LM2791LD-L PDF даташит
Спецификация LM2791LD-L изготовлена «National Semiconductor» и имеет функцию, называемую «Current Regulated Switched Capacitor LED Driver with Analog Brightness Control». |
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Детали детали
Номер произв | LM2791LD-L |
Описание | Current Regulated Switched Capacitor LED Driver with Analog Brightness Control |
Производители | National Semiconductor |
логотип |
11 Pages
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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
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Connection Diagram
Ordering Information
Order Number
Shutdown Polarity
LM2791LD-L
LM2791LDX-L
LM2791LD-H
LM2791LDX-H
Active Low
Active Low
Active High
Active High
Top View
10-Lead LLP
NSC Package
Drawing
LLP-10
LLP-10
LLP-10
LLP-10
20018303
Package
Marking
SNB
SNB
SLB
SLB
Supplied As
1000 Units, Tape and Reel
4500 Units, Tape and Reel
1000 Units, Tape and Reel
4500 Units, Tape and Reel
www.national.com
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Pin Description
Pin Name
1 BRGT
2 POUT
3 C1−
4 C1+
5 D2
6 D1
7 GND
8 VIN
9 SD/SD
10 ISET
Block Diagram
Function
Variable voltage input controls output current.
Charge pump output.
Connect this pin to the negative terminal of C1.
Connect this pin to the positive terminal of C1.
Current source outputs. Connect directly to LED.
Current source outputs. Connect directly to LED.
Power supply ground input.
Power supply voltage input.
Shutdown input. Device operation is inhibited when pin is asserted.
Current Sense Input. Connect resistor to ground to set constant current through LED.
20018302
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Номер в каталоге | Описание | Производители |
LM2791LD-H | Current Regulated Switched Capacitor LED Driver with Analog Brightness Control | National Semiconductor |
LM2791LD-L | Current Regulated Switched Capacitor LED Driver with Analog Brightness Control | National Semiconductor |
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