The LT1307/LT1307B are micropower, fixed frequency DC/DC converters that operate from an input voltage as low as 1V. First in the industry to achieve true current mode PWM performance from a single cell supply, the LT1307 features automatic shifting to power saving Burst Mode operation at light loads. High efficiency is main- tained over a broad 100µA to 100mA load range. The LT1307B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The devices contain a low- battery detector with a 200mV reference and shut down to less than 5µA. No load quiescent current of the LT1307 is 50µA and the internal NPN power switch handles a 500mA current with a voltage drop of just 295mV. Unlike competitive devices, large electrolytic capacitors are not required with the LT1307/LT1307B in single cell applications. The high frequency (600kHz) switching al- lows the use of tiny surface mount multilayer ceramic (MLC) capacitors along with small surface mount induc- tors. The devices work with just 10µF of output capaci- tance and require only 1µF of input bypassing. The LT1307/LT1307B are available in 8-lead MSOP, PDIP and SO packages.
The LT1307 and LT1307B are micropower, fixed‑frequency PWM DC/DC converters designed for single‑cell operation. They operate from input voltages as low as 1 V and feature burst‑mode operation (LT1307) or continuous mode (LT1307B) to maintain high efficiency at light loads. Typical applications include pagers, cordless phones, GPS receivers, battery backup, portable electronics, and medical instrumentation.
The document lists electrical characteristics such as quiescent current, switch current limits, voltage ratings, and pin functions. It also includes typical performance graphs, package dimensions for PDIP, MSOP and SO variants, and a reference design for a 3.3 V boost converter. Related parts and a typical LCD bias generator circuit are provided for system designers.
| Quiescent Current (LT1307, not switching) | 50 pA min, 90 pA typ, 100 pA max |
|---|---|
| Quiescent Current (LT1307B, not switching) | 1 µA min, 15 µA typ, 1 mA max |
| Switch Current Limit (40 % duty) | 0.6 A min, 1.25 A max |
| Switch Saturation Voltage @ 500 mA (25 °C) | 295 mV typical, 350 mV max |
| Package Types | 8‑lead MSOP, PDIP, SO |
The LT1307 has a quiescent current of 50 pA minimum, 90 pA typical, and 100 pA maximum when not switching.
The shutdown pin current is specified as 2.5 pA minimum and 4.0 pA maximum.
The LBI threshold voltage is between 190 mV and 210 mV, typically 200 mV.