DS2715

DESCRIPTION

The DS2715 is well suited for cost-sensitive charger applications where the battery is either internal or in a unique battery pack. It has been optimized for safe reliable charging of 1 to10 NiMH cells in series. The DS2715 has an internal gain block that can be selected as either a comparator or transconductance amplifier for charge current regulation. The DS2715 is configurable as a switched DC charger, a linear current regulator, or a switchmode current source. The DS2715 pre-conditions severely depleted cells are pre-conditioned before entering full charge mode. The DS2715 terminates full charge using the dT/dt technique. It requires an external thermistor for dT/dt detection. Over-temperature, under-temperature, and over-voltage detection prevents charging under unsafe environmental conditions. A user selectable charge timer allows charge rates from 0.15C to 2C. Fast-charge, top-off and charge done modes are included for highly reliable, safe charging of NiMH cells. Discharge mode allows the DS2715 to enter a low power sleep state while the cell pack is being discharged.

FEATURES

■ Charges 1 to 10 NiMH Cells
■ Fast Charges up to a 2C Rate
■ Pre-Charge and Top-Off Charge Modes Help Cell Conditioning
■ Load Detection Allows the DS2715 to Enter Low Power Sleep Mode (Less than 10µA) while the Cell Pack is Discharged
■ dT/dt Charge Termination Eliminates Cell Charge Stress
■ Monitors Voltage, Temperature, and Time for Safety and Secondary Termination
■ Regulates Current through Either Linear Control or Switch-Mode Control
■ LED Outputs Display Charge State
■ Small 16-Pin SO Package

APPLICATIONS

Portable DVD Players
Portable Television Sets
Handheld Gaming
Test Equipment
Handheld POS Terminals