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
Pin Function
1. CONTROL
2. GND
3. N.C.
4. V
OUT
5. V
IN
NJU7790U1
EQUIVALENT CIRCUIT
V
IN
Thermal
Protection
V
OUT
CONTROL
Output
Control
V
ref
GND
Current
Limit
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
Device Name
NJU7790U1-15
1.5V
NJU7790U1-33
NJU7790U1-21
2.1V
NJU7790U1-05
NJU7790U1-03
3.0V
V
OUT
3.3V
5.0V
Ver.2013-06-13
-1-
NJU7790
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
Power Dissipation
Operating Temperature
Storage Temperature
P
D
Topr
Tstg
(Ta=25°C)
UNIT
V
V
mW
°C
°C
RATINGS
+9
+9(*1)
500(*2)
765(*3)
-40∼+85
-40∼+125
(*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 size, 2Layers, Cu area 100mm
2
)
(*3): Mounted on glass epoxy board. (76.2
×
114.3
×
1.6mm:based on EIA/JDEC standard, 4Layers)
(For 4Layers: Applying 74.2
×
74.2mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
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
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX. UNIT
Output Voltage
Vo
Io=30mA
-1.0%
–
+1.0%
V
Input Voltage
V
IN
–
–
8
V
Quiescent Current
I
Q
Io=0mA, V
CONT
=V
IN
, Include I
CONT
–
30
60
µA
Quiescent Current
I
Q(OFF)
V
CONT
=0V
–
0.1
1.0
µA
at Control OFF
Vo - 0.1V(Vo≤2.0V Version)
Output Current
Io
500
–
–
mA
Vo - 0.3V(Vo≥2.1V Version)
Short Current Limit
I
LIM
Vo=0V
–
180
–
mA
V
IN
=Vo+1V
∼
Vo+6.0V (Vo<2V Version)
Line Regulation
–
–
0.15
%/V
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
8.0V (Vo≥2V Version),
Io=30mA
Load Regulation
–
–
0.005 %/mA
∆Vo/∆Io
Io=0
∼
500mA
–
0.17
0.22
V
2.1V≤Vo<2.5V
–
0.15
0.19
V
2.5V≤Vo<2.9V
Dropout Voltage(*4)
Io=300mA
∆V
I-O
–
0.14
0.18
V
2.9V≤Vo<3.5V
–
0.12
0.16
V
3.5V≤Vo≤5.0V
ein=200mVrms,f=400Hz,Io=10mA,
Ripple Rejection
RR
–
65
–
dB
Vo=3V Version
Average Temperature
–
–
∆Vo/∆Ta
Ta=0
∼
+85°C, Io=10mA
±100
ppm/°C
Coefficient of Output Voltage
f=10Hz
∼
80kHz, Io=10mA,
Output Noise Voltage
V
NO
–
75
–
µVrms
Vo=3VVersion
Pull-down Resistance
R
CONT
2
5
10
MΩ
Control Voltage for ON-state
V
CONT(ON)
1.6
–
–
V
Control Voltage for OFF-state
V
CONT(OFF)
–
–
0.3
V
(*4): 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.2013-06-13
NJU7790
TEST CIRCUIT
A
V
IN
I
IN
V
IN
V
OUT
1.0
µ
F
NJU7790
2.2µF
(ceramic)
*5
I
OUT
V
V
OUT
A
V
V
CONT
I
CONT
CONTROL
GND
*5
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
*6
NJU7790
CONTROL
GND
*6: Vo≤2.0V version: Co=4.7µF
Connect control pin to V
IN
pin.
Ver.2013-06-13
-3-
NJU7790
2
In use of ON/OFF Control
V
IN
V
IN
V
OUT
V
OUT
2.2µF
*7
1.0µF
NJU7790
CONTROL
GND
*7: Vo≤2.0V version: Co=4.7µF
State of control pin:
●
“H”
→
output is enabled.
●
“L” or “open”
→
output is disabled.
*In the case of using a resistance "R" between V
IN
and control.
If this resistor is inserted, it can reduce the control current when the control voltage is high.
The applied voltage to control pin should set to consider voltage drop through the resistor “R” and the minimum
control voltage for ON-state.
The V
CONT (ON)
and I
CONT
have temperature dependence as shown in the "Control Current vs. Temperature" and
"Control Voltage vs. Temperature" characteristics. Therefore, the resistance "R" should be selected to consider the
temperature characteristics.
*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
The recommended capacitance depends on the output voltage rank. Especially, low voltage regulator requires larger
C
O
value.
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.
-4-
Ver.2013-06-13
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
(µA)
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
o
0
0
100
200
300
400
500
600
700
800
0
100
200
300
400
500
600
700
800
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.2013-06-13
-5-
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