The LT1512 is a 500kHz current mode switching regulator specially configured to create a constant-current/constant-voltage battery charger. It has a current sense feedback circuit for accurately controlling output current and supports flyback or SEPIC topology chargers. It allows charging even when the input voltage is lower than the battery voltage, has a maximum switch current of 1.5A, and 1% voltage accuracy for lithium battery applications.
The LT1512 is a 500 kHz current‑mode switching regulator designed for constant‑current/constant‑voltage battery charging using a SEPIC topology. It offers a programmable charging current, 1 % voltage accuracy for lithium batteries, and the ability to operate with input voltage higher, equal to, or lower than the battery voltage.
The document includes detailed electrical characteristics, pin descriptions, typical application schematics, layout recommendations, and package dimensions for the 8‑lead plastic SO (narrow) package. It also covers shutdown and synchronization features, component selection, and thermal considerations.
| Switching Frequency | 500 kHz |
|---|---|
| Maximum Switch Voltage | 40 V |
| Maximum Switch Current | 1.5 A |
| Current Sense Voltage | 100 mV |
| Package Type | 8‑Lead Plastic Small Outline (SO) |
A logic low on the S/S pin activates shutdown, reducing the input supply current to about 12 µA.
The regulator operates at a typical switching frequency of 500 kHz.
It is supplied in an 8‑lead plastic small‑outline (SO) package.