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NJM2887
ADJUSTABLE LOW DROPOUT VOLTAGE REGULATOR
! GENERAL DESCRIPTION The NJM2887 is an adjustable low dropout voltage regulator with ON/OFF control. Advanced Bipolar technology achieves low noise, high ripple rejection and low quiescent current. It is suitable for DVD, FAX and Car Audio. ! FEATURES " High Ripple Rejection 75dB typ. (f=1kHz) " Output Noise Voltage Vno=45Vrms " Output capacitor with 2.2F ceramic capacitor " Output Current Io(max.)=500mA " High Precision Output Vref=1.27V1.0% " Low Dropout Voltage 0.18V typ. (Io=300mA) " ON/OFF Contorol " Internal Short Circuit Current Limit " Internal Thermal Overload Protection " Bipolar Technology " Package Outline TO-252-5 ! PIN CONFIGURATION
3
! PACKAGE OUTLINE
NJM2887DL2
12345
PIN FUNCTION 1.CONTROL 2. VIN 3.GND 4.VOUT 5.VADJ
NJM2887DL2 ! EQUIVALENT CIRCUIT
VIN Control Bandgap Reference VADJ Thermal Protection VOUT
GND
Ver.2004-01-16
-1-
NJM2887
! ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Input Voltage VIN Control Voltage VCONT (Ta=25C) UNIT V V mW C C
RATINGS +14 +14(*note 1) 8(Tc=25C) Power Dissipation PD 0.8(Ta25C) Operating Temperature Topr -40 +85 Storage Temperature Tstg -40 +125 (*note 1): When input voltage is less than +14V, the absolute maximum control voltage is equal to the input voltage.
! ELECTRICAL CHARACTERISTICS (VIN=Vo+1V, R1=100k, CIN=0.33uF, Co=2.2uF:Vo (Co=4.7F: Vo2.6V), Ta=25C) PARAMETER SYMBOL TEST CONDITION Io=30mA Output Voltage Vo Io=30mA Reference Voltage Vref Quiescent Current Io=0mA IQ Quiescent Current VCONT=0V IQ(OFF) at Control OFF Output Current Io Vo-0.3V Line Regulation Vo/VIN VIN=Vo+1V Vo+6.0V, Io=30mA Load Regulation Vo/Io Io=0 500mA Dropout Voltage(*note 2) VI-O Io=300mA ein=200mVrms,f=1kHz, Io=10mA Ripple Rejection RR Vo=3.0V Version Average Temperature Coefficient of Output Vo/Ta Ta=085C, Io=10mA Voltage f=10Hz80kHz, Io=10mA, Output Noise Voltage VNO Vo=3.0V Version Control Voltage for VCONT(ON) ON-state Control Voltage for VCONT(OFF) OFF-state (*note 2): Except output voltage less than 2.1V.
MIN. -1.0% 1.257 - - 500 - - - - - - 1.6 -
TYP. - 1.27 200 - 650 - - 0.18 75 50 45 - -
MAX. +1.0% 1.283 300 100 - 0.10 0.03 0.28 - - - - 0.6
UNIT V V uA nA mA %/V %/mA V dB ppm/C Vrms V V
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Ver.2004-01-16
NJM2887
! POWER DISSIPATION VS. AMBIENT TEMPERATURE
NJU2887DL2 (Topr=-40~+85C,Tj=125C,PD=8W(TC=25C),PD=0.8W(Ta25C))
10
Power Dissipation PD(W)
8 6 4 2 0 -50
Heat Sink HS=5C/W HS=10C/W HS=20C/W Without Heat Sink -25 0 25 50 75 100
Ambient Temperature Ta(C)
! TEST CIRCUIT
A
VIN
IIN
VIN
VO
0.33F
2887
R1
IOUT V VO
2.2F OR 4.7F(Vo2.6V)
A V VCONT
ICONT
CONTROL
VADJ R2 100k
GND
A IQ
Ver.2004-01-16
-3-
NJM2887
! TYPICAL APPLICATION 1 In the case where ON/OFF Control is not required:
VIN
0.33F
VIN
VO
VO
2.2F OR 4.7F(Vo2.6V)
2887
R (0300k) CONTROL
R1
VADJ
R2 100k
GND
Connect control terminal to VIN terminal The quiescent current can be reduced by using a resistance "R". Instead, it increases the minimum operating voltage. For further information, please refer to Figure "Output Voltage vs. Control Voltage".
2 In use of ON/OFF CONTROL:
VIN
VIN
VO
VO
2.2F OR 4.7F(Vo2.6V)
0.33F R
2887
R1
CONTROL
VADJ
R2 100k
GND
State of control terminal: *"H" output is enabled. *"L" or "open" output is disabled.
-4-
Ver.2004-01-16
NJM2887
[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.
Ver.2004-01-16
-5-

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