L4940 [STMICROELECTRONICS]
VERY LOW DROP 1.5 A REGULATORS; 非常低的压差1.5A的稳压器
| 型号： | L4940 |
| 厂家： | 
ST |
| 描述： | VERY LOW DROP 1.5 A REGULATORS |
| 文件： | 总13页 (文件大小：131K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L4940 series
VERY LOW DROP 1.5 A REGULATORS
■
■
PRECISE 5 V, 8.5 V, 10 V, 12 V OUTPUTS
LOW DROPOUT VOLTAGE(500 mV typ
at 1.5A)
■
■
■
■
VERY LOW QUIESCENT CURRENT
THERMAL SHUTDOWN
SHORT CIRCUIT PROTECTION
REVERSEPOLARITY PROTECTION
DESCRIPTION
The L4940 series of three terminal positive
regulators is available in TO-220 and D2PAK
package and with several fixed output voltages,
making it useful in a wide range of industrial and
consumer applications. Thanks to its very low
input/output voltage drop, these devices are
particularly suitable for battery powered
TO-220
D2PAK
TO-263
equipments,
reducing
consumption
and
prolonging battery life. Each type employs
internal current limiting, antisaturation circuit,
thermal shut-down and safe area protection.
BLOCK DIAGRAM
1/13
November 1999
L4940 series
PIN CONNECTION AND ORDER CODES
ORDERING NUMBERS
OUTPUT VOLTAGE
TO-220
L4940V5
L4940V85
L4940V10
L4940V12
D2PAK
L4940D2T5
L4940D2T85
L4940D2T10
L4940D2T12
5V
8.5V
10V
12V
ABSOLUTE MAXIMUM RATING
Symbol
Description
Values
Unit
V
VI
Forward Input Voltage
Reverse Input Voltage
30
VIR
-15
V
VO = 5 V
R = 100
O
Ω
Ω
Ω
Ω
VO = 8.5V R = 180
O
VO = 10 V R = 200
O
VO = 12 V R = 240
O
IO
Output Current
Internally Limited
Internally Limited
-40 to 150
Ptot
Power Dissipation
Tj, Tstg Junction and Storage Temperature
oC
THERMAL DATA
Symbol
Description
Value
Unit
TO-220
D2PAK
Rthj-case Thermal Resistance Junction-case
Rthj-amb Thermal Resistance Junction-ambient Max
Max
3
50
3
62.5
oC/W
oC/W
2/13
L4940 series
TEST CIRCUITS
Figure 1 : DC Parameter.
Figure 2 :
Load Rejection.
Figure 3 : Ripple Rejection.
3/13
L4940 series
o
ELECTRICAL CHARACTERISTICS FOR L4940V5
(refer to the test circuits, Tj = 25 C,
Vi = 7V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Io = 500 mA
Min.
4.9
Typ.
Max.
5.1
Unit
V
5
5
Vo
Output Voltage
Io = 5 mA to 1500 mA
Vi = 6.5to 16 V
4.8
5.2
V
Vi
Operating Input Voltage
LineRegulation
Io = 5 mA
17
10
V
Io = 5 mA Vi = 6 to 17V
4
mV
mV
V
V
∆
∆
o
o
Load Regulation
Io = 5 to 1500 mA
Io = 500 to 1000mA
8
5
25
15
IQ
Quiescent Current
Io = 5 mA
Io = 1.5A Vi = 6.5V
5
30
8
50
mA
mA
Quiescent Current Change
Output Voltage Drift
Io = 5 mA
Io = 1.5A Vi = 6.5to 16 V
3
15
I
∆
Q
0.5
68
mV/oC
∆Vo
∆T
SVR Supply Voltage Rejection
Io = 1 A
f= 120 Hz
58
dB
Vd
Dropout Voltage
Io = 0.5A
Io = 1.5A
200
500
400
900
mV
Isc
Short Circuit Current
Vi = 14 V
Vi = 6.5V
2
2.2
2.7
2.9
A
ELECTRICAL CHARACTERISTICS FOR L4940V85(refer to the test circuits, Tj = 25 oC,
Vi = 10.5V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Io = 500 mA
Min.
