NJU7790
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJU7790 is a 500mA output low dropout voltage
regulator with ON/OFF control.
Advanced CMOS technology achieves high ripple rejection
and low quiescent current.
Small packaging and 2.2µF small decoupling capacitor make the
NJU7790 suitable for space conscious applications.
FEATURES
High Ripple Rejection
65dB typ. (f=400Hz, Vo=3.0V Version)
Low quiescent Current
Iq=30µA typ.(Io=0mA)
Output Current
Io(max.)=500mA
High Precision Output
Vo±1.0%
Output capacitor with 2.2µF ceramic capacitor (Vo≥2.1V version)
Low Dropout Voltage
0.14V typ. (Io=300mA, Vo=3.0V Version)
ON/OFF Control
Internal Thermal Overload Protection
Internal Over Current Protection
CMOS Technology
Package Outline
SOT-89-5
PIN CONFIGURATION
5
2
4
PACKAGE OUTLINE
NJU7790U1
1
2
3
1. CONTROL
2. GND
3. N.C.
4. V
OUT
5. V
IN
NJU7790U1
EQUIVALENT CIRCUIT
V
IN
Thermal
Protection
CONTROL
Output
Control
V
OUT
V
ref
GND
Current
Limit
Ver.2007-07-19
-1-
NJU7790
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
NJU7790U1-15
1.5V
NJU7790U1-21
2.1V
NJU7790U1-03
3.0V
NJU7790U1-33
3.3V
NJU7790U1-05
5.0V
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
P
D
Operating Temperature
Topr
Storage Temperature
Tstg
(Ta=25°C)
RATINGS
UNIT
+9
V
+9(*1)
V
350(*2)
mW
-40∼+85
°C
-40∼+125
°C
(*1) : When input voltage is less than +10V, the absolute maximum control voltage is equal to the input voltage.
(*2) : Device itself.
Operating voltage
V
IN
=+2.3
∼
+8V (In case of Vo<2.1V version)
ELECTRICAL CHARACTERISTICS (V
IN
=Vo+1V, C
IN
=1.0µF, Co=2.2µF(Co=4.7µF: Vo≤2.0V), Ta=25°C)
PARAMETER
Output Voltage
Input Voltage
Quiescent Current
Quiescent Current
at Control OFF
Output Current
Short Current Limit
Line Regulation
Load Regulation
Dropout Voltage(*3)
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Vo
V
IN
I
Q
I
Q(OFF)
Io
I
LIM
∆Vo/∆V
IN
∆Vo/∆Io
∆V
I-O
Io=30mA
Io=0mA, V
CONT
=V
IN
, Include I
CONT
V
CONT
=0V
Vo - 0.1V(Vo≤2.0V Version)
Vo - 0.3V(Vo≥2.1V Version)
Vo=0V
V
IN
=Vo+1V
∼
Vo+6.0V (Vo<2V Version)
V
IN
=Vo+1V
∼
8.0V (Vo≥2V Version),
Io=30mA
Io=0
∼
500mA
2.1V≤Vo<2.5V
2.5V≤Vo<2.9V
Io=300mA
2.9V≤Vo<3.5V
3.5V≤Vo≤5.0V
ein=200mVrms,f=400Hz,Io=10mA,
Vo=3V Version
Ta=0
∼
+85°C, Io=10mA
f=10Hz
∼
80kHz, Io=10mA,
Vo=3VVersion
-1.0%
–
–
–
500
–
–
–
–
–
–
–
–
–
–
2
1.6
–
–
–
30
0.1
–
180
–
–
0.17
0.15
0.14
0.12
65
±100
75
5
–
–
+1.0%
8
60
1.0
–
–
0.15
0.005
0.22
0.19
0.18
0.16
–
–
–
10
–
0.3
V
V
µA
µA
mA
mA
%/V
%/mA
V
V
V
V
dB
ppm/°C
µVrms
MΩ
V
V
Ripple Rejection
Average Temperature
Coefficient of Output Voltage
Output Noise Voltage
Pull-down Resistance
Control Voltage for ON-state
Control Voltage for OFF-state
RR
∆Vo/∆Ta
V
NO
R
CONT
V
CONT(ON)
V
CONT(OFF)
(*3): Except output voltage less than 2.1V.
