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STMicroelectronics Electronic Components Datasheet

L4979MD13TR Datasheet

LOW DROP VOLTAGE REGULATOR

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L4979MD13TR pdf
L4979D
L4979MD
LOW DROP VOLTAGE REGULATOR
1 FEATURES
OPERATING DC SUPPLY VOLTAGE RANGE
5.6V TO 31V
LOW QUIESCENT CURRENT
(6µA Typ. @ 25°C with Enable Low)
HIGH PRECISION OUTPUT VOLTAGE (2%)
LOW DROPOUT VOLTAGE LESS THAN 0.5V
RESET CIRCUIT SENSING THE OUTPUT
VOLTAGE DOWN TO 1V
PROGRAMMABLE RESET PULSE DELAY
WITH EXTERNAL CAPACITOR
WATCHDOG
PROGRAMMABLE WATCHDOG TIMER WITH
EXTERNAL CAPACITOR
THERMAL SHUTDOWN AND SHORT
CIRCUIT PROTECTION
AUTOMOTIVE TEMPERATURE RANGE
(Tj = -40°C TO 150°C)
ENABLE INPUT FOR ENABLING/DISABLING
THE VOLTAGE REGULATOR OUTPUT
Figure 2. Block Diagram
Figure 1. Packages
SO-8
Table 1. Order Codes
Part Number
L4979D
L4979MD
L4979D13TR
L4979MD13TR
SO-20
Package
SO-8
SO-20
SO-8 Tape & Reel
SO-20 Tape & Reel
Vi Vs
5V, 150 mA
Vo
Co
Vcw
Ctw
Wi
watchdog
Voltage reference
Vcr
Ctr
reset
gnd
En
Res
October 2004
Rev. 5
1/10


STMicroelectronics Electronic Components Datasheet

L4979MD13TR Datasheet

LOW DROP VOLTAGE REGULATOR

No Preview Available !

L4979MD13TR pdf
L4979MD L4979D
Table 2. Pin Function
SO8
1
SO20
1
Pin
Name
En
2 4 gnd
5,6,15,16
gnd
3 7 Res
4 10 Vcr
5 11 Vcw
6 14 Wi
7 17 Vo
8 20 Vs
2, 3, 8, 9, 12, N. C.
13, 18, 19
Function
Enable input
If high, regulator, watchdog and reset are operating. If low, regulator, watchdog
and reset are shut down.
Ground reference
Ground
These pins are to be connected to a heat spreader electrically grounded
Reset output.
It is pulled down when output voltage drops below Vo_th or frequency at Wi is too
low.
Reset timing adjust
A capacitor between Vcr pin and gnd sets the reset delay time (trd)
Watchdog timer adjust
A capacitor between Vcw pin and gnd sets the time response of the watchdog
monitor.
Watchdog input.
If the frequency at this input pin is too low, the Reset output is activated.
Voltage regulator output
Output capacitor >100nF is needed for regulator stability
Supply voltage
Supply capacitor (e.g. 200nF) is needed for regulator stability.
not connected
Figure 3. Pins Connection (Top view)
EN
GND
RES
VCR
18
27
3 SO8 6
45
SO8
VS
VO
WI
VCW
EN
N.C.
N.C.
GND
GND
GND
RES
N.C.
N.C.
VCR
1 20
2 19
3 18
4 17
5 16
6 SO20 15
7 14
8 13
9 12
10 11
D00AT457
VS
N.C.
N.C.
VO
GND
GND
WI
N.C.
N.C.
WCW
2/10


Part Number L4979MD13TR
Description LOW DROP VOLTAGE REGULATOR
Maker STMicroelectronics
Total Page 10 Pages
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