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PDF NJM2841 Data sheet ( Hoja de datos )
| Número de pieza | NJM2841 | |
| Descripción | Low Output Voltage Low Dropout Regulator | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJM2841
Low Output Voltage Low Dropout Regulator
GENERAL DESCRIPTION
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
while maintaining minimum input to output voltage.
PACKAGE OUTLINE
NJM2841F
NJM2841U2
FEATURES
• Output Voltage Range
0.8V to 2.5V
• High Ripple Rejection
• Output Noise Voltage
• Output Current
• High Precision Output
• Dual Supply Voltage Type
• High Stability for Load
86 dB typ. (VO=1.2V version )
VNO=40µVrms( VO=1.2V version )
IO(min)=500mA
VO±1.0%
VIN, VBIAS(sequence free)
0.002%/mA (max)
• Output Capacitor with 4.7µF ceramic capacitor
• Low Dropout Voltage
• ON/OFF Control
0.1V typ. @IO=300mA
• Built-in Thermal Overload Protection and Over Current Protection
• Bipolar Technology
• Package Outline
SOT-23-5, SOT-89-5
PIN CONNECTION
54
12 3
NJM2841F
1. CONTROL
2. GND
3. VOUT
4. VIN
5. VBIAS
524
123
1. VOUT
2. GND
3. CONTROL
4. VBIAS
5. VIN
NJM2841U2
BLOCK DIAGRAM
VIN
VBIAS
CONTROL
Bandgap
Reference
Thermal
Protection
VOUT
GND
Over Current
Protection
Ver.2013-08-01
-1-
1 page  
NJM2841
TEST CIRCUIT
A IBIAS
VBIAS
VIN
VBIAS
0.1µF
NJM2841
A ICONT CONTROL
V VCONT
GND
VOUT
A IIN
4.7µF
VIN
4.7µF
(Ceramic)
VIOUT
VOUT
TYPICALAPPLICATION
a) In case of where ON/OFF control is not required:
VBIAS
0.1µF
R
VBIAS
VIN
NJM2841
CONTROL
VOUT
GND
4.7µF
VIN
VOUT
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
VIN
VIN
0.1µF
R
NJM2841
CONTROL
VOUT
GND
4.7µF
4.7µF
VOUT
State of control pin:
“H” → output is enabled.
“L” or “open”→ output is disabled.
Ver.2013-08-01
-5-
5 Page 
1000
750
NJM2841_1.2V
Short Circuit Current v.s. Temperature
@:VIN=2.2V
Vbias=Vcont=2.5V
Output is short to ground.
Cbias=0.1uF(Ceramic)
Cin=4.7uF(Ceramic)
Co=4. 7uF( Ceramic)
500
250
0
-50 0 50 100 150
Temperature : Ta ( oC)
NJM2841 1.2V
ON/OFF Transient Response Without Load
3.5 10
3.0
Control Voltage
2.5
5
0
2.0
@:Ta=25°C
Vin=2.2V
-5
Vbias=2.5V
1.5
Io=0mA
-10
Co=4.7uF(Ceramic)
1.0 -15
0.5
Output Voltage
0
-20
-25
-0.5
0
1
23
Time:t(s)
-30
45
1.32
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16 0
NJM2841 1.2V
Line Transient Response
Input Voltage
Output Voltage
@:Ta=25°C
CNT=Bias=2.5V
Io=30mA
Co=4.7uF(Cerami
)
0.4 0.8 1.2 1.6
Time:t(ms)
5
4
3
2
1
0
-1
-2
2 -3
Ver.2013-08-01
NJM2841
NJM2841 1.2V
ON/OFF Transient Response
3.5 10
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
0
Control Voltage
Output Voltage
@:Ta=25°C
Vin=2.2V
Vbias=2.5V
Io=30mA
Co=4.7uF(Ceramic)
4 8 12 16
Time:t(ms)
5
0
-5
-10
-15
-20
-25
-30
20
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14 0
NJM2841 1.2V
Load Transient Response
150
Output Current
Output Voltage
100
@:Ta=25°C
Vin=2.2V
Vbias=2.5V
Cin=Co=4.7uF(Ceramic)
Cbias=0.1uF(Ceramic)
50
0
-50
-100
-150
-200
-250
40 80 120 160 200
Time:t(µs)
1.32
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16 0
NJM2841 1.2V
Line Transient Response
Bias Voltage
Output Voltage
@:Ta=25°C
Vin=2.2V
Io=30mA
Co=4.7uF(Ceramic)
0.4 0.8 1.2 1.6
Time:t(ms)
6
5
4
3
2
1
0
-1
2 -2
- 11 -
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet NJM2841.PDF ] | |
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