The above specification is a common specification for all output voltages.
Therefore, it may be different from the individual specification for a specific output voltage.
-2-
Ver.2007-07-19
NJU7790
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
1.0
µ
F
NJU7790
2.2µF
(ceramic)
*4
I
OUT
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
*4
Vo≤2.0V version: Co=4.7µF(ceramic)
TYPICAL APPLICATION
1
In case that ON/OFF Control is not required:
V
IN
1.0
µ
F
V
IN
V
OUT
V
OUT
2.2µF
*5
NJU7790
CONTROL
GND
*5: Vo≤2.0V version: Co=4.7µF
Connect control terminal to V
IN
terminal.
Ver.2007-07-19
-3-
NJU7790
2
In use of ON/OFF Control
V
IN
V
IN
V
OUT
V
OUT
2.2µF
*5
1.0µF
NJU7790
CONTROL
GND
*5: Vo≤2.0V version: Co=4.7µF
State of control terminal:
●
“H”
→
output is enabled.
●
“L” or “open”
→
output is disabled.
Input Capacitance C
IN
Input Capacitance C
IN
is required to prevent oscillation and reduce power supply ripple for applications with high
power supply impedance or a long power supply line.
Use the C
IN
value of 1.0µF greater to avoid the problem.
C
IN
should connect between GND and V
IN
as short as possible.
-4-
Ver.2007-07-19
NJU7790
TYPICAL CHARACTERISTICS
●DC
CHARACTERISTICS
3.2
NJU7790_3.0V
Output Voltage vs. Input Voltage
@:Ta=25 C
Co=2.2µF
(Ceramic)
C
IN
=1.0µF
o
3.5
NJU7790_3.0V
Output Voltage vs. Output Current
3
3.1
2.5
Output Voltage : Vo(V)
3
Io=0A
Output Voltage : Vo(V)
2
2.9
Io=30mA
1.5
1
@:Ta=25 C
V
IN
=4.0V
Co=2.2µF
(Ceramic)
C
IN
=1.0µF
0
200
400
600
800
1000
1200
o
2.8
Io=100mA
0.5
2.7
2.7
2.8
2.9
3
3.1
3.2
3.3
3.4
0
Input Voltage : V
IN
(V)
Output Current : Io(mA)
NJU7790_3.0V
Ground Pin Current v.s. Output Current
200
1
NJU7790_3.0V
Dropout Voltage vs. Output Current
0.8
Ground Pin Current : I
GND
(uA)
150
Dropout Voltage:dV
I-O
(V)
@:Ta=25 C
V
IN
=4.0V
Co=2.2µF
(Ceramic)
C
IN
=1.0µF
o
0.6
100
0.4
50
0.2
@:Ta=25 C
Co=2.2µF
(Ceramic)
C
IN
=1.0µF
0
800
0
100
200
300
400
500
600
700
800
o
0
0
100
200
300
400
500
600
700
Output Current : I
O
(mA)
Output Current:Io(mA)
3.5
NJU7790_3.0V
Output Voltage vs. Control Voltage
0
NJU7790_3.0V
Load Regulation vs. Output Current
3
Load Regulation : dVo-lo(mV)
2.5
-5
Output Voltage : Vo(V)
2
-10
1.5
1
@:Ta=25 C
V
IN
=4.0V
Co=2.2µF
(Ceramic)
Io=30mA
C
IN
=1.0µF
0
0.5
1
1.5
2
2.5
3
3.5
o
-15
@:Ta=25 C
V
IN
=4.0V
Co=2.2µF
(Ceramic)
C
IN
=1.0µF
-20
0
200
400
600
800
o
0.5
0
Control Voltage : Vcont(V)
Output Current : lo(mA)
Ver.2007-07-19
-5-
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