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 lead- acid 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, simpli- fying power management in battery-powered systems.
The LT3470 is a micropower buck regulator that integrates a 300 mA power switch, boost and catch diodes in a 3 mm × 2 mm DD or ThinSOT package. It offers a wide 4 V‑40 V input range, low quiescent current (26 µA) and low output ripple (<10 mV) while delivering up to 200 mA at adjustable output voltages from 1.25 V to 16 V.
Typical applications include automotive battery regulation, portable product power supplies, wall‑transformer regulation and industrial supplies. The device features hysteretic control with Burst‑Mode operation for light loads and continuous mode for higher loads, and includes a shutdown pin for ultra‑low‑power standby.
| Input Voltage Range | 4 V to 40 V |
|---|---|
| Output Voltage Range | 1.25 V to 16 V |
| Maximum Output Current | 200 mA |
| Quiescent Current (Regulation) | 26 µA |
| Output Ripple | <10 mV |
| Operating Temperature Range (LT3470H) | –40 °C to 150 °C |
Tie the SHDN pin to ground to put the LT3470 into shutdown mode; applying 2 V or more enables normal operation.
The device draws only 26 µA of quiescent current when regulating (e.g., 12 V IN to 3.3 V OUT).