ZXSC380 Datasheet | Zetex Semiconductors

Description The ZXSC380 is a highly integrated single or multi cell LED driver for applications where step-up voltage conversion from a very low input voltage is required. These applications mainly operate from 1.5V or 1.2V cells. The IC generates constant current pulses that are ideal for driving single or multiple LEDs over a wide range of operating voltages. The ZXSC380 provides a simple to use, low cost, space saving and easy to layout solutions. The ZXSC380 uses a PFM control technique to drive an internal switching transistor which has a low saturation resistance. This ensures high efficiency, even for input voltages as low as 1V. The IC can start up under full load and operates down to an input voltage of only 0.9V typical. The ZXSC380 is offered in the space saving SOT23 package or in die form, offering an excellent cost vs performance solution for single cell LED driving applications. SOT23 Features .. Applications - - - LED flashlights and torches LED backlights White LED driver - - - - - - - - 80% efficiency User adjustable output current Single cell operation Low saturation voltage switching transistor Simple application circuit Low external ponent count SOT23 package Available also in die form Pin connections VCC 1 Typical application circuit L1 Vcc ZXSC380 Vout 3 GND 3 VOUT GND 2 Top view LED1 Issue 1 - March 2007 © Zetex Semiconductors plc 2007 .zetex. Absolute maximum ratings Supply voltage (VCC) Output voltage (VOUT) Supply current Output switch current Power dissipation SOT23-3 Power dissipation die Operating temperature range Storage temperature range -0.6V to 10V -0.6V to 20V 20m A 200m A 450m W 1W 0°C to +85°C -55°C to +150°C Electrical characteristics Measured at Tamb = 25°C, L = 100␮H and VCC = 1.5V unless otherwise specified. Parameter Supply voltage operating range Minimum supply start-up voltage Switch current Switch saturation voltage Mean LED current Efficiency Operating frequency Discharge pulse width...