Description
The ZXLD1321 is an inductive DC-DC converter, with an internal switch, designed for driving single or multiple LEDs in series up to a total of 1A output current.
Applications cover commercial environments with input voltages ranging from 1.2V to 12V.
The device employs a variable 'on' and 'off' time control scheme with adjustable peak switch current limiting and supports step-up (Boost) mode and self-powering Bootstrap operating modes, offering higher power efficiency and lower system cost than conventional PFM circuitry.

FEATUREs
• 1.2V to 12V Input voltage range
• Up to 1A output current
• Typical efficiency# >85%
• Bootstrap operation enables input voltage down to 1V
• User-defined thermal control of LED output current using external thermistor
• High output current stability over input voltage and temperature
• 12µA typical standby current
• LED current adjustable from 100% down to 2%
• Adjustable soft-start
• Drives up to 5 white LEDs in series

APPLICATIONs
• High power LED flashlights
• LED back-up lighting
• General LED lighting
• Emergency lighting