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PDF LM2791 Data sheet ( Hoja de datos )
| Número de pieza | LM2791 | |
| Descripción | Current Regulated Switched Capacitor LED Driver with Analog Brightness Control | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2002
LM2791
Current Regulated Switched Capacitor LED Driver with
Analog Brightness Control
General Description
The LM2791 is a CMOS charge-pump voltage doubler and
regulator that provides two regulated current sources. The
LM2791 is designed to drive two white (or blue) LEDs with
matched currents (within ± 0.3%) to produce balanced light
sources for display backlights. They accept an input voltage
range from 3V to 5.8V and maintain a constant current
determined by an external set resistor.
The LM2791 delivers up to 36mA of load current to accom-
modate two high forward voltage (typically white) LEDs. The
switching frequency is 450kHz (min.) to keep the conducted
noise spectrum away from sensitive frequencies within por-
table RF devices.
In the LM2791, brightness is controlled by applying a voltage
between GND and 3.0V to the BRGT pin. The LM2791 is
available in active high or low shutdown versions. The shut-
down pin reduces the operating current to 1µA (max.).
The LM2791 is available in a 10 pin leadless leadframe
(LLP) CSP package.
Features
n Output matching of ± 0.3%
n Drives up to two LED’s
n 3V to 5.8V Input Voltage
n Up to 36mA output current
n Soft start limits inrush current
n Analog brightness control
n Separate shutdown input
n Very small solution size - no inductor
n 0.7mA typical operating current
n 1µA (max.) shutdown current
n 450kHz switching frequency (min.)
n Linear regulation generates predictable noise spectrum
n LLP-10 package: 3mm X 3mm X 0.8mm
Applications
n White LED Display Backlights
n White LED Keypad Backlights
n 1-Cell Li-Ion battery-operated equipment including
PDAs, hand-held PCs, cellular phones
n Flat Panel Dispalys
Basic Application Circuit
© 2002 National Semiconductor Corporation DS200183
20018301
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified, C1 = CIN, CHOLD= 1uF, VIN= 3.6V,
VDIODE = 3.6V, BRGT pin =0V, RSET = 330Ω
Supply Current at No Load
Supply Current vs Supply Voltage
SD-Threshold
20018305
IDIODE vs VDIODE
20018312
20018308
Diode Current vs. Temperature
IDIODE vs RSet
20018310
20018320
5
20018311
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
LLP-10 Pin Package (LDA)
For Ordering, Refer to Ordering Information Table
NS Package Number LDA10A
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.
National Semiconductor
Corporation
Americas
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
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.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM2791.PDF ] | |
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