT2801C/ACT2801-T1026
ACT2801-T0550
40
45
100
1.4
mA
s
90
s
HZ voltage rising
0.9
0.75
3
V
HZ Pin Low Voltage
HZ voltage falling
0.4
V
HZ Internal Pull-up Resistor
MΩ
PB Turn off Boost Time
PB Turn off Boost Time
PB Turn on Boost Time
Mode Transition
ACT2801C/ACT2801-T1026
ACT2801-T0550
1.5
3.0
100
s
s
ms
Transition Waiting Time between Charge
Mode and Boost Mode
TRANTIME
2
s
Battery Level Indication
Battery Impedance Compensation Range
Battery Impedance Compensation
40
500
1.4
mΩ
mΩ
ms
V
200
100
0.9
Rcs=50mΩ, RIMC=100kΩ
PB Deglitch Time
PB High Input Voltage
PB Low Input Voltage
PB voltage rising
PB voltage falling
0.4
0.75
V
PB Internal Pull-up Resistor
LED Indication Time
3
5
MΩ
s
PB is pushed and released
LED Flash Frequency
Charging, LED flash 1s on and 1s off
0.5
Hz
Flashlight Driver
Flashlight Driver Current
PB Turn on Flashlight Time
PB Turn off Flashlight Time
ACT2801C, the current at Flash Pin
ACT2801C
50
3.0
3.0
mA
s
ACT2801C
s
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
FUNCTIONAL BLOCK DIAGRAM FOR ACT2801
FUNCTIONAL BLOCK DIAGRAM FOR ACT2801C
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
FUNCTIONAL DESCRIPTION
ACT2801/ACT2801C is
a
complete battery
from battery is very low. ACT2801 system operation
flow chart as shown in Figure 1, and ACT2801C
system operation flow chart as shown in Figure 2.
charging and discharging power management
solution for applications of single-cell lithium-based
backup battery pack or power bank. There is a
power path from input to output with programmable
input current limit. When output is over loaded, the
input switch Q1 starts going into linear mode and
thus output voltage starts to drop. If output voltage
drops below 4.25V, the input switch Q1 turns off
and restart in 2 seconds.
Any transitions between boost mode and charge
mode go through HZ mode by turning off all the
switches Q1-Q3 into HZ mode for 2 seconds before
enabling the other mode.
The modes are determined by HZ pin and VIN pin
as shown in the table 1. A valid VIN voltage forces
ACT2801/ACT2801C into charge mode. Boost
mode is enabled if HZ pin is pulled low and VIN is
invalid or not present. When HZ=0, if PB is pulled
low for more than 100ms, boost converter is
enabled.
With the advanced ACT2801/ACT2801C
architecture, a synchronous buck/boost converter is
connected from VOUT to switching node (SW). With
the bidirectional architecture, the converter could be
configured as either buck to charge battery or boost
to discharge battery. With switching charger and
discharger, the higher charge current and higher
conversion efficiency are achieved.
Table 1: Mode Selection
HZ PIN
VIN Valid
Mode
0
0
0
1
1
0
1
1
Modes of Operation
Boost
Charge
HZ
Charge
ACT2801/ACT2801C has
3 operation modes:
charge mode, boost mode and high-impedance
(HZ) mode. In charge mode, the input current limit
Q1 is enabled and Q2 and Q3 operate as a buck
converter to charge battery. In boost mode, Q2 and
Q3 operate as boost converter to step battery
voltage up to +5V at VOUT, and the current limit
switch Q1 is turned off, and the reverse current from
VOUT to VIN is blocked. In HZ mode, all the
switches are turned off and the drainage current
Flashlight
ACT2801C has an Flashlight function. Once PB is
pressed for more than 3 seconds, the Flashlight is
switched on. The driver will deliver up to 50mA
current to the flashlight. If another 3 seconds event
happen, the flashlight will be switched off.
