L4805CV [STMICROELECTRONICS]
VERY LOWDROP VOLTAGE REGULATORS; 非常LOWDROP稳压器型号: | L4805CV |
厂家: | ST |
描述: | VERY LOWDROP VOLTAGE REGULATORS |
文件: | 总7页 (文件大小:140K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
L4805-L4885-L4892
L4808-L4810-L4812
VERY LOW DROP VOLTAGE REGULATORS
.
.
.
.
.
.
.
INPUT/OUTPUT DROP TYP. 0.4V
400mA OUTPUT CURRENT
LOW QUIESCENT CURRENT
REVERSE POLARITY PROTECTION
OVERVOLTAGEPROTECTION (± 60V)
FOLDBACK CURRENT LIMITING
THERMAL SHUTDOWN
DESCRIPTION
L4800 series devices are voltage regulators with a
verylow voltage drop (typically 0.4V at fullrated cur-
rent), output current up to 400mA, low quiescent
currentandcomprehensiveon-chipprotection.The-
se devices are protected against load dump and
field decaytransients of ± 60V, polarity reversaland
overheating. A foldback current limiter protects
against load short circuits. Available in 5V, 8.5V,
9.2V,10V and12Vversions(all± 4%,TI =25°C)the-
se regulatorsaredesignedforautomotive, industrial
and consumer applications where low consumption
is particularly important.
SOT-82
TO-220
In automotiveapplications the L4805 is ideal for 5V
logicsuppliesbecauseitcan operateevenwhen the
batteryvoltagefallsbelow 6V. In batterybackupand
standbyapplications the low consumption of these
devices extends battery life.
BLOCK DIAGRAM
March 1992
1/7
L4805-L4808-L4885-L4892-L4810-L4812
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
+ 35
- 18
60
Unit
V
VI
DC Input Voltage
DC Input Reverse Voltage
V
Transient Input Overvoltages :
Load Dump :
V
5ms < Trise < 10ms,
τf Fall Time Constant = 100ms,
Rsource < 0.5Ω
Field Decay :
- 60
V
5ms < tfall < 10ms, Rsource < 10Ω
τr Rise Time Constant = 33ms
Junction and Storage Temperature Range
Tj, Tstg
- 55 to + 150
°C
THERMAL DATA
Symbol
Parameter
SOT82
TO220
Unit
Rth j-case
Rth j-amb
Thermal Resistance Junction-case
Max.
Max.
8
4
°C/W
°C/W
Thermal Resistance Junction-ambient
100
75
PIN CONNECTION (top view)
Order Codes
Output Voltage
TO-220
SOT-82
L4805CV
L4808CV
L4885CV
L4892CV
L4810CV
L4812CV
L4805CX
L4808CX
L4885CX
L4892CX
L4810CX
L4812CX
5V
8V
8.5 V
9.2 V
10 V
12 V
TEST AND APPLICATION CIRCUIT
Theoutput capacitorisrequired forstability. Though
the 100 µF shown is the minimum recommended
value, actual size and type may vary depending
upon the application load and temperature range.
Capacitoreffectiveseriesresistance (ESR)alsofac-
tors in the IC stability. Since ESR varies from one
brandtothe next,some bench workmay be required
to determine the minimum capacitor value to use in
production. Worst-case is usuallydetermined at the
minimum ambient temperature and maximum load
expected.
Capacitorsmust also berated at all ambient tempe-
ratureexpectedin the system. Many aluminum type
electrolyticswill freeze at temperatures less than –
30 °C, reducing their effective capacitance to zero.
To maintain regulatorstability down to – 40 °C, ca-
pacitors rated at that temperature (such as tan-
talums) must be used.
Output capacitors can be increased in size to any
desired value above the minimum. One possible
purpose of this would be to maintain the output vol-
tages during brief conditions of negative input tran-
sients that might be characteristics of a particular
system.
2/7
L4805-L4808-L4885-L4892-L4810-L4812
ELECTRICAL CHARACTERISTICS (VI = 14.4V; CO = 100µF; Tj = 25°C unless otherwise specified.)
Symbol
Parameter
Output Voltage
Test Condition
IO = 5mA to 400mA (L4805)
IO = 5mA to 400mA (L4808)
IO = 5mA to 400mA (L4810)
IO = 5mA to 400mA (L4812)
IO = 5mA to 400mA (L4885)
IO = 300mA (L4892)
Min.
