Datasheet LT3596 (Analog Devices)

LT3596 60V Step-Down LED Driver FeaTures DescripTion n
300mA Buck Regulator, Drives Up to 10 LEDs per
The LT®3596 is a 60V step-down LED Driver. It achieves
Channel with Fast NPN Current Sources
10,000:1 digital PWM dimming at 100Hz with fast NPN n
Fast Current Sources for <1µs Pulse Widths
current sources driving up to 10 LEDs in each channel.
(10,000:1 True Color PWM™ Dimming at 100Hz)
100:1 LED dimming can also be done with analog control n
LEDs Disconnected in Shutdown
of the CTRL1-3 pin. n
Adaptive VOUT for Increased Efficiency
The step-down switching frequency is programmable n
6V to 60V Input Voltage Range
between 200kHz and 1MHz and is synchronizable to an n ±1.5% Accurate LED Current Matching external clock. The LT3596 also provides maximum LED n External Resistors Set LED Current for Each Channel brightness while adhering to manufacturers’ specifica- n Requires No External Compensation tions for thermal derating. The derate temperature is n Programmable Switching Frequency (200kHz to 1MHz) programmed by placing a negative temperature coefficient n Synchronizable to External Clock (NTC) resistor on the master control pin. n Open, Short LED Detection and Reporting n Programmable LED Thermal Derating and Reporting The LT3596 adaptively controls VOUT in order to achieve n Programmable Temperature Protection optimal efficiency. Other features include: 1.5% LED current n 5mm × 8mm Thermally Enhanced QFN Package with matching between channels, open LED reporting, shorted 0.6mm High Voltage Pin Spacing LED pin protection and reporting, programmable LED cur- rent and programmable temperature protection. applicaTions 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. n LED Billboards and Signboards All other trademarks are the property of their respective owners. n Mono, Multi, Full Color LED Displays n Large Screen Display LED Backlighting n Automotive, Industrial and Medical Displays Typical applicaTion
48V 1MHz Step-Down 8W, 100mA LED Driver (Eight White LEDs per Channel)
VIN V 5V IN 48V BIAS BIAS 10µF 270k 4.7µF EN/UVLO BOOST 100nF 100µH 91k SW VOUT
10,000:1 PWM Dimming at 100Hz
LT3596 4.7µF 100k SYNC SYNC DA RT GND 33.2k 3.65k FB z PWM PER LED 2V/DIV PWM1 PWM1 VOUT STRING PWM2 PWM2 PWM3 PWM3 CTRL1 CTRL1 CTRL2 CTRL2 ILED CTRL3 CTRL3 50mA/DIV BIAS LED1 100k LED2 FAULT FAULT LED3 VREF 3696 TA01a 200ns/DIV 3596 TA01b 90.9k 10k ISET1 TSET ISET2 CTRLM ISET3 49.9k 100k 20k 20k 20k 3596fa Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts