NJM2842
-
1
-
Ver.2012-02-27
1 2 3
6 5 41 2 3
6 5 4 1 2 3
6 5 41 2 3
6 5 4
1
2
3
4
5
3
Very Low Output Low Dropout Regulator
GENERAL DESCRIPTION PACKAGE OUTLINE
FEATURES
• Output Voltage Range :0.8V to 1.8 V
• 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 V olt age Type :VIN, VBIAS (sequence free)
• High S t ability for Load :0.002%/mA (max)
• Output Cap acitor with 4.7µF ceramic capacitor
• Low Dropout Voltage :0.1V typ. @I O=600mA
• ON/OFF Control
• Built-in Thermal Overload Pro tection and Current Limit Protection
• Bipolar Technology
• Package Outline ：SOT89-5, ESON6-H1, T O252-5
PIN CONNECTION
BLOCK DIAGRAM
VOUT
GND
VBIAS
Thermal
Protection
Bandgap
Reference
CONTROL
Over Current
Protection
VIN
NJM2842U2 NJM2842KH1
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 th
e
transient response and the ripple rejectio n character istics whil
e
maintaining minimum input to output volt age.
The NJM2842 suitable for constant-voltage source such as
CPU, DSP an d ASIC.
NJM2842U2
1. CONTRO
L
2. GND
3. VOUT
4. VIN
5.VBIAS
123
452
Exposed Pad
（Connected to GND）
1. VIN
2. VBIAS
3. N.C.
4. CONTROL
5. GND
6. VOUT
NJM2842KH1
NJM2842DL3
1. CONTRO
L
2. VOUT
3. GND
4. VIN
5.VBIAS
NJM2842DL3
NJM2842
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2
-Ver.2012-02-27
OUTPUT VOL T AGE RANK
Device Name
SOT89-5 Vout Device Name
ESON6-H1 Vout Device Nam e
TO252-5 Vout
NJM2842U2-008 0.8V NJM2842KH1-008 0.8V NJM2842DL3-012 1.2V
NJM2842U2-010 1.0V NJM2842KH1-010 1.0V
NJM2842U2-012 1.2V NJM2842KH1-012 1.2V
NJM2842U2-015 1.5V NJM2842KH1-015 1.5V
NJM2842U2-018 1.8V NJM2842KH1-018 1.8V
Available Fix ed Output V olt age Setting Range: 0.8V to 1.8V
ABABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYNBOL RATINGS UNIT
Input V olt age VIN +7 V
Bias V oltage VBIAS +7 V
Control V oltag e VCONT +7 V
SOT89-5 625 (*1)
2400 (*2)
1190(*1)
TO252-5 3125(*2)
440 (*3)
Power Dissipation PD
ESON6-H1 1200 (*4)
mW
Operating Temperature Topr -40∼+85 °C
S torage Temperature Tstg -50∼+150 °C
(*1): Mounted on gla ss epoxy board. (76.2x 114.3x1.6mm:EIA/JDEC standard size, 2Layers, Cu area 100mm2)
(*2): Mounted on gla ss epoxy board. (76.2x 114.3x1.6mm:EIA/JD EC standard size, 4Layers)
(4Layers: Applying 74.2×74.2mm inne r Cu area and a thermal via hole to a board ba sed on JEDEC standard JESD51-5)
(*3): Mounted on gla ss epoxy board based on EIA/JEDE C. (101.5x 114.57x1.6mm, 2Layers, Use the Exposed Pad)
(*4): Mounted on gla ss epoxy board based on EIA/JEDE C. (101.5x 114.57x1.6mm, 4Layers, Use the Exposed Pad)
(4Layers: Applying 99.5×99.5mm inne r Cu area and a thermal via hole to a board based on JEDEC stand ard JESD51-5)
BIAS VOL T AGE INPUT RANGE
VBIAS= +2.5V to +5.5V (VO<1.5V)
VBIAS= +VO+1V to +5.5V (VO≥1.5V)
NJM2842
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3
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Ver.2012-02-27
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 SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Output V olt age VO I
