L6924UTR

L6924UTR is a fully monolithic battery charger that safely charges single-cell Li ion/Polymer battery from either a USB power source or an AC adapter. In USB mode, the L6924U supports both low-power and high-power mode. Alternatively the device can charge from an AC wall adapter. The ideal solution for space-limited portable products integrates power MOSFET, reverse blocking diode, sense resistor and thermal protection into a compact VFQFPN16 package. When an external voltage regulated adapter or USB port is used, it works in linear mode and charges battery in CC/CV profile. The device has an operating input voltage ranging from 2.5 to 12V and it allows the user to program many parameters. The L6924U offers two open collector outputs for diagnostic purposes, which can be used to either drive two external LEDs or communicate with a host microcontroller. It also features gas gauge function, checks for battery presence and monitors and protects the battery from unsafe thermal conditions.

• Charges single-cell Li-Ion batteries from selectable AC adapter or USB input
• Programmable charge current up to 1 A in AC adapter mode
• Programmable charging current in USB mode for both high-power and low-power inputs
• 4.2 V output voltage with ±1% accuracy
• Linear or quasi-pulse operating mode
• Closed-loop thermal control
• Programmable end-of-charge current, programmable charge timer
• NTC or PTC thermistor interface for battery temperature monitoring and protection
• Status outputs to drive LEDs or to interface with a host processor