LT3596



3596f

Typical applicaTion

FeaTures

DescripTion

60V Step-Down LED Driver

10,000:1 digital PWM dimming at 100Hz with fast NPN

current sources driving up to 10 LEDs in each channel.

100:1 LED dimming can also be done with analog control

of the CTRL1-3 pin.

The step-down switching frequency is programmable

between 200kHz and 1MHz and is synchronizable to an

external clock. The LT3596 also provides maximum LED

brightness while adhering to manufacturers’ specifica-

tions for thermal derating. The derate temperature is

programmedbyplacinganegativetemperaturecoefficient

(NTC) resistor on the master control pin.

optimalefficiency.Otherfeaturesinclude:1.5%LEDcurrent

matching between channels, open LED reporting, shorted

LED pin protection and reporting, programmable LED cur-

rent and programmable temperature protection.

48V 1MHz Step-Down 8W, 100mA LED Driver (Eight White LEDs per Channel)

applicaTions

n

300mA Buck Regulator, Drives Up to 10 LEDs per

Channel with Fast NPN Current Sources

n

Fast Current Sources for <1µs Pulse Widths

(10,000:1 True Color PWM™ Dimming at 100Hz)

n

LEDs Disconnected in Shutdown

n

n

6V to 60V Input Voltage Range

n

±1.5% Accurate LED Current Matching

n

External Resistors Set LED Current for Each Channel

n

Requires No External Compensation

n

ProgrammableSwitchingFrequency(200kHzto1MHz)

n

Synchronizable to External Clock

n

Open, Short LED Detection and Reporting

n

Programmable LED Thermal Derating and Reporting

n

Programmable Temperature Protection

n

5mm

× 8mm Thermally Enhanced QFN Package with

0.6mm High Voltage Pin Spacing

n

LED Billboards and Signboards

n

Mono, Multi, Full Color LED Displays

n

Large Screen Display LED Backlighting

n

Automotive, Industrial and Medical Displays

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation and True Color PWM is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

EN/UVLO

LT3596

SYNC

SYNC

PWM1

PWM2

PWM3

PWM1

PWM2

PWM3

CTRL1

CTRL2

CTRL3

CTRL1

CTRL2

CTRL3

RT

FAULT

FAULT

BIAS

270k

10µF

48V

91k

33.2k

TSET

CTRLM

10k

90.9k

49.9k

20k

20k

20k

3696 TA01a

100k

100k

BIAS

BOOST

SW

DA

GND

FB

LED1

LED2

LED3

4.7µF

5V

BIAS

4.7µF

100nF

100k

3.65k

100µH

10,000:1 PWM Dimming at 100Hz

PWM

2V/DIV

50mA/DIV

200ns/DIV

3596 TA01b