259 Adafruit

MCP73833/4 Stand-Alone Linear Li-Ion / Li-Polymer Charge Management Controller Features Description The MCP73833/4 is a highly advanced linear charge Complete Linear Charge Management Controller management controller for use in space-limited, cost - Integrated Pass Transistor sensitive applications. The MCP73833/4 is available in - Integrated Current Sense a 10-Lead, 3 mm x 3 mm DFN package or a 10-Lead, - Integrated Reverse Discharge Protection MSOP package. Along with its small physical size, the Constant Current / Constant Voltage Operation low number of external components required makes with Thermal Regulation the MCP73833/4 ideally suited for portable High Accuracy Preset Voltage Regulation: applications. For applications charging from a USB port, the MCP73833/4 can adhere to all the 0.75% - 4.2V, 4.35V, 4.4V, or 4.5V, + specifications governing the USB power bus. Programmable Charge Current: 1A Maximum The MCP73833/4 employs a constant current/constant Preconditioning of Deeply Depleted Cells voltage charge algorithm with selectable precondition- - Selectable Current Ratio ing and charge termination. The constant voltage - Selectable Voltage Threshold regulation is fixed with four available options: 4.20V, Automatic End-of-Charge Control 4.35V, 4.40V, or 4.50V, to accomodate new, emerging - Selectable Current Threshold battery charging requirements. The constant current value is set with one external resistor. The MCP73833/ - Selectable Safety Time Period 4 limits the charge current based on die temperature Automatic Recharge during high power or high ambient conditions. This - Selectable Voltage Threshold thermal regulation optimizes the charge cycle time Two Charge Status Outputs while maintaining device reliability. Cell Temperature Monitor Several options are available for the preconditioning Low-Dropout Linear Regulator Mode threshold, preconditioning current value, charge termination value, and automatic recharge threshold. Automatic Power-Down when Input Power The preconditioning value and charge termination Removed value are set as a ratio, or percentage, of the Under Voltage Lockout programmed constant current value. Preconditioning Numerous Selectable Options Available for a can be set to 100%. Refer to Section 1.0 Electrical Variety of Applications: Characteristics for available options and the - Refer to Section 1.0 Electrical Product Indentification System for standard Characteristics for Selectable Options options. - Refer to the Product Identification System for The MCP73833/4 is fully specified over the ambient Standard Options temperature range of -40C to +85C. Available Packages: Package Types - DFN-10 (3 mm x 3 mm) DFN-10 V 1 10 V DD BAT - MSOP-10 V 2 9 V DD BAT Applications EP STAT1 3 8 THERM 11 Lithium-Ion / Lithium-Polymer Battery Chargers STAT2 PG(TE) 4 7 Personal Data Assistants 6 PROG 5 V SS Cellular Telephones MSOP-10 V 110 V DD BAT Digital Cameras V 2 9 V DD BAT MP3 Players STAT1 3 8 THERM Bluetooth Headsets STAT2 4 7 PG(TE) USB Chargers V 5 6 PROG SS 2009 Microchip Technology Inc. DS22005B-page 1MCP73833/4 Typical Application 1A Li-Ion Battery Charger 1,2 9,10 V V V IN DD BAT Single + 1F 1F Li-Ion - Cell 38 STAT1 THERM 470 4 6 STAT2 PROG 470 1k T 10 k 7 5 PG V SS 470 MCP73833 Functional Block Diagram V DD Direction Control 10 A V BAT CURRENT 6A G=0.001 LIMIT + 1k - G=0.001 PROG CA + Reference - Generator 111 k V (1.21V) REF 310 k 10 k + 72.7 k - PRECONDITION 470.6 k 6A + 48 k - TERMINATIO N + - 6k CHARG E VA + - 157.3 k 50 A + - SHDN 175 k + STAT1 Charge - Control, 54 k LDO Timer, and + STAT2 Status - Logic 121 k UVLO V SS + PG (TE) - 470.6k HTVT THERM + - LTVT 121 k 1M DS22005B-page 2 2009 Microchip Technology Inc.