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LM27952SD Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM27952SD
Descripción Electrónicos  White LED Adaptive 1.5X/1X Switched Capacitor Current Driver
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM27952SD Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM27952
White LED Adaptive 1.5X/1X Switched Capacitor Current
Driver
General Description
The LM27952 is a switched capacitor white-LED driver ca-
pable 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 pro-
grammed by an external sense resistor. The LM27952 oper-
ates 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
Drives up to 4 LEDs with up to 30mA each
n
Regulated current sources with 0.2%(typ.) matching
n
3/2x, 1x Gain transition based on LED V
F
n
Peak Efficiency Over 85%
n
Input Voltage Range: 3.0V to 5.5V
n
PWM Brightness Control
n
Very Small Solution Size - NO INDUCTOR
n
Fixed 750kHz Switching Frequency
n <
1µA Shutdown Current
n
14-pin LLP Package: 4.0mm X 3.0mm X 0.8mm
Applications
n
White LED Display Backlights
n
White LED Keypad Backlights
n
General Purpose LED Lighting
Typical Application Circuit
20148001
May 2005
© 2005 National Semiconductor Corporation
DS201480
www.national.com


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