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Fairchild Semiconductor
Fairchild Semiconductor

LM2931A Datasheet

Low Dropout Voltage Regulator


LM2931A Datasheet Preview


LM2931A
Low Dropout Voltage Regulator
www.fairchildsemi.com
Features
• Limited input voltage and high efficiency.
• Internal thermal over load protection.
• 60V load dump protection.
• Output current up to 0.1A.
Description
LM2931A is a fixed 3-terminal low dropout voltage
regulator designed to need very low quiescent current.
Internally, implemented circuits include 60V load dump
protection, -50V reverse transient short circuit and thermal
over load protection.
TO-92
1
1: Output 2: GND 3: Input
Internal Block Diagram
InVpIut
3
0.6V MAX DROP
PASS ELEMENT
OVER VOLTAGE
PROTECTION
CURRENT LIMIT
START
OVuO tput
1
GND
2
THERMAL SHUTDOWN
REFERENCE VOLTAGE
©2001 Fairchild Semiconductor Corporation
Rev. 1.0.0
Page 1

LM2931A
Absolute Maximum Ratings
Parameter
Input Voltage
Over Protection Voltage
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Symbol
Vi
V(OP)
TOPR
TJ
TSTG
Value
33
60
-40~+125
150
-65~+150
Unit
V
V
°C
°C
°C
Electrical Characteristics
(VI =14V, IO =10mA, CO =100µF, TA = 25 oC)
Parameter
Output Voltage (I)
Output Voltage (II)
Line Regulation (I)
Line Regulation (II)
Load Regulation
Output Impedance
Quiescent Current (I)
Quiescent Current (II)
Output Noise Voltage
Ripple Rejection
Dropout Voltage (I)
Dropout Voltage (II)
Max Operational Input
Voltage
Max Line Transient
Reverse Polarity Input
Voltage DC
Reverse Polarity Input
Voltage Transient
Peak Output Current
Symbol
Conditions
VO (I) VI = 14V, IO = 10mA
VO (II)
VI = 6 ~ 26V, IO = 100mA
TJ = -40 ~ +125 oC
VO (I) VI = 9 ~ 16V, IO = 10mA
VO (II) VI = 6 ~ 26V, IO = 10mA
VO (III) VI = 14V, IO = 5 ~ 100mA
ZO VI = 14V, IO = 100mA
IQ (I) VI = 6 ~ 26V, IO 10mA
IQ (II) VI = 14V, IO 100mA
VN
VI = 14V, IO = 10mA,
f = 10Hz ~ 100KHz
RR VI = 14V, IO = 10mA, f = 120Hz
VD (I) IO = 10mA, VD = VI - VO
VD (II) IO = 100mA, VD = VI - VO
VIN IO = 10mA
VLT(MAX)
VI = 14V, IO =10mA,
Time =100ms
VI(DC) VI = 14V, IO = 10mA, VO -0.3V
Min.
4.81
4.75
-
-
-
-
-
-
-
55
-
-
26
60
- 15
VI(TR)
IPK
VI = 14V, IO = 10mA, Time 10ms
VI = 14V
- 50
200
Typ.
5.0
5.0
2.0
4.0
10
100
0.1
5.0
150
80
0.03
0.1
33
70
- 30
- 80
400
Max.
5.19
Unit
V
5.25 V
10 mV
30 mV
50 mV
600 m
1.0 mA
30 mA
1000 µVrms
- dB
0.2 V
0.6 V
-V
-V
-V
-V
600 mA
2
Page 2

Typical Perfomance Characteristics
FIG.1 Output Voltage
vs. Input Voltage
7
6
5
4
3
2
1
0
0 5 10 15
Input voltage Vin (V)
Figure 1. Output Voltage vs. Input Voltage
FIG.3 Ripple Rejection
vs. Output Voltage
90
85
VIN = 14V
VOUT = 5.0V
75 f = 120
TJ = 25
65
0
20 40
60
80 100
Output Current ()
Figure 3. Ripple Rejection vs. Output Voltage
FIG.5 Output Voltage
vs. Temperature(Tj)
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
-25
0 25 50 75 100 125
Temperature Tj()
Figure 5. Output Voltage vs. Temperature(Tj)
LM2931A
FIG.2 Quiescent
vs. Input Voltage
10
8.0
6.0
4.0
2.0
0
0
RL= 50
RL= 500
10 20
30
40
Input voltage Vin (V)
50
Figure 2. Quiescent Current vs. Input Voltage
FIG.4 Drop Voltage
vs. Output Current
240
VIN = 14V
200 VOUT = 100
TJ = 25
160
120
80
40
0
0 20 40 60 80 100 120
Output Current ()
Figure 4. Drop Voltage vs. Output Current
FIG.6 Quiescent Current
vs. Temperature(Tj)
1
0.8
0.6
0.4
0.2
0
-25
0 25 50 75 100 125
Junction temperature Tj()
Figure 6. Quiescent Current vs. Temperature(Tj)
3
Page 3
Part Number LM2931A
Manufactur Fairchild Semiconductor
Description Low Dropout Voltage Regulator
Total Page 8 Pages
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