|
|
PDF L4987 Data sheet ( Hoja de datos )
| Número de pieza | L4987 | |
| Descripción | VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de L4987 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
|
No Preview Available !
L4987
® SERIES
VERY LOW DROP VOLTAGE REGULATORS
WITH INHIBIT AND DROPOUT CONTROL FLAG
s VERY LOW DROPOUT VOLTAGE (0.25V
TYP.)
s DROPOUT CONTROL FLAG
s VERY LOW QUIESCENT CURRENT
(TYP. 90 µA IN OFF MODE, 500µA IN ON
MODE)
s OUTPUT CURRENT UP TO 200 mA
s LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
s OUTPUT VOLTAGES OF 3V, 5V 8.7V 12V
s INTERNAL CURRENT AND THERMAL LIMIT
s ONLY 2.2µF FOR STABILITY
s AVAILABLEIN ± 2% SELECTION AT 25 oC
s SUPPLY VOLTAGE REJECTION: 70 dB (TYP.)
PPAK
DESCRIPTION
The L4987 is a very low drop regulator available
in PPAK. The very low drop-voltage (0.5V Max at
200 mA) and the very low quiescent current make
it particularly suitable for low noise, low power
applications, and in battey powered systems. The
input dump protection up to 40V makes it ideal for
automotive applications. a shutdown Logic
Control function is available (pin2, TTL
compatible). This means that when the device is
used as a local regulator, it is possible to put a
part of the boad in standby, decreasing the total
power consumption. The regulator employs an
output pin (open collector) providing a logic signal
when the pass transistor is in saturation at low
input voltage, this signal can be used to prevent
the pop-up phenomenon in the car radio. In
battery powered systems (the cellular phone,
notebook) it is possible to use the flag to monitor
the battery charge status through the dropout of
the regulator.
SCHEMATIC DIAGRAM
October 1998
1/11
1 page  
L4987 SERIES
ELECTRICAL CHARACTERISTICS FOR L4987CPT87 (refer to the test circuits, VI = 11.7V,
IOUT = 5mA, Tj = 25 oC, Ci = 0.1 µF, Co = 2.2 µF unless otherwise specified)
Symbol
Parameter
Test Conditions
Min. Typ. Max.
Vo Output Voltage
Io = 200 mA, Vi =11.7 V
8.526 8.7 8.874
Io = 200 mA, Vi =11.7 V -40<TJ<125oC 8.35
9.05
Vi Operating Input Voltage
Io = 200 mA
9.55
18
Io ut Output Current Limit
250
∆Vo Line Regulation
Vi = 10 to 18 V, Io = 0.5 mA
4 24
∆Vo Load Regulation
Vi = 10 V
Io = 0.5 to 200 mA
3 20
Id Quiescent Current
ON MODE
Vi = 10 to 18 V Io = 0 mA
Vi = 10 to 18 V Io = 200 mA
0.5 1
36
OFF MODE Vi = 12 V
90 180
SVR Supply Voltage Rejection
Io = 5 mA Vi = 11 V ± 1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
71
68
55
Vd Dropout Voltage
Vil Control Input Logic Low
Vih Control Input Logic High
Io = 200 mA
Io = 200 mA -40 < TJ < 125 oC
-40 < TJ < 125 oC
-40 < TJ < 125 oC
0.3 0.5
0.7
0.8
2
Ii Control Input Current
10
CO Output Bypass Capacitance ESR = 0.5 to 10 Ω Io = 0 to 200 mA 2 10
-40 < TJ < 125 oC
Vfl Control Flag Output Low
Vi - Vo < Vcesat power, Ifl = 6 mA
Io = 200 mA
0.5
Ifh Control Flag Output High
Leakage Current
Vi > 9.55 V Voh = 15 V
10
Unit
V
V
V
A
mV
mV
mA
mA
µA
dB
dB
dB
V
V
V
V
µA
µF
V
µA
5/11
5 Page 
L4987 SERIES
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
http://www.st.com
.
11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet L4987.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| L4981 | POWER FACTOR CORRECTOR | STMicroelectronics |
| L4981A | POWER FACTOR CORRECTOR | STMicroelectronics |
| L4981B | POWER FACTOR CORRECTOR | STMicroelectronics |
| L4981X | POWER FACTOR CORRECTOR | STMicroelectronics |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |