NJM2842
Very Low Output Low Dropout Regulator
GENERAL DESCRIPTION
PACKAGE OUTLINE
The NJM2842 is a very low output voltage, low drop out
regulators.
It delivers up to 1A output current with the output voltage from
0.8V to 1.8V.
The use of an external bias voltage can improve the
transient response and the ripple rejection characteristics while
maintaining minimum input to output voltage.
The NJM2842 suitable for constant-voltage source such as
NJM2842U2
NJM2842KH1
CPU, DSP and ASIC.
FEATURES
• Output Voltage Range
:0.8V to 1.8V
• High Ripple Rejection
:91 dB typ.@VO=1.2V
• Output Noise Voltage
:VNO=44 µVrms.typ@VO=1.2V
• Output Current
:IO(min)=1.0A
• High Precision Output
:VO±1.0%
• Dual input Voltage Type
:VIN, VBIAS (sequence free)
• High Stability for Load
:0.002%/mA (max)
• Output Capacitor with 4.7µF ceramic capacitor
• Low Dropout Voltage
:0.1V typ. @IO=600mA
• ON/OFF Control
• Built-in Thermal Overload Protection and Current Limit Protection
• Bipolar Technology
• Package Outline
：SOT89-5, ESON6-H1, TO252-5
NJM2842DL3
PIN CONNECTION
5
2
4
1
2
3
6
1. CONTROL
2. GND
3. VOUT
4. VIN
5.VBIAS
1
5
2
4
3
1
2
6
5
NJM2842KH1
NJM2842U2
3
3
1. VIN
2. VBIAS
3. N.C.
4. CONTROL
5. GND
6. VOUT
Exposed Pad
4
（Connected to GND）
1. CONTROL
2. VOUT
3. GND
4. VIN
5.VBIAS
12 3 4 5
NJM2842DL3
BLOCK DIAGRAM
VOUT
VIN
VBIAS
Thermal
Protection
CONTROL
Bandgap
Reference
Over Current
Protection
GND
Ver.2012-02-27
-1-
NJM2842
OUTPUT VOLTAGE RANK
Device Name
SOT89-5
NJM2842U2-008
NJM2842U2-010
NJM2842U2-012
NJM2842U2-015
NJM2842U2-018
V out
0.8V
1.0V
1.2V
1.5V
1.8V
Device Name
ESON6-H1
NJM2842KH1-008
NJM2842KH1-010
NJM2842KH1-012
NJM2842KH1-015
NJM2842KH1-018
V out
0.8V
1.0V
1.2V
1.5V
1.8V
Device Name
TO252-5
NJM2842DL3-012
V out
1.2V
Available Fixed Output Voltage Setting Range: 0.8V to 1.8V
ABABSOLUTE MAXIMUM RATINGS
PARAMETER
SYNBOL
Input Voltage
VIN
Bias Voltage
VBIAS
Control Voltage
VCONT
(Ta=25°C)
RATINGS
UNIT
+7
V
+7
V
+7
V
625 (*1)
SOT89-5
2400 (*2)
1190(*1)
TO252-5
Power Dissipation
PD
mW
3125(*2)
440 (*3)
ESON6-H1
1200 (*4)
Operating Temperature
Topr
-40∼+85
°C
Storage Temperature
Tstg
-50∼+150
°C
(*1): Mounted on glass epoxy board. (76.2x 114.3x1.6mm:EIA/JDEC standard size, 2Layers, Cu area 100mm2)
(*2): Mounted on glass epoxy board. (76.2x 114.3x1.6mm:EIA/JDEC standard size, 4Layers)
(4Layers: Applying 74.2×74.2mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
(*3): Mounted on glass epoxy board based on EIA/JEDEC. (101.5x 114.57x1.6mm, 2Layers, Use the Exposed Pad)
(*4): Mounted on glass epoxy board based on EIA/JEDEC. (101.5x 114.57x1.6mm, 4Layers, Use the Exposed Pad)
(4Layers: Applying 99.5×99.5mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)
BIAS VOLTAGE INPUT RANGE
VBIAS= +2.5V to +5.5V
(VO<1.5V)
VBIAS= +VO+1V to +5.5V (VO≥1.5V)
-2-
Ver.2012-02-27
NJM2842
ELECTRICAL CHARACTERISTICS
(VBIAS=2.5V(Vo≥1.5V: VBIAS=VO+1V), VIN=Vo+1V, CBIAS=0.1µF, CIN=4.7µF, CO=4.7µF, Ta=25˚C)
PARAMETER
Output Voltage
Unloaded Bias Current
Unloaded Input Current
Bias Current at Control OFF
Input Current at Control OFF
Output Current
SYMBOL
VO
IBIAS
IIN
IBIAS(OFF)
IIN(OFF)
IO
TEST CONDITION
IO=30mA
IO=0mA, except ICONT
IO=0mA, except ICONT
VCONT=0V
VCONT=0V
VO × 0.9V
MIN.
TYP.
MAX.
UNIT
-1.0%
1000
300
1700
+1.0%
500
20
100
100
-
V
µA
µA
nA
nA
mA
-
-
0.10
%/V
-
0.10
0.10
0.002
0.18
%/V
%/mA
V
VBIAS=2.5V to +5.5V(VO<1.5V)
Line Regulation 1 (VBIAS)
Line Regulation 2 (VIN)
Load Regulation
Dropout Voltage
Ripple Rejection Ratio 1 (VBIAS)
Ripple Rejection Ratio 2 (VIN)
Average Temperature Coefficient
of Output Voltage
Output Noise Voltage
Control Current
Control Voltage for ON-state
Control Voltage for OFF-state
Bias Voltage
Input Voltage
• Table1
Voltage
Rank
MIN.
0.8V
1.0V
1.2V
1.5V
1.8V
-
Ver.2012-02-27
RR1(VBIAS)
TYP.
MAX.
77
75
73
71
70
-
∆VO/∆VBIAS VBIAS=VO+1V to +5.5V(VO≥1.5V)
IO=30mA
∆VO/∆VIN VIN=VO+1V to +5.5V, IO=30mA
IO=30 to 1000mA
∆VO/∆IO
IO=600mA
∆VI-O
VBIAS=3.5V(VO<1.5V)
VBIAS=3.8V(VO≥1.5V)
RR1(VBIAS)
ebias=200mVrms, f=1kHz,
IO=10mA
ebias=200mVrms, f=1kHz,
RR2(VIN)
IO=10mA
∆VO/∆Ta
VNO
ICONT
f=10Hz to 80kHz, IO=10mA
VCONT=1.6V
ICONT(ON)
VCONT(ON)
VBIAS
VIN
UNIT
MIN.
-
dB
Refer to Table 1
dB
±50
-
Ta=0 to +85°C, IO=10mA
RR2(VIN)
TYP.
MAX.
93
92
91
90
89
-
Refer to Table 1
-
Refer to Table 1
3
12
1.6
0.6
5.5
5.5
UNIT
MIN.
dB
-
VNO
TYP.
MAX.
34
38
44
47
51
-
ppm/°C
µVrms
µA
V
V
V
V
UNIT
µVrms
-3-
NJM2842
TEST CIRCUIT
A
IBIAS
VBIAS
NJM2842
0.1µF
A
A
VIN
VBIAS
ICONT
CONTROL
VIN
4.7µF
VOUT
4.7µF
GND
V VCONT
IIN
(Ceramic)
IOUT
V VOUT
TYPICAL APPLICATION
a) In case of where ON/OFF control is not required:
VBIAS
VBIAS
VIN
VIN
0.1µF
4.7µF
NJM2842
R
CONTROL
VOUT
VOUT
GND
4.7µF
b) In use of ON/OFF control:
VBIAS
VBIAS
NJM2842
0.1µF
VIN
VIN
4.7µF
R
CONTROL
VOUT
VOUT
GND
4.7µF
State of control terminal:
“H” → output is enabled.
“L” or “open”→ output is disabled.
-4-
Ver.2012-02-27
NJM2842
*In the case of using a resistance "R" between VBIAS and control.
If this resistor is inserted, it can reduce the control current when the control voltage is high.
The applied voltage to control terminal should set to consider voltage drop through the resistor “R” and the minimum
control voltage for ON-state.
The VCONT (ON) and ICONT 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.
* Bias Capacitance (CBIAS) and an Input Capacitance (CIN)
CBIAS and CIN are 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 CBIAS and CIN value (refer to conditions of ELECTRIC CHARACTERISTIC) or
larger and should connect between VBIAS-GND and VIN-GND as shortest path as possible to avoid the problem.
*Output Capacitor CO
Output capacitor (CO) 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 CO 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 CO reduces output noise and ripple output, and also improves output
transient response when rapid load change.
Therefore, use the recommended CO value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger
and should connect between GND and VOUT 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 CO, recommend that have withstand voltage margin against output voltage and superior temperature
characteristic.
Ver.2012-02-27
-5-
NJM2842
TYPICAL CHARACTERICTICS
NJM2842_1.2V
Output Voltage vs. Input Voltage
1.5
NJM2842_1.2V
Output Voltage vs. Input Voltage
1.5
o
@:Ta=25 C
VBIAS=CNT=2.5V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
1.4
1.3
Io=0A
1
1.2
Io=0A
1.1
Io=100mA
1
0.5
Io=500mA
0.9
o
@:Ta=25 C
VIN=2.2V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
Io=800mA
0.8
Io=1000mA
0.7
0.8
0
1
1.2
1.4
1.6
1.8
2
0
2.2
0.5
1
1.5
2
2.5
3
Input Voltage : V BIAS(V)
Input Voltage : V IN(V)
NJM2842_1.2V
Ground Pin Current vs. Output Current
NJM2842_1.2V
Output Voltage vs. Output Current
1
1.4
o
@:Ta=25 C
VIN=2.2V
CNT=Vbias=2.5V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
1.2
0.8
Output Voltage:Vo(Vo)
1
25˚ C
0.6
0.8
-50˚ C
150˚ C
0.6
0.4
0.4
@:Vin=2.2V
Vbias=Vcont=2.5V
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
0.2
0.2
0
0
500
1000
1500
2000
0
2500
0
200
400
Output Current:Io(mA)
600
800
1000
1200
Output Current : Io(mA)
NJM2842_1.2V
Control Current vs. Control Voltage
NJM2842_1.2V
Output Voltage vs. Control Voltage
20
1.5
o
@:Ta=25 C
VIN=2.2V
VBIAS=2.5V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
Io=0mA
15
Rc=0Ω
1
Rc=0Ω
Rc=50kΩ
10
Rc=50kΩ
Rc=100kΩ
0.5
o
@:Ta=25 C
VIN=2.2V
VBIAS=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Io=0mA
5
Rc=100kΩ
0
0
0.5
1
1.5
2
Control Voltage : Vcont(V)
2.5
3
0
0
0.5
1
1.5
2
2.5
3
Control Voltage : Vcont(V)
-6-
Ver.2012-02-27
NJM2842
NJM2842_1.2V
Load Regulation vs. Output Current
NJM2842_1.2V
Peak Output Current vs. Input Voltage
0
3000
2500
-10
2000
-20
1500
-30
1000
o
@:Ta=25 C
VBIAS=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
o
@:Ta=25 C
Vin=2.2V
Vbias=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=1uF(Ceramic)
-40
500
0
-50
0
250
500
750
1000
1250
0
1500
1
2
3
4
5
6
7
Input Voltage : V IN(V)
Output Current : Io(mA)
NJM2842_1.2V
Quiescent Current v.s. Input Voltage
NJM2842_1.2V
Quiescent Current v.s. Input Voltage
10
1000
o
o
@:Ta=25 C
Vbias=CNT=2.5V
Output is open.
