ST L4949ED-E, L4949EP-E User Manual
Features
■ ECOPACK
■ Automotive Grade: compliance with AEC
guidelines
■ Operating DC supply voltage range 5 V - 28 V
■ Transient supply voltage up to 40V
■ Extremely low quiescent current in standby
mode
■ High precision standby output voltage 5V±1%
■ Output current capability up to 100mA
■ Very low dropout voltage less than 0.5V
■ Reset circuit sensing the output voltage
■ Programmable reset pulse delay with external
capacitor
■ Voltage sense comparator
■ Thermal shutdown and short circuit protections
®
: lead free and RoHS compliant
L4949ED-E
L4949EP-E
Multifunction very low drop
voltage regulator
SO-8
SO-20W (12+4+4)
Description
The L4949ED-E and L4949EP-E are monolithic
integrated 5V voltage regulators with a very low
dropout output and additional functions as poweron reset and input voltage sense. They are
designed for supplying the microcomputer
controlled systems especially in automotive
applications.
Table 1. Device summary
Package
Tube Tape and reel
SO-8 L4949ED-E L4949EDTR-E
SO-20W L4949EP-E L4949EPTR-E
November 2009 Doc ID 16823 Rev 1 1/19
Order codes
www.st.com
1
Contents L4949ED-E, L4949EP-E
Contents
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Supply voltage transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Preregulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 Reset circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.6 Sense comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 ECOPACK® packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 SO-8 TP package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 SO-20 TP package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/19 Doc ID 16823 Rev 1
L4949ED-E, L4949EP-E List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 7. Sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 8. Preregulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 9. SO-8 TP mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 10. SO-20 TP mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 11. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Doc ID 16823 Rev 1 3/19
List of figures L4949ED-E, L4949EP-E
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Configuration diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Application circuit
Figure 4. Foldback characteristic of V
Figure 5. Output voltage vs input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6. Quiescent current vs supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 7. Block circuit of reset circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 8. Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 9. SO-8 TP package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 10. SO20 TP package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
(1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
O
4/19 Doc ID 16823 Rev 1
L4949ED-E, L4949EP-E Block diagram and pin description
1 Block diagram and pin description
Figure 1. Block diagram
Note: The block diagram illustrates only a major internal device functionality and it is not intended
to mimic any details of hardware design
Figure 2. Configuration diagram (top view)
SO-8
SO-20
Doc ID 16823 Rev 1 5/19
Block diagram and pin description L4949ED-E, L4949EP-E
Table 2. Pin definitions and functions
Pin N°
Symbol Function
SO-8 SO-20
119 V
220 S
31 V
42 C
4, 5, 6, 7, 14,
5
15, 16, 17
S
I
Z
T
GND Ground reference
610 RES
Input supply voltage. Block to GND via an external
capacitor (see Figure 3).
Sense input pin to supervise input voltage. Connect via an
external voltage divider connected to V
Preregulator output voltage. For details, see Section 3.4:
Preregulator.
Reset pulse delay adjustment. Connecting this pin via a
capacitor to GND
Reset output. It is pulled down when the output voltage
goes below V
RT
.
Sense output. This open collector pin must be connected to
V
711 S
812 V
O
OUT
via an external resistor. It is pulled down whenever
OUT
voltage becomes lower than an internal voltage.
the S
I
Output voltage. Block to GND via an external capacitor (see
Figure 3)
- 3, 8, 9, 13, 18 NC Not connected pins
and to GND.
S
6/19 Doc ID 16823 Rev 1
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