L6924D is a lithium battery charger system from ST. It integrates power MOSFET, reverse blocking diode, sense resistor, thermal protection and other functions.
The L6924D is a fully monolithic battery charger dedicated to single-cell Li-ion/Polymer battery packs, ideal for space-limited applications like PDAs, handheld equipment, and cellular phones. It integrates all power elements, including a power MOSFET, reverse blocking diode, and sense resistor, into a small VFQFPN16 (3 x 3 mm) package.
The device supports both linear and quasi-pulse operation modes and features closed-loop thermal control. It allows users to program various parameters such as pre-charge current, fast-charge current, and end-of-charge current. The L6924D offers two open-collector outputs for diagnostic purposes and provides flexible control of the charge process termination.
| Operating input voltage | 2.5 to 12 V |
|---|---|
| Start up threshold | 4 V |
| Package type | VFQFPN16 (3 x 3 mm) |
| Maximum charging time | 3 hours |
| Output voltage (Vout) | 4.1 V (floating) or 4.2 V (GND) |
| Thermal resistance (junction to ambient) | 75 °C/W |
The operating input voltage ranges from 2.5 V to 12 V.
It uses a small VFQFPN16 package with dimensions of 3 x 3 mm.
It must be connected with a capacitor to GND to fix the maximum charging time.