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DS2714 Quad Loose Cell NiMH Charger www.maxim-ic.com GENERAL DESCRIPTION The DS2714 is ideal for standalone charging of 1 to 4 AA or AAA NiMH "loose" cells. NiCd cells can also be charged. 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 DS2714 supports a parallel charging topology, with independent monitoring and control of each cell. FEATURES Charges 1 to 4 NiMH Cells Detects and Avoids Charging Alkaline Cells Pre-Charges Deeply Depleted Cells Fast Charges NiMH with -V Termination Sensitivity of 2mV (typ) Monitors Voltage, Temperature and Time for Safety and Secondary Termination Works with Regulated Charge Current Source Drives PNP Type Pass Element Compatible with Integrated Primary-Side PWM Controllers 20-pin TSSOP Package APPLICATIONS Desktop/Standalone Chargers (AAA/AA) Digital Still Cameras Music Players Games Toys ORDERING INFORMATION PART DS2714E+ DS2714E+T&R MARKING DS2714 DS2714 PIN-PACKAGE 20 TSSOP 20 TSSOP Tape-and-Reel +Denotes lead-free package. CHARGE TOPOLOGY PIN CONFIGURATION TSSOP Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 12 REV: 080206 DS2714: Quad Loose Cell NiMH Charger ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to VSS Voltage on DMSEL Continuous Sink Current CC1-4, LED1-4 Operating Temperature Range Storage Temperature Range Soldering Temperature -0.3V to +6V VDD + 0.3V 20mA -40°C to +85°C -55°C to +125°C See IPC/JEDECJ-STD-020A 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 the absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS (4.0V VDD 5.5V; TA = -20°C to +70°C) PARAMETER Supply Voltage Input Voltage Range SYMBOL VDD CONDITIONS (Note 1) LEDx, DMSEL MIN 4.0 -0.3 TYP MAX 5.5 5.5 UNITS V V DC ELECTRICAL CHARACTERISTICS PARAMETER Supply Current, VDD Output Voltage Low, CC1-4. LED1-4 Leakage Current, CC1-4 LED1-4 Threshold Voltage, -V Termination Mode Test Current, DMSEL Input Logic High, DMSEL, Input Logic Low, DMSEL, Input Leakage Current, DMSEL Threshold Voltage, Cell Test Accuracy Threshold Voltage, Cell Test Range Threshold Voltage, Cell Voltage Low Threshold Voltage, Cell Voltage Max1 Threshold Voltage, Cell Voltage Max2 Threshold Voltage, Thermistor - Min Threshold Voltage, Thermistor - Max Threshold Voltage, Thermis