A4052
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
1A IS COMPATIBLE WITH THE USB INTERFACE,
LINEAR BATTERY MANAGEMENT CHIP
DETAILED INFORMATION
Application Information
Set the charge current
In constant-current mode, formula for calculating charge current: ICH = 1000V / RISET
.
H represents the charge current, units is ampere, RISET represents ISET pin to ground resistance in ohms. For
example, if you need 500mA charge current, according to the following formula: RISET = 1000V/0.5A = 2KΩ
In order to ensure good stability and temperature characteristics, RISET recommend the use of 1% precision
metal film resistors. By measuring the ISET pin voltage can be detected charge current. Charge current can
be calculated using the following formula: ICH = (VISET / RISET) × 1000
Application of USB and AC adapter while charging at the same time
A4052 can not only use USB interface to charge the battery, users can also use a wall adapter to charge the
battery. Figure 2 shows at the same time using the USB interface and the AC adapter to charge the battery
through the A4052 .when the two co-exist, the AC adapter has priority. M1 is the P-channel MOSFET, M1 is
used to prevent current from a wall adapter into the USB interface, USB interface, Schottky diode D1 prevents
the consumption of energy through the 1K resistor.
Figure 2. While using the AC adapter and USB interfaces
Battery temperature monitoring
In order to prevent the battery temperature is too high or too low, the damage caused by the battery, the
A4052 internal integrated battery temperature monitoring circuit.
REV1.0
- OCT 2013 RELEASED -
- 7 -
AITSEMI [ AiT Semiconductor ]
