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PDF LM2751 Data sheet ( Hoja de datos )

Número de pieza LM2751
Descripción Capacitor White LED Driver
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM2751 Hoja de datos, Descripción, Manual

April 2005
LM2751
Regulated 2X, 1.5X Switched Capacitor White LED Driver
www.datashGeete4un.ceomral Description
The LM2751 is a constant frequency switched capacitor
charge pump with regulated output voltage options of 4.5V,
and 5.0V. Over the input voltage range of 2.8V to 5.5V the
LM2751 provides up to 150mA of output current and requires
only four low-cost ceramic capacitors.
The LM2751 provides excellent efficiency without the use of
an inductor by operating the charge pump in a gain of 3/2 or
2. The proper gain for maintaining regulation is chosen so
that efficiency is maximized over the input voltage range.
LM2751 uses constant frequency pre-regulation to minimize
conducted noise on the input and provide a predictable
switching frequency. The switching frequency is program-
mable to 725kHz, 300kHz, 37kHz, or 9.5kHz.
LM2751 is available in a 10-pin Leadless Leadframe No-
Pullback Package: LLP-10.
Features
n Regulated Output Options: 4.5V, 5.0V
n Output Voltage Regulated within 3%
n Peak Efficiency Over 90%
n 150mA (4.5V) or 80mA (5.0V) Output Current Capability
n Input Voltage Range: 2.8V to 5.5V
n Low Input and Output Voltage Ripple
n <1µA Typical Shutdown Current
n Small Solution Size - NO INDUCTOR
n Programmable 725kHz, 300kHz, 37kHz, or 9.5kHz
Switching Frequencies
n 10-pin LLP No-Pullback Package: 3mm x 3mm x 0.8mm
Applications
n White LED Display Backlights
n White LED Keypad Backlights
n General Purpose 2x, 1.5x Regulated Charge Pump
Typical Application Circuit
LM2751 2x/1.5x Efficiency vs.
2x Charge Pump Effciency
20112101
© 2005 National Semiconductor Corporation DS201121
20112128
www.national.com

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LM2751 pdf
Block Diagram
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20112103
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LM2751 arduino
Physical Dimensions inches (millimeters) unless otherwise noted
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10-Pin LLP
NS Package Number SDA10A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
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