Document
Battery Backup Switching IC
NJU7286
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.
PACKAGE OUTLINE
NJU7286RB1 (MSOP8 (VSP8))
NJU7286V (SSOP8)
FEATURES z Low Quiescent Current
z Low Dropout Voltage
z 2CH(REG1, REG2) Output Voltage
:12µA max. (VIN =3.6V) / Normal operation :2.1µA max. (VBAT =3.0V) / Backup :0.06V max. (IRO =3mA) / REG1 :0.3V max. (IOUT =23mA) / REG2 :±2.0%
z 2CH(CS, RESET)______________ Output Voltage
: ± 2.0%
z Exclusive Sequence z Small Package SSOP8, MSOP8 (TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
PIN CONFIGURATION
18 27 36 45
MSOP8 (TVSP-8) SSOP-8
1.VSS 2.NC 3.VBAT 4.CS
5. RESET______________
6.VOUT 7.VIN 8.VRO
Ver.2012-07-18
-1-
NJU7286
SELECTION GUIDE
Device Name NJU7286A
Output Voltage (V)
VRO
VOUT
3.200
3.200
CS Voltage (V)
-VDET1
+VDET1
3.300
3.401
NJU7286B
3.150
3.150
4.200
4.305
NJU7286C
3.300
3.300
3.800
3.903
NJU7286D
3.200
3.200
3.300
3.401
Caution: The NJU7286D is avalable in only MSOP8 (TVSP8).
RESET______________ Voltage (V)
-VDET2
+VDET2
2.400
2.528
2.300
2.420
2.100
2.230
2.250
2.362
Switch Voltage (V) VSW1
+VDET1X0.85 +VDET1X0.85 +VDET1X0.85 +VDET1X0.85
CS voltage should be set up so that switch voltage (VSW1) may become more than RESET______________ voltage (-VDET2).
Note: The selection range is as follows. VRO, VOUT : 2.3 to 5.4V (0.1V Step) -VDET1 :2.4 to 5.4V (0.1V Step) -VDET2 :1.7 to 3.4V (0.1V Step) VSW1 :+VDET1X0.85
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 RESETOutput______________ Voltage SSOP-8
MSOP8 (TVSP8)
Operating Temperature
Storage Temperature
SYMBOL VIN VBAT
VRO, VOUT VCS
VRESET
PD
Topr Tstg
RATINGS +10 +10
VSS-0.3 to VIN+0.3
VSS-0.3 to +10
250 320 -40 to +85 -40 to +125
(Ta=25°C) UNIT V V V V V
mW
°C °C
-2-
Ver.2012-07-18
ELECTRICAL CHARACTERISTICS
NJU7286A
(CIN=0.1µF, CO(VOUT)=10µF, CO(VRO)=10µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
Total
Quiescent Current
ISS1 VIN =3.6V, No-Load IBAT1 VIN =3.6V, VBAT=3.0V, No-Load IBAT2 VIN=OPEN,VBAT=3.0V, No-Load
Backup Power Supply Input Voltage
VBAT
Voltage Regulator 1
Output Voltage 1
Dropout Voltage 1
Load Regulation 1A
Load Regulation 1B.