19-5826 Rev 4/11 DS2711/DS2712 Loose-Cell NiMH Chargers GENERAL DESCRIPTION PIN CONFIGURATION The DS2711 and DS2712 are ideal for in-system or stand-alone charging of 1 or 2 AA or AAA NiMH CC1 1 16 VP2 loose cells. Temperature, voltage, and charge time are monitored to provide proper fast-charging control 2 15 CC2 VP1 algorithms for nickel metal hydride (NiMH) batteries. 3 14 LED1 THM2 Battery tests are included to detect defective or 4 13 VSS THM1 inappropriate cells such as alkaline primary batteries. The DS2711/DS2712 support series and parallel LED2 5 12 VDD topologies, with independent monitoring and control of 6 11 CSOUT TMR each cell. Charging of NiCd chemistry cells is also 7 10 VN1 CTST supported. VN0 8 9 DMSEL APPLICATIONS SO (150 mils) Desktop/Stand-Alone Chargers (AAA/AA) TSSOP (4.4mm) Digital Still Cameras Music Players PIN DESCRIPTION Games PIN NAME FUNCTION Toys 1 CC1 Cell 1 Charge-Control Output 2 CC2 Cell 2 Charge-Control Output 3 LED1 Cell 1 Status FEATURES Ground Reference and Chip- 4 V Charge 1 or 2 NiMH Cells SS Supply Return Detect and Avoid Charging Alkaline Cells 5 LED2 Cell 2 Status, Mode-Select Input 6 CSOUT Current-Sense Output Precharge Deeply Depleted Cells 7 VN1 Current-Sense + Input Fast Charge NiMH with -V Termination 8 VN0 Current-Sense - Input Sensitivity of 2mV (typ) 9 DMSEL Display-Mode Select 10 CTST Cell Test Threshold Set Monitor Voltage, Temperature, and Time for 11 TMR Charge Timer Set Safety and Secondary Termination 12 V Chip-Supply Input (4.0V to 5.5V) DD Regulate Charge Current: 13 THM1 Cell 1 Thermistor Input 14 THM2 Cell 2 Thermistor Input Linear Control (DS2711) Cell 1 Positive-Terminal Sense 15 VP1 Switch-Mode Control (DS2712) Input Cell 2 Positive-Terminal Sense Drive pMOS or pnp-Type Pass Element or 16 VP2 Input Switch, or an Optocoupler Compatible with Popular Optocouplers and Integrated Primary-Side PWM Controllers Small 16-Pin SO or TSSOP Packages 1 of 15 DS2711/DS2712: Loose-Cell NiMH Chargers ABSOLUTE MAXIMUM RATINGS Voltage Range on All Pins Relative to V -0.3V to +6V SS Voltage Range on DMSEL..V + 0.3V DD Continuous Sink Current CC1, CC2, LED1, LED2, and CSOUT............................20mA Operating Temperature Range-40C to +85C Storage Temperature Range.-55C to +125C Lead Temperature (soldering, 10s) ................................................................................................................. +300C Soldering Temperature (reflow) Lead(Pb)-free ............................................................................................................................................ +260 C Containing lead(Pb) ................................................................................................................................... +240C 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. RECOMMENDED DC OPERATING CONDITIONS (4.0V V 5.5V, T = -20 C to +70 C, unless otherwise noted.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 1) 4.0 5.5 V DD Input Voltage Range LED2, DMSEL -0.3 +5.5 V DC ELECTRICAL CHARACTERISTICS (4.0V V 5.5V, T = -20 C to +70 C, unless otherwise noted.) DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current, V I Operating mode 250 500 A DD DD UVLO Threshold V V rising (Note 1) 3.5 3.9 V UVLO DD V falling from above DD UVLO Hysteresis V 40 mV UHYS V UVLO Output-Voltage Low, V = 5.0V, DD V 1.0 V OL1 CC1, CC2, LED1, LED2 I = 20mA (Note 1) OL Output-Voltage Low, V = 5.0V, DD V 0.75 1.25 V OL2 CSOUT I = 20mA (Note 1) OL Leakage Current, V = 5.0V, DD CC1, CC2, LED1, LED2, I -1 +1 A LKG Output inactive CSOUT Threshold Voltage, V After t 1.0 2.0 3.0 mV THO -V - V Termination Mode Test Current, I (Notes 2, 3) 5 15 A MTST DMSEL, LED2 Input Logic-High, V - DD V (Note 1) V IH DMSEL, LED2 0.2 Input Logic-Low, DMSEL, V (Note 1) 0.2 V IL LED2 After power-up mode Input Leakage Current, I select, -1 +1 A IL1 DMSEL DMSEL = V or V DD SS Threshold Voltage, Cell V 85 100 115 mV R = 80k CTST CTST Test Threshold Voltage, Cell CC1 = CC2 = high-Z V 0.9 1.0 1.1 V BAT-LOW Voltage Low (Note 4) Threshold Voltage, Cell CC1 = CC2 = high-Z V 1.55 1.65 1.75 V BAT-MAX1 Voltage Max1 (Note 4) Threshold Voltage, Cell CC1, CC2 active V 1.64 1.75 1.86 V BAT-MAX2 Voltage Max2 (Note 4) V - V BAT-MAX2 BAT-MAX1 Threshold Voltage Delta V 90 100 110 mV BAT-MAX (Note 5) 2 of 15