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PDF L4949D Data sheet ( Hoja de datos )
| Número de pieza | L4949D | |
| Descripción | MULTIFUNCTION VERY LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | Motorola Inc | |
| Logotipo |  |
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Advanced Information
Multifunction Very Low
Dropout Voltage Regulator
The L4949 is a monolithic integrated 5.0 V voltage regulator with a very
low dropout and additional functions such as power–on reset and input
voltage sense.
It is designed for supplying the micro–computer controlled systems
especially in automotive applications.
• Operating DC Supply Voltage Range 5.0 V to 28 V
• Transient Supply Voltage Up to 40 V
• Extremely Low Quiescent Current in Standby Mode
• High Precision Standby Output Voltage 5.0 V ±1%
• Output Current Capability Up to 100 mA
• Very Low Dropout Voltage Less Than 0.4 V
• Reset Circuit Sensing The Output Voltage
• Programmable Reset Pulse Delay With External Capacitor
• Voltage Sense Comparator
• Thermal Shutdown and Short Circuit Protections
Order this document from L4949/D
L4949
MULTIFUNCTION
VERY LOW DROPOUT
VOLTAGE REGULATOR
SILICON MONOLITHIC
INTEGRATED CIRCUIT
8
1
N SUFFIX
PLASTIC PACKAGE
CASE 626
Supply
Voltage (VCC)
1
Representative Block Diagram
Output
Voltage (Vout)
VZ 3
8 CT 4
Preregulator
6.0 V
2.0 µA
Sense
Input
(Si)
2
Regulator
Vs
1.23 Vref
Reset
+
– 2.0 V
+
–
Sense
1.23 V
5 Gnd
This document contains information on a new product. Specifications
and information herein are subject to change without notice.
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
PIN CONNECTIONS
Reset
6
Sense
Output
(So)
7
VCC 1
Si 2
VZ 3
CT 4
8 Vout
7 So
6 Reset
5 Gnd
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
L4949N
L4949D
TJ = –40° to +125°C
DIP–8
SO–8
© Motorola, Inc. 1997
Rev 0
1 page  
L4949
TYPICAL CHARACTERIZATION CURVES (continued)
Figure 9. Sense Output versus
Sense Input Voltage
6.0
5.0 TJ = 25°C
4.0 Resistor 10 k
from Sense Output
3.0 to 5.0 V
2.0
1.0
0
1.0 1.05 1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5
VSI, SENSE INPUT VOLTAGE (V)
1.4
1.38
1.36
1.34
1.32
1.3
1.28
1.26
1.24
1.22
1.2
–40
Figure 10. Sense Thresholds versus
Junction Temperature
Upper Threshold
Lower Threshold
–20 0 20 40 60 80 100
TJ, JUNCTION TEMPERATURE (°C)
120
APPLICATION INFORMATION
Supply Voltage Transient
High supply voltage transients can cause a reset output
signal perturbation. For supply voltages greater than 8.0 V
the circuit shows a high immunity of the reset output against
supply transients of more than 100 V/µs. For supply voltages
less than 8.0 V supply transients of more than 0.4 V/µs can
cause a reset signal perturbation. To improve the transient
behavior for supply voltages less than 8.0 V a capacitor at Pin
3 can be used. A capacitor at Pin 3 (C3 ≤ 1.0 µF) reduces
also the output noise.
Figure 11. Application Schematic
C3 Vout CO
VZ
(optional)
3 8 CT 4
Vbat VCC Preregulator
1 6.0 V
Cs
2.0 µA
Regulator
VCC
Si
2
1.23 Vref
NOTES: 1. For stability: Cs ≥ 1.0 µF, CO ≥ 4.7 µF, ESR < 10 Ω at 10 kHz
2. Recommended for application: Cs = CO = 10 µF
Reset
+
– 2.0 V
Sense
+
– 1.23 V
5 Gnd
Reset
6
10 kΩ
Vout
RSO 10 kΩ
So
7
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L4949D.PDF ] | |
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