LM2794/95

C1+

GND

BRGT

D1

D2

C1-

SD

1PF

C2-

C1

1PF

C2

1PF

1PF

D3

D4

C2+

LED2

LED1

LED3

LED4

LM2794, LM2795

www.ti.com

SNVS168L – JANUARY 2002 – REVISED MAY 2013

LM2794 /LM2795 Current Regulated Switched Capacitor LED Supply with Analog and

PWM Brightness Control

Check for Samples: LM2794, LM2795

1

FEATURES

APPLICATIONS

2

•

Regulated Current Sources with ±0.5%

•

White LED Display Backlights

Matching between any Two Outputs

•

White LED Keypad Backlights

•

High Efficiency 3/2 Boost Function

•

1-Cell Li-Ion Battery-Operated Equipment

•

Drives One, Two, Three or four White LEDs

Including PDAs, Hand-Held PCs, Cellular

Phones

•

2.7V to 5.5V Input Voltage

•

Up to 80mA Output Current

DESCRIPTION

•

Analog Brightness Control

The LM2794/95 is a fractional CMOS charge-pump

•

Active-Low or High Shutdown Input ('94/95)

that provides four regulated current sources. It

accepts an input voltage range from 2.7V to 5.5V and

•

Very Small Solution Size and no Inductor

maintains a constant current determined by an

•

2.3µA (typ.) Shutdown Current

external sense resistor.

•

325kHz Switching Frequency (min.)

The LM2794/5 delivers up to 80mA of load current to

•

Constant Frequency Generates Predictable

accommodate

four

White

LEDs.

The

switching

Noise Spectrum

frequency is 325kHz. (min.) to keep the conducted

•

Thin DSBGA Package: 2.08mm X 2.403mm X

noise spectrum away from sensitive frequencies

0.600mm High

within portable RF devices.

Basic Application Circuit

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2002–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.