NJU7286
Battery Backup Switching IC
GENERAL DESCRIPTION
The NJU7286 is a battery backup system IC with two 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 NJU7286 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 NJU7286 is available in small and thin packages of
8-lead MSOP (TVSP) and SSOP. And there are four voltage
options available, as follow table.
FEATURES
Low Quiescent Current
Low Dropout Voltage
2CH(REG1, REG2) Output Voltage
2CH(CS, RESET) Output Voltage
______________
PACKAGE OUTLINE
NJU7286RB1
(MSOP8 (VSP8))
NJU7286V
(SSOP8)
:12µA max. (V
IN
=3.6V) / Normal operation
:2.1µA max. (V
BAT
=3.0V) / Backup
:0.06V max. (I
RO
=3mA) / REG1
:0.3V max. (I
OUT
=23mA) / REG2
:±2.0%
:
±
2.0%
Exclusive Sequence
Small Package SSOP8, MSOP8 (TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
PIN CONFIGURATION
1.V
SS
2.NC
3.V
BAT
4.CS
5. RESET
6.V
OUT
7.V
IN
8.V
RO
______________
1
2
3
4
8
7
6
5
MSOP8 (TVSP-8)
SSOP-8
Ver.2012-07-18
-1-
NJU7286
SELECTION GUIDE
Device Name
NJU7286A
NJU7286B
NJU7286C
NJU7286D
Output Voltage (V)
V
RO
V
OUT
CS Voltage (V)
-V
DET1
+V
DET1
RESET Voltage (V)
-V
DET2
+V
DET2
______________
Switch Voltage (V)
V
SW1
+V
DET1
X
0.85
3.200
3.150
3.300
3.200
3.200
3.150
3.300
3.200
3.300
4.200
3.800
3.300
3.401
4.305
3.903
3.401
2.400
2.300
2.100
2.250
2.528
2.420
2.230
2.362
______________
+V
DET1
X
0.85
+V
DET1
X
0.85
+V
DET1
X
0.85
Caution: The NJU7286D is avalable in only MSOP8 (TVSP8).
CS voltage should be set up so that switch voltage (V
SW1
) may become more than RESET voltage (-V
DET2
).
Note: The selection range is as follows.
V
RO,
V
OUT
: 2.3 to 5.4V (0.1V Step)
-V
DET1
:2.4 to 5.4V (0.1V Step)
-V
DET2
:1.7 to 3.4V (0.1V Step)
V
SW1
:+V
DET1
X0.85
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Main Power Supply Input Voltage
Backup Power Supply Input Voltage
Output Voltage of Voltage Regulator
Output Voltage
Power Dissipation
CS
Output Voltage
(Ta=25°C)
SYMBOL
V
IN
V
BAT
V
RO
, V
OUT
V
CS
V
RESET
P
D
Topr
Tstg
RATINGS
+10
+10
V
SS
-0.3 to V
IN
+0.3
V
SS
-0.3 to +10
250
320
-40 to +85
-40 to +125
UNIT
V
V
V
V
V
mW
°C
°C
RESETOutput Voltage
SSOP-8
MSOP8 (TVSP8)
______________
Operating Temperature
Storage Temperature
-2-
Ver.2012-07-18
微控制器 MCU
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