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I2C Programmable White LED Driver with Dual LDO

RT9367C

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The RT9367C is an integrated solution for backlighting and phone camera input supply. The part contains a charge pump white LED driver and dual low dropout linear regulators. This IC can be shutdown by pulling ENA low.
In the section of charge pump, The RT9367C can power up 4 white LEDs with regulated constant current for uniform intensity. Each channel (LED1-LED4) can support up to 25mA. The part maintains highest efficiency by utilizing a x1/x1.5/x2 fractional charge pump and low dropout current regulators. An internal 5-bit DAC is used for brightness control. Users can easily configure up to 32-step of LED current by I2C interface.
In the section of linear regulator, The RT9367C comprises a dual channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The range of output voltage can be configured from 1.1V to 3.3V by I2C interface. The outputs of LDO offer 3% accuracy and low dropout voltage of 250mV @300mA. The LDO also provides current limiting and output short circuit thermal folded back protection.

Applications

Key Spec.
RT9367C
Status Active
Vin (min) (V) 2.8
Vin (max) (V) 5.5
SW Freq (typ) (kHz) 1000
Number of LEDs (max) (pcs) 4
Iout (max)/channel (mA) 25
Iq (typ) (mA) 1;3.5
Dimming Control I2C
Topology
Features Enable Input;OCP;OVP
Package Type WQFN3x3-20
Features
  • An Integrated Solution for Backlighting and Phone Camera Input Supply
  • I2C Programmable, 32 Steps Dimming Control and Independent Channel On/Off Control
  • Over Temperature Protection
  • Power On Reset for Data Register
  • Typical 1μA Low Shutdown Current with Interface Fully On
  • Charge Pump White LED Driver
      ♦ Over 93% Peak Efficiency Over Li-ion Battery Discharge
      ♦ Typical 85% Average Efficiency Over Li-ion Battery Discharge
      ♦ Support Up to 4 White LEDs
      ♦ Output Current Up to 25mA/Channel 100mA Total
      ♦ 60mV Typical Current Source Dropout
      ♦ 1% Typical LED Current Accuracy
      ♦ 0.7% Typical LED Current Matching
      ♦ Automatic x1/x1.5/x2 Charge Pump Mode Transition
      ♦ Low Input Noise and EMI Charge Pump
      ♦ 5.5V Over Voltage Protection
      ♦ Power On/Mode Transition In-rush Protection
      ♦ 1MHz Random Frequency Oscillator
      ♦ Typical 0.1μA Low Shutdown Current
  • Dual LDO
      ♦ Wide Operating Voltage Range
      ♦ Low-Noise Output
      ♦ No Noise Bypass Capacitor Required
      ♦ Fast Response in Line/Load Transient
      ♦ Low Temperature Coefficient
      ♦ Dual LDO Outputs (300mA/300mA)
      ♦ 3% Max Output Accuracy
      ♦ Current Limit Protection
      ♦ Short Circuit Thermal Folded Back Protection
      ♦ Typical 0.1μA Low Shutdown Current
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
I2C Programmable White LED Driver with Dual LDO2008/12/02
Reliability
Title Last Update ShareDownload
I2C Programmable White LED Driver with Dual LDO 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Programmable Dual LDO Output Voltage and WLED Current with I2C Interface2017/06/08
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