O=30mA -1.0% - +1.0% V
Unloaded Bias Current IBIAS I
O=0mA, except ICONT - 300 500
µA
Unloaded Input Current IIN I
O=0mA, except ICONT - - 20
µA
Bias Current at Control OFF IBIAS(OFF) V
CONT=0V - - 100 nA
Input Current at Control OFF IIN(OFF) V
CONT=0V - - 100 nA
Output Current IO VO × 0.9V 1000 1700 - mA
Line Regulation 1 (VBIAS) ∆VO/∆VBIAS
VBIAS=2.5V to +5 .5V(VO<1.5V)
VBIAS=VO+1V to +5.5V(VO≥1.5V)
IO=30mA - - 0.10 %/V
Line Regulation 2 (VIN) ∆VO/∆VIN VIN=VO+1V to +5 .5V, IO=30mA - - 0.10 %/V
Load Regulation ∆VO/∆IO IO=30 to 1000mA - - 0.002 %/mA
Dropout V olt age ∆VI-O IO=600mA - 0.10 0.18 V
Ripple Rejection Ratio 1 (VBIAS) RR1(VBIAS)
VBIAS=3.5V(VO<1.5V)
VBIAS=3.8V(VO≥1.5V)
ebias=200mV rms, f=1kHz,
IO=10mA
Refer to Tab le 1 dB
Ripple Rejection Ratio 2 (VIN) RR2(VIN) ebias=200mV rms, f=1kHz,
IO=10mA Refer to Tab le 1 dB
Average Temperature Coefficient
of Output Voltage ∆VO/∆Ta Ta=0 to +85°C, IO=10mA - ±50 - ppm/°C
Output Noise Voltage VNO f=10Hz to 80kHz, IO=10mA Refer to Table 1
µVrms
Control Current ICONT V
CONT=1.6V - 3 12
µA
Control V olt age for ON-state ICONT(ON) 1.6 - - V
Control V oltag e for OFF-state VCONT(ON) - - 0.6 V
Bias V oltage VBIAS - - 5.5 V
Input V olt age VIN - - 5.5 V
• Table1 RR1(VBIAS) RR2(VIN) VNO V oltage
Rank MIN. TYP. MAX. UNIT MIN. TYP. MAX. UNIT MIN. TYP. MAX. UNIT
0.8V - 77 - -
93 - -
34 -
1.0V - 75 - -
92 - -
38 -
1.2V - 73 - -
91 - -
44 -
1.5V - 71 - -
90 - -
47 -
1.8V - 70 - -
89 -
dB
- 51 -
µVrms
NJM2842
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TEST CIRCUIT
NJM2842
VBIAS
VBIAS
CONTROL
GND
0.1µF
IBIAS
ICONT
VCONT
V
A
A
VOUT
4.7µF
(Ceramic) IOUT VOUT
V
VIN
4.7µFVIN
IIN
A
TYPICAL APPLICATION
a) In case of where ON/OFF control is not required:
NJM2842
VBIAS
CONTROL
GND
0.1µF
VIN
VBIAS
R
VOUT
4.7µF
VOUT
4.7µF
VIN
b) In use of ON/OFF control:
NJM2842
VBIAS VIN
CONTROL
GND
0.1µF
VIN
VBIAS
R
VOUT
4.7µF
VOUT
4.7µF
State of control terminal:
“H” → output is enabled.
“L” or “open”→ output is disabled.
NJM2842
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Ver.2012-02-27
*In the case of using a resist ance "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 sh ould set to consider voltage drop through the resistor “R” and the minimum
control voltag e 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 conne ct between VBIAS-GND and VIN-GND as shortest p ath as possible to avo id the problem.
*Output Cap acitor 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 v alue (refer to conditions of ELECTRIC CHARACTERISTIC) or l ar ge r
and s hould connect between GND and VOUT a s s h o r t es t p a t h as p o s s i b l e for stable operation
In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a temperature
characteristic, a DC bias cha racteristic and so on) and un evenness peculiar to a ca pacitor supplier enough.
When selecting CO, recommend that have withst and voltage margin against output voltage and superior temperature
characteristic.
