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PDF LM27953 Data sheet ( Hoja de datos )
| Número de pieza | LM27953 | |
| Descripción | White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 2004
www.DataSheet4U.com
LM27953
White LED Driver with Four LED Current Sinks and 3/2x
Switched Capacitor Boost
General Description
The LM27953 is a charge-pump-based white-LED driver that
is ideal for mobile phone display backlighting. It is intended
to drive 4 LEDs for a main phone display backlight. Regu-
lated internal current sources deliver excellent current and
brightness matching in all LEDs.
The LED driver current sinks can be used to backlight a main
phone display with up to 4 LEDs. The low-side current
drivers accommodate common-anode-type LEDs. The cur-
rent sinks can also drive standard two-terminal LEDs, and
provide other general lighting functions (keypad lighting, fun
lighting, etc). The brightness of the LEDs can be adjusted
independently with an external resistor.
The LM27953 works off an extended Li-Ion input voltage
range (2.7V to 5.5V). Voltage boost is achieved with a high-
efficiency 3/2x-gain charge pump.
The LM27953 is available in National’s chip-scale 18-bump
micro SMD package.
Features
n Drives 4 Individual Common-Anode LEDs with up to
20mA each for a Main Display Backlight
n Independent Resistor-Programmable Current Setting
n Excellent Current and Brightness Matching
n High-Efficiency 3/2x Charge Pump
n Extended Li-Ion Input: 2.7V to 5.5V
n PWM Brightness Control: 100Hz - 1kHz
n 18-bump Thin Micro SMD Package:
(2.1mm x 2.4mm x 0.6mm)
Applications
n Mobile Phone Display Lighting
n Mobile Phone Keypad Lighting
n PDAs
n General LED Lighting
Typical Application Circuit
© 2004 National Semiconductor Corporation DS201280
20128001
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified: VIN = 3.6V; VLED = 3.6V; EN =
VIN; RSET = 8.35kΩ; CIN, C1, C2 , and CPOUT = 1µF.
www.DataSheet4U.com
LED Current (D1, D2,D3, D4)
vs. Input Voltage
LED Current (Dx) vs. Input Voltage
20128004
Quiescent Current vs. Input Voltage,
20128005
Charge Pump Output Voltage
vs. Output Current
20128006
20128007
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
www.DataSheet4U.com
TLA18EHA: 18-Bump Thin Micro SMD, Large Bump
X1 = 2.098 ± 0.030mm
X2 = 2.403mm ± 0.030
X3 = 0.600mm ± 0.075mm
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.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor certifies that the products and packing materials 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.
National Semiconductor
Americas Customer
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
National Semiconductor
Europe Customer Support Center
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
Support Center
Email: [email protected]
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: [email protected]
Tel: 81-3-5639-7560
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM27953.PDF ] | |
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