NJM2817
LOW DROPOUT VOLTAGE REGULATOR
GENERAL DESCRIPTION
The NJM2817 is a low dropout voltage regulator with ON/OFF
control.
Advanced Bipolar technology achieves low noise, high ripple
rejection and low quiescent current.
It delivers up to 5V/3A output power with the maximum input
voltage of 8V.
The NJM2817 is suitable for audio/video and digital applications.
FEATURES
High Ripple Rejection
65dB typ. (f=1kHz,3V Version)
Output Noise Voltage
Vno=42µVrms typ. (Vo=3V Version)
Output capacitor with 4.7µF ceramic capacitor (Vo≥2.1V)
Output Current
Io(max.)=3.0A
High Precision Output
Vo
±1.0%
Low Dropout Voltage
0.12V typ. (Io=1.5A, 3.0V Version)
ON/OFF Control
Internal Short Circuit Current Limit
Internal Thermal Overload Protection
Package Outline
TO-252-5
PIN CONFIGURATION
3
PACKAGE OUTLINE
NJM2817DL3
123 45
1. V
IN
2. CONTROL
3. Vo
4. N.C.
5. GND
NJM2817DL3
EQUIVALENT CIRCUIT
V
IN
Current
Limit
V
OUT
CONTROL
Bandgap
Reference
Thermal
Protection
GND
Ver.2010-07-12
-1-
NJM2817
OUTPUT VOLTAGE RANK LIST
Device Name
V
OUT
NJM2817DL3-18
1.8V
NJM2817DL3-21
2.1V
NJM2817DL3-03
3.0V
NJM2817DL3-05
5.0V
Output voltage options available : 1.8 ~ 5.0V (0.1V step)
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)
RATINGS
+8
+8
1190(*1)
3125(*2)
-40
∼
+85
-40
∼
+150
UNIT
V
V
mW
°C
°C
(*1) : Mounted on glass epoxy board. (76.2×114.3×1.6mm:EIA/JDEC standard size, 2Layers, copper area 100mm
2
)
(*2) : Mounted on glass epoxy board. (76.2×114.3×1.6mm:EIA/JDEC standard size, 4Layers,
(4Layers inner foil : 74.2 x 74.2mm Applying thermal via holes to a board based on JEDEC standard JESD51-5)
OPERATING VOLTAGE
V
IN
=V
O
+
∆V
I-O
~ +7V (In case of 2.1V
≤
V
O
≤
5.0V version)
V
IN
=2.3V ~ +7V (In case of V
O
< 2.1V version)
ELECTRICAL CHARACTERISTICS
(V
IN
=Vo+1V, C
IN
=4.7µF(C
IN
=10µF:Vo<2.1V), Co=4.7µF(Co=33µF : Vo<2.1V), Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
Output Voltage
Vo
Io=100mA
-1.0%
Quiescent Current
I
Q
Io=0mA, except I
CONT
-
Quiescent Current
V
CONT
=0V
-
I
Q (OFF)
at Control OFF
Output Current
Io
Vo x 0.9V
3
Line Regulation
-
∆Vo/∆V
IN
V
IN
=Vo+1V
∼
7V, Io=100mA
Load Regulation
-
∆Vo/∆Io
Io=0
∼
3.0A
-
2.1V
≤
Vo < 2.5V
-
2.5V
≤
Vo < 2.8V
Dropout Voltage(*2)
Io=1.0A
∆V
I -O
-
2.8V
≤
Vo < 3.4V
-
3.4V
≤
Vo
≤
5.0V
ein=200mVrms,f=1kHz,
-
Ripple Rejection
RR
Io=100mA,Vo=3V Version
Average Temperature
-
∆Vo/∆Ta
Ta=0
∼
85°C, Io=100mA
Coefficient of Output Voltage
f=10Hz
∼
80kHz, Io=100mA,
Output Noise Voltage
V
NO
-
Vo=3V Version
Control Current
I
CONT
V
CONT
=1.6V
-
Control Voltage for ON-state
V
CONT(ON)
1.6
Control Voltage for OFF-state
V
CONT(OFF)
-
Io≤1.5A, Vo×0.96
2.3
Minimum Input Voltage
V
IN (MIN.)
Vo<2.1V
1.5A<Io≤2.0A, Vo×0.96
2.4
(*2): The output voltage excludes under 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.
TYP.
-
700
-
5
0.01
0.05
0.16
0.13
0.12
0.11
65
±
50
42
3
-
-
-
-
MAX.
+1.0%
1200
1
-
0.05
0.3
0.27
0.22
0.20
0.18
-
-
-
12
-
0.6
-
-
UNIT
V
µA
µA
A
%/V
%/A
V
dB
ppm/°C
µVrms
µA
V
V
V
V
-2-
Ver.2010-07-12
NJM2817
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2817DL3 PowerDissipation
(Topr=-40~+85°C,Tj=150°C)
3500
Power Dissipation P
D
(mW)
3000
2500
2000
1500
1000
500
0
-50
on 4 layers board
on 2 layers board
-25
0
25
50
75
100
Temperature : Ta(°C)
TEST CIRCUIT
A
V
IN
I
IN
*3
V
IN
4.7µF
V
OUT
*3
NJM2817
4.7µF
(Ceramic)
I
OUT
V
V
OU
A
V
V
CONT
I
CONT
CONTROL
GND
*3 : Vo < 2.1V version : C
IN
=10µF
Vo < 2.1V version : Co=33µF(Ceramic)
Ver.2010-07-12
-3-
NJM2817
TYPICAL APPLICATION
1
In the case where ON/OFF Control is not required:
V
IN
*4
V
IN
4.7µF
R
CONTROL
V
OUT
*4
V
OUT
4.7µF
NJM2817
GND
*4 : Vo < 2.1V version : C
IN
=10µF
Vo < 2.1V version : Co=33µF
Connect control terminal to V
IN
terminal
2
In use of ON/OFF CONTROL:
V
IN
*4
V
IN
4.7µF
R
CONTROL
V
OUT
*4
V
OUT
4.7µF
NJM2817
GND
*4 : Vo < 2.1V version : C
IN
=10µF
Vo < 2.1V version : Co=33µF
State of control terminal:
•“H”→
output is enabled.
•“L”
or “open”
→
output is disabled.
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.
-4-
Ver.2010-07-12
NJM2817
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 4.7µF greater to avoid the problem.
C
IN
should connect between GND and V
IN
as short as possible.
Output Capacitance C
O
Output capacitor (Co) is required for a phase compensation of the internal error amplifier. The capacitance and the
equivalent series resistance (ESR) influence stability of the regulator.
If use a smaller Co, it may cause excess output noise or oscillation of the regulator due to lack of the phase
compensation. Therefore, use Co with the recommended capacitance or greater value and connect between Vo
terminal and GND terminal with minimal wiring.
The recommended capacitance depends on the output voltage. Low voltage regulator requires greater value of
the Co. Thus, check the recommended capacitance for each output voltage.
Use of a greater Co reduces output noise and ripple output, and also improves transient response of the output
voltage against rapid load change.
This product is designed to work with any capacitor including a low ESR capacitor for the Co; however, refer
"Equivalent Series Resistance vs. Output Current" and choose suitable capacitor.
When distance from an IC to load is long, an IC may cause malfunction by wiring capacity and an L ingredient
Please use it after having evaluated it enough.
Ver.2010-07-12
-5-
51单片机
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