NJM2842
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-Ver.2012-02-27
TYPICAL CHARACTERICTICS
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
0.8 1 1.2 1.4 1.6 1.8 2 2.2
Input Voltage : V
IN
(V)
NJM2842_1.2V
Output Voltage vs. Input Voltage
@:Ta=25
o
C
VBI AS=CNT=2.5V
Cin= Co= 4. 7uF
(Ceramic)
Cbias=0.1uF(Ceramic)
Io=0A
Io=500mA
Io=100mA
Io=800mA
Io=1000mA
0
0.5
1
1.5
00.511.522.53
Input V oltage : V
BIAS
(V)
NJM2842_1.2V
Output Voltag e vs. Input Voltage
@:Ta=25
o
C
VIN= 2.2V
Cin = Co= 4.7uF
(Ceramic)
Cbi as = 0.1uF ( Ceramic)
Io=0A
0
0.2
0.4
0.6
0.8
1
0 200 400 600 800 1000 1200
Output Curr ent : Io(mA)
NJM2842_1.2V
Ground Pin Current vs. Output Current
@:Ta=25oC
VIN=2.2 V
CNT=Vbias=2.5V
Cin = Co= 4.7uF
(Ceramic)
Cbi as = 0.1uF ( Ceramic)
NJM2842_1.2V
O utput V ol t age vs. O utput Current
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0500 1000 1500 2000 2500
Ou tpu t Current:Io(mA)
Output Voltage:Vo(Vo)
@:Vin=2.2V
Vbias=Vcont=2.5V
Cin=4. 7uF(Cer amic )
Cbias=0.1uF(Ceramic)
Co=4.7 uF(Cera mic )
-50˚C
25˚C
150˚C
0
5
10
15
20
00.511.522.53
Rc=0Ω
Rc=50kΩ
Rc=100kΩ
Control Voltage : Vcont(V)
NJM2842_1.2V
Control Cur rent vs. Control Voltage
@:Ta=25
o
C
VIN=2.2V
VBIAS=2.5V
Cin=Co= 4.7uF
(Ceramic)
Cbias= 0.1uF(Ceramic )
Io=0mA
0
0.5
1
1.5
00.511.522.53
Rc=0Ω
Rc=50kΩ
Rc=100kΩ
Control Voltage : Vcont(V)
NJM2842_1.2V
Output Voltage vs. Control Voltage
@:Ta=25
o
C
VIN=2.2V
VBIAS=2.5V
Cin=Co=4.7uF(Ceramic)
Cbi as = 0.1uF ( Ceramic )
Io=0mA
NJM2842
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7
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Ver.2012-02-27
-50
-40
-30
-20
-10
0
0 250 500 750 1000 1250 1500
Output Current : Io(mA)
NJM2842_1.2V
Load Regulation vs. Ou tput Cu rrent
@:Ta=25
o
C
Vin= 2.2V
Vbi as = 2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=1 uF(Ceramic)
0
500
1000
1500
2000
2500
3000
01234567
NJM2842_1.2V
Peak Output Current vs. Input Voltage
@:Ta=25
o
C
VBIAS=2.5V
C in=Co=4.7uF(Ceramic)
Cbi as = 0.1uF (Ceramic)
Inpu t Voltage : V
IN
(V)
0
2
4
6
8
10
01234567
NJM2842_1.2V
Quiesc ent Current v.s. Inp ut Voltage
@:Ta=25
o
C
Vbias=CNT= 2.5V
Output is open.
Cin=Co=4.7uF (Ceramic)
Cb ias =0.1uF
(Ceramic)
Inp ut V oltage : V
IN
(V)
0
200
400
600
800
1000
01234567
NJM2842_1.2V
Quiesc ent Curren t v.s. Input Voltage
@:Ta=25
o
C
Vin=2.2 V
Vcnt=1.6V
Output is open.
