Features

• Low Quiescent Current: 26µA at 12V_IN to 3.3V_OUT
• Integrated Boost and Catch Diodes
• Input Range: 4V to 40V
• Low Output Ripple: <10mV
• <1µA in Shutdown Mode
• Output Voltage: 1.25V to 16V
• 200mA Output Current
• Hysteretic Mode Control
  – Low Ripple Burst Mode® Operation at Light Loads
  – Continuous Operation at Higher Loads
• Solution Size as Small as 50mm²
• Low Profile (0.75mm) 3mm x 2mm Thermally Enhanced 8-Lead DD and 1mm ThinSOT Packages

Typical Application

Description

The LT3470 is a micropower step-down DC/DC converter that integrates a 300mA power switch, catch diode and boost diode into low profile 3mm x 2mm DD and ThinSOT packages. The LT3470 combines Burst Mode and continuous operation to allow the use of tiny inductor and capacitors while providing a low ripple output to loads of up to 200mA.

With its wide input range of 4V to 40V, the LT3470 can regulate a wide variety of power sources, from 2-cell Li-Ion batteries to unregulated wall transformers and leadacid batteries. Quiescent current in regulation is just 26µA in a typical application while a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Fast current limiting and hysteretic control protects the LT3470 and external components against shorted outputs, even at 40V input.