L4940
1.5 A very low drop voltage regulator IC
Datasheet
-
production data
Table 1. Device summary
Order code
TO-220
L4940V5
L4940V85
TO-220
D²PAK
L4940D2T12-TR
D²PAK
L4940D2T5-TR
Output
voltages
5V
8.5 V
12 V
Features
•
Precise 5, 8.5, 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
The L4940 series of three-terminal positive
regulators is available in TO-220 and D²PAK
packages and with several fixed output voltages,
making it useful in a wide range of industrial and
consumer applications. Thanks to their very low
input/output voltage drop, these devices are
particularly suitable for battery-powered
equipment, reducing consumption and prolonging
battery-life. Each type employs internal current
limiting, anti-saturation circuit, thermal shutdown
and safe area protection.
April 2015
This is information on a product in full production.
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Contents
L4940
Contents
1
2
3
4
5
6
7
8
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Test circuits
............................................... 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.1
8.2
8.3
8.4
TO-220 (dual gauge) package information . . . . . . . . . . . . . . . . . . . . . . . . 16
TO-220 (dual gauge) packing information . . . . . . . . . . . . . . . . . . . . . . . . 18
D²PAK package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
D²PAK packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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L4940
Block diagram
1
Block diagram
Figure 1. Block diagram
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Pin configuration
L4940
2
Pin configuration
Figure 2. Pin connections (top view)
TO-220
D²PAK
4/25
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L4940
Maximum ratings
3
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
V
I
Forward input voltage
Parameter
Value
30
V
O
= 5 V, R
O
= 100
Ω
-15
-15
-15
Internally limited
Internally limited
-40 to +150
-40 to +150
Unit
V
V
V
V
mA
mW
°C
°C
V
IR
Reverse input voltage
V
O
= 8.5 V, R
O
= 180
Ω
V
O
= 12 V, R
O
= 240
Ω
I
O
P
D
T
stg
T
op
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 3. Thermal data
Symbol
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
TO-220
3
50
D²PAK
3
62.5
Unit
°C/W
°C/W
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