8.3
Typ.
8.5
Max.
8.7
Unit
V
Vo
Output Voltage
Io = 5 mA to 1500 mA
Vi = 10.2to 16 V
8.15
8.5
8.85
V
Vi
Operating Input Voltage
LineRegulation
Io = 5 mA
17
9
V
Io = 5 mA Vi = 9.5to 17 V
4
mV
mV
V
∆
o
Load Regulation
Io = 5 to 1500 mA
Io = 500 to 1000mA
12
8
30
16
∆Vo
IQ
Quiescent Current
Io = 5 mA
Io = 1.5A Vi = 10.2V
4
30
8
50
mA
mA
Quiescent Current Change
Output Voltage Drift
Io = 5 mA
Io = 1.5A Vi = 10.2to 16 V
2.5
15
I
∆
Q
0.8
66
mV/oC
∆Vo
T
∆
SVR Supply Voltage Rejection
Io = 1 A
f= 120 Hz
58
dB
Vd
Dropout Voltage
Io = 0.5A
Io = 1.5A
200
500
400
900
mV
Isc
Short Circuit Current
Vi = 14 V
Vi = 10.2V
2
2.2
2.7
2.9
A
4/13
L4940 series
o
ELECTRICAL CHARACTERISTICS FOR L4940V10
(refer to the test circuits, Tj = 25 C,
Vi = 12V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Io = 500 mA
Min.
9.8
Typ.
10
Max.
10.2
10.4
Unit
V
Vo
Output Voltage
Io = 5 mA to 1500 mA
Vi = 11.7to 16 V
9.6
10
V
Vi
Operating Input Voltage
LineRegulation
Io = 5 mA
17
8
V
Io = 5 mA Vi = 11 to 17 V
3
mV
mV
V
V
∆
∆
o
o
Load Regulation
Io = 5 to 1500 mA
Io = 500 to 1000mA
15
10
35
20
IQ
Quiescent Current
Io = 5 mA
Io = 1.5A Vi = 11.7V
4
30
8
50
mA
mA
Quiescent Current Change
Output Voltage Drift
Io = 5 mA
Io = 1.5A Vi = 11.7to 16 V
2
13
I
∆
Q
1
mV/oC
∆Vo
∆T
SVR Supply Voltage Rejection
Io = 1 A
f= 120 Hz
56
62
dB
Vd
Dropout Voltage
Io = 0.5A
Io = 1.5A
200
500
400
900
mV
Isc
Short Circuit Current
Vi = 14 V
Vi = 11.7V
2
2.2
2.7
2.9
A
A
ELECTRICAL CHARACTERISTICS FOR L4940V12(refer to the test circuits, Tj = 25 oC,
Vi = 14V, Ci = 0.1 µF, Co = 22 µF unless otherwise specified)
Symbol
Vo
Parameter
Output Voltage
Test Conditions
Io = 500 mA
Min.
11.75
11.5
Typ.
12
Max.
12.25
12.5
Unit
V
Vo
Output Voltage
Io = 5 mA to 1500 mA
Vi = 13.8to 17 V
12
V
Vi
Operating Input Voltage
LineRegulation
Io = 5 mA
17
7
V
Io = 5 mA Vi = 13 to 17 V
3
mV
mV
V
∆
o
Load Regulation
Io = 5 to 1500 mA
Io = 500 to 1000mA
15
10
35
25
∆Vo
IQ
Quiescent Current
Io = 5 mA
Io = 1.5A Vi = 13.8V
4
30
8
50
mA
mA
Quiescent Current Change
Output Voltage Drift
Io = 5 mA
Io = 1.5A Vi = 13.8to 16 V
1.5
10
∆IQ
∆Vo
1.2
61
mV/oC
T
∆
SVR Supply Voltage Rejection
Io = 1 A
f= 120 Hz
Io = 0.5A
55
dB
Vd
Dropout Voltage
Io = 0.5A
Io = 1.5A
200
500
400
900
mV
Isc
Zo
Short Circuit Current
Output Impedance
Vi = 14 V
f = 1KHz
2
2.7
A
40
m
Ω
5/13
L4940 series
Figure 4 :
Figure 5 :
Dropout Voltage vs. Temperature.
