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LM27952 Datasheet

Part Number LM27952
Manufacturers National Semiconductor
Logo National Semiconductor
Description White LED Adaptive 1.5X/1X Switched Capacitor Current Driver
Datasheet LM27952 DatasheetLM27952 Datasheet (PDF)

May 2005 www.DataSheet4U.com LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver General 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 .

  LM27952   LM27952






Part Number LM27952
Manufacturers Texas Instruments
Logo Texas Instruments
Description white-LED Driver
Datasheet LM27952 DatasheetLM27952 Datasheet (PDF)

LM27952 www.ti.com SNVS364B – MAY 2005 – REVISED MAY 2013 LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver Check for Samples: LM27952 FEATURES 1 •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 • 1.

  LM27952   LM27952







White LED Adaptive 1.5X/1X Switched Capacitor Current Driver

May 2005 www.DataSheet4U.com LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver LM27952 White LED Adaptive 1.5X/1X Switched Capacitor Current Driver General 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. The LM27952 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750kHz switching frequency optimized for portable applications. The LM27952 consumes less than 1µA of supply current when shut down. The LM27952 is available in a 14-pin No-Pullback Leadless Leadframe Package: LLP-14. Features n n n n n n n n n n 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 Frequen.


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