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF (Ceramic)
8
@:Ta=25 C
Vin=2.2V
Vcnt=1.6V
Output is open.
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF (Ceramic)
800
6
600
4
400
2
200
0
0
0
1
2
3
4
5
6
7
0
1
2
Input Voltage : V IN(V)
3
4
5
6
7
Input Voltage : V BIAS(V)
NJM2842_1.2V
Dropout Voltage vs. Output Current
0.8
100
NJM2842_1.2V
Output Noise Voltage vs. Output Current
o
@:Ta=25 C
Vbias=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=1uF(Ceramic)
0.7
o
80
0.6
@:Ta=25 C
VIN=2.2V
VBIAS=CNT=2.5V
Cin=Co=4.7uF
Cbias=0.1uF
0.5
60
0.4
40
0.3
0.2
20
0.1
0
0
200
400
600
800
Output Current:Io(mA)
Ver.2012-02-27
1000
1200
0
0.001
0.01
0.1
1
10
100
1000
Output Current : Io(mA)
-7-
NJM2842
NJM2842_1.2V
Ripple Rejection Ratio v.s. Frequency
NJM2842_1.2V
Ripple Rejection(Vbias-Vout) vs. Output Current
100
120
90
f=1KHz
100
80
Io=500mA
Io=10mA
Io=0mA
Io=1000mA
Io=100mA
70
80
60
60
40
10
o
@:Ta=25 C
VIN=2.2V
VBIAS=3.5V
ein=200mVrms
Cin=0.1uF(Ceramic)
Cbias=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
40
30
1K
100
f=10KHz
50
o
@:Ta=25 C
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
VIN=2.2V
VBIAS=3.5V
ebias=200mVrms
20
0.001
100K
10K
0.01
Frequency : f (Hz)
0.1
1
10
100
1000
Output Current : Io(mA)
NJM2842_1.2V
Equivalent Serise Resistance vs. Output Current
NJM2842_1.2V
Ripple Rejection(Vin-Vout) vs. Output Current
100
100
@:Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
VIN=1.3V-5.5V
VBIAS=2.5V-5.5V
90
f=1KHz
10
80
70
f=10KHz
STABLE REGION
1
60
50
o
@:Ta=25 C
VIN=2.2V
VBIAS=2.5V
ein=200mVrms
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
40
30
20
0.001
0.01
0.1
0.1
1
10
100
0.01
0.001
1000
0.01
0.1
1.5
1.225
Output Voltage Vo (Vo)
Control Voltage:Vcont(off) (V)
1.25
1
@:Vin=2.2V
Vbias=2.5V
Io=30mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
-8-
0
50
Temperature Ta(°C)
100
10
3
1.2
@:Vbias=Vcont=2.5V
Vin=2.2V
Io=30mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
1.175
1.15
0
-50
10
NJM2842_1.2V
Output Voltage vs.Temperature
NJM2842_1.2V
Control Voltage vs.Temperature
2
0.5
1
Output Current : Io(mA)
Output Current : Io(mA)
100
150
-50
0
50
Temperature Ta(°C)
100
150
Ver.2012-02-27
NJM2842
NJM2842_1.2V
Quiescent Current vs.Temperature
NJM2842_1.2V
Peak Output Current vs.Temperature
3000
500
400
Quiescent Current:Iq(uA)
Peak Output Current:Imax(mA)
2400
1800
1200
@:Vo*0.9
Vin=2.2V
Vbias=Vcont=2.5V
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
600
300
200
@:Vbias=Vcont=2.5V
Vin=2.2V
Output is open
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
100
0
0
-50
0
50
Temperature Ta(°C)
100
-50
150
0
50
0.2
0.1
0.1
0
@:dVin=2.2-5.5V
Vbias=Vcont=2.5V