Figure 1:
ACT2801 System Operation Flow Chart
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ACT2801/ACT2801C
Rev 2, 15-Apr-14
FUNCTIONAL DESCRIPTION
Figure 2:
ACT2801C System Operation Flow Chart
at a reduced current, 10% of the programmed
maximum fast charge constant current. Once VBAT
Input Current Limit
reaches the precondition threshold voltage the state
machine jumps to the fast charge state.
When the input current reaches the programmed
value, switch Q1 goes into linear mode and output
voltage starts to drop. When output voltage drops to
4.25V, hiccup mode is triggered and switch Q1
turns off and restart in 2 seconds.
Fast Charge
If battery voltage is above preconditioning
threshold, buck converter charges battery with
constant current. In fast charge state, the ACT2801/
ACT2801C charges at the current set by the
external resistor connected at the ICST pin. During
a normal charge cycle fast charge continues in CC
mode until VBAT reaches the charge termination
voltage, at which point the ACT2801/ACT2801C
charges in top off state.
Switching Battery Charger
ACT2801/ACT2801C is configured in charge mode
(buck mode) when VIN is valid. In this mode, a
battery is charged with preconditioning, fast charge,
top-off and end of charge (EOC). The typical charge
management is shown in Figure 3 and Figure 4.
CC/CV Regulation Loop
Top Off
There are CC/CV regulation loops built in ACT2801/
ACT2801C, which regulates either current or
voltage as necessary to ensure fast and safe
charging of the battery. In a normal charge cycle,
this loop regulates the current to the value set by
the external resistor at the ICST pin. Charging
continues at this current until the battery cell voltage
reaches the termination voltage. At this point the
CV loop takes over, and charge current is allowed
to decrease as necessary to maintain charging at
the termination voltage.
With the battery voltage approaches the EOC
voltage set by the BTV pin. Charge current
decreases as charging continues. In the top off
state, the cell is charged in constant voltage (CV)
mode. During a normal charging cycle charging
proceeds until the charge current decreases below
the end of charge (EOC) threshold, defined as 13%
of fast charge current. When this happens, the state
machine terminates the charge cycle and jumps to
the EOC state.
End of Charge
Precondition Charge
When charges current decreases to 13% of set fast
charge current, the buck converter goes into end of
charge mode and keep monitoring the battery
voltage.
A new charging cycle begins with the precondition
state, and operation continues in this state until VBAT
exceeds the precondition threshold voltage. When
operating in precondition state, the cell is charged
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ACT2801/ACT2801C
Rev 2, 15-Apr-14
FUNCTIONAL DESCRIPTION
Recharge
When battery voltage drops by 200mV below the end of charge voltage, the charger is reinitiated with
constant current charge.
Figure 3.
Typical Li+ Charge Profile and ACT2801/ACT2801C Charge States
A: PRECONDITION STATE
B: FAST-CHARGE STATE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
Figure 4.
Charger State Diagram
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ACT2801/ACT2801C
Rev 2, 15-Apr-14
programmed by a resistor connected from BLVS
pin to AGND as shown in Figure 6. The following
equation shows the LED4 voltage threshold:
APPLICATIONS INFORMATION
Battery Charge Termination Voltage
VBATLED4(V ) = 3.5(V ) + 0.01(mA)× RBLVS(kΩ )
(2)
Battery charge termination voltage is set by a
resistor Rbtv connected from BTV pin to AGND as
shown in Figure 5. The battery charge termination
voltage is estimated as the following equation:
VBAT (V ) = 4.1(V ) + Rbtv ×4 ×10−6(V )
(1)
Rbtv is selected based on the battery voltage rating.
1% accuracy resistor is recommended for Rbtv.
