A4052
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
1A IS COMPATIBLE WITH THE USB INTERFACE,
LINEAR BATTERY MANAGEMENT CHIP
PIN DESCRIPTION
Top View
Pin #
1,8
Symbol
Function
NC
No Connect
Charge current programming, charge current monitoring and close pin. Charge current
is controlled by a resistor of precision of 1% to the ground. In the constant charge
current state, this port provides 1V voltage. In all conditions, this port charge current
can be calculated using the following formula:
IBAT = (VISET/RISET) ×1000
2
ISET
ISET port can also be used to turn off the charger. Resistance to side with the
separation of programming can pull the 3uA current source to increase ISET port
voltage. When the suspension reached the limit voltage 1.21V, the device enters stop
state, after charging the input current drop to 25A. This port pinch-off voltage is about
2.4V. If supply this port voltage more than pinch-off voltage, the current will be 1.5mA.
Through combinating ISET pin to the ground, the charger will back to normal.
Ground terminal, The EXPOSED pin is also connected with pin 3.
3
4
GND
VIN
Supply positive input voltage. Power supply for the charger. VCC can be 4.25V to 6.5V
and must have at least 1F bypass capacitor. If the BAT pin voltage of VCC down to
within 30 mV, A4052 into the suspension state, and make BAT Current less than 2A.
Make the battery's positive terminal connected to this pin. When the power supply
voltage lower than the threshold latch voltage or sleep mode voltage, BAT pin current
is less than 2μA. BAT pin provide the battery charge current and constant voltage
charging voltage.
5
BAT
When charging end, DONE pin is pulled low by internal switch represents that charge
has ended; otherwise DONE pin is high impedance state.
6
7
DONE
CHRG
When the charger to the battery charging, CHRG pin is pulled low by the internal
switch, represents charging being; otherwise CHRG pin is in high impedance state.
REV1.0
- OCT 2013 RELEASED -
- 2 -
AITSEMI [ AiT Semiconductor ]
