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PDF L4949ED-E Data sheet ( Hoja de datos )

Número de pieza L4949ED-E
Descripción (L4949ED-E / L4949EP-E) Multifunction very low drop voltage regulator
Fabricantes STMicroelectronics 
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L4949ED-E
L4949EP-E
Multifunction very low drop
voltage regulator
Features
ECOPACK®: lead free and RoHS compliant
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
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 power-
on reset and input voltage sense. They are
designed for supplying the microcomputer
controlled systems especially in automotive
applications.
Table 1. Device summary
Package
SO-8
SO-20W
November 2009
Tube
L4949ED-E
L4949EP-E
Order codes
Tape and reel
L4949EDTR-E
L4949EPTR-E
Doc ID 16823 Rev 1
1/19
www.st.com
1
Free Datasheet http://www.datasheet4u.com/

1 page




L4949ED-E pdf
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
Doc ID 16823 Rev 1
SO-20
5/19
Free Datasheet http://www.datasheet4u.com/

5 Page





L4949ED-E arduino
L4949ED-E, L4949EP-E
Application information
present functions are required. The modular approach of this device allows to get easily also
other features and functions when required.
3.3 Voltage regulator
The voltage regulator uses an Isolated Collector Vertical PNP transistor as a regulating
element.
Figure 4. Foldback characteristic of VO
With this structure very low dropout voltage at currents up to 100mA is obtained. The
dropout operation of the standby regulator is maintained down to 3V input supply voltage.
The output voltage is regulated up to the transient input supply voltage of 40V. With this
feature no functional interruption due to overvoltage pulses is generated. The typical curve
showing the standby output voltage as a function of the input supply voltage is shown in
Figure 5. The current consumption of the device (quiescent current) is less than 300 µA.
To reduce the quiescent current peak in the undervoltage region and to improve the
transient response in this region, the dropout voltage is controlled, the quiescent current as
a function of the supply input voltage is shown in Figure 6.
Doc ID 16823 Rev 1
11/19
Free Datasheet http://www.datasheet4u.com/

11 Page







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