NJM2841
Low Output Voltage Low Dropout Regulator
GENERAL DESCRIPTION
PACKAGE OUTLINE
The NJM2841 is a low output voltage, low drop out
regulators.
It delivers up to 500mA output current with the output
voltage of 0.8 to 2.5V.
The use of an external bias voltage can improve the
transient response and the ripple rejection characteristics
NJM2841F
NJM2841U2
while maintaining minimum input to output voltage.
FEATURES
• Output Voltage Range
0.8V to 2.5V
• High Ripple Rejection
86 dB typ. (VO=1.2V version )
• Output Noise Voltage
VNO=40µVrms( VO=1.2V version )
• Output Current
IO(min)=500mA
• High Precision Output
VO±1.0%
• Dual Supply 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=300mA
• ON/OFF Control
• Built-in Thermal Overload Protection and Over Current Protection
• Bipolar Technology
• Package Outline
SOT-23-5, SOT-89-5
PIN CONNECTION
5
4
1. CONTROL
2. GND
3. VOUT
4. VIN
5. VBIAS
1 2 3
NJM2841F
5
2
4
1
2
3
1. VOUT
2. GND
3. CONTROL
4. VBIAS
5. VIN
NJM2841U2
BLOCK DIAGRAM
VOUT
VIN
VBIAS
Thermal
Protection
CONTROL
Bandgap
Reference
Over Current
Protection
GND
Ver.2013-08-01
-1-
NJM2841
OUTPUT VOLTAGE RANK LIST
Vout
Device Name
Device Name
NJM2841F008
NJM2841F017
0.8V
NJM2841F009
NJM2841F018
0.9V
NJM2841F010
NJM2841F019
1.0V
NJM2841F011
NJM2841F020
1.1V
NJM2841F012
NJM2841F021
1.2V
NJM2841F013
NJM2841F022
1.3V
NJM2841F014
NJM2841F023
1.4V
NJM2841F015
NJM2841F024
1.5V
NJM2841F016
NJM2841F025
1.6V
Output Voltage Range: 0.8V to 2.5V (0.1V step)
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYNBOL
Input Voltage
VIN
Bias Voltage
VBIAS
Control Voltage
VCONT
Power Dissipation
Operating Temperature
Storage Temperature
PD
Topr
Tstg
Vout
1.7V
1.8V
1.9V
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
Device Name
NJM2841U2-012
Vout
1.2V
(Ta=25°C)
RATINGS
UNIT
+10
V
+10
V
+10
V
480(*1)
SOT-23-5
640(*2)
mW
625(*3)
SOT-89-5
2400(*4)
-40 ∼ +85
°C
-50 ∼ +150
°C
(*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 2Layers)
(*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JDEC standard, 4Layers), internal Cu area: 74.2×74.2mm
(*3): Mounted on glass epoxy board. (76.2 × 114.3 × 1.6mm:based on EIA/JDEC standard size, 2Layers, Cu area 100mm2)
(*4): 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)
BIAS VOLTAGE RANGE
VBIAS= +2.5V to +10V (VO<1.5V)
VBIAS= VO+1V to +10V (VO≥1.5V)
-2-
Ver.2013-08-01
NJM2841
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
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
SYMBOL
VO
IBIAS
IIN
IBIAS(OFF)
IIN(OFF)
IO
∆VO/∆VBIA
S
∆VO/∆VIN
∆VO/∆IO
∆VI-O
TEST CONDITION
IO=30mA
IO=0mA, except ICONT
IO=0mA, except ICONT
VCONT=0V
VCONT=0V
VO x 0.9V
VBIAS=2.5V to VO+6V(VO<1.5V)
VBIAS=VO+1V to VO+6V(VO≥1.5V)
IO=30mA
VIN=VO+1V to VO+6V, IO=30mA
IO=30 to 500mA
IO=300mA
VBIAS=3.5V,
RR1(VBIAS) eBIAS=200mVrms, f=1kHz,
IO=10mA
eIN=200mVrms, f=1kHz,
RR2(VIN)
IO=10mA
∆VO/∆Ta
VNO
ICONT
Ta=0 to +85°C, IO=10mA
f=10Hz to 80kHz, IO=10mA
VCONT=1.6V
ICONT(ON)
VCONT(ON)
VBIAS
VIN
MIN.
TYP.
MAX.
