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PDF NJM2829 Data sheet ( Hoja de datos )
| Número de pieza | NJM2829 | |
| Descripción | Very Low Output Negative Voltage Regulator | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJM2829
Very Low Output Negative Voltage Regulator
GENERAL DESCRIPTION
The NJM2829 is a negative voltage regulator that delivers
up to 100mA output current with the output voltage of -0.8 to
-1.3V with ON/OFF control.
Advanced Bipolar technology achieves low noise, high ripple
rejection, and high precision voltage.
It has soft-start and shunt SW function. 2.2µF Output
capacitor and small package can make NJM2829 suitable
for portable items.
PACKAGE OUTLINE
NJM2829F3
FEATURES
• High Precision Output
VO±1.5%
• High Ripple Rejection
80dB typ. (f=1kHz, VO=-1.0V version)
• Output Capacitor with 2.2µF ceramic capacitor
• Output Current
IO(max)=100mA
• ON/OFF Control (Positive voltage control from 0V to +5V)
• Soft-start Function
• Shunt SW Function
• Built-in Thermal Overload Protection and Short Circuit Current Limit Protection
• Bipolar Technology
• Package Outline
SC-88A
PIN CONNECTION
54
123
1. GND
2. VIN
3. VOUT
4. CONTROL
5. CS
NJM2829F3
BLOCK DIAGRAM
GND
CS
Thermal
Protection
Bandgap
Reference
CONTROL
VIN
Output
Control
Current
Limit
VOUT
Ver.2012-09-07
-1-
1 page  
NJM2829
*Input Capacitor CIN
Input Capacitor CIN is 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 CIN value (refer to conditions of ELECTRIC CHARACTERISTIC) or larger and
should connect between GND and VIN 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
The recommended capacitance depends on the output voltage rank. Especially, low voltage regulator requires larger
CO value.
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.2012-09-07
-5-
5 Page 
-0.88
-0.90
-0.92
-0.94
-0.96
-0.98
-1.00
-1.02
-1.04 0
NJM2829_-1.0V
Line Transient Response
-1
-2
Input Voltage
@:Ta=25°C
Vcont=3.0V
Io=30mA
Co=2.2uF(ceramic)
Cin=0uF
-3
-4
-5
-6
Output Voltage
-7
-8
40 80 120 160 200 -9
Time:t(us)
NJM2829_-1.0V
ON/OFF Transient Response without road
24
1.5 Control Voltage
2
1 @:Ta=25°C
Vcont=3.2V
0.5 Io=0mA
Co=2.2uF(ceramic)
0 Cs=0.047uF
0
-2
-4
-0.5 -6
-1
Output Voltage
-1.5
-8
-10
-2 0 10 20 30 40 50 -12
Time:t(ms)
NJM2829
-0.90
-0.92
-0.94
-0.96
-0.98
-1.00
-1.02
-1.04
-1.06 0
NJM2829_-1.0V
Load Transient Response
150
Output Current
100
50
0
-50
-100
Output Voltage
@:Ta=25°C
Vcont=3.2V
Io=50-100mA
Co=2.2uF(ceramic)
Cin=0.1uF
-150
-200
40 80 120 160 200 -250
Time:t(µs)
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2 0
NJM2829_-1.0V
ON/OFF Transient Response
Control Voltage
@:Ta=25°C
Vcont=3.2V
Io=30mA
Co=2.2uF(ceramic)
Cs=0.047uF
Output Voltage
10 20 30
Time:t(ms)
40
4
2
0
-2
-4
-6
-8
-10
50 -12
Ver.2012-09-07
[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.
- 11 -
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet NJM2829.PDF ] | |
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