LT3592

1

3592fc

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

500mA Wide Input Voltage

Range Step-Down LED Driver

with 10:1 Dimming

verter designed to operate as a constant-current source.

An external sense resistor monitors the output current

allowing accurate current regulation, ideal for driving

high current LEDs. The output current can be dimmed

by a factor of 10 using an external signal for nighttime

brake lights.

The high switching frequency offers several advantages by

permitting the use of a small inductor and small ceramic

capacitors. Small components combined with the LT3592’s

10-pin DFN leadless surface mount package save space and

cost versus alternative solutions. The constant switching

frequency combined with low-impedance ceramic capaci-

tors result in low, predictable output ripple.

A wide input voltage range of 3.6V to 36V makes the

LT3592 useful in a variety of applications. Current mode

PWM architecture provides fast transient response and

cycle-by-cycle current limiting. Thermal shutdown provides

additional protection.

50/500mA Two Series Red LED Driver

Operation from 3.6V to 36V

Frequency

Selects 10:1 Ratio

(2mm × 3mm) and MSOP-10 Packages

Efficiency for 2 Red LEDs, L = 10μH, 900kHz

10μH

51k

3592 TA01a

4.7μF

1μF

0.4Ω

10k

0.1μF

SHDN

BRIGHT

BOOST

SW

DA

CAP

OUT

LT3592

GND

ON

BRAKE

140k

900kHz

+

200/20mV

–

7V TO 32V

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

INPUT VOLTAGE (V)

4

100

95

90

60

75

70

65

80

85

55

50

20

12

24

3592 TA01b

28

16

8

BRIGHT 500mA