Dropout voltage vs. Output Current.
Figure 6 : Output voltage vs. Temperature
Figure 7 : OutputVoltage vs. Temperature
(L4940V5).
(L4940V85).
Figure 8 :
Figure 9 :
Output voltage vs. Temperature
(L4040V10).
OutputVoltage vs. Temperature
(L4940V12).
6/13
L4940 series
Figure 10 :
Figure 11 :
QuiescentCurrent vs. Temperature
(L4940V5).
QuiescentCurrent vs. Input Voltage
(L4940V5).
Figure 12 : QuiescentCurrent vs. Output Current
Figure 13 : Short-circuitCurrent vs. Temperature
(L4940V5).
(L4940V5).
Figure 14 : Peak Output Current vs.
Figure 15 : Low VoltageBehavior (L4940V5 ).
Input/OutputDifferential Voltage (L4940V5).
7/13
L4940 series
Figure 16 :
Figure 17 :
Low Voltage Behavior (L4940V10).
Low Voltage Behavior (L4940V85).
Figure 18 : Low Voltage Behavior (L4940V12).
Figure 19 : SupplyVoltage Rejection vs.
Frequency (L4940V5).
Figure 20 :
Figure 21 :
Supply Voltage Rejection vs.
output Current.
Load Dump Characteristics
(L4940V5 ).
8/13
L4940 series
Figure 22 :
Figure 23 :
Load Transient Response.
Line Transient Response (L4940V5).
Figure 24 : Total Power Dissipation.
Figure 25 :
Distributed Supply with On-card L4940 and L4941 Low-drop Regulators.
9/13
L4940 series
Figure 26 :
Distributed Supply with On-card L4940 and L4941 Low-drop Regulators.
ADVANTAGES OF THESE APPLICATIONS ARE :
On card regulation with short-circuit and thermal protection on each output.
Very high total system efficiency due to the switching preregulation and very low-drop postregulations.
Figure 27.
ADVANTAGES OF THIS CONFIGURATION ARE :
Very high regulation (line and load) on both the output voltages.
12 V output short-circuit and thermally protected.
Very high efficiency on the 12 V outputdue to the very low drop regulator.
10/13
L4940 series
TO-220 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
4.8
MIN.
MAX.
0.189
0.054
0.110
0.053
0.022
0.037
0.055
0.205
0.409
0.409
A
C
1.37
2.8
D
2.4
0.094
0.047
0.014
0.024
0.045
0.195
D1
E
1.2
1.35
0.55
0.94
1.4
0.35
0.61
1.15
4.95
F
F2
G
5.08
5.21
10.4
10.4
0.200
H2
H3
L2
L3
L5
L6
L7
Dia.
10.05
0.396
16.2
26.7
0.638
1.051
26.3
2.6
27.1
3
1.035
0.102
0.594
0.236
0.144
1.067
0.118
0.622
0.260
0.152
15.1
6
15.8
6.6
3.65
3.85
P011D
11/13
L4940 series
2
TO-263 (D PAK) MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
4.4
TYP.
MAX.
4.6
MIN.
0.173
0.098
0.027
0.044
0.017
0.048
0.352
0.393
0.192
0.590
0.050
0.055
MAX.
0.181
0.106
0.036
0.067
0.023
0.053
0.368
0.409
0.208
0.624
0.055
0.068
A
A1
B
2.49
0.7
2.69
0.93
1.7
B2
C
1.14
0.45
1.23
8.95
10
0.6
C2
D
1.36
9.35
10.4
5.28
15.85
1.4
E
G
4.88
15
L
L2
L3
1.27
1.4
1.75
D
A
C
C2
DETAIL”A”
DETAIL”A”
A1
B
B2
E
G
L3
L2
L
P011P6/F
12/13
L4940 series
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