NJU7747/48
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DISCRIPTION
NJU7747/48 is a low dropout voltage regulator with ON/OFF
control.
Advanced CMOS technology achieves ultra low quiescent current.
SC-82AB package and 0.1µF small output capacitor make the
NJU7747/48 suitable for space conscious applications.
NJU7748 features shunt switch which improves turn off response
of output voltage when ON/OFF control is used.
FEATURES
Ultra Low quiescent Current
Iq=1.5µA typ.(I
O
=0mA)
Output capacitor with 0.1uF ceramic capacitor
Output Current
I
O
(max.)=100mA
High Precision Output
V
O
±1.0%
Low Dropout Voltage
0.17V typ. (I
O
=40mA, V
O
=3V version)
With ON/OFF Control
(Active High)
With Output Shunt Switch
Only NJU7748
Internal Short Circuit Current Limit
CMOS Technology
Package Outline
SC-82AB
PIN CONFIGURATION
4
3
PACKAGE OUTLINE
NJU7747/48F4
1
2
PIN FUNCTION
1.CONTROL
2.GND
3. V
OUT
4. V
IN
NJU7747/48F4
EQUIVALENT CIRCUIT
V
IN
V
OUT
V
IN
V
OUT
CONTROL
Output
Control
CONTROL
Output
Control
Vref
Current
Limit
Vref
Current
Limit
GND
GND
NJU7747
NJU7748
Ver.2013-06-07
-1-
NJU7747/48
OUTPUT VOLTAGE RANK LIST
DEVICE NAME
V
OUT
DEVICE NAME
NJU774*F4-15
1.5V
NJU774*F4-28
NJU774*F4-18
1.8V
NJU774*F4-29
NJU774*F4-19
1.9V
NJU774*F4-03
NJU774*F4-02
2.0V
NJU774*F4-31
NJU774*F4-25
2.5V
NJU774*F4-33
NJU774*F4-27
2.7V
NJU774*F4-37
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
V
OUT
2.8V
2.9V
3.0V
3.1V
3.3V
3.7V
DEVICE NAME
NJU774*F4-04
NJU774*F4-45
NJU774*F4-05
V
OUT
4.0V
4.5V
5.0V
Operating Temperature
Topr
°C
Storage Temperature
Tstg
°C
Output Sink Current
I
O
10
mA
at OFF-state(*3)
(*1) When input voltage is less than +10V, the absolute maximum control voltage is equal to the input voltage.
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*3): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers), internal Cu area: 74.2×74.2mm
(*4): This maximum rating is applied to NJU7748.
ELECTRICAL CHARACTERISTICS (V
IN
=V
O
+1V, C
IN
=0.1µF, C
O
=0.1µF, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
−1.0%
I
O
=30mA
Output Voltage
V
O
Input Voltage
V
IN
–
Quiescent Current
I
Q
I
O
=0mA, V
CONT
=V
IN,
Except I
CONT
–
Quiescent Current
V
CONT
=0V
–
I
Q(OFF)
at Control OFF
Output Current
I
O
V
O
−0.3V
100
Short Circuit Limit
I
LIM
V
O
=0V
–
V = V +1V∼V
O
+6.0V(V
O
<3.0V)
–
Line Regulation
∆V
O
/∆V
IN IN O
V
IN
= V
O
+1V∼9.0V(V
O
≥3.0V),
I
O
=30mA
Load Regulation
–
∆V
O
/∆V
O
Io=0∼100mA
1.5V≤V
O
≤2.0V
–
Io=40mA
2.0V≤V
O
≤2.4V
–
2.5V≤V
O
≤2.7V
–
Dropout Voltage
∆V
I-O
Io=60mA
2.8V≤V
O
≤3.3V
–
3.4V≤V
O
≤5.0V
–
Average Temperature
–
∆V
O
/∆Ta Ta=0∼85°C, I
O
=10mA
Coefficient of Output Voltage
Pull-down Resistance
R
CONT
2
Control Voltage for ON-State
1.6
V
CONT(ON)
Control Voltage for OFF-State
0
V
CONT(OFF)
Pull-down Resistance at
–
R
O(OFF)
V
CONT
=0V (V
O
=3.0V Version)
OFF-state(*4)
(*4)
This electrical characteristics is applied to NJU7748.
The above specification is a common specification for all voltages.
Therefore, it may be different from the individual specification for a specific output Voltage.
RATINGS
+10
+10(*1)
250(*2)
390(*3)
−40
∼
+85
−40
∼
+125
(Ta=25°C)
UNIT
V
V
mW
TYP.
–
–
1.5
0.1
–
25
–
–
0.19
0.19
0.18
0.17
0.16
±100
5
–
–
300
MAX.
+1.0%
9
3.5
1
–
–
0.30
0.15
0.60
0.29
0.27
0.26
0.24
–
10
V
IN
0.3
–
UNIT
V
V
µA
µA
mA
mA
%/V
%/mA
V
V
V
V
V
ppm/°C
MΩ
V
V
Ω
-2-
Ver.2013-06-07
NJU7747/48
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJU7747/48F4 Power Dissipation
(Topr=-40∼+85℃,Tj=125℃)
500
Power Dissipation P
D
(mW)
On 4 layers Board
400
300
On 2 layers Board
200
100
0
-50
-25
0
25
50
75
100
Ambient Temperature Ta(℃)
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
I
OUT
V
V
OUT
0.1
µ
F
NJU7747/48
0.1
µ
F
(Ceramic)
A
V
V
CONT
I
CONT
CONTROL
GND
Ver.2013-06-07
-3-
NJU7747/48
TYPICAL APPLICATION
1
In case that ON/OFF Control is not required:
V
IN
V
IN
C
IN
0.1
µ
F
V
OUT
V
OUT
C
O
0.1
µ
F
NJU7747/48
CONTROL
GND
Connect control pin to V
IN
pin.
2
In use of ON/OFF Control
V
IN
V
IN
C
IN
0.1
µ
F
V
OUT
V
OUT
C
O
0.1
µ
F
NJU7747/48
CONTROL
GND
State of control pin:
●
“H”
→
output is enabled.
●
“L” or “open”
→
output is disabled.
-4-
Ver.2013-06-07
NJU7747/48
*Input Capacitor C
IN
Input Capacitor C
IN
is required to prevent oscillation and reduce power supply ripple for applications when high
power supply impedance or a long power supply line.
Therefore, use the recommended C
IN
value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and
should connect between GND and V
IN
as shortest path as possible to avoid the problem.
*Output Capacitor C
O
Output capacitor (C
O
) will be required for a phase compensation of the internal error amplifier.
The capacitance and the equivalent series resistance (ESR) influence to stable operation of the regulator.
Use of a smaller C
O
may cause excess output noise or oscillation of the regulator due to lack of the phase
compensation.
On the other hand, Use of a larger C
O
reduces output noise and ripple output, and also improves output
transient response when rapid load change.
Therefore, use the recommended C
O
value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger
and should connect between GND and V
OUT
as shortest path as possible for stable operation
In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a temperature
characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor supplier enough.
When selecting C
O,
recommend that have withstand voltage margin against output voltage and superior temperature
characteristic though this product is designed stability works with wide range ESR of capacitor including low ESR
products.
Ver.2013-06-07
-5-
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