60V LED Driver with 4A Switch Current

The LT3952A is a current mode step-up DC/DC converter with an internal, 60V, 80mΩ DMOS power switch. The LT3952A is specifically designed to drive high power LEDs in multiple configurations. It combines input and output current regulation loops with output voltage regulation to operate as a flexible current/voltage source.

Programmable switching frequency with optional spread-spectrum modulation provides EMI reduction, while still allowing optimization of the external components for efficiency or component size. The LED current is programmable with an external sense resistor, and can be adjusted from zero to full scale with a voltage at the CTRL pin. The external PWM input provides LED ON/OFF control and 4000:1 dimming ratio, and an internal PWM generator delivers the efficiency of PWM dimming to standalone or I/O limited applications. The LT3952A is available in the thermally enhanced 28-lead TSSOP package.

Applications

* Display Backlighting

* Automotive and Avionic Lighting

* Accurate Current-Limited Voltage Regulators

* 4000:1 True Color PWM™ Dimming

* 4A, 60V Internal DMOS Switch

* Wide Input Voltage Range: 3V to 42V

* 0V to 60V Output Current Regulation with Monitor

* PMOS Switch Driver for PWM and Output Disconnect

* LED Short-Circuit Protection and SHORTLED Flag

* Internal Spread Spectrum Frequency Modulation

* Constant-Current and Constant-Voltage Regulation