UNIT
-1.0%
500
180
650
+1.0%
300
20
100
100
-
V
µA
µA
nA
nA
mA
-
-
0.10
%/V
-
0.10
0.10
0.002
0.18
%/V
%/mA
V
Refer to Table 1
dB
Refer to Table 1
dB
±50
1.6
-
-
Refer to Table 1
3
12
0.6
10
9
ppm/°C
µVrms
µA
V
V
V
V
• Table1
PARAMETER
Ripple Rejection Ratio 1 (VBIAS)
Ripple Rejection Ratio 2 (VIN)
Output Noise Voltage
SYMBOL
RR(VBIAS)
TEST CONDITION
VBIAS=3.5V,
eBIAS=200mVrms,
f=1kHz, Io=10mA
VO=0.8V
VO=0.9V
VO=1.0V
VO=1.2V
VO=1.5V
MIN.
-
TYP.
80
80
79
77
75
MAX.
-
VBIAS=4.5V,
eBIAS=200mVrms,
f=1kHz, Io=10mA
VO=2.5V
-
70
-
VO=0.8V
VO=0.9V
VO=1.0V
VO=1.2V
VO=1.5V
VO=2.5V
VO=0.8V
VO=0.9V
VO=1.0V
VO=1.2V
-
87
87
87
86
85
75
27
30
34
40
48
75
-
RR(VIN)
ein=200mVrms,
f=1kHz, Io=10mA
VNO
f=10Hz∼80kHz,
Io=10mA,
VO=1.5V
VO=2.5V
Ver.2013-08-01
UNIT
dB
dB
µVrms
-3-
NJM2841
POWER DISSIPATION vs. AMBIENT TEMPERATURE
NJM2841F PowerDissipation
(Topr=-40~+85°C,Tj=150°C)
Power Dissipation PD(mW)
600
on 2 layers board
500
400
300
Device itself
200
100
0
-50
-25
0
25
50
75
100
125
100
125
150
Temperature : Ta(°C)
NJM2841U2 PowerDissipation
(Topr=-40~+85°C,Tj=150°C)
3000
Power Dissipation PD(mW)
on 4 layers board
2500
2000
1500
1000
on 2 layers board
500
0
-50
-25
0
25
50
75
150
Temperature : Ta(°C)
-4-
Ver.2013-08-01
NJM2841
TEST CIRCUIT
A
IBIAS
VBIAS
NJM2841
0.1µF
A
ICONT
A
VIN
VBIAS
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
NJM2841
R
CONTROL
VOUT
VOUT
GND
4.7µF
(ceramic)
Connect control pin to VBIAS pin.
Though the ICONT decreases by inserting "R" to between Control pin and VBIASpin, the minimum operating voltage is increased
due to the resistor "R".
b) In use of ON/OFF control:
VBIAS
VBIAS
NJM2841
0.1µF
VIN
VIN
4.7µF
R
CONTROL
GND
VOUT
VOUT
4.7µF
State of control pin:
“H” → output is enabled.
“L” or “open”→ output is disabled.
Ver.2013-08-01
-5-
NJM2841
* Bias Capacitor CBIAS and an Input Capacitor 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 recommended CBIAS and CIN value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger
and should connect between VBIAS - GND, 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 though this product is designed stability works with wide range ESR of capacitor including low ESR
products.