Figure 6. Battery level voltage shift setting circuit
As long as LED4 is set, all the other 3 LED
thresholds is fixed as shown in the table 3:
Table 3: 4 LED Voltage Thresholds
RBLVS (ohm)
LED1
50K
60K
70K
80K
3.35V
3.60V
3.75V
4.00V
3.45V
3.70V
3.85V
4.10V
3.55V
3.80V
3.95V
4.20V
3.65V
3.90V
4.05V
4.30V
Figure 5. Battery terminal voltage setting circuit
LED2
LED3
LED Status Indication
LED4
4 LEDs ON/OFF and flash show the charge status
and the remained capacity level as shown in the
table 2. The LED status is based on battery voltage
and operation modes. When battery voltage is low,
LED1 is flashing. In charge mode, when a battery is
fully charged, flashing stops and all the 4 LEDs are
solid on.
Input Current Limit
An external resistor is used to set the input current
limit connected from ILIM pin to AGND as shown in
Figure 7. Input current limit has built-in soft startup
and current foldback control loop. The input current
limit is estimated as the following equation:
Battery level voltage shift (BLVS pin)
LED1-4 voltage thresholds are adjusted from HZ
mode during charging and discharging based on
the compensated impedance. Those thresholds are
2.4 (V)
IILIM (A) =
(3)
RILIM (kΩ )
Table2: LED Indication
Charge Mode
PB time>100ms (Boost or HZ Mode)
LED
LED1
Flash
LED2
Off
LED3
Off
LED4
Off
LED1
Off
LED2
Off
LED3
Off
LED4
Off
VBAT<LED1(ACT2801-T0550)
VBAT<LED1
(ACT2801-T1026/ACT2801C)
Flash
Off
Off
Off
Flash
Off
Off
Off
LED1≤VBAT<LED2
LED2≤VBAT<LED3
LED3≤VBAT<LED4
VBAT≥LED4
On
On
On
On
Flash
On
Off
Flash
On
Off
Off
On
On
On
On
Off
On
On
On
Off
Off
On
On
Off
Off
Off
On
On
Flash
Flash
On
On
VBAT≥LED4
(End of Charge)
On
On
On
On
On
On
On
On
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ACT2801/ACT2801C
Rev 2, 15-Apr-14
from IOST pin to AGND as shown in Figure 11. The
boost output current is estimated as the following
equation:
2
RIOST (kΩ )
Rcs (mΩ )
IIOST (A) = ( A)×
(5)
3
Figure 7. Input current limit setting circuit
Input current limit at various resistor curve is shown
in Figure 8.
3.0
2.5
2.0
1.5
Figure 11. Boost output current setting circuit
Figure 12 gives out boost output current with
various RIOST
.
1.0
0.5
1.9
1.6
0
0.7 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7
RILIM (kΩ)
Figure 8. Input current limit setting
1.3
1.0
0.7
Battery Fast Charge Current
Battery fast charge current is set by a resistor
connected from ICST pin to AGND as shown in
Figure 9. Figure 10 gives out different fast charge
current with various RICST. The battery fast charge
current is estimated as the following equation:
0.4
20
40
60
80
100
120
140
RIOST (kΩ)
Figure 12. Boost output current setting
Battery Impedance Compensation
RICST (kΩ )
Rcs(mΩ )
Ic(A) =1.25(A)×
(4)
An external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 13. RIMC
is corresponding to battery impedance. Higher RIMC
gives higher compensation voltage which is
positively proportional to battery charge/discharge
current.
Select RIMC based on battery impedance:
25 × R (mΩ )
Rcs (m Ω )
(6)
(7)
R
IMC(kΩ ) =
Figure 9. Battery fast charge current setting circuit
VBAT(V ) = BAT(V )−IBAT(A)×R(mΩ )×10-3
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
0
10
20
30
40
50
60
70
80
RICST (kΩ)
Figure 13. Battery impedance compensation setting circuit
Figure 10. Battery fast charge current setting
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
Boost Output Constant Current
Boost output current is set by a resistor connected
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ACT2801/ACT2801C
Rev 2, 15-Apr-14
Table 4: Battery Impedance
LEDs on in Boost Mode
RIMC(Kꢀ)
50
50
100
100
200
200
LEDs can be always on during boost mode, the
schematic is shown in Figure17.
