LP3921 Datasheet, PDF (4/41 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

LP3921
SNVS580A – AUGUST 2008 – REVISED MAY 2013
Connection Diagram
Figure 1. Device Pin Diagram
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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
• Pre-charge, CC, CV and Maintenance modes
• USB Charge 100 mA/450 mA
• Integrated FET
• Integrated Reverse Current Blocking Diode
• Integrated Sense Resistor
• Thermal regulation
• Charge Current Monitor Output
• Programmable charge current 50 mA - 950 mA with 50 mA steps
• Default CC mode current 100 mA
• Pre-charge current fixed 50 mA
• Termination voltage 4.1V, 4.2V (default), 4.3V, and 4.4V, accuracy better than +/- 0.35% (typ.)
• Restart level 100 mV, 150 mV (default) and 200 mV below Termination voltage
• Programmable End of Charge 0.1C (default), 0.15C, 0.2C and 0.25C
• Enable Control Input
• Safety timer
• Input voltage operating range 4.5V - 6.0V
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