NJU7287

Battery Backup Switching IC NJU7287 „ GENERAL DESCRIPTION The NJU7287 is a battery backup system IC with three regulators, two voltage detectors, a battery switching system and their control circuit. It switches the regulator output from main power supply source to the backup battery when it detects main power supply drop and also has two voltage detection outputs. The NJU7287 employs an exclusive sequence on the battery switching system which reduces the battery operation. Combining the special sequence and its low operating current, it is well-suited for battery backup systems of DSC, DVC and other portable devices. The NJU7287 is available in small and thin packages of 8-lead MSOP (TVSP) and 12-lead PCSP12-C3. „ PACKAGE OUTLINE NJU7287xRB1 (MSOP8 (TVSP8)) „ FEATURES z Low Quiescent Current :13µA max. / Normal operation :2.1µA max. / Backup z Low Dropout Voltage :0.06V max. (IRO =3mA) / REG1 :0.3V max. (IOUT =23mA) / REG2 :0.06Vmax. (ICH=3mA) / REG3 z 3ch(REG1, REG2, REG3) Output Voltage :±2.0% ——————— z 2ch(CS, RESET) Detection Voltage : ± 2.0% z Exclusive Sequence z Small Package NJU7287xRB1 : MSOP8 (TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE „ PIN CONFIGURATION 18 27 36 45 NJU7287xRB1 1.VSS 2.VCH 3.VBAT 4.CS ——————— 5. RESET 6.VOUT 7.VIN 8.VRO Ver.2012-07-18 -1- NJU7287 „ SELECTION GUIDE Device Name Output Voltage (V) VRO VOUT VCH CS Voltage (V) -VDET1 +VDET1 —R—E—S——E—T— Voltage (V) -VDET2 +VDET2 Switch Voltage (V) VSW1 NJU7287A 3.0...