NJM2874/75/76
LOW DROPOUT VOLTAGE REGULATOR
!
GENERAL DESCRIPTION
NJM2874/75/76 is a low dropout voltage regulator designed
for cellular phone application.
Advanced Bipolar technology achieves low noise, high
ripple rejection and low quiescent current.
!
FEATURES
"
High Ripple Rejection
75dB typ. (f=1kHz Vo=3V Version)
"
Output Noise Voltage
Vno=45µVrms typ.
"
Output capacitor with 1.0µF ceramic capacitor (Vo≥2.7V)
"
Output Current
Io(max.)=150mA
"
High Precision Output
Vo±1%
0.10V typ. (Io=60mA)
"
Low Dropout Voltage
"
ON/OFF Control
(Active High)
"
Internal Short Circuit Current Limit
"
Internal Thermal Overload Protection
"
Bipolar Technology
"
Package Outline
SOT-23-5
!
PIN CONFIGURATION
5
4
!
PACKAGE OUTLINE
NJM2874F/75F/76F
1 2 3
PIN FUNCTION
1.CONTROL
2.GND
3.NC
4.V
OUT
5.V
IN
NJM2874F
1.V
IN
2.GND
3.CONTROL
4.NC
5.V
OUT
NJM2875F
1.V
OUT
2.GND
3.V
IN
4.CONTROL
5.NC
NJM2876F
!
EQUIVALENT CIRCUIT
V
IN
Control
Bandgap
Reference
Thermal
Protection
V
OUT
GND
NJM2874/75/76
!
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
2.1V
NJM287×F21
2.8V
NJM287×F28
3.0V
NJM287×F03
3.3V
NJM287×F33
5.0V
NJM287×F05
!
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Input Voltage
V
IN
Control Voltage
V
CONT
(Ta=25°C)
RATINGS
UNIT
+14
V
+14(*1)
V
350(*2)
Power Dissipation
P
D
SOT-23-5
mW
200(*3)
Operating Temperature
Topr
-40
∼
+85
°C
Storage Temperature
Tstg
-40
∼
+125
°C
(*1):When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
(*2):Mounted on glass epoxy board. (114.3x76.2x1.6mm: 2Layer, FR-4)
(*3):Device itself
!
ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=0.1µF, Co=1.0µF: Vo≥2.7V (Co=2.2µF: Vo≤2.6V), Ta=25°C)
PARAMETER
Output Voltage
Quiescent Current
Quiescent Current
at Control OFF
Output Current
Line Regulation
Load Regulation
Dropout Voltage
Ripple Rejection
Average Temperature
Coefficient of Output
Voltage
Output Noise Voltage
Control Voltage for
ON-state
Control Voltage for
OFF-state
SYMBOL
Vo
I
Q
I
Q(OFF)
Io
∆Vo/∆V
IN
∆Vo/∆Io
∆V
I
−
O
RR
∆Vo/∆Ta
V
NO
V
CONT(ON)
V
CONT(OFF)
TEST CONDITION
Io=30mA
Io=0mA, expect Icont
V
CONT
=0V
Vo-0.3V
V
IN
=Vo+1V
∼
Vo+6V, Io=30mA
Io=0
∼
100mA
Io=60mA
ein=200mVrms,f=1kHz, Io=10mA,
Vo=3V Version
Ta=0
∼
85°C, Io=10mA
f=10Hz
∼
80kHz, Io=10mA,
Vo=3V Version
MIN.
-1.0%
−
−
150
−
−
−
−
−
−
1.6
−
TYP.
−
120
−
200
−
−
0.10
75
±50
45
−
−
MAX.
+1.0%
180
100
-
0.10
0.03
0.18
−
−
−
−
0.6
UNIT
V
µA
nA
mA
%/V
%/mA
V
dB
ppm/°C
µVrms
V
V
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.
NJM2874/75/76
!
TEST CIRCUIT
I
IN
A
V
IN
V
IN
V
OUT
1.0µF
*4
(ceramic)
0.1µF
I
CONT
NJM287*
I
OUT
V
V
OUT
A
V
V
CONT
CONTROL
GND
*4 Vo
≤
2.6V version: Co=2.2
µ
F(ceramic)
NJM2874/75/76
!
TYPICAL APPLICATION
1
In case that ON/OFF Control is not required:
V
IN
0.1µF
R
(0∼300kΩ)
CONTROL
GND
V
IN
V
OUT
1.0µF
*5
V
OUT
NJM287*
*5 Vo≤2.6V version: Co=2.2µF
Connect control terminal to V
IN
terminal
2
In use of ON/OFF CONTROL:
V
IN
V
IN
V
OUT
1.0µF
*5
V
OUT
0.1µF
R
NJM287*
CONTROL
GND
*5 Vo
≤
2.6V version: Co=2.2
µ
F
State of control terminal:
•“H”→
output is enabled.
•“L”
or “open”
→
output is disabled.
%Noise
bypass Capacitance Cp
Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit. Noise level and
ripple rejection will be improved when larger Cp is used. Use of smaller Cp value may cause oscillation.
Use the Cp value of 0.01µF greater to avoid the problem.
%In
the case of using a resistance "R" between V
IN
and control.
The current flow into the control terminal while the IC is ON state (I
CONT
) can be reduced when a pull up
resistance "R" is inserted between V
IN
and the control terminal.
The minimum control voltage for ON state (V
CONT (ON)
) is increased due to the voltage drop caused by
I
CONT
and the resistance "R". The I
CONT
is temperature dependence as shown in the "Control Current vs.
Temperature" characteristics. Therefore, the resistance "R" should be carefully selected to ensure the
control voltage exceeds the V
CONT (ON)
over the required temperature range.
NJM2874/75/76
!
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2874/75/76F Power Dissipation
(Topr=-40½+85℃,Tj=125℃,P
D
=200mW(Ta≦25℃))
500
Power Dissipation P
D
(mW)
400
On Board(114.3×76.2×1.6mm, FR-4)
300
Device itself
200
100
0
-50
-25
0
25
50
75
100
Ambient Temperature Ta(℃)
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