-6-
Ver.2013-08-01
NJM2841
TYPICAL CHRACTERISTICS
NJM2841_1.2V
Output Voltage vs. Input Voltage
1.5
NJM2841_1.2V
Output Voltage vs. Input Voltage
1.5
1.4
Io=0A
1.3
1
1.2
Io=0A
1.1
Io=100mA
0.5
1
Io=300mA
o
@:Ta=25 C
VIN=2.2V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
o
@:Ta=25 C
VBIAS=CNT=2.5V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
0.9
0.8
1
1.2
1.4
1.6
1.8
0
2
0
0.5
1
Input Voltage : V IN(V)
1.5
2
Input Voltage : V
NJM2841_1.2V
Output Voltage vs. Output Current
3
NJM2841_1.2V
Ground Pin Current vs. Output Current
1
1.5
2.5
(V)
BI AS
o
@:Ta=25 C
VIN=2.2V
CNT=Vbias=2.5V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
0.8
1
o
0.6
@:Ta=25 C
VIN=2.2V
Vbias=CNT=2.5V
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
0.4
0.5
0.2
0
0
0
200
400
600
800
1000
0
1200
100
Output Current : Io(mA)
200
300
400
500
Output Current : Io(mA)
NJM2841_1.2V
Control Current vs. Control Voltage
20
NJM2841_1.2V
Output Voltage vs. Control Voltage
1.5
o
@:Ta=25 C
VIN=2.2V
VBIAS=2.5V
Cin=Co=4.7uF (Ceramic)
Cbias=0.1uF(Ceramic)
Io=30mA
15
Rc=0
1
Rc=50k
10
Rc=100k
Rc=0
Rc=50k
0.5
o
@:Ta=25 C
VIN=2.2V
VBIAS=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Io=30mA
5
Rc=100k
0
0
0
0.5
1
1.5
2
Control Voltage : Vcont(V)
Ver.2013-08-01
2.5
3
0
0.5
1
1.5
2
2.5
3
Control Voltage : Vcont(V)
-7-
NJM2841
NJM2841_1.2V
Load Regulation vs. Output Current
NJM2841_1.2V
Peak Output Current vs. Input Voltage
1400
0
1200
-10
1000
-20
800
600
-30
400
o
@:Ta=25 C
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
IntegrationTime:1ms
MeasureDelay:1ms
PulseWidth:5ms
o
@:Ta=25 C
Vin=2.2V
Vbias=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
-40
200
0
-50
0
200
400
600
800
0
1000
2
4
6
8
10
Input Voltage : V IN(V)
Output Current : Io(mA)
NJM2841_1.2V
Quiescent Current v.s. Input Voltage
NJM2841_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
CNT=2.5V
Output is open.
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF (Ceramic)
800
Including Icont
6
600
4
400
2
200
0
0
0
2
4
6
8
10
0
2
Input Voltage : V IN(V)
NJM2841_1.2V
Dropout Voltage vs. Output Current
0.8
4
6
8
100
NJM2841_1.2V
Output Noise Voltage vs. Output Current
o
@:Ta=25 C
Vbias=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
0.7
10
Input Voltage : V BIAS(V)
o
@:Ta=25 C
VIN=2.2V
VBIAS=CNT=2.5V
Cin=Co=4.7uF
Cbias=0.1uF
80
0.6
0.5
60
0.4
40
0.3
0.2
20
0.1
LPF:80kHz
0
0
200
400
600
Output Current:Io(mA)
-8-
800
1000
0
0.001
0.01
0.1
1
10
100
Output Current : Io(mA)
Ver.2013-08-01
NJM2841
NJM2841_1.2V
Ripple Rejection Ratio[Vbias] v.s. Frequency
NJM2841_1.2V
Ripple Rejection(Vin-Vout) vs. Output Current
100
100
Io=0mA
Io=30mA
Io=100mA
90
90
80
80
Io=300mA
f=1KHz
70
70
60
f=10KHz
60
50
50
o
o
@:Ta=25 C
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
VIN=2.2V
VBIAS=3.5V
ebias=200mVrms
40
30
10
40
30
1K
100
100K
10K
@:Ta=25 C
VIN=2.2V
VBIAS=2.5V
ein=200mVrms
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
20
0.001
0.01
Frequency : f (Hz)
1
10
100
NJM2841_1.2V
Equivalent Serise Resistance vs. Output Current
NJM2841_1.2V
Ripple Rejection(Vbias-Vout) vs. Output Current
100
0.1
Output Current : Io(mA)
100
f=1KHz
80
10
@:Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
VIN=1.3V-10V
VBIAS=2.5V-10V
60
f=10KHz
STABLE REGION
1
40
o
@:Ta=25 C
VIN=2.2V
VBIAS=3.5V
ein=200mVrms
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
20
0
0.001
0.01
0.1
0.1
1
10
0.01
0.001
100
Output Current : Io(mA)