4.80
7.68
8.16
8.83
9.60
11.50
Typ.
5.00
Max.
5.20
8.32
8.84
9.57
10.40
12.50
26
Unit
V
VO
8.00
V
8.50
V
9.20
V
10.00
12.00
V
V
VI
Operating Input Voltage
Line Regulation
V
∆VO/VO
∆VO/VO
VI - VO
VI = 13 to 26V; IO = 5mA
IO = 5 to 400mA*
IO = 400mA*
1
10
mV/V
mV/V
V
Load Regulation
Dropout Voltage
3
15
0.4
0.2
0.8
25
65
0.1
0.7
IO = 150mA
0.4
V
Iq
Quiescent Current
IO = 0mA
2
mA
mA
mA
IO = 150mA
45
IO = 400mA*
90
∆VO
Temperature Output Voltage
Drift
mV
°C•V
∆T•VO
Supply Voltage Rejection
IO = 350mA; f = 320Hz;
CO = 100µF; VI = VO +3V+2Vpp
60
dB
SVR
IO
Max Output Current
800
350
mA
mA
ISC
Output Short Circuit Current
(fold back condition)
500
* only for L4892 the current test conditions is IO = 300mA
ELECTRICAL CHARACTERISTICS (VI = 14.4V; CO = 100µF; Tj = -40 to 125°C (note 1) unless
otherwise specified.)
Symbol
Parameter
Output Voltage
Test Condition
IO = 5mA to 400mA (L4805)
IO = 5mA to 400mA (L4808)
IO = 5mA to 400mA (L4810)
IO = 5mA to 400mA (L4812)
IO = 5mA to 400mA (L4885)
IO = 300mA (L4892)
see note 2
Min.
4.70
7.50
8.00
8.65
9.40
11.30
Typ.
5.00
Max.
5.30
8.50
9.00
9.75
10.60
12.70
26
Unit
V
VO
8.00
V
8.50
V
9.20
V
10.00
12.00
V
V
VI
Operating Input Voltage
Line Regulation
V
∆VO/VO
∆VO/VO
VI - VO
VI = 14 to 26V; IO = 5mA
IO = 5 to 400mA*
2
5
15
mV/V
mV/V
V
Load Regulation
Dropout Voltage
25
IO = 400mA*
0.5
0.25
1.2
40
0.9
IO = 150mA
0.5
V
Iq
Quiescent Current
IO = 0mA
3
mA
mA
mA
mA
mA
IO = 150mA
70
IO = 400mA*
80
140
IO
Max Output Current
870
230
ISC
Output Short Circuit Current
(fold back condition)
Notes : 1. This limits are guaranteed by design, correlation and statistical control on production samples over the indicated temperature and
supply voltage ranges..
2. For a DC voltage 26V < Vi < 35V the device is not operating.
3/7
L4805-L4808-L4885-L4892-L4810-L4812
Figure 1: Dropout Voltage vs. Output Current
Figure 2: Quiescent Current vs. Output Current
Figure 4: Foldback Current Limiting(L4805)
Figure 3: Output Voltage vs. Temperature
Figure 5: Preregulator for Distributed Supplies
4/7
L4805-L4808-L4885-L4892-L4810-L4812
SOT82 PACKAGE MECHANICAL DATA
mm
inch
DIM.
MIN.
7.4
TYP.
MAX.
7.8
MIN.
0.291
0.413
0.028
0.019
0.094
TYP.
MAX.
0.307
0.425
0.035
0.030
0.106
A
B
10.5
0.7
10.8
0.9
b
b1
C
c1
D
e
0.49
2.4
0.75
2.7
1.2
15.7
2.2
0.047
0.618
0.087
0.173
0.150
e3
F
4.4
3.8
H
2.54
0.100
5/7
L4805-L4808-L4885-L4892-L4810-L4812
TO220 PACKAGE MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
4.8
MIN.
MAX.
0.189
0.054
0.110
0.053
0.022
0.041
0.055
0.205
0.409
0.409
A
C
1.37
2.8
D
2.4
1.2
0.094
0.047
0.014
0.031
0.045
0.195
D1
E
1.35
0.55
1.05
1.4
0.35
0.8
F
F2
G
1.15
4.95
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
6/7
L4805-L4808-L4885-L4892-L4810-L4812
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica-
tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre-
viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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