ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
5V/1.5A Backup Battery Pack Manager
FEATURES
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)
APPLICATIONS
Backup Battery Pack
Power Bank
Mobile Power
Standalone Battery Charger with USB Output
Adaptive to 10mA-2400mA Input Sources
Battery Disconnection at Output Short
<10µA Low Battery Leakage Current at HZ
GENERAL DESCRIPTION
ACT2801/ACT2801B/ACT2801C is a space-saving
and high-performance low-profile single-chip
solution for backup battery pack and standalone
battery charger. ACT2801/ACT2801B/ACT2801C
integrates all the functions that a backup battery
pack needs, including switching charger, boost
converter and LED indication.
ACT2801/ACT2801B/ACT2801C
operates
at
1.1MHz for switching charger and 0.55MHz for
boost converter allowing tiny external inductor and
capacitors.
ACT2801/ACT2801B/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.
ACT2801/ACT2801B/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.
ACT2801/ACT2801B/ACT2801C boost converter
steps battery voltage up to 5V. Boost converter
features high efficiency, constant current regulation,
short circuit protection and over voltage protection.
ACT2801/ACT2801B/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.
Mode During Storage
Boost Auto Turn-off at No Load and Push
Button Turn-on
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
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
Charge Current Foldback at 110°C Die
Temperature
IC Over Temperature Protection at 160°C
QFN4x4-24 Package
Vbat
5.5
Boost CC/CV Curve
Output Voltage (V)
V
BAT
=3.7V
5.0
V
BAT
=3.2V
4.5
4.0
V
BAT
=4.1V
3.5
3.0
0
200
400
600
800
1000
1200
1400
Vin
LED1 LED2 LED3 LED4 BAT
VIN
VOUT
RIMC
PB
BLVS
PB
PGND
AGND HZ
R5
100k
R6
60k
BTV
TH
Vout
ACT2801
SW
CSP
Vbat
L1 2.2uH
Rcs
50mΩ
NTC
C2
22uF
10V
C3
22µF
10V
R7
2.7Ω
C1
4.7uF
10V
CSN
ILIM IOST ICST
R3 R4
R1 R2
25k 1.5k 97.6k 39k
GND
Output Current (mA)
-1-
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Copyright © 2015-2017 Active-Semi, Inc.
Innovative Power
TM
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
ORDERING INFORMATION
PART NUMBER
ACT2801QL-T1028
ACT2801BQL-T1028
ACT2801CQL-T1028
OUTPUT FLASHLIGHT
5V/1.5A
5V/1.5A
5V/1.5A
No
Yes
Yes
LEDS AL-
LATCH OFF
BOOST
PB TURN
WAYS ON IN AT BOOST LIGHT LOAD PACKAGE
OFF BOOST
BOOST
UVLO
OFF TIME
Yes
No
No
No
Yes
No
Yes
Yes
Yes
16s
16s
16s
QFN44-24
QFN44-24
QFN44-24
PIN CONFIGURATION
TOP VIEW
TH/FLD
BLVS
RIMC
LED4
LED3
22
21
20
24
23
HZ
PB
AGND
nPG
ILIM
VIN
LED2
19
18
17
16
15
1
2
3
4
5
6
7
8
9
LED1
BTV
ICST
IOST
CSN
CSP
EP
10
11
12
14
13
PGND
VOUT
VOUT
QFN44-24
Innovative Power
TM
-2-
BAT
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Copyright © 2015-2017 Active-Semi, Inc.
SW
SW
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
PIN DESCRIPTIONS
PIN
1
NAME
HZ
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.
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. For ACT2801B/ACT2801C, if this pin is pushed for 3s, flashlight is
enabled.
Logic Ground. AGND must be connected to PGND externally through ground plane.
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.
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.
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 must be connected to AGND externally through
ground plane.
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.
Positive terminal of charge current sense input. Kevin sense is required with 10nF
ceramic capacitor right across CSP and CSN pins.
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.
Battery termination voltage setting. Connect a resistor from this pin to AGND to
program battery charge termination voltage.
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.
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 not use, put 10K
pull down resistor to AGND.
FLD: ACT2801B/ACT2801C
Open-drain flashlight driver. A internal switch can handle up to 50mA.
2
PB
3
4
5
6
7, 8
9, 10
11
AGND
nPG
ILIM
VIN
VOUT
SW
PGND
12
13
14
15
16
17
18
19
20
21
22
23
BAT
CSP
CSN
IOST
ICST
BTV
LED1
LED2
LED3
LED4
RIMC
BLVS
24
TH/FLD
25
Innovative Power
TM
EP
Exposed pad. Must be soldered to ground on the PCB.
-3-
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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
ABSOLUTE MAXIMUM RATINGS
PARAMETER
All the Pin to PGND and AGND
Junction to Ambient Thermal Resistance
Maximum Power Dissipation
Operating Ambient Temperature
Operating Junction Temperature
Storage Junction Temperature
Lead Temperature (Soldering 10 sec.)
VALUE
-0.3 to 6.5
40
2.5
-40 to 85
-40 to 150
-40 to 150
300
UNIT
V
°C/W
W
°C
°C
°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.
Innovative Power
TM
-4-
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Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
ELECTRICAL CHARACTERISTICS
(V
IN
= 5V, T
A
= 25°C, unless otherwise specified.)
PARAMETER
Input Current Limit
Input Voltage Range
V
IN
Over Voltage Protection
Input Voltage Validation Time
Input Current Limit Setting Range
Input Current Setting
Input Current Limit Gain
Leakage Current from VOUT to VIN in Boost
Mode
Battery Discharge Current in High-Z Mode
TEST CONDITIONS
MIN
TYP
MAX UNIT
4.5
VIN rising, V
IN
_OVP
VIN_UVLO<VIN<VIN_OVP
R
ILIM
=1.2kΩ—4.8kΩ
R
ILIM
=1.5kΩ
0.5
1.6
2000
3.0V<VBAT<4.35V, Ta=25℃
3.0V<VBAT<4.35V
,
Ta=25℃
0
7.5
5.5
6.0
32
5.5
6.5
V
V
ms
2.0
A
A
10
15
µ
A
µ
A
Power Switches
VIN-to-VOUT FET on Resistance
VOUT-to-SW FET on Resistance
SW-to-PGND FET on Resistance
90
70
75
mΩ
mΩ
mΩ
Buck Converter
Switching Frequency
High Side Switch Peak Current Limit
Minimum On-time
Over Temperature Protection (OTP)
OTP Hysteresis
OTP rising
OTP falling
-15%
4.5
1.1
6
100
160
35
+15%
MHz
A
ns
℃
℃
Charge Mode
Charge Current Setting Range
Charge Current Setting (I
CHRG
)
Thermal Regulation Temperature
Battery Adjust Voltage(V
BAJ
)
End of Charge (EOC) Voltage
EOC Voltage Accuracy
Battery Over Voltage Threshold
Battery Over Voltage Threshold Hysteresis
Innovative Power
TM
Rcs=50mΩ, R
ICST
=20kΩ—60.4kΩ
Rcs=50mΩ, R
ICST
=39kΩ
0.5
-10%
975
110
1.5
+10%
A
mA
℃
V
V
V
V
mV
Rbtv=25kΩ
0.1
-0.5% 4.1+V
BAJ
0.5%
Rbtv=0
VBAT rising
VBAT falling
-5-
4.1
4.6
200
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