MCP73826 Single Cell Lithium-Ion Charge Management Controller Features Description Linear Charge Management Controller for Single The MCP73826 is a linear charge management con- Lithium-Ion Cells troller for use in space-limited, cost sensitive applica- tions. The MCP73826 combines high accuracy High Accuracy Preset Voltage Regulation: constant voltage, controlled current regulation, and cell +1% (max) preconditioning in a space saving 6-pin SOT-23A pack- Two Preset Voltage Regulation Options: age. The MCP73826 provides a stand-alone charge - 4.1V - MCP73826-4.1 management solution. - 4.2V - MCP73826-4.2 The MCP73826 charges the battery in three phases: Programmable Charge Current preconditioning, controlled current, and constant volt- Automatic Cell Preconditioning of Deeply age. If the battery voltage is below the internal low-volt- Depleted Cells, Minimizing Heat Dissipation Dur- age threshold, the battery is preconditioned with a ing Initial Charge Cycle foldback current. The preconditioning phase protects Automatic Power-Down when Input Power the lithium-ion cell and minimizes heat dissipation. Removed Following the preconditioning phase, the MCP73826 Temperature Range: -20C to +85C enters the controlled current phase. The MCP73826 Packaging: 6-Pin SOT-23A allows for design flexibility with a programmable charge current set by an external sense resistor. The charge Applications current is ramped up, based on the cell voltage, from the foldback current to the peak charge current estab- Single Cell Lithium-Ion Battery Chargers lished by the sense resistor. This phase is maintained Personal Data Assistants until the battery reaches the charge-regulation voltage. Cellular Telephones Then, the MCP73826 enters the final phase, constant Hand Held Instruments voltage. The accuracy of the voltage regulation is better Cradle Chargers than 1% over the entire operating temperature range Digital Cameras and supply voltage range. The MCP73826-4.1 is preset to a regulation voltage of 4.1V, while the MCP73826- Typical Application Circuit 4.2 is preset to 4.2V. The MCP73826 operates with an input voltage range 500 mA Lithium-Ion Battery Charger from 4.5V to 5.5V. The MCP73826 is fully specified NDS8434 MA2Q705 100 m over the ambient temperature range of -20C to +85C. V IN 5V + Single Package Type 10 F Lithium-Ion 6 4 - Cell V V SNS DRV 6-Pin SOT-23A 5 3 V V BAT IN 100 k 10 F 12 SHDN GND SHDN V 1 6 SNS MCP73826 GND MCP73826 V 2 5 IN V V 3 4 BAT DRV 2002-2013 Microchip Technology Inc. DS21705B-page 1 + MCP73826 Functional Block Diagram DS21705B-page 2 2002-2013 Microchip Technology Inc. V IN 1.1 k V IN V DRV V SNS + CHARGE + CURRENT V AMPLIFIER BAT 12 k V 352.5 k REF (NOTE 1) 500 k 75 k CHARGE CURRENT VOLTAGE CONTROL AMPLIFIER CONTROL AMPLIFIER V (1.2V) REF SHUTDOWN, SHDN REFERENCE GENERATOR V IN V REF 112.5 k + 0.3V CLAMP 75 k 37.5 k GND CHARGE CURRENT FOLDBACK AMPLIFIER NOTE 1: Value = 340.5K for MCP73826-4.1 Value = 352.5K for MCP73826-4.2