CAT4240 Datasheet | onsemi

6 Watt Boost LED Driver Description The CAT4240 is a DC/DC step- up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1 MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. The CAT4240 high- voltage output stage is perfect for driving mid- size and large panel displays containing up to ten white LEDs in series. LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power- down mode with “zero” quiescent current. In addition to thermal protection and overload current limiting, the device also enters a very low power operating mode during “Open LED” fault conditions. The device is housed in a low profile (1 mm max height) 5- lead thin SOT23 package for space critical applications. http://onsemi. 5 1 TSOT- 23 TD SUFFIX CASE 419AE PIN CONNECTIONS 1 SW VIN Features - Switch Current Limit 750 m A - Drives High Voltage LED Strings (38 V) - Up to 94% Efficiency - Low Quiescent Ground Current 0.6 m A - 1 MHz Fixed Frequency Low Noise Operation - Soft Start “In- rush” Current Limiting - Shutdown Current Less than 1 m A - Open LED Overvoltage Protection - Automatic Shutdown at 1.9 V (UVLO) - Thermal Overload Protection - Thin SOT23 5- lead (1 mm Max Height) - These Devices are Pb- Free, Halogen Free/BFR Free and are Ro HS pliant Applications - GPS Navigation Systems - Portable Media Players - Handheld Devices, Digital Cameras GND FB (Top View) SHDN MARKING...