19-5826; Rev 4/11
GENERAL DESCRIPTION
The DS2711 and DS2712 are ideal for in-system or stand-alone charging of 1 or 2 A...
19-5826; Rev 4/11
GENERAL DESCRIPTION
The DS2711 and DS2712 are ideal for in-system or stand-alone charging of 1 or 2 AA or AAA NiMH “loose” cells. Temperature, voltage, and charge time are monitored to provide proper fast-charging control algorithms for nickel metal hydride (NiMH) batteries. Battery tests are included to detect defective or inappropriate cells such as alkaline primary batteries. The DS2711/DS2712 support series and parallel topologies, with independent monitoring and control of each cell. Charging of NiCd chemistry cells is also supported.
APPLICATIONS
Desktop/Stand-Alone Chargers (AAA/AA)
Digital Still Cameras
Music Players
Games
Toys
FEATURES
Charge 1 or 2 NiMH Cells Detect and Avoid Charging Alkaline Cells Precharge Deeply Depleted Cells Fast Charge NiMH with -∆V Termination
Sensitivity of 2mV (typ) Monitor Voltage, Temperature, and Time for
Safety and Secondary Termination Regulate Charge Current:
Linear Control (DS2711)
Switch-Mode Control (DS2712) Drive pMOS or
pnp-Type Pass Element or
Switch, or an Optocoupler Compatible with Popular Optocouplers and
Integrated Primary-Side PWM Controllers Small 16-Pin SO or TSSOP Packages
DS2711/DS2712 Loose-Cell NiMH Chargers
PIN CONFIGURATION
CC1 CC2 LED1 VSS LED2 CSOUT VN1 VN0
1 2 3 4 5 6 7 8
16 VP2 15 VP1 14 THM2 13 THM1 12 VDD 11 TMR 10 CTST 9 DMSEL
SO (150 mils) TSSOP (4.4mm)
PIN DESCRIPTION
PIN NAME
FUNCTION
1 CC1 Cell 1 Charge-Control Output
2 CC2 Cell 2 Charge-Control Output
3 L...