0.01
0.1
1
10
100
10
3
Output Current : Io(mA)
NJM2841_1.2V
Control Voltage v.s. Temperature
NJM2841_1.2V
Output Voltage v.s. Temperature
2
1.25
@:VIN=2.2V
Vbias= 2.5V
Io=30mA
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
1.5
@:Vbias= Vcont=2.5V
Vin=2.2V
Io=30mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
1.225
1
1.2
0.5
1.175
0
1.15
-50
0
50
100
o
Temperature : Ta ( C)
Ver.2013-08-01
150
-50
0
50
100
150
Temperature Ta ( o C)
-9-
NJM2841
NJM2841_1.2V
Peak Output Current v.s. Temperature
NJM2841_1.2V
Quiescent Current v.s. Temperature
300
1000
250
800
200
600
150
400
100
@:VIN=2.2V
Vbias=Vcont=2.5V
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
200
Vbias=Vcont=2.5V
Vin=2.2V
Output is open
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
50
0
0
-50
0
50
100
150
-50
0
50
o
100
150
Temperature : Ta ( o C)
Temperature : Ta ( C)
NJM2841_1.2V
Line Regulation(VBIAS) v.s. Temperature
NJM2841_1.2V
Line Regulation(VIN) v.s. Temperature
0.2
0.2
@:dVIN=2.2-7.2V
Vbias= Vcont=2.5V
Io=30mA
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
0.1
@:dVbias=2.5-7.2V
VIN= Vcont=2.2V
Io=30mA
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
0.1
0
0
-0.1
-0.1
-0.2
-0.2
-50
0
50
100
150
-50
o
0
50
100
150
o
Temperature : Ta ( C)
Temperature : Ta ( C)
NJM2841_1.2V
Load Regulation v.s. Temperature
NJM2841_1.2V
Output Voltage v.s. Temperature
0.01
1.5
@:VIN=2.2V
Vbias= Vcont=2.5V
Io=30-500mA
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
0.008
1
0.006
0.004
0.5
@:VBIAS= CONT=2.5V
Vin=2.2V
Io=30mA
Cin=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
Co=4.7uF(Ceramic)
0.002
0
0
-50
0
50
100
o
Temperature : Ta ( C)
- 10 -
150
-50
0
50
100
150
200
o
Temperature Ta ( C)
Ver.2013-08-01
NJM2841
NJM2841_1.2V
Short Circuit Current v.s. Temperature
500
250
10
3.0
5
Control Voltage
2.5
0
50
o
100
0
@:Ta=25°C
Vin=2.2V
Vbias=2.5V
Io=30mA
Co=4.7uF(Ceramic)
2.0
1.5
-15
-20
0
-25
0
4
8
12
16
Temperature : Ta ( C)
Time:t(ms)
NJM2841 1.2V
NJM2841 1.2V
Load Transient Response
ON/OFF Transient Response Without Load
1.5
-5
-10
-15
1.0
0.5
-20
100
Output Current
Output Voltage:Vo(V)
@:Ta=25°C
Vin=2.2V
Vbias=2.5V
Io=0mA
Co=4.7uF(Ceramic)
Control Voltage:Vcont(V)
0
2.0
150
1.28
5
Control Voltage
2.5
-30
20
1.30
10
3.0
-10
0.5
150
3.5
-5
Output Voltage
1.0
-0.5
0
-50
Output Voltage:Vo(V)
3.5
1.26
50
@:Ta=25°C
Vin=2.2V
Vbias=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
1.24
1.22
0
-50
1.20
-100
Output Voltage
1.18
-150
1.16
-200
Output Current:Io(mA)
750
Output Voltage:Vo(V)
@:VIN=2.2V
Vbias=Vcont=2.5V
Output is short to ground.
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4.7uF(Ceramic)
Control Voltage:Vcont(V)
NJM2841 1.2V
ON/OFF Transient Response
1000
Output Voltage
0
-25
-0.5
-30
0
1
2
3
4
5
1.14
Time:t(s)
-250
0
40
120
80
160
200
Time:t(µs)
5
1.32
6
1.30
4
1.30
5
3
1.28
1.28
Input Voltage
1.26
2
@:Ta=25°C
CNT=Bias=2.5V
Io=30mA
Co=4.7uF(Cerami
)
1.24
1.22
1
0
Output Voltage
0.8
1.2
Time:t(ms)
Ver.2013-08-01
1.6
2
3
@:Ta=25°C
Vin=2.2V
Io=30mA
Co=4.7uF(Ceramic)
1.24
1.22
2
1
Output Voltage
-2
1.18
-1
-3
1.16
1.18
0.4
1.26
0
-1
0
4
Bias Voltage
1.20
1.20
1.16
Output Voltage:Vo(V)
1.32
0
0.4
0.8
1.2
1.6
2
-2
Time:t(ms)
- 11 -
Input Voltage:Vbias(V)
NJM2841 1.2V
Line Transient Response
Input Voltage:Vin(V)
Output Voltage:Vo(V)
NJM2841 1.2V
Line Transient Response
NJM2841
[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.
- 12 -
Ver.2013-08-01