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PDF L2949E Data sheet ( Hoja de datos )
| Número de pieza | L2949E | |
| Descripción | MULTIFUNCTION VERY LOW DROP VOLTAGE REGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L2949E (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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UTCL2949E LINEAR INTEGRATED CIRCUIT
MULTIFUNCTION VERY LOW
DROP VOLTAGE REGULATOR
DESCRIPTION
The UTC L2949E is a monolithic integrated 5V voltage
regulator with a very low dropout output and additonal
functions as power-on reset and input voltage sense.It is
designed for supplying the microcomputer controlled
systems especially in automotive applications.
FEATURES
*Operating dc supply voltage range 5V to 28V.
*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.
PIN CONNECTIONS
DIP-8
SOP-8
SOP-20
VS 1
SI 2
Vz 3
CT 4
8 VOUT
7 SO
6 RES
5 GND
DIP-8/SOP-8
Vz
CT
N.C.
GND
GND
GND
GND
N.C.
N.C.
RES
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
SOP-20
SI
VS
N.C.
GND
GND
GND
GND
N.C.
VOUT
SO
UTC UNISONIC TECHNOLOGIES CO. LTD
1
QW-R102-014,A
1 page  
UTCL2949E LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION
The UTC L2949E is a monolithic integrated voltage regulator,based on the STM modular voltage regulator
approch.Several outstanding features and auxiliary functions are implemented to meet the requirements of supplying
microprocessor systems in automotive applications.Nevertheless,It is suitable also in other applications where the
present functions are required.The modular approach of this device allows to get easily also other features and
functions when required.
Voltage Regulator
The voltage regulator uses an lsolated Collector Vertical PNP transistor as a regulating element.
10
5
0
20 100
200
IOUT(mA)
Figure 1: 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 4V.With this feature no functional interruption due to overvoltage pulses is generated.The
typical cuve showing the standby.output voltage as a function of the input supply voltage is shown in Fig.2. The
current consumption of the device(quiescent current) is less than 300μA.
To reduce the quiescent current peak in the undervoltage region and to improve the transient response inthis
region.the dropout voltage is controlled,the quiescent current as a function of the supply input voltage is shown in
Fig.3.
UTC UNISONIC TECHNOLOGIES CO. LTD
5
QW-R102-014,A
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet L2949E.PDF ] | |
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