NJU7287 Datasheet, PDF (1/11 Pages) New Japan Radio – Battery Backup Switching IC

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. (I_RO =3mA) / REG1
:0.3V max. (I_OUT =23mA) / REG2
:0.06Vmax. (I_CH=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
1
8
2
7
3
6
4
5
NJU7287xRB1
1.V_SS
2.V_CH
3.V_BAT
4.CS
———————
5. RESET
6.V_OUT
7.V_IN
8.V_RO
Ver.2012-07-18
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