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ACT2802B Schematic ( PDF Datasheet ) - Active-Semi

Teilenummer ACT2802B
Beschreibung 5V/2.5A Backup Battery Pack Manager
Hersteller Active-Semi
Logo Active-Semi Logo 




Gesamt 25 Seiten
ACT2802B Datasheet, Funktion
ACT2802/ACT2802B/ACT2802C
Rev 7, 15-Jul-16
5V/2.5A Backup Battery Pack Manager
FEATURES
 Dedicated Single Chip Solution for Mobile Power
With Minimal Component Count
 5V/2.5A Constant Output Current Limit in Boost
Mode
 2.5A Switching Charger Current 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
 <10µA Low Battery Leakage Current at HZ
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 3.0A Input Current Limit with Prioritized
Power Path to Output
 5V+/-100mV Output Voltage in Boost Mode
 1.1MHz/0.55MHz Switching Frequencies
 2.2uH 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
APPLICATIONS
 Backup Battery Pack
 Power Bank
 Mobile Power
 Standalone Battery Charger with USB Output
GENERAL DESCRIPTION
ACT2802/ACT2802B/ACT2802C is a space-saving
and high-performance low-profile single-chip
solution for backup battery pack and standalone
battery charger. ACT2802/ACT2802B/ACT2802C
integrates all the functions that a backup battery
pack needs, including switching charger, boost
converter and LED indication.
ACT2802/ACT2802B/ACT2802C operates at
1.1MHz for switching charger and 0.55MHz for
boost converter allowing tiny external inductor and
capacitors. ACT2802/ACT2802B/ACT2802C
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.
ACT2802/ACT2802B/ACT2802C 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.
ACT2802/ACT2802B/ACT2802C boost converter
steps battery voltage up to 5V. Boost converter
features high efficiency, constant current regulation,
short circuit protection and over voltage protection.
ACT2802/ACT2802B/ACT2802C provides 3.5mA
constant currents to drive 4 LEDs to indicate
battery level and charge status. Battery impedance
is compensated for battery level indication.
Innovative PowerTM
-1-
Boost CC/CV Profile
5.5
VBAT =3.2V
5.0
VBAT =3.7V
4.5
4.0
VBAT =4.1V
3.5
3.0
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
Output Current (A)
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Copyright © 2016 Active-Semi, Inc.






ACT2802B Datasheet, Funktion
ACT2802/ACT2802B/ACT2802C
Rev 7, 15-Jul-16
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
Fast Charge Current
VBAT=3.5V
Precondition Charge Current
Precondition Voltage Threshold
Precondition Voltage Threshold Hysteresis
Low VBAT Charge Current
EOC Current Threshold
Charge Restart Voltage Threshold
TH Upper Temperature Voltage Threshold
TH Lower Temperature Voltage Threshold
TH Hysteresis
2.4VVBAT2.8V, Percent of ICHRG
VBAT rising, Rbtv=0
VBAT=1V, RICST=43.2k
VBAT=4.2V, percent of the fast
charge current
Cold detect NTC thermistor,
ACT2802QL-T1028
Hot detect NTC thermistor,
ACT2802QL-T1028
ACT2802QL-T1028
TH Internal Pull-up Current
LED Flash Frequency
Charge Current Foldback
ACT2802QL-T1028
LED flash 1s on and 1s off
Charge Current Reduction Threshold1 of Vout1 Starting foldback point
Charge Current Reduction Threshold2 of Vout1
Stop foldback point, RCS=25m,
RICST=43.2k
Boost Mode
MIN
4.59
TYP MAX UNIT
ICHRG
10
2.8
130
200
A
%
V
mV
mA
15 %
200 mV
1.5 V
0.3 V
50 mV
60 µA
0.5 Hz
4.7 4.81
4.57
V
V
Input Voltage Operation Range
Switching Frequency
Input Voltage UVLO
Input Voltage UVLO Hysteresis
Output Voltage (VOUT)
Output Voltage Accuracy
Output Voltage Transient Response
VBAT rising
VBAT falling
Ta=25
All conditions
80mA-1A-80mA, 0.1A/us
1A-2.0A-1A, 0.1A/us
3.0 4.5 V
-15% 0.55 +15% MHz
3.3 V
400 mV
4.97 5.05 5.10 V
-3 VOUT 2
%
4.75 5.25 V
4.7 5.25 V
Output Over Voltage Protection
Output Over Voltage Protection Hysteresis
VOUT rising
VOUT falling
5.7 V
300 mV
Innovative PowerTM
- 6 - www.active-semi.com
Copyright © 2016 Active-Semi, Inc.

6 Page









ACT2802B pdf, datenblatt
ACT2802/ACT2802B/ACT2802C
Rev 7, 15-Jul-16
FUNCTIONAL DESCRIPTION
End of Charge
When charge current decreases to 15% of set fast 
charge current, the buck converter goes into end of
charge mode and keep monitoring the battery
voltage. 
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 ACT2802/ACT2802B/ACT2802C Charge States
A: PRECONDITION STATE
B: FAST-CHARGE STATE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
Figure 4.
Charger State Diagram
Innovative PowerTM
- 12 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.

12 Page





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