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PDF MC78BC33NTR Data sheet ( Hoja de datos )
| Número de pieza | MC78BC33NTR | |
| Descripción | VOLTAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Advance Information
Micropower Voltage Regulator
The MC78BC00 voltage regulators are specifically designed to be used
with an external power transistor to deliver high current with high voltage
accuracy and low quiescent current.
The MC78BC00 series are devices suitable for constructing regulators
with ultra–low dropout voltage and output current in the range of several tens
of mA to hundreds of mA. These devices have a chip enable function, which
minimizes the standby mode current drain. Each of these devices contains a
voltage reference unit, an error amplifier, a driver transistor and feedback
resistors. These devices are available in the SOT–23, 5 pin surface mount
packages.
These devices are ideally suited for battery powered equipment, and
power sources for hand–held audio instruments, communication equipment
and domestic appliances.
MC78BC00 Series Features:
• Ultra–Low Supply Current (50 µA)
• Standby Mode (0.2 µA)
• Ultra–Low Dropout Voltage (0.1 V with External Transistor and
IO = 100 mA)
• Excellent Line Regulation (Typically 0.1%/V)
• High Accuracy Output Voltage (±2.5%)
ORDERING INFORMATION
Device
Output
Voltage
Operating
Temperature Range
Package
MC78BC30NTR
MC78BC33NTR
MC78BC40NTR
MC78BC50NTR
3.0
3.3
4.0
TA = –30° to +80°C
SOT–23
5.0
Other voltages from 2.0 to 6.0 V, in 0.1 V increments, are available. Consult factory for
information.
2
Vin
Representative Block Diagram
Ext 4
3
VO
Order this document by MC78BC00/D
MC78BC00
Series
VOLTAGE REGULATOR
WITH EXTERNAL POