LM2791 datasheet(4/18 Pages) TI1

No. de pieza	LM2791

Descripción Electrónicos	LM2791 Current Regulated Switched Capacitor LED Driver with Analog Brightness Control

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Fabricante Electrónico	TI1 [Texas Instruments]

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LM2791

SNVS156M – FEBRUARY 2001 – REVISED MAY 2013

www.ti.com

Electrical Characteristics

(1)

Limits in standard typeface are for TJ = 25°C and limits in boldface type apply over the full Operating Temperature Range.

Unless otherwise specified, C1 = CIN = CHOLD = 1 µF, VIN = 3.6V, VDIODE = 3.6V, RSET = 332Ω, BRGT pin = 0V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

IDX

Diode Current at ID1,2

VIN= 3V, RSET = 270Ω

16.5

18

Available Current at Output Dx

VIN= 3V

14.5

VIN= 3.3V

12.8

15.1

17.7

mA

VIN= 3.6V

13.3

15.7

18.4

VIN = 4.4V

16.8

IDx

Load Regulation at Output Dx

VIN =3.6V

16

VDX=3.0V

mA

15.4

VDX=4.0V

IDX

Line Regulation of Dx Output

3.3V

≤ VIN ≤ 4.4V

15.7

mA

Current

VDX = 3.6V

ID-MATCH

Current Matching Between Any

3.0V

≤ VIN ≤ 4.4V

0.3

%

Two Outputs

VD1, VD2 = 3.6V

IQ

Quiescent Supply Current

3.0V

≤ VIN ≤ 4.4V, Active, No Load

0.7

2

mA

Current

ISD

Shutdown Supply Current

3.0V

≤ VIN ≤ 5.5V, Shutdown at

0.1

1

µA

85°C

0.3

VIH

SD Input Logic High

3.0V

≤ VIN ≤ 5.5V,

(2)

0.8VIN

V

VIL

SD Input Logic Low

3.0V

≤ VIN ≤ 5.5V,

(2)

0.2VIN

V

ILEAK-SD

SD Input Leakage Current

0V

≤ VSD ≤ VIN

0.1

µA

RBRGT

BRGT Input Resistance

250

k

Ω

ISET

ISET Pin Output Current

IDx/25

mA

fSW

Switching Frequency (3)

3.0V

≤ VIN ≤ 4.4V

450

650

850

kHz

tSTART

Startup Time(4)

IDx = 90% steady state

10

µs

(1)

In the test circuit, all capacitors are 1.0µF, 0.3

Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance,

reduce output voltage and efficiency.

(2)

The internal thresholds of the shutdown bar are set at about 40% of VIN.

(3)

The output switches operate at one half of the oscillator frequency, fOSC = 2fSW.

(4)

Specified by design.Not productin tested.

4

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Not Recommended For New Designs

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