L4940 (STMicroelectronics).pdf

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Very low drop 1.5 A regulator
L4940XX5, L4940XX85
L4940XX10, L4940XX12
Very low drop 1.5 A regulator
Features
■
Precise 5, 8.5, 10, 12 V outputs
■
Low dropout voltage (450 mV typ. at 1 A)
■
Very low quiescent current
■
Thermal shutdown
■
Short circuit protection
■
Reverse polarity protection
Description
TO-220
D 2 PA K
The L4940 series of three terminal positive
regulators is available in TO-220, TO-220FP and
D 2 PAK packages 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 batteries
powered equipment, reducing consumption and
prolonging battery life. Each type employs internal
current limiting, antisaturation circuit, thermal
shut-down and safe area protection.
Table 1.
Device summary
Order codes
Part numbers
Output voltages
TO-220
D 2 PA K
L4940XX5
L4940V5
L4940D2T5-TR
5 V
L4940XX85
L4940V85
8.5 V
L4940XX10
L4940D2T10-TR
10 V
L4940XX12
L4940D2T12-TR
12 V
July 2009
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Contents
L4940XX5, L4940XX85, L4940XX10, L4940XX12
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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L4940XX5, L4940XX85, L4940XX10, L4940XX12
Block diagram
1
Block diagram
Figure 1. Block diagram
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Pin configuration
L4940XX5, L4940XX85, L4940XX10, L4940XX12
2
Pin configuration
Figure 2. Pin connections (top view)
TO-220
TO-220FP
D 2 PAK
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L4940XX5, L4940XX85, L4940XX10, L4940XX12
Maximum ratings
3
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
V I
Forward input voltage
30
V
V O = 5V, R O = 100 Ω
-15
V
V IR
Reverse input voltage
V O = 8.5V, R O = 180 Ω
-15
V
V O = 10V, R O = 200 Ω
-15
V
V O = 12V, R O = 240 Ω
-15
V
I O
Output current
Internally Limited
mA
P D
Power dissipation
Internally Limited
mW
T stg
Storage temperature range
-40 to +150
°C
T op
Operating junction temperature range
-40 to +150
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3.
Thermal data
Symbol
Parameter
TO-220
TO-220FP
D 2 PA K
U n i t
R thJC
Thermal resistance junction-case
3
5
3
°C/W
R thJA
Thermal resistance junction-ambient
50
60
62.5
°C/W
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