RT9535A

RT9535A High Efficiency Switching Mode Battery Charger General Description The RT9535A is a PWM switch mode battery charger controller to fast charge single or multiple Li-Ion, NiMH and NiCd batteries, using constant current or constant voltage control. Maximum current can be easily programmed by external resistor. The constant voltage output can support up to 22V with 0.5% accuracy. A third control loop limits the input current drawing from the adapter during charging. This allows simultaneous operation of the equipment and fast battery charging without over loading to the adapter. The RT9535A can charge batteries from 2.5V to 22V with dropout voltage as low as 0.4V. The RT9535A is available in the WQFN-16L 4X4 package. Features  Fast Charging for Li-Ion, NiMH and NiCd Batteries  Adjustable Battery Voltages from 2.5V to 22V  High Efficiency : Up to 95%  Charging Current Programmed by Resistor  Precision 0.5% Charging Voltage Accuracy  Provide 5% Charging Current Accuracy  500kHz Switching Frequency  Auto Shutdown with Adapter Removal Applications  Notebook Computers  Portable Instruments  Chargers for Li-lon, NiMH, NiCd and Lead Acid Rechargeable Batteries Simplified Application Circuit D4 VIN C1 R2 R1 CIN HSD EN RT9535A VIN V5V R3 R4 R5 C3 C4 C5 VFB VHH ISET VC SS GND VFB VHH NTC BOOT SW PGND SNSH SNSL BATT C2 D2 D3 To RS3 VHH R7 C6 C7 R6 RNTC R8 D1 C8 L1 RS1 RS3 RS2 CBATT RF2 RF1 VBATT To VFB Copyright © 2015 Richtek Technology Corporat...