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LP28400ABSPF Datasheet(PDF) 7 Page - Lowpower Semiconductor inc |
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LP28400ABSPF Datasheet(HTML) 7 Page - Lowpower Semiconductor inc |
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7 / 10 page  LP28400A – 02 Sep.-2016 Email: marketing@lowpowersemi.com www.lowpowersemi.com Page 7 of 10 Preliminary Datasheet LP28400A Function Description LP28400A is a wide range VIN(3V-12V), 1.5A two-cell asynchronous boost Li-Ion battery charger integrates 1MHz switching frequency and full protection functions. The charge current up to 1.5A can be programmed by using the external resistor for different portable applications and indicates the charger current information simultaneous. It also has an adaptive input current limit for safety battery charge operation. It consists of 18V rating FETs with extremely low ON resistance to achieve high charge efficiency and simple peripheral circuit design. Battery Charge Mode If the plug in input voltage VIN is higher than VBAT, the switching block will stop work to keep LX pin in high resistance and PB will control the external PMOS` VGS to match the battery voltage. Under this condition, the Boost charger function stops work and regulates the external FET works in linear charge mode. Whether the circuit work in Boost mode or Linear mode, the constant charge current is programmed by Rsense with: SENSE RSENSE R V BAT I Which VRSENSE=50mV The circuit would work in trickle charge mode when battery voltage below 6V with VRSENSE=10mV. The terminal charge current would be programmed by VRSENSE=5mV. During the charging mode, constant (trickle) charging current loop is active first. When VBAT equals to constant voltage threshold, constant voltage loop takes over and pull down the charging current. When IBAT is lower than the termination current threshold ITERM, the main FET of boost charger is turned off firstly. External PMOS are turned off when the current is down to zero. Then, LP28400A is waiting for recharge mode. Input Source Qualification After REGN amplifier powers up, the LP28400A checks the current capability of the input source. The input source has to meet the VREG>1V to enable the chip. Number of Charge Cell Selection (QFN-16) The number of charge cell can be programmed by changing the connection of CELLS Pin (QFN-16 package only). Connect CELLS Pin to GND is provide for 3 cells charging, leave floating for 2 cells, and connect to VL for 4 cells. CELLS Pin Connected Charge Cells Floating(No connected) 2 GND 3 VL 4 |
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