Fairchild Semiconductor LM2931A Datasheet
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.
Internal Block Diagram
Description
LM2931A is a fixed 3-termina l low dropout voltage
regulator designed to need very low quiescent current.
Internally, implemented circuits include 60V load dump
protection, -50V reverse transi ent short circuit and t hermal
over load protection.
TO-92
1
1: Output 2: GND 3: Input
Input
V
I
3
OVER VOLTAGE
START
THERMAL SHUTDOWN
GND
2
©2001 Fairchild Semiconductor Corporation
PROTECTION
0.6V MAX DROP
PASS EL EMENT
CURRENT LIMIT
+
_
REFERE NCE VOLT AGE
V
Output
O
1
Rev. 1.0.0
LM2931A
Absolute Maximum Ratings
Parameter Symbol Value Unit
Input Voltage Vi 33 V
Over Protection Voltage V
Operating Temperature Range T
Maximum Junction Temperature T
Storage Temperature Range T
(OP)
OPR
J
STG
60 V
-40~+125 °C
150 °C
-65~+150 °C
Electrical Characteristics
(VI =14V , IO =10mA, CO =100µF, T
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage (I) V
Output Voltage (II) V
Line Regulation (I) ∆V
Line Regulation (II) ∆V
Load Regulation ∆V
Output Impedance Z
Quiescent Current (I) I
Quiescent Current (II) I
Output Noise Voltage V
Ripple Rejection RR V
Dropout Voltage (I) V
Dropout Voltage (II) V
Max Operational Input
Voltage
Max Line Transient V
Reverse Polarity Input
Voltage DC
Reverse Polarity Input
Voltage Transient
Peak Output Current I
25 oC)
A =
(I) VI = 14V, IO = 10mA 4.81 5.0 5.19 V
O
V
= 6 ~ 26V, IO = 100mA
(II)
O
(I) VI = 9 ~ 16V, IO = 10mA - 2.0 10 mV
O
(II) VI = 6 ~ 26V, IO = 10mA - 4.0 30 mV
O
(III) VI = 14V, IO = 5 ~ 100mA - 10 50 mV
O
O
(I) VI = 6 ~ 26V, I
Q
(II) VI = 14V, I
Q
N
(I) IO = 10mA, VD = VI - V
D
(II) IO = 100mA, VD = VI - V
D
V
IN
LT(MAX)
V
I(DC)
V
I(TR)
PK
I
T
= -40 ~ +125 oC
J
4.75 5.0 5.25 V
VI = 14V, IO = 100mA - 100 600 mΩ
≤10mA - 0.1 1.0 mA
O
≤ 100mA - 5.0 30 mA
O
VI = 14V, IO = 10mA,
f = 10Hz ~ 100KHz
= 14V, IO = 10mA, f = 120Hz 55 80 - dB
I
O
O
- 150 1000 µVrms
-0.030.2V
-0.10.6V
IO = 10mA 26 33 - V
VI = 14V, IO =10mA,
Time =100ms
VI = 14V, IO = 10mA, V
-0.3V - 15 - 30 - V
≥
O
60 70 - V
VI = 14V, IO = 10mA, Time ≤ 10ms - 50 - 80 - V
VI = 14V 200 400 600 mA
2
Typical Perfomance Characteristics
LM2931A
FIG.1 Output Voltage
vs. Input Voltage
7
6
5
4
3
2
Output voltage Vo(V)
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
V
= 5.0V
OUT
75
f = 120
㎐
= 25
T
J
Ripple Rejection Ratio(
65
0 20 40 60 80 100
℃
Output Current (㎃)
FIG.2 Quiescent
vs. Input Voltage
10
8.0
6.0
4.0
2.0
Quiescent current Iq(mA)
0
RL= 50
Ω
RL= 500
Ω
0 10 20 30 40 50
Input voltage Vin (V)
Figure 2. Quiescent Current vs. Input Voltage
FIG.4 Drop Voltage
vs. Output Current
240
)
㎷
VIN = 14V
Dropout voltage Vdrop(
200
160
120
80
40
△
V
T
= 25
J
0
0
㎷
= 100
OUT
℃
20 40 60
Output Current (㎃)
100
120
80
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
Outout voltage Vo(V)
4.94
4.92
-25
Tem perature T j(℃)
Figure 5. Output Voltage vs. Temperature(Tj)
75
12502550 100
Figure 4. Drop Voltage vs. Output Current
FIG.6 Quiescent Current
vs. Temperature(Tj)
1
0.8
0.6
0.4
0.2
Quiescent current Iq(mA)
0
02550
-25
Juncti on temperature Tj(℃)
Figure 6. Quiescent Current vs. Temperature(Tj)
75
100
125
3
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