DS2710 Rev 0 4/08 Single-Cell NiMH Charger General Description Features The DS2710 is ideal for in-system charging of single-cell Charges Single-Cell NiMH Cells nickel metal hydride (NiMH) cells for low-current Switch-Mode Topologies Supported by Hysteretic portable applications. Inputs to the DS2710 include USB Control Technique voltage sources and 5V regulated adapters. Temperature, voltage, and charge time are monitored to Precharges Deeply Depleted Cells provide proper fast-charging control algorithms for Fast-Charges NiMH with -V Termination single-cell NiMH or nickel cadmium (NiCd) batteries. The DS2710 includes battery tests to detect defective or Sensitivity of 2mV (typ) inappropriate cells such as alkaline primary batteries. Monitors Voltage, Temperature, and Time for Safety and Secondary Termination Applications Regulates Charge Current Small Rechargeable Devices Designed for External pMOS Voice Recorders Rail-to-Rail MOSFET Driver Cordless Mouse Tiny 10-Pin TDFN Package (3mm x 4mm) Battery-Powered Toys Ordering Information PART PIN-PACKAGE DS2710G+ 10 TDFN-EP* DS2710G+T&R 10 TDFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. *EP = Exposed pad. Typical Operating Circuit Pin Configuration TOP VIEW CHARGE SOURCE + V110 VP1 SS CS CS 2 9 VN1 V VP1 DD V 3 8 VN0 DD DS2710 DS2710 THM 4 7 TMR NiMH THM *EP STATUS 5 6 CTEST CELL VN0 VN1 TDFN SENSE (3mm 4mm) GROUND *EXPOSED PAD. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Single-Cell NiMH Charger ABSOLUTE MAXIMUM RATINGS Voltage Range on All Pins Relative to V ............-0.3V to +6.0V Operating Temperature Range ...........................-40C to +85C SS Continuous Source/Sink Current CS...................................20mA Storage Temperature Range .............................-55C to +125C Continuous Source Current STATUS ..................................10mA Soldering Temperature...........................Refer to the IPC/JEDEC J-STD-020 Specification. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS (4.0V V 5.5V, T = -20C to +70C.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 4.0 5.5 V DD Input Voltage Range CTEST, TMR, THM, VP1, VN1 -0.3 V V DD DC ELECTRICAL CHARACTERISTICS (4.0V V 5.5V, T = -20C to +70C, unless otherwise noted.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current, V I Operating mode (Note 2) 250 1000 A DD DD UVLO Threshold V V rising (Note 1) 3.5 3.9 V UVLO DD UVLO Hysteresis V V falling from above V 30 mV UHYS DD UVLO Output-Voltage Low, CS V V = 5.0V, I = +20mA (Note 1) 1.0 V OL1 DD OL Output-Voltage High, CS V V = 5.0V, I = -20mA (Note 1) 4.0 V OH1 DD OL Output-Voltage Low, STATUS V V = 5.0V, I = +2mA (Notes 1, 3) 0.50 V OL2 DD OL Output-Voltage High, STATUS V V = 5.0V, I = -2mA (Notes 1, 3) 4.0 V OH2 DD OH Threshold Voltage, V After t (Note 4) 1.0 2.0 3.0 mV - V THO - V Termination 125 mV Current-Sense Reference V (Notes 1, 5) IREF Voltage -6 +6 % Hysteresis, Current-Sense V HYS- Centered ~ 0.113V 18 23 27 mV Comparator COMP Propagation Time, Current-Sense 2mV overdrive/underdrive at trip threshold t 0.1 s PDLY Comparator to Driver Output (Notes 4, 6) CS Pin Pullup Current I V < V (Note 4) 2 10 A CS DD UVLO STATUS Pin Pulldown Current I V < V (Note 4) 2 10 A STAT DD UVLO Depleted Cell Voltage Threshold V VP1 - VN1 0.9 1.0 1.1 V LOW V MAX- Overcharge Voltage Threshold VP1 - VN1, CS = high (Note 7) 1.55 1.65 1.75 V OPEN V MAX- Open Socket Voltage Threshold VP1 - VN1, CS = low (Note 7) 1.64 1.75 1.86 V CHARGE Offset, V - V V (Note 7) 98 100 102 mV MAX-OPEN MAX-CHARGE OS 22 DS2710