Ci n=Co=4.7uF (Cer amic)
Cb i as =0. 1uF
(Ceramic)
Input Voltage : V
BIAS
(V)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0 200 400 600 800 1000 1200
Output Current:Io(mA)
@:Ta=25
o
C
Vbias=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=1uF ( Cerami c )
NJM2842_1.2V
Dropout Voltage vs. Output Current
0
20
40
60
80
100
0.001 0.01 0.1 1 10 100 1000
Output Current : Io (mA)
NJM2842_1.2V
Output N oise Vol tage vs. Output Current
@:Ta=25
o
C
VIN=2.2 V
VBIAS=CNT=2.5V
Cin=Co=4.7uF
Cbias=0.1uF
NJM2842
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40
60
80
100
120
Frequency : f (Hz)
NJM2842_1.2V
Ripple Rejection Ratio v.s. F requency
@:Ta=25
o
C
Cin=4.7uF(Ceramic)
Cbi as = 0.1uF(Ceram ic )
Co=4.7uF
(Ceramic)
VIN= 2.2 V
VBIAS=3.5V
ebia s = 200mVrm s
10 100 1K 10K 100K
Io=0mA Io=10mA
Io=100mA
Io=500mA
Io=1000mA
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10 100 1000
Output Current : Io(mA)
NJM2842_1.2V
Ripple Rejection(Vbias-Vout) vs. Output Current
f=1KHz
f=10KHz
@:Ta=25
o
C
VIN= 2.2 V
VBIAS=3.5V
ein=2 00mV r m s
Cin=0.1uF(Ceramic)
Cbias =4.7uF ( Ceram ic )
Co=4.7u F
(Ceramic)
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10 100 1000
Output Current : Io(mA)
NJM2842_1.2V
Ripple Rejection(Vin-Vout) vs. Output Current
f=1KHz
f=10KHz
@:Ta=25
o
C
VIN= 2.2V
VBIAS=2.5V
ein=2 00m V rm s
Cin=4.7uF(Ceramic)
Cbi a s = 0.1uF(Cer am i c )
Co=4.7uF
(Ceramic)
0.01
0.1
1
10
100
0.001 0.01 0.1 1 10 100 10
3
Output Current : Io(mA)
NJM2842_1.2V
Equivalent Serise Resistance vs. Output C urrent
@:Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
VIN= 1.3 V-5.5V
VBIAS=2.5V-5.5V
STABLE REGION
NJM2842_1.2V
Co ntrol Voltage vs.Temperature
0
0.5
1
1.5
2
-50 050 100 150
T emperature T a( °C)
Control Voltage:Vcont(off) (V)
@:Vin=2.2V
Vb ias=2.5V
Io=30mA
C in = 4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF
(
Ceramic
)
NJM2842_1.2V
O u t put V ol t age vs.Temp e rat ure
1.15
1.175
1.2
1.225
1.25
-50 0 50 100 150
T emperat ure T a( ° C)
O ut put V oltage Vo (Vo)
@:Vbias=Vcont=2.5V
Vin=2.2V
Io=30mA
Cin=4. 7uF(Ce r am i c)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
NJM2842
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Ver.2012-02-27
NJM2842_1.2V
Peak Output Cu rrent vs.Temperature
0
600
1200
1800
2400
3000
-50 050 100 150
Temperature Ta(°C)
Peak Ou tp u t Current:Imax(mA
)
@:Vo*0.9
Vin=2.2V
Vbias=Vcont=2.5V
Cin= 4. 7uF(Ceram i c)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
0
100
200
300
400
500
-50 050 100 150
T emperature Ta(° C)
Q uiescen t Current: Iq(uA
)
@:Vbias=Vcont=2.5V
Vin=2.2V
Output is open
Cin=4.7uF(Ceramic)
Cbias= 0.1uF(Cer am ic )
Co=4.7uF(Ceramic)
NJM2842_1.2V
Q u iescent Current vs.Temp erat u re
NJM2842_1.2V
Line Regulation(VIN) vs.Temperatture
-0.2
-0.1
0
0.1
0.2
-50 0 50 100 150
T emp er ature T a( °C)
Line Regulation:dVo/dIo(%/V
)
@:dVin=2.2-5.5V
Vbi as=Vcont=2.5V
Io=30mA
Cin=4.7u F(Ceramic)
