EVAL6924D| Datasheet

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EVAL6924D
EVAL6924D Battery charger system with integrated Power Switch for Li-ION/Li-POLYMER
Data Brief

General description
The L6924D is a fully monolithic battery charger dedicated to single-cell Li-Ion/Polymer battery packs. It is the ideal solution for space-limited applications, like PDAs, handheld equipment, cellular phones, and digital cameras. It is designed with BCD6 technology and integrates all of the power elements (the Power MOSFET, reverse blocking diode and the sense resistor) in a small VFQFPN16 3mm x 3mm package. When an external voltage regulated wall adapter is used, the L6924D works in Linear Mode, and charges the battery in a Constant Current/Constant Voltage (CC/CV) profile. Moreover, when a current-limited adapter is used, the device can operate in Quasi-Pulse Mode, dramatically reducing the power dissipation. Regardless of the charging approach, a closed loop thermal control avoids device overheating. The device has an operating input voltage ranging from 2.5V to 12V and it allows the user to program

many parameters, such as pre-charge current, fast-charge current, pre-charge voltage threshold, end-of-charge current threshold, and charge timer. The L6924D offers two open collector outputs for diagnostic purposes, which can be used to either drive two external LEDs or communicate with a host microcontroller. Finally, the L6924D also provides very flexible control of the charge process termination and Gas Gauge capability, as well as other functions, such as checking for battery presence, and monitoring and protecting the battery from unsafe thermal conditions. The EVAL6924D Evaluation Board integrates the linear battery charger as well as the external components required for a typical application. The input voltage range can be adjusted between 2.5V and 12V, while the output voltage is selected by J4, between 4.1V and 4.2V, depending on the battery type. The fast charge current is set to 500 mA through the 24K R5 resistor.

Evaluation board

November 2006

Rev 1

1/4
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