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PDF ACT2802C Data sheet ( Hoja de datos )
| Número de pieza | ACT2802C | |
| Descripción | 5V/2.5A Backup Battery Pack Manager | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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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)
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
1 page  
ACT2802/ACT2802B/ACT2802C
Rev 7, 15-Jul-16
ELECTRICAL CHARACTERISTICS
(VIN = 5V, TA = 25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
Input Current Limit
Input Voltage Range
VIN Over Voltage Protection
VIN rising, VIN_OVP
Input Voltage Validation Time
VIN_UVLO<VIN<VIN_OVP
Input Current Limit Setting Range
RILIM=0.806kΩ—2.4kΩ
Input Current Limit
RILIM=0.806kΩ
Input Current Limit Gain
Leakage Current from VOUT to VIN in Boost
Mode
3.0V<VBAT<4.35V, Ta=25℃
Battery Discharge Current in High-Z Mode 3.0V<VBAT<4.35V, Ta=25℃
Power Switches
VIN-to-VOUT FET on Resistance
VOUT-to-SW FET on Resistance
SW-to-PGND FET on Resistance
Buck Converter
Switching Frequency
High Side Switch Peak Current Limit
Minimum On-time
Over Temperature Protection (OTP)
OTP Hysteresis
OTP rising
OTP falling
Charge Mode
Charge Current Setting Range
Charge Current Setting (ICHRG)
Thermal Regulation Temperature
Battery Adjust Voltage(VBAJ)
End of Charge (EOC) Voltage
Rcs=25mΩ, RICST=20kΩ—50kΩ
Rcs=25mΩ, RICST=43.2kΩ
Rbtv=25kΩ
EOC Voltage Accuracy
Battery Over Voltage Threshold
Battery Over Voltage Threshold Hysteresis
Rbtv=0
VBAT rising
VBAT falling
MIN TYP MAX UNIT
4.5 5.5 V
5.5 6.0 6.5 V
32 ms
1.0 3.0 A
3.0 A
2000
0 10 µA
7.5 15 µA
80 mΩ
60 mΩ
65 mΩ
-15%
4.5
1.1 +15% MHz
6A
100 ns
160 ℃
35 ℃
1.0 2.5 A
2.1 A
110 ℃
0.1 V
-0.5% 4.1+VBAJ 0.5% V
4.1 V
4.6 V
200 mV
Innovative PowerTM
- 5 - www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
5 Page 
ACT2802/ACT2802B/ACT2802C
Rev 7, 15-Jul-16
FUNCTIONAL DESCRIPTION
Figure 2:
ACT2802B/ACT2802C System Operation Flow Chart
Latch-Off
ACT2802/ACT2802B/ACT2802C has latch off
function. If discharging stops due to battery cut-off,
and latch off will be triggered, it would prevent
battery from discharging again, latch-off is released
when input power is recycled.
Input Current Limit
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.
Switching Battery Charger
ACT2802/ACT2802B/ACT2802C 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
There are CC/CV regulation loops built in ACT2802/
ACT2802B/ACT2802C, 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.
Precondition Charge
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
at a reduced current, 10% of the programmed
maximum fast charge constant current. Once VBAT
reaches the precondition threshold voltage the state
machine jumps to the fast charge state.
Fast Charge
If battery voltage is above preconditioning
threshold, buck converter charges battery with
constant current. In fast charge state, the ACT2802/
ACT2802B/ACT2802C 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 ACT2802/
ACT2802B/ACT2802C charges in top off state.
Top Off
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 15%
of fast charge current. When this happens, the state
machine terminates the charge cycle and jumps to
the EOC state.
Innovative PowerTM
- 11 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ACT2802C.PDF ] | |
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