Battery
Impedance
R(mꢀ)
Rcs=25mꢀ
Rcs=50mꢀ
200
100
400
Boost Output Plug-in Auto Detection
Figure 14 provides a solution for auto plug-in
detection.
Figure 17. LEDs on in boost mode circu
Inductor and Capacitor Selection
ACT2801/ACT2801C supports SMD components.
2.2uH inductor is recommended. Input side, 4.7uF
ceramic capacitor in series with 2.7Ω resistor are
recommended, on battery and output sides, 22uF
ceramic capacitors are recommended.
Figure 14. Boost output auto detection circuit
Battery Temperature Monitoring
Input Over Voltage Surge
ACT2801 continuously monitors the temperature of
the battery pack by sensing the resistance of its
thermistor, and suspends charging if the
temperature of the battery pack exceeds the safety
limits.
In the case of pure ceramic input capacitor is
chosen, if the input cable is long, stray inductance
may cause over voltage spikes as twice as the
steady-state voltage when input source is plugged
in. Below input circuit is recommended to avoid
input voltage surge. R1 resistor is added in series
with capacitor C1 to damp the potential LC
resonance as shown in Figure 15.
In a typical application, the TH pin is connected to
the battery pack's thermistor input as shown in
Figure 18. The ACT2801 injects a 60µA current out of
the TH pin into the thermistor, so that the thermistor
resistance is monitored by comparing the voltage at
TH to the internal VTHL and VTHH thresholds of 0.3V
and 1.5V, respectively. When VTH > VTHH or VTH < VTHL
charging and the charge timers are suspended. When
VTH returns to the normal range, charging and the
charge timers resume.
The threshold is given by:
Figure 15. Input over voltage surge protection circuit
60µA×RNOM×kHOT=0.3V→ RNOM×kHOT=5kꢀ
60µA×RNOM×kCOLD=1.5V → RNOM×kCOLD= 25kꢀ
External Input Over Voltage Protection
where RNOM is the nominal thermistor resistance at
room temperature, and kHOT and kCOLD are the ratios
of the thermistor's resistance at the desired hot and
cold thresholds, respectively.
Considering the maximum voltage rating at VIN pin,
the external OVP circuit as shown in Figure 16 is
recommended if input voltage may go higher than
7V. With the enhanced OVP circuit, input voltage
can be up to 18V.
Figure 18. Battery thermal circuit
Figure 16. Input over voltage protection
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
PC Board Layout Guidance
When laying out the printed circuit board, the
following checklist should be used to ensure proper
operation of the IC.
1. Arrange the power components to reduce the
AC loop size, VIN pin, Vout pin, SW pin and the
schottky diode.
close to VOUT and PGND as possible, SW
goes under the C2 (recommend C2 to use 1206
size). SW pad is a noisy node switching. It
should be isolated away from the rest of circuit
for good EMI and low noise operation.
6. Thermal pad is connected to GND layer through
vias (recommend 4X4 pins and the aperture is
10mil). Ground plane, PGND and AGND is
single point connected under the ACT2801/
ACT2801C thermal pad through vias to limited
SW area.
2. Place input decoupling ceramic capacitor C3
and R10 as close to VIN pin as possible.
Resistor R10 is added in series with capacitor
C3 to damp the potential LC resonance .
3. Use copper plane for power GND for best heat
dissipation and noise immunity.
7. From BAT pin to the Battery positive terminal,
need to lay the divided line to ensure the
battery voltage accuracy of sampling.
4. Place CSP and CSN capacitor C6 (10nF) close
to CSP and CSN pin as possible, use Kevin
Sense from sense resistor R2 and R2A to CSP
and CSN pins. 22uF decoupling capacitor is
added close to BAT pin.
