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( File format: PDF, 646 KB )
Switch Mode Lithium-Ion Battery Charger Controller (Rev. B)
Texas Instruments

Description
The UCC3956 family of switch-mode lithium-ion battery-charger controllers accurately control lithium-ion battery charging with a highly-efficient average-current-control loop. This chip is designed to work as a stand-alone charger controller for a single-cell or multiple-cell battery pack. This chip combines charge-state logic and average-current PWM control circuitry with a 14-bit counter to program the overcharge time. The charge-state logic indicates current-or voltage-control depending on the charge state. The chip includes undervoltage lockout (UVLO) circuitry to ensure sufficient supply voltage is present before output switching starts. Additional circuit blocks include a differential-current-sense amplifier, a 1% voltage reference, voltage- and current-error amplifiers, PWM latch, charge-state decode bits, and a 500-mA output driver.
Features
Precision 4.1 V Reference (1%) High-Efficiency Battery Charger Solution High-Side or Low-Side Switch-Mode Current-Sensing Average-Current-Mode Control from Trickle to Overcharge Resistor-Programmable Charge Currents Internal State Logic Provides Four Charge States Programmable Overcharge Time CHG Pin Initiates Charging Output-Status Bits Report Charge State

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