L4949 Motorola, L4949 Datasheet

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L4949

Manufacturer Part Number
L4949
Description
Manufacturer
Motorola
Datasheet

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Advanced Information
Multifunction Very Low
Dropout Voltage Regulator
low dropout and additional functions such as power–on reset and input
voltage sense.
especially in automotive applications.
This document contains information on a new product. Specifications
and information herein are subject to change without notice.
Voltage (V CC )
The L4949 is a monolithic integrated 5.0 V voltage regulator with a very
It is designed for supplying the micro–computer controlled systems
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
Supply
Sense
Input
(S i )
1
2
V s
Regulator
Preregulator
1.23 V ref
Representative Block Diagram
6.0 V
V Z
3
Voltage (V out )
5
Output
Reset
Gnd
8
2.0 A
Sense
C T
4
+
+
1.23 V
2.0 V
Sense
Output
(S o )
Reset
7
6
L4949N
L4949D
Motorola, Inc. 1997
Device
VOLTAGE REGULATOR
V
VERY LOW DROPOUT
C T
V Z
CC
S
ORDERING INFORMATION
i
MULTIFUNCTION
INTEGRATED CIRCUIT
SILICON MONOLITHIC
1
2
3
4
PIN CONNECTIONS
Temperature Range
T J = –40 to +125 C
PLASTIC PACKAGE
PLASTIC PACKAGE
Order this document from L4949/D
L4949
8
Operating
8
N SUFFIX
CASE 626
D SUFFIX
CASE 751
(Top View)
1
1
8
7
6
5
Package
V out
S o
Reset
Gnd
DIP–8
SO–8
Rev 0

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L4949 Summary of contents

Page 1

... 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 designed for supplying the micro–computer controlled systems especially in automotive applications. ...

Page 2

... out = 35 mA) Line Regulation (6.0 V < < out = 1.0 mA) Load Regulation (1.0 mA < I out < 100 mA) Current Limit V out = 4 out = 0 V Quiescent Current (I out = 0.3 mA < 100 C) Quiescent Current (I out = 100 mA) 2 L4949 Symbol Value Unit ...

Page 3

... Figure 1. Output Voltage versus Junction Temperature 5. out = 1.0 mA 5.02 5.0 4.98 4.96 –40 – JUNCTION TEMPERATURE ( C) MOTOROLA ANALOG IC DEVICE DATA L4949 Symbol V Resth V Resth,hys t ResD t ResR 3 ResL I ResH V CTth V CTth, hys V SOth V SOth,hys V SOL I SOH PIN FUNCTION DESCRIPTION Description Figure 2 ...

Page 4

... I out , OUTPUT CURRENT (mA) Figure 7. Reset Output versus Regulator Output Voltage 6 5.0 Resistor 10 k from Reset Output 4.0 to 5.0 V 3.0 2.0 1.0 0 4.0 4.1 4.2 4.3 4.4 4.5 4.6 V out , OUTPUT VOLTAGE (V) 4 L4949 (continued) Figure 4. Dropout Voltage versus 0.40 0.30 0.20 0.10 0 100 –40 –20 Figure 6. Quiescent Current versus 3 2.5 2.0 1.5 1.0 0.5 0 100 0 5.0 Figure 8. Reset Thresholds versus 4 ...

Page 5

... V/ s. For supply voltages V bat Regulator NOTES: 1. For stability 1 4.7 F, ESR < Recommended for application MOTOROLA ANALOG IC DEVICE DATA L4949 Figure 10. Sense Thresholds versus 1.4 1.38 1.36 Upper Threshold 1.34 1.32 1.3 1.28 1.26 Lower Threshold 1.24 1.22 1.2 1 ...

Page 6

... The L4949 is a monolithic integrated low dropout voltage regulator. Several outstanding features and auxiliary functions are implemented to meet the requirements of supplying microprocessor systems in automotive applications. Nevertheless suitable also in other applications where the present functions are required. The modular approach of this device allows the use of other features and functions independently when required ...

Page 7

... V – Reg MOTOROLA ANALOG IC DEVICE DATA L4949 Standby output voltage drops below the reset threshold only a bit longer than the reaction time results in a shorter reset delay time. The nominal reset delay time will be generated for standby output voltage drops longer than approximately 50 s. The typical reset output waveforms are shown in Figure 16 ...

Page 8

... MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE MOLD PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. MILLIMETERS DIM MIN MAX A 1.35 1.75 A1 0.10 0.25 B 0.35 0.49 C 0.18 0.25 D 4.80 5.00 E 3.80 4.00 e 1.27 BSC H 5.80 6.20 h 0.25 0.50 L 0.40 1. Mfax is a trademark of Motorola, Inc. L4949/D MOTOROLA ANALOG IC DEVICE DATA ...

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