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L4979MD

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
This is information on a product in full production.
September 2013 Doc ID 10262 Rev 9 1/22
1
L4979D
L4979MD
Low drop voltage regulator
Datasheet production data
Features
■ Operating DC supply voltage range 5.6 V to
31 V
■ Low quiescent current (6 µA typ. @ 25 °C with
enable low)
■ High precision output voltage (2%)
■ Low dropout voltage less than 0.5 V
■ Reset circuit sensing the output voltage down
to 1 V
■ Programmable reset pulse delay with external
capacitor
■ Watchdog
■ Programmable watchdog timer with external
capacitor
■ Thermal shutdown and short circuit protection
■ Automotive temperature range (T
j
=-40°C to
150 °C)
■ Enable input for enabling/disabling the voltage
regulator output
Description
L4979D and L4979MD are low dropout linear
regulators with microprocessor control functions
such as low voltage reset, watchdog, on/off
control. Typical quiescent current is 100 µA in
very low output current mode and enabled
regulator. The devices drop to 6 µA with not
enabled regulators.
On chip trimming results in high output voltage
accuracy (2%). Accuracy is kept over wide
temperature range, line and load variation.
The maximum input voltage is 40 V. The max
output current is internally limited. Internal
temperature protection disables the voltage
regulator output.
Table 1. Device summary
Package
Order codes
Tube Tape and reel
SO-8 L4979D L4979D013TR
SO-20 L4979MD L4979MD013TR
'!0'#&4
SO-8
SO-20
'!0'#&4
www.st.com
Contents L4979D, L4979MD
2/22 Doc ID 10262 Rev 9
Contents
1 Block diagram and pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Package and PCB thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 SO-8 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 SO-20 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 ECOPACK
® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3 SO-20 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
L4979D, L4979MD List of tables
Doc ID 10262 Rev 9 3/22
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 7. Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 8. Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 9. Enable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 10. Reset time diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 11. SO-8 thermal parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 12. SO-20 thermal parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 13. SO-8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 14. SO-20 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 15. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

L4979MD

Mfr. #:
Buy L4979MD
Manufacturer:
STMicroelectronics
Description:
LDO Voltage Regulators 5.0 Volt 0.5 Amp
Lifecycle:
New from this manufacturer.
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