RT9367C Datasheet, PDF (1/18 Pages) Richtek Technology Corporation – I2C Programmable White LED Driver with Dual LDO

RT9367C
I²C Programmable White LED Driver with Dual LDO
General Description
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.
Ordering Information
RT9367C
Package Type
QW : WQFN-20L 3x3 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
DS9367C-01 March 2011
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 1uA 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 0.1uA 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 0.1uA Low Shutdown Current
RoHS Compliant and Halogen Free
Applications
Camera Phone, Smart Phone
White LED Backlighting, CMOS Sensor Input Supply
www.richtek.com
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