8. RC snubber is recommended to add across SW
to PGND to reduce EMI noise. 1A /20V schottky
is added to across VOUT and SW pins.
A demo board PCB layout example is shown in the
figure 19.
5. Place the ceramic capacitor C2 and D1 as
Figure 19.
PCB Layout
Bottom Layer
Top Layer
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
Figure 20. Typical application circuit
(Input current limit 2.0A, fast charge current limit 1.5A, boost output constant current limit 1.3A)
Innovative PowerTM
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
Table 5:
BOM List
ITEM
1
REFERENCE
DESCRIPTION
QTY
1
MANUFACTURER
Sunlord
L1
Q1
SWPA4020S1R0NT 2.2uH 3.4A (4*4*2mm)
SI2333DDS, Rdson=28mꢀ at VGS = - 4.5 V
SS12, Vf=0.5V, 20V Schottky
2
1
Vishay
3
D1
1
Panjit
4
D2
1N4148, Vf=0.7V, 75V Schottky
1
Vishay
5
C2,C5
C3
Ceramic Capacitor, 22uF/10V, X7R, 1206
Ceramic Capacitor, 4.7uF/10V, X7R, 1206
Ceramic Capacitor, 0.1uF/10V, X7R, 0603
Ceramic Capacitor, 10nF/10V, X7R, 0402
Ceramic Capacitor, 1nF/10V, X7R, 0603
Ceramic Capacitor, 1uF/10V, X7R, 0603
Ceramic Capacitor, 2.2uF/10V, X7R, 0603
Chip Resistor, 1.2kꢀ, 1/16W, 1%, 0402
Chip Resistor, 50mꢀ, 1/4W, 1%, 1206
Chip Resistor, 97.6kꢀ, 1/16W, 1%, 0402
Chip Resistor, 60.4kꢀ, 1/16W, 1%, 0402
Chip Resistor, 25kꢀ, 1/16W, 1%, 0402
Chip Resistor, 10kꢀ, 1/16W, 1%, 0402
Chip Resistor, 60kꢀ, 1/16W, 1%, 0402
Chip Resistor, 100kꢀ, 1/16W, 1%, 0402
Chip Resistor, 1ꢀ, 1/8W, 5%, 0805
2
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
6
1
7
C4
1
8
C6
1
9
C7
1
10
11
12
13
14
15
16
17
18
19
20
21
22
C8
1
C11,C12,C13
R1
3
1
R2
1
R3
1
R4
1
R5
1
R6
1
R7
1
R8
1
R9
1
R10
R11
Chip Resistor, 2.7ꢀ, 1/4W, 5%, 1206
Chip Resistor, 200kꢀ, 1/10W, 5%, 0603
1
1
23
R12,R13
Chip Resistor, 715kꢀ, 1/10W, 5%, 0603
2
Murata/TDK
24
25
R14
R15
Chip Resistor, 100kꢀ, 1/10W, 5%, 0603
Chip Resistor, 2.2ꢀ, 1/10W, 5%, 0603
1
1
Murata/TDK
Murata/TDK
LED1,LED2,
LED3,LED4
26
LED, 0603, Blue
4
LED Manu
27
28
29
30
PB
USB
Push Button Switch
10.2*14.6*7mm, 4P
1
1
1
1
Nikkai Omron
Micro-USB
U1
MICRO USB 5P/F SMT B
IC, ACT2801, T-QFN 44-24
ACT
Innovative PowerTM
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
Figure 21. Typical application circuit
(Input current limit 2.0A, fast charge current limit 1.5A, boost output constant current limit 1.3A)
Innovative PowerTM
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
Table 6:
BOM List
ITEM
1
REFERENCE
DESCRIPTION
QTY
1
MANUFACTURER
Sunlord
L1
Q1
SWPA4020S1R0NT 2.2uH 3.4A (4*4*2mm)
SI2333DDS, Rdson=28mꢀ at VGS = - 4.5 V
SS12, Vf=0.5V, 20V Schottky
2
1
Vishay
3
D1
1
Panjit
4
D2
1N4148, Vf=0.7V, 75V Schottky
1
Vishay
5
C2,C5
C3
