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RT9538

Richtek Technology
Part Number RT9538
Manufacturer Richtek Technology
Description High Efficiency Switching Mode Battery Charger
Published May 27, 2016
Detailed Description ® RT9538 High Efficiency Switching Mode Battery Charger General Description The RT9538 is a PWM switch mode battery ch...
Datasheet PDF File RT9538 PDF File

RT9538
RT9538

Overview
® RT9538 High Efficiency Switching Mode Battery Charger General Description The RT9538 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 adjusted by an external resistor.
The constant voltage output can support up to 30V 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 RT9538 can charge batteries from 2.
5V to 25V with dropout voltage as low as 2V.
A diode is not required in series with the battery because the charger automatically enters a 10μA sleep mode when the adapter is unplugged.
A logic output indicates Li-ion full charge when current drops to 20% of the full-scale adjusted charge current.
Marking Information 1C= : Product Code 1C=YM DNN YMDNN : Date Code Features  Fast Charging for Li-ion, NiMH and NiCd Batteries  Adjustable Battery Voltages from 2.
5V to 25V  High Efficiency : Up to 95%  Charging Current Adjusted by Resistor  Precision 0.
5% Charging Voltage Accuracy  Provide 5% Charging Current Accuracy  Input Current Limit Maximizes Charging Rate  475kHz Switching Frequency  Flag Indicates Li-ion Charge Completion  Auto Shutdown with Adapter Removal  Only 10μA Battery Drain When Idle  Available in an 16-Lead WQFN Package  RoHS Compliant and Halogen Free Applications  Notebook Computers  Portable Instruments  Chargers for Li-ion, NiMH, NiCd and Lead Acid  Rechargeable Batteries Simplified Application Circuit VIN CIN M1 RS4 C1 R2 C2 RT9538 ACN V5V R1 ACP R3 Option C3 Option R4 R5 C4 C5 VFB Option ACDRV BOOT EN VIN ISET VC TG SW STATUS VFB SNSH GND SNSL BATT To System Power D2 C7 R7 R6 M2 C8 L1 D1 C9 RS1 RS3 RS2 RF2 VBATT CBATT To VFB RF1 Copyright ©2017 Richtek Technology Corporation.
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