DS2715

`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 10A) 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

Voltage on VDD and VCH Pins with Respect to.......... V_SS -0.3V to +18V
Voltage on LED1 and LED2 Pins .......................................-0.3V to +18V
Voltage on SNS- ..............................................................-0.3V to +0.3V
Voltage on CBIAS .................................................................-0.3V to 6V
Voltage on all Other Pins ................................................-0.3V to V_Cbias
Continuous Sink Current VCH, LED1, and LED2 ............................28mA
Operating Temperature Range ...................................-20°C to +85°C
Storage Temperature Range ....................................-55°C to +125°C
Soldering Temperature ...................................See IPC/JEDECJ-STD-020
*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

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.