Ceramic Capacitor, 22uF/10V, X7R, 1206
Ceramic Capacitor, 4.7uF/10V, X7R, 1206
Ceramic Capacitor, 0.1uF/10V, X7R, 0603
Ceramic Capacitor, 10nF/10V, X7R, 0402
Ceramic Capacitor, 1nF/10V, X7R, 0603
Ceramic Capacitor, 1uF/10V, X7R, 0603
Ceramic Capacitor, 2.2uF/10V, X7R, 0603
Chip Resistor, 1.2kꢀ, 1/16W, 1%, 0402
Chip Resistor, 50mꢀ, 1/4W, 1%, 1206
Chip Resistor, 97.6kꢀ, 1/16W, 1%, 0402
Chip Resistor, 60.4kꢀ, 1/16W, 1%, 0402
Chip Resistor, 25kꢀ, 1/16W, 1%, 0402
Chip Resistor, 51ꢀ, 1/16W, 1%, 0402
Chip Resistor, 60kꢀ, 1/16W, 1%, 0402
Chip Resistor, 100kꢀ, 1/16W, 1%, 0402
Chip Resistor, 1ꢀ, 1/8W, 5%, 0805
2
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
Murata/TDK
6
1
7
C4
1
8
C6
1
9
C7
1
10
11
12
13
14
15
16
17
18
19
20
21
22
C8
1
C11,C12,C13
R1
3
1
R2
1
R3
1
R4
1
R5
1
R6
1
R7
1
R8
1
R9
1
R10
R11
Chip Resistor, 2.7ꢀ, 1/4W, 5%, 1206
Chip Resistor, 200kꢀ, 1/10W, 5%, 0603
1
1
23
R12,R13
Chip Resistor, 715kꢀ, 1/10W, 5%, 0603
2
Murata/TDK
24
25
R14
R15
Chip Resistor, 100kꢀ, 1/10W, 5%, 0603
Chip Resistor, 2.2ꢀ, 1/10W, 5%, 0603
1
1
Murata/TDK
Murata/TDK
LED1,LED2,
LED3,LED4
26
LED, 0603, Blue
4
LED Manu
27
28
29
30
31
LED
PB
FLASHLIGHT, WHITE
Push Button Switch
1
1
1
1
1
LED Manu
Nikkai Omron
USB
10.2*14.6*7mm, 4P
Micro-USB
U1
MICRO USB 5P/F SMT B
IC, ACT2801C, T-QFN 44-24
ACT
Innovative PowerTM
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 20, Ta = 25°C, unless otherwise specified)
Charge Current VS. Output Current
Battery Charge V/I Profile
1800
1500
1200
900
2100
VIN = 5.0V
VBAT = 3.5V
VIN = 5.0V
CHRG = 1.5A
I
1800
1500
Input Current
1200
Charge Current
900
600
600
300
0
300
0
0
300
600
900
1200
1500
1800
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Output Current(mA)
Vbat (V)
Boost Efficiency
Charge Efficiency
100.0
90.0
80.0
70.0
60.0
50.0
40.0
92.0
91.5
91.0
90.5
90.0
VIN = 5.0V
ICHRG = 1.5A
VBAT = 3.2V
VBAT = 3.7V
VBAT = 4.1V
89.5
89.0
0
200
400
600
800
1000
1200
1400
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Output Current (mA)
Vbat (V)
Battery Leakage VS. Temperature
(HZ Mode)
Battery Charge Current VS. Temperature
1800
1500
1200
900
25.0
20.0
15.0
10.0
VIN = 5.0V
VBAT = 3.5V
VBAT = 3.5V
VBAT = 4.1V
600
5.0
0
300
0
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
140
Temperature (°C)
Temperature (°C)
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 20, Ta = 25°C, unless otherwise specified)
Boost Output Constant Current Limit
Boost Output Voltage VS. Temperature
VS. Temperature
1400
5.4
5.3
5.2
5.1
5.0
VBAT = 3.5V
CV = 4.5V
Rcs=50mꢀ(1%)
VBAT = 3.5V
V
OUT = 5.05V
1350
1300
1250
1200
1150
4.9
4.8
-30
0
30
60
90
120
150
-30
0
30
60
90
120
150
Temperature (°C)
