1FEATURES
2• Drives up to 4 LEDs with up to 30mA each
• Regulated current sources with 0.2%(typ.)
matching
• 3/2x, 1x Gain transition based on LED VF
• Peak Efficiency Over 85%
• Input Voltage Range: 3.0V to 5.5V
• PWM Brightness Control
• Very Small Solution Size - NO INDUCTOR
• Fixed 750kHz Switching Frequency
• <1μA Shutdown Current
• 14-pin WSON Package: 4.0mm X 3.0mm X
0.8mm

APPLICATIONS
• White LED Display Backlights
• White LED Keypad Backlights
• General Purpose LED Lighting

DESCRIPTION
The LM27952 is a switched capacitor white-LED
driver capable of driving up to 4 LEDs with 30mA
through each LED. Its 4 tightly regulated current sinks
ensure excellent LED current and brightness
matching. LED drive current is programmed by an
external sense resistor. The LM27952 operates over
an input voltage range from 3.0V to 5.5V and requires
only four low-cost ceramic capacitors.
The LM27952 provides excellent efficiency without
the use of an inductor by operating the charge pump
in a gain of 3/2, or in a gain of 1. Maximum efficiency
is achieved over the input voltage range by actively
selecting the proper gain based on the LED forward
voltage requirements.