MCP73853/55 USB Compatible Li-Ion/Li-Polymer Charge Management Controllers Features Description Linear Charge Management Controllers The MCP7385X devices are highly-advanced, linear charge management controllers, for use in space- - Integrated Pass Transistor limited, cost-sensitive applications. The MCP73853 - Integrated Current Sense combines high-accuracy constant-voltage, constant- - Reverse Blocking Protection current regulation, cell preconditioning, cell temperature High-Accuracy Preset Voltage Regulation: + 0.5% monitoring, advanced safety timers, automatic charge Two Selectable Voltage Regulation Options: termination, internal current sensing, reverse blocking protection and charge status and fault indication in a - 4.1V, 4.2V space-saving 16-lead, 4x4 QFN package. Programmable Charge Current The MCP73855 employs all the features of the USB Compatible Charge Current Settings MCP73853, with the exception of the cell temperature Programmable Safety Charge Timers monitor and one status output. The MCP73855 is Preconditioning of Deeply Depleted Cells offered in a space-saving 10-lead, 3x3 DFN package. Automatic End-of-Charge Control The MCP73853 and MCP73855 are designed Optional Continuous Cell Temperature Monitoring specifically for USB applications, adhering to all the specifications governing the USB power bus. MCP73853 The MCP7385X devices provide two selectable Charge Status Output for Direct LED Drive voltage regulation options (4.1V or 4.2V) for use with Fault Output for Direct LED Drive either coke or graphite anodes. These devices have complete and fully-functional, MCP73853 charge management solutions, operating with an input Automatic Power-Down voltage range of 4.5V to 5.5V. These are fully specified Thermal Regulation over the ambient temperature range of -40C to +85C. Temperature Range: -40C to +85C Package Types Packaging: MCP73853 - 16-Lead, 4x4 mm QFN (MCP73853) 4x4 QFN* - 10-Lead, 3x3 mm DFN (MCP73855) 16 15 14 13 V V 1 12 SET BAT3 Applications V V 2 11 DD1 BAT2 EP Lithium-Ion/Lithium-Polymer Battery Chargers 17 V V 3 10 DD2 BAT1 Personal Data Assistants (PDAs) V V SS1 4 9 SS3 Cellular Telephones 56 7 8 Hand-Held Instruments MCP73855 Cradle Chargers 3x3 DFN* Digital Cameras STAT1 EN 1 10 MP3 Players V 2 9 V Bluetooth Headsets SET BAT2 EP V 3 8 V USB Chargers 11 DD1 BAT1 V 4 7 V SS1 SS2 TIMER PROG 6 5 *Exposed Pad (EP) is at V potential. SS 2004-2013 Microchip Technology Inc. DS21915C-page 1 PROG STAT1 THREF STAT2 THERM EN V TIMER SS2MCP73853/55 Typical Application 400 mA Lithium-Ion Battery Charger 3 8 V V 5V DD1 BAT1 4.7 F 2 9 4.7 F V V SET BAT2 10 EN 1 STAT1 + Single 6 Lithium-Ion TIMER 0.1 F Cell 4, 7 5 PROG V SS MCP73855 Functional Block Diagram Direction Control V V DD1 BAT1 V V DD2 BAT2 V DD G = 0.001 4k V REF Charge Current 90 3k k Control Amplifier PROG Voltage Control + Amplifier 11 k Charge V 10 k REF V REF V Termination BAT3 Comparator 110 k + Precondition Charge OK 600 k I /12 Precondition REG Comp. Precon. Control 10 k U VLO COMPARATOR + 149 k Constant-voltage/ V Recharge Comp. UVLO 1.58 k EN Power-On V REF Delay 300 k V UVLO Bias and V (1.2V) V Reference REF SET Generator 10.3 k V SS1 V SS2 THREF V SS3 Temperature 100 k STAT1 Comparators + THERM Drv Stat 1 - Charge Control, 50 k Charge Timers, STAT2 I /12 + REG and - Drv Stat 2 Status Logic Oscillator 50 k MCP73853 ONLY MCP73853 ONLY TIMER Charge OK DS21915C-page 2 2004-2013 Microchip Technology Inc. + + +