Temperature (°C)
Boost Output Constant Current Limit
VS. VBAT
Boost Output Voltage VS. Output Current
1330
1325
1320
1315
1310
5.15
5.10
5.05
5.00
4.95
4.90
VBAT = 4.1V
VBAT = 3.2V
1305
1300
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0
200
400
600
800
1000
1200
1400
Vbat (V)
Boost Output Current (mA)
Battery Leakage VS. Battery Voltage
(HZ Mode)
Boost Standby Current VS. Battery Voltage
8.0
7.0
6.0
5.0
4.0
3.0
2.0
051
0.50
0.49
0.48
0.47
0.46
0.45
1.0
0
0
1.0
2.0
3.0
4.0
5.0
2.8
3.1
3.4
3.7
4.0
4.3
4.6
Battery Voltage(V)
Battery Voltage(V)
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ACT2801/ACT2801C
Rev 2, 15-Apr-14
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(Schematic as show in Figure 20, Ta = 25°C, unless otherwise specified)
Boost Load Transient (80mA-1A-80mA)
Boost Load Transient (80mA-1A-80mA)
VBAT = 3.4V
VOUT = 5.0V
IIOST = 1.3A
VBAT = 4.1V
VOUT = 5.0V
IIOST = 1.3A
CH1
CH1
CH2
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 500mA/div
TIME: 1ms/div
CH1: VOUT, 200mV/div
CH2: IOUT, 500mA/div
TIME: 1ms/div
SW and Output Waveforms in Boost Mode
SW and Output Waveforms in Boost Mode
VBAT = 4.1V
VBAT = 3.4V
VOUT = 5.0V
IOUT = 1.0A
V
OUT = 5.0V
IOUT = 1.0A
CH1
CH2
CH1
CH2
CH1: VOUT, 10mV/div
CH2: VSW, 2V/div
TIME: 400ns/div
CH1: VOUT, 10mV/div
CH2: VSW, 2V/div
TIME: 400ns/div
Transition Between Buck Mode
and Boost Mode
VIN = 5.0V
VIN
VBAT = 4.1V
CH1
VnPG
CH2
CH3
Vout
CH1: VIN, 5V/div
CH2: VnPG, 5V/div
CH3: vout, 2V/div
TIME: 1s/div
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Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Rev 2, 15-Apr-14
PACKAGE OUTLINE
QFN44-24 PACKAGE OUTLINE AND DIMENSIONS
DIMENSION IN
MILLIMETERS
DIMENSION IN
INCHES
SYMBOL
MIN
0.700
0.000
MAX
0.800
0.050
MIN
0.028
0.000
MAX
0.031
0.002
A
A1
A3
b
0.200 REF
0.008 REF
0.180
3.850
3.850
2.500
2.500
0.300
4.150
4.150
2.800
2.800
0.007
0.152
0.152
0.098
0.098
0.012
0.163
0.163
0.110
0.110
D
E
D2
E2
e
0.500 BSC
0.020 BSC
L
0.350
0.450
---
0.014
0.018
---
R
0.200 TYP
0.008 TYP
K
0.200
0.008
Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each
product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use
as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of
the use of any product or circuit described in this datasheet, nor does it convey any patent license.
Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact
sales@active-semi.com or visit http://www.active-semi.com.
is a registered trademark of Active-Semi.
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Copyright © 2014 Active-Semi, Inc.
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