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3-Channel Charge Pump White LED Driver with Low Dropout Current Source

RT9373A

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The RT9373A is a high efficiency and cost effective charge pump white LED driver. It supports up to 3 white LEDs with regulated constant current for uniform intensity. The RT9373A maintains the highest efficiency by utilizing a x1/x1.5/x2 charge pump and low dropout current regulators.
User can easily configure each LED current from 1.25mA to 20mA by a pulse dimming control. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN pin. There are totally 16 steps of current could be set by users.
RT9373A is available in a WQFN3x3-16L package.

Applications

Key Spec.
RT9373A
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 5
SW Freq (typ) (kHz) 250
Number of LEDs (max) (pcs) 3
Iout (max)/channel (mA) 20
Iq (typ) (mA) 1;2.5
Dimming Control Pulse
Features Enable Input;OVP
Package Type WQFN-3x3-16
Features
  • Very High Efficiency Over 80% of Battery Life
  • Support up to 3 White LEDs
  • Support Up to 60mA Output Current
  • 1% Typical LED Current Matching
  • Soft Start Function
  • Auto Charge Pump Mode Selection
  • 250kHz Fixed Frequency Oscillator
  • Output Over Voltage Protection
  • 16 Steps Brightness Control
  • Low Input Noise and EMI
  • RoHS Compliant and 100% Lead (Pb)-Free
Datasheet
TitleLast UpdateShareDownload
3-Channel Charge Pump White LED Driver with Low Dropout Current Source2006/11/14
Reliability
Title Last Update ShareDownload
3-Channel Charge Pump White LED Driver with Low Dropout Current Source 2015/05/19
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