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ADP3802 Datasheet(PDF) 1 Page - Analog Devices |
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ADP3802 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADP3801/ADP3802 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 High Frequency Switch Mode Dual Li-Ion Battery Chargers FUNCTIONAL BLOCK DIAGRAM ADP3801/ADP3802 LDO + REFERENCE A/B SELECT MUX DRV VCC CS+ CS– A/B PROG ADJ COMP GND SD VL RESET ISET BATB BATA EOC SD\UVLO GATE DRIVE CURRENT LOOP AMP + EOC COMPARATOR PWM FINAL BATTERY VOLTAGE PROGRAM (4.2, 8.4, 12.6) VOLTAGE LOOP AMP BATTERY VOLTAGE ADJUST 10% SHUTDOWN UVLO + RESET FEATURES Stand-Alone Li-Ion Battery Chargers High End-of-Charge Voltage Accuracy 0.4% @ +25 C 0.75% @ –10 C to +70 C Intelligent End-of-Charge Output Signal Pin Programmable Cell Number Select On Chip 3.3 V LDO Regulator Programmable Charge Current with High Side Sense Softstart Charge Current Undervoltage Lockout Drives External PMOS 10% Adjustable End-of-Charge Voltage Charges NiCad, NiMH (with External Controller) PWM Oscillator Frequency: ADP3801: 200 kHz ADP3802: 500 kHz APPLICATIONS Fast Chargers Universal Chargers Cellular Phones Portable Computers Portable Instrumentation Desktop Chargers Personal Digital Assistants GENERAL DESCRIPTION The ADP3801 and ADP3802 are complete battery charging ICs. The devices combine a high accuracy final battery voltage control with a constant charge current control and an on-board Low Drop-Out Regulator (LDO). The accuracy of the final battery voltage control is guaranteed to ±0.75% to safely charge Li-Ion batteries. An internal multiplexer allows the alternate charging of two separate battery stacks. The final voltage is pin programmable to one of three Li-Ion options: 4.2 V (one Li-Ion cell), 8.4 V (two Li-Ion cells), or 12.6 V (three Li-Ion cells). Paired with an external microcontroller for charge termination, the ADP3801/ADP3802 works as a fast charger for NiCad/ NiMH batteries or as a universal charger for all three battery chemistries. In addition, a pin is provided for changing the final battery voltage by up to ±10% to adjust for variations in battery chemistry from different Li-Ion manufacturers without loss of accuracy in the final battery voltage. BATA BATB VCC DRV EOC CS– CS+ ISET BATA ADJ GND RESET VIN VL ADP3801/ADP3802 SD BATB 3.3V 40m A/B COMP PROG 68 H Figure 1. 4 Amp Dual Battery Charger |
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