Cbias=0.1uF(Ceramic)
C o=4.7uF (Ceramic)
-0.2
-0.1
0
0.1
0.2
-50 0 50 100 150
T emperat ure T a( ° C)
Li n e Regul ati o n :d Vo/d I o(%/V
)
@:dVbias=2.5-5.5V
Vin=2.2V
Vcont=2.5 V
Io=30mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7 uF(Ceramic)
NJM2842_1.2V
Li ne Regulation (VBIAS) vs.Temperattu re
0
0.002
0.004
0.006
0.008
0.01
-50 050 100 150
Temperature Ta( °C)
Load Regulation:dVo/dIo(%/mA
)
@:Vin=2.2V
Vbias=V c ont=2. 5 V
Io=30-1000mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
NJM2842_1.2V
Load Regulation vs.Tem peratture
-0.1
0.1
0.3
0.5
0.7
0.9
1.1
1.3
1.5
-50 0 50 100 150 200
T emp erat ure T a( °C)
Output Voltage Vo (Vo)
@:Vbias=Vcont=2.5V
Vin=2.2V
Io=30 mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Cera mic)
Co=4.7uF(Ceramic)
NJM2842_1.2V
Output Voltage vs.Temperature
NJM2842
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-Ver.2012-02-27
0
Output Voltage:Vo(V)
Time:t(s)
46810
-0.5 -12
2
-6
0-10
Control Voltage:Vcont(V)
32
0
2-2
-4
4
0.5 -8
ON/OFF Transient Response Wit hout Loa d
3.5
2.5
1.5
1
NJM2842_1.2V
Control Voltage
Output Voltage
@:Ta=25°C
VIN=2.2V
VBIAS=2.5V
Co=4.7uF
Io=0mA
0
Output Voltage:Vo(V)
Time:t(ms)
8121620
-0.5 -12
4
0-10
0.5 -8
1-6
2-2
-4
4
Control Volta ge: V cont (V )
32
0
ON/OFF Transient Response
3.5
2.5
1.5
NJM2842_1.2V
Control Voltage
Output Voltage
@:Ta=25°C
VIN=2.2V
VBIAS=2.5V
Co=4.7uF
Io=30mA
0
NJM2842_1.2V
Load transi en t Response
1500
1.45
-1000
1.15 -1500
1.10
Output Current:Io(mA )
1.40 1000
1.35 500
1.30 0
1.25 -500
1.20
Output Voltage:Vo(V)
-2000
120 160
1.05
Time:t(µs)
-2500
20040 80
Output Current
Output Voltage
@:Ta=25°C
VIN=2.2V
VBIAS=2.5V
Co=4.7uF
Io=500-
021.6
1.16
1
-2
0
-1
-3
Time:t(ms)
1.20
Output Voltage:Vo(V)
0.4 0.8 1.2
1.26 2
5
Input Voltage:Vin(V)
1.30 4
31.28
1.24
1.18
1.32
1.22
Line transient Response(Vbias Fixed)
NJM2842_1.2V
Input Voltage
Output Voltage
@:Ta=25°C
Vcont=VBIAS=2.5V
Co=4.7uF
Io=30mA
0
Line transient Response(Vin Fixed)
NJM2842_1.2V
1.28
1.24
1.18
1.32
1.22
6
Input Voltage:Vin(V)
1.30 5
4
1.26 3
1.20 0
Output Voltage:Vo(V)
-2
0.4 0.8 1.2 2
Time:t(ms) 1.6
1.16
2
-1
1
Input Voltage
Output Voltage
@:Ta=25°C
VIN=2.2V
Co=4.7uF
Io=30mA
NM2842_1.2V
Short Circuit Current vs.Temperature
0
500
1000
1500
2000
-50 050 100 150
Temperature Ta(°C)
Short Circuit Current:Isc(mA
)
@:Vin=2.2V
Vbias=Vc ont=2.5 V
Ci n=4. 7u F (Ceramic)
Cbias=0.1uF(Ceramic)
Co= 4.7uF(Ceramic)
NJM2842
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11
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Ver.2012-02-27
[CAUTIO N]
The speci fications on thi s databook ar e only
given for information , without any guarantee
as regards eith er mistakes or omissions. Th e
application circuits in this databook are
described o nly to show rep resentative usag es
of the product and not intended for the
guarantee or permission of any rig ht including the
industrial r ights.
