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PDF NJM2827 Data sheet ( Hoja de datos )
| Número de pieza | NJM2827 | |
| Descripción | Negative Output Low Drop Out Voltage Regulator | |
| Fabricantes | NJR | |
| Logotipo |  |
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NJM2827www.DataSheet4U.com
Negative Output Low Drop Out voltage regulator
GENERAL DESCRIPTION
The NJM2827 is a negative output low dropout regulator.
Advanced bipolar technology achieves low noise, high precision
voltage and high ripple rejection.
It has soft-start and shunt SW function. 1.0µF Output capacitor
and small package can make NJM2827 suitable for portable items.
PACKAGE OUTLINE
NJM2827F3
FEATURES
z Low Dropout Voltage
:0.13V (typ.) @Io=60mA
z High Precision Output
:±1.5%
z High Ripple Rejection
:65dB(typ.) @f=1kHz, Vo=-7V Version
z Output capacitor with 1.0µF ceramic capacitor.
z Output Current
:Io(max.)=100mA
z Soft-start Function
z Shunt SW Function
z Internal Thermal Overload Protection
z Internal Short Circuit Current Limit
z Bipolar Technology
z Package Outline
SC88A
PIN CONFIGURATION
54
123
NJM2827F3-XX
1.GND
2.VIN
3.VOUT
4.NC
5.CS
EQUIVALENT CIRCUIT
GND
CS
Thermal
Protection
Bandgap
Reference
Current
Limit
VIN VOUT
Ver.2010-07-13
-1-
1 page  
NJM2827www.DataSheet4U.com
¿Soft-start function
Capacitance Cs connect between CS pin and GND for the following.
• Control at risetime of output voltage.
• Reduces inrush current at output ON.
When the soft start function is not used, CS pin should be open.
1.Cs capacitance vs risetime of output voltage
Calculation : risetime of output voltage ∆t ≅ 213 x Cs(µF)
Cs capacity vs risetime of output voltage
250
200
150
100
50
0
0
@:Ta=25oC
V IN=6 V
CIN=0.1µF
Co =1 µF(Ceramic)
Io=0mA
0.2 0.4 0.6 0.8 1 1.2
Cs capacity : Cs(µF)
2.Inrush current at control ON
The peak value of the inrush current can be limited according to the capacitance of the Cs.
Inrush current wave :
Output Voltage
Output Voltage
Inrush current
Inrush current
Vin=Vo-1V
Cin=0.1µF(Ceramic)
Co=1µF(Ceramic)
Io=0mA
50mA/div
Cs=0µF(Open) : IPEAK =150µA
Inrush Peak Current=150mA(Cs=Open)
Vin=Vo-1V
Cin=0.1µF(Ceramic)
Co=1µF(Ceramic)
Io=0mA
20mA/div
Cs=0.0047µF : IPEAK =20µA
Inrush Peak Current=20mA(Cs=0.0047µF)
٭ This characteristic is one example. It is necessary to examine the characteristic with an actual circuit
because there is an influence by the characteristic such as output voltage/output capacitor.
Ver.2010-07-13
-5-
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet NJM2827.PDF ] | |
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