NJW4124

NJW4124 www.DataSheet4U.com Lithium-ion Battery Charger Controller IC with Timer ■GENERAL DESCRIPTION NJW4124 is a 1-cell and 2-cell lithium ion battery charge control IC with a built-in AC-DC secondary side control feature. Using a photocoupler to directly feed back optimum charging voltage and current information to the primary side, it increases energy efficiency, makes possible a smaller charger, and conserves energy. Charging current can be freely set and therefore it is possible to optimize charging according to battery capacity. As safety features it has over voltage, over discharge, temperature detection, and a charge over timer. Also, the adaptor and the charge control circuit are mounted on one chip. ■FEATURES ● Charge Control Feedback by Photocoupler ● Adjustable Charge Voltage ● Adjustable Pre-Charge and Full Charge Current ● Temperature Monitor ● Over Charge Timer ● Internal Re-Charge function ● Delay timers and Hysteresis inputs for high noise immunity ● Over Discharge Battery Detect ● Over Voltage Protection ● Bi-CMOS Technology ● Package Outline NJW4124M : DMP20 ■PIN CONFIGURATION P-CHG NFB TX-SW GND PC ADP LED-G LED-R C1 C2 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 ■PACKAGE OUTLINE NJW4124M Q-CHG CS1 CS2 VS VREF V+ TDET TH TL CHG-SW NJW4124M Ver.2006-01-18 -1- NJW4124 www.DataSheet4U.com ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C) PARAMETER SYMBOL Operating Voltage V+ C1 Pin Voltage VC1 C2 Pin Voltage VC2 TDET Pin Voltage VTDET TX-SW Pin Output Curr...