The LT1308A/LT1308B are high current, micropower single cell, 600kHz DC/DC converters. They can provide 5V at 1A from a single Li-Ion cell, or 5V at 800mA in SEPIC mode from four NiCd cells. The converters operate at a fixed frequency and have automatic Burst Mode/continuous switching at light loads. They are suitable for applications such as GSM/CDMA phones, digital cameras, LCD bias supplies, battery backup supplies, and handheld computers.
The LT1308A/LT1308B are micropower, fixed‑frequency step‑up DC/DC converters that operate from 0.92 V to 10 V input. They provide up to 34 V output, feature burst‑mode operation for the LT1308A, and maintain low quiescent current (140 µA typical for LT1308A, 2.5 mA for LT1308B). The devices include a low‑battery detector with a 200 mV reference and a shutdown pin that disables the converter when tied low.
Typical applications include GSM/CDMA phones, digital cameras, LCD bias supplies, GPS receivers, handheld computers, and battery‑backup supplies. The datasheet lists pin functions, absolute maximum ratings, electrical characteristics, and recommended PCB layout for both SO‑8 and 14‑lead TSSOP packages.
| Switching Frequency | 600 kHz typical |
|---|---|
| Input Voltage Range | 0.92 V – 10 V |
| Maximum Output Voltage | 34 V |
| Shutdown Current (max) | 1 pA |
| Low‑Battery Detector Reference | 200 mV ±2 % |
Both devices can boost the input voltage up to 34 V.
The converters operate at a fixed frequency of about 600 kHz.