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LP3921

SNVS580A – AUGUST 2008 – REVISED MAY 2013

www.ti.com

Connection Diagram

Figure 1. Device Pin Diagram

Device Description

The LP3921 Charge Management and Regulator Unit is designed to supply charger and voltage output

capabilities for mobile systems, e.g. CDMA handsets. The device provides a Li-Ion charging function and 7

regulated outputs. Communication with the device is via an I2C compatible serial interface that allows function

control and status read-back.

Battery Charge Management provides a programmable CC/CV linear charge capability. Following a normal

charge cycle a maintenance mode keeps battery voltage between programmable levels. Power levels are

thermally regulated to obtain optimum charge levels over the ambient temperature range.

CHARGER FEATURES

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Pre-charge, CC, CV and Maintenance modes

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USB Charge 100 mA/450 mA

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Integrated FET

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Integrated Reverse Current Blocking Diode

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Integrated Sense Resistor

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Thermal regulation

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Charge Current Monitor Output

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Programmable charge current 50 mA - 950 mA with 50 mA steps

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Default CC mode current 100 mA

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Pre-charge current fixed 50 mA

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Termination voltage 4.1V, 4.2V (default), 4.3V, and 4.4V, accuracy better than +/- 0.35% (typ.)

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Restart level 100 mV, 150 mV (default) and 200 mV below Termination voltage

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Programmable End of Charge 0.1C (default), 0.15C, 0.2C and 0.25C

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Enable Control Input

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Safety timer

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Input voltage operating range 4.5V - 6.0V

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