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PDF MC78LC50NTR Data sheet ( Hoja de datos )
| Número de pieza | MC78LC50NTR | |
| Descripción | MICROPOWER ULTRA-LOW QUIESCENT CURRENT VOLTAGE REGULATORS | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Advance Information
Micropower Voltage Regulator
The MC78LC00 series voltage regulators are specifically designed for
use as a power source for video instruments, handheld communication
equipment, and battery powered equipment.
The MC78LC00 series features an ultra–low quiescent current of 1.1 µA
and a high accuracy output voltage. Each device contains a voltage
reference, an error amplifier, a driver transistor and resistors for setting the
output voltage. These devices are available in either SOT–89, 3 pin, or
SOT–23, 5 pin, surface mount packages.
MC78LC00 Series Features:
• Low Quiescent Current of 1.1 µA Typical
• Low Dropout Voltage (220 mV at 10 mA)
• Excellent Line Regulation (0.1%)
• High Accuracy Output Voltage (±2.5%)
• Wide Output Voltage Range (2.0 V to 6.0 V)
• Output Current for Low Power (up to 80 mA)
• Two Surface Mount Packages (SOT–89, 3 Pin, or SOT–23, 5 Pin)
ORDERING INFORMATION
Device
Output
Voltage
Operating
Temperature Range
Package
MC78LC30HT1
MC78LC33HT1
MC78LC40HT1
MC78LC50HT1
MC78LC30NTR
MC78LC33NTR
MC78LC40NTR
MC78LC50NTR
3.0
3.3
4.0 SOT–89
5.0
3.0 TA = –30° to +80°C
3.3
4.0 SOT–23
5.0
Other voltages from 2.0 to 6.0 V, in 0.1 V increments, are available upon request. Consult
factory for information.
Representative Block Diagram
2
Vin
3
VO
Order this document by MC78LC00/D
MC78LC00
Series
MICROPOWER ULTRA–LOW
QUIESCENT CURRENT
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
TAB
1
H SUFFIX
PLASTIC PACKAGE
CASE 1213
(SOT–89)
Ground 1
Input 2
Output 3
(Top View)
Tab
(Tab is connected
to Pin 2)
5
1
N SUFFIX
PLASTIC PACKAGE
CASE 1212
(SOT–23)
Ground 1
Input 2
Output 3
5 N/C
4 N/C
(Top View)
Vref
1
Gnd
This device contains 8 active transistors.
This document contains information on a new product. Specifications and information herein
arMe OsuTbjOecRt tOo cLhAangAeNwAithLoOut GnotIiCce.DEVICE DATA
Standard Application
Input 2
3
MC78LCXX
Cin 1
Output
CO
© Motorola, Inc. 1997
Rev 1
1
1 page  
MC78LC00 Series
APPLICATIONS INFORMATION
Introduction
The MC78LC00 micropower voltage regulators are
specifically designed with high accuracy output voltage and
ultra low quiescent current by CMOS process making them
ideal for battery powered applications and hand–held
communication equipment. An input bypass capacitor is
recommended if the regulator is located an appreciable
distance (≥ 4 inches) from the input voltage source. These
regulators require ≥ 0.1 µF capacitance between the output
terminal and ground for stability. Most types of aluminum,
tantalum or multilayer ceramic will perform adequately. Solid
tantalums or other appropriate capacitors are recommended
for operation below 25°C. The bypass capacitors should be
mounted with the shortest possible leads or track lengths
directly across the regulator input and output terminals.
With economical electrolytic capacitors, cold temperature
operation can pose a serious stability problem. As the
electrolyte freezes, around –30°C, the capacitance will
decrease and the equivalent series resistance (ESR) will
increase drastically, causing the circuit to oscillate. Quality
electrolytic capacitors with extended temperature ranges of
–40° to +85°C are readily available. Solid tantalum
capacitors may be the better choice if small size is a
requirement. However, a maximum ESR limit of 3.0 Ω must
be observed over temperature to maintain stability.
In the Current Boost Circuit, shown in Figures 10 and 12,
an output current of up to 600 mA can be delivered by the
circuit. The circuit of Figure 10 has no current limit. In each
case, the external transistor must be rated for the expected
power dissipation. Figure 11 shows how a fixed output may
be programmed, using R1 and R2, to provide a higher
output voltage.
Figure 9. Typical Application
Vin
0.1 µF
23
MC78LC00
1
VO
0.1 µF
Gnd Gnd
Figure 10. Current Boost Circuit
MJD32C
.033 µF
100 2
3
Vin
MC78LC00
VO
0.1 µF
Gnd
1
0.1 µF
Gnd
Vin
C1
Figure 11. Adjustable VO
23
MC78LC00
1
ICC
R1
Gnd
R2
VO
C2
ǒ Ǔ+ ) )VO
VO(Reg) 1
R2
R1
ICC R2
Figure 12. Current Boost Circuit with
Overcurrent Limit Circuit
R2 MJD32C
Q1
Q2 .033 µF
MMBT2907
ALT1
Vin
R1
0.1 µF
Gnd
23
MC78LC00
1
VO
0.1 µF
Gnd
[ ) )IO(short circuit)
VBE2
R2
VBE1 VBE2
R1
MOTOROLA ANALOG IC DEVICE DATA
5
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