DC370A is a constant current/constant voltage battery charger designed to charge one Lithium-Ion cell.
This quick start manual describes how to evaluate Linear Technology's DC370A-A (4.1V) and DC370A-B (4.2V) demo boards, which use the LTC1734 linear battery charger to charge one Li-Ion cell. The boards feature preset charge voltages of 4.1V or 4.2V with ±1% tolerance and can deliver up to 700mA of charge current. The guide covers setup, testing, and shutdown procedures using test equipment like power supplies and digital voltmeters.
The LTC1734 drives a PNP transistor in a linear regulator configuration, allowing for easy interface with CPU or other circuitry. The boards are designed for evaluation and prototyping, with features like manual shutdown, low battery drain current, and no isolation diode or sense resistor required. The manual includes step-by-step instructions for testing constant current, constant voltage, and sleep modes.
| Input Voltage Range | 4.7V to 7V |
|---|---|
| Output Voltage (Constant Voltage Mode) | 4.1V +1% for DC370A-A and 4.2V +1% for DC370A-B |
| Output Current (Constant Current Mode) | 700mA +10% |
| Program Pin Voltage at Full Charge Current | 1.5V + 5% |
| Battery Drain Current with Vpy Removed | <1pA |
DC370A-A has a charge voltage of 4.1V ±1%, and DC370A-B has 4.2V ±1%.
The maximum charge current is 700mA, which can be programmed between 100mA and 700mA.
The program pin voltage at full charge current is 1.5V ±5%.
The battery drain current is less than 1pA.