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PDF NJM2828 Data sheet ( Hoja de datos )
| Número de pieza | NJM2828 | |
| Descripción | Negative Output Low Drop Out voltage regulator | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJM2828
Negative Output Low Drop Out voltage regulator
GENERAL DESCRIPTION
The NJM2828 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 NJM2828 suitable for portable items.
PACKAGE OUTLINE
SC88A
NJM2828F3
FEATURES
z Low Current Consumption 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 0.1F ceramic capacitor.
z Output Current
Io(max.)=100mA
z ON/OFF Control(Positive voltage control from 0 to +5V)
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
1.GND
2.VIN
3.VOUT
4.CONTROL
5.CS
NJM2828F3-XX
EQUIVALENT CIRCUIT
GND
CS
Thermal
Protection
Bandgap
Reference
Current
Limit
CONTROL
VIN
Output
Control
VOUT
Ver.2007-02-23
-1-
1 page  
NJM2828
www.DataSheet4U.com
TYPICALAPPLICATIONS
¿ON/OFF control
ON/OFF control can be achieved by applying positive control voltage to CONTROL terminal.
Apply positive Vcont ("H") to make chip to be ON (Enabled), and either Vcont is "L" or open (High Z) to make chip to
be OFF (Disabled).
The relations between Vcont and the state is as follows:
Vcont +1.6V ≤ Vcont ≤ +5V ("H" level):
Vcont 0V ≤ Vcont ≤ +0.6V ("L" level):
Vcont +0.6V < Vcont < +1.6V ("L" level):
ON state
OFF state
Undefined
In case ON/OFF control is not used, keep applying positive Vcont to CONTROL terminal to make chip ON.
Note that negative Vcont does not make the chip enabled.
0.1µF
VIN
CONTROL
R
1.0µF*4
(Ceramic
GND
VIN VOUT
ＮＪＭ2828
CONTROL CS
VOUT
Cs=0.047µF
CS
*4 -2.2V≤Vo< -2.0V version : Co=2.2µF
Vo≥-2.0V version : Co=4.7µ F
In the case of using a resistance "R" between VIN and control.
The current flow into the control terminal while the IC is ON state (ICONT) can be reduced when a pull up resistance
"R" is inserted between VIN and the control terminal.
The minimum control voltage for ON state (VCONT (ON)) is increased due to the voltage drop caused by ICONT and the
resistance "R". The ICONT is temperature dependence as shown in the "Control Current vs. Temperature"
characteristics. Therefore, the resistance "R" should be carefully selected to ensure the control voltage exceeds the
VCONT (ON) over the required temperature range.
¿Input Capacitance CIN
Input capacitance CIN is required to prevent oscillation and reduce power supply ripple for applications with high
power supply impedance or a long power supply line.
Use the CIN value of 0.1µF greater to avoid the problem.
CINshould connect between GND and VINas short as possible.
Ver.2007-02-23
-5-
5 Page 
www.DataSheet4U.com
ELECTRICAL CHARACTERISTICS
NJM2828/-7.0V
100 Equivalent Serise Resistance vs. Output Current
@:Ta=25oC
Co=1.0 µF( Cera mic)
10
1 STABLE REGION
0.1
0.01
0.001
0.01
0.1
1
10
Output Current : Io(mA)
100
NJM2828/-7.0V
2 Control Voltage v.s. Tem perature
1.5
1
0.5
@:VIN=-8.0V
Io=30mA
Co=1.0µF(Ceramic)
0
-50 0
50 100
Temperature : Ta (oC)
150
NJM2828/-7.0V
CS Charge Current v.s. Temperature
10
@:VIN=-8.0V
CS is short to ground.
Co =1.0 µF(Ce ra mic)
8
6
4
2
0
-50 0
50 100 150
Temperature : Ta (oC)
Ver.2007-02-23
NJM2828
0.3
0.25
0.2
0.15
0.1
0.05
0
-50
NJM2828/-7.0V
Dropout Voltage v.s. Temperature
@:Io=60mA
Co=1µF(Ceramic)
0 50 100
Temperature : Ta (oC)
150
NJM2828/-7.0V
7.2 Output Voltage v.s. Temperature
@:VIN=-8.0V
Io=30mA
Co=1.0µF(Ceramic)
7.1
7
6.9
6.8
-50
0 50 100
Temperature Ta (oC)
150
NJM2828/-7.0V
250 Quiescent Current v.s. Temperature
200
Iq+Icont
150
Iq
100
50
0
-50
@:VIN=-8.0V
Output is open.
Co =1 .0 µF(Ceramic)
0 50 100
Temperature : Ta (oC)
150
- 11 -
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NJM2828.PDF ] | |
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