Io=30mA
Cin=4.7uF(Ceramic)
0
@:dVbias=2.5-5.5V
Vin=2.2V
Vcont=2.5V
Io=30mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
-0.1
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
-0.2
-0.2
-50
0
50
Temperature Ta(°C)
100
150
-50
0
NJM2842_1.2V
Load Regulation v s.Temperatture
50
Temperature Ta(°C)
100
150
NJM2842_1.2V
Output Voltage v s.Temperature
0.01
1.5
@:Vin=2.2V
Vbias=Vcont=2.5V
Io=30-1000mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
1.3
1.1
Output Voltage Vo (Vo)
0.008
Load Regulation:dVo/dIo(%/mA)
150
NJM2842_1.2V
Line Regulation(VBIAS) v s.Temperatture
0.2
Line Regulation:dVo/dIo(%/V)
Line Regulation:dVo/dIo(%/V)
NJM2842_1.2V
Line Regulation(VIN) vs.Temperatture
-0.1
100
Temperature Ta(°C)
0.006
0.004
0.9
0.7
0.5
0.3
0.002
@:Vbias=Vcont=2.5V
Vin=2.2V
Io=30mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
0.1
0
-0.1 -50
-50
Ver.2012-02-27
0
50
Temperature Ta(°C)
100
150
0
50
100
150
200
Temperature Ta(°C)
-9-
NJM2842
NJM2842_1.2V
NM2842_1.2V
Short Circuit Current vs.Temperature
ON/OFF Transient Response Without Load
3.5
4
Control Voltage
1500
Output Voltage:Vo(V)
1000
@:Vin=2.2V
Vbias=Vcont=2.5V
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
2.5
2
1.5
-6
0.5
-8
0
50
100
-10
-0.5
150
0
2
4
Temperature Ta(°C)
2
1.40
@:Ta=25°C
VIN=2.2V
VBIAS=2.5V
Co=4.7uF
Io=30mA
-2
-4
-6
Output Voltage
0.5
-8
0
0
4
8
12
16
20
Output Voltage:Vo(V)
1.45
Control Voltage:Vcont(V)
Output Voltage:Vo(V)
4
0
2.5
1.5
1.35
0
1.25
-500
1.20
-1000
1.10
-12
1.05
0
40
0
Output Voltage
6
1.6
2
1.28
5
4
Input Voltage
1.26
3
1.24
2
1
1.22
Output Voltage
-2
1.18
-1
-3
1.16
1.18
1.2
-2500
0
-1
Time:t(ms)
200
1.20
1.20
0.8
Output Voltage:Vo(V)
1
Input Voltage:Vin(V)
Output Voltage:Vo(V)
2
@:Ta=25°C
Vcont=VBIAS=2.5V
Co=4.7uF
Io=30mA
0.4
160
@:Ta=25°C
VIN=2.2V
Co=4.7uF
Io=30mA
1.30
4
3
0
-2000
NJM2842_1.2V
Line transient Response(Vin Fixed)
1.32
1.26
- 10 -
120
80
-1500
Time:t(µs)
1.28
1.16
@:Ta=25°C
VIN=2.2V
VBIAS=2.5V
Co=4.7uF
Io=500-
Output Voltage
1.15
-10
Input Voltage
1.22
500
Output Current
5
1.24
1500
1.30
NJM2842_1.2V
Line transient Response(Vbias Fixed)
1.30
-12
1000
Time:t(ms)
1.32
10
NJM2842_1.2V
Control Voltage
2
8
Load transient Response
3.5
3
6
Time:t(s)
NJM2842_1.2V
ON/OFF Transient Response
-0.5
-4
Output Voltage
0
1
-2
1
0
-50
0
@:Ta=25°C
VIN=2.2V
VBIAS=2.5V
Co=4.7uF
Io=0mA
Output Current:Io(mA)
500
2
0
0.4
0.8
1.2
1.6
2
Input Voltage:Vin(V)
Short Circuit Current:Isc(mA)
3
Control Voltage:Vcont(V)
2000
-2
Time:t(ms)
Ver.2012-02-27
NJM2842
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including the
industrial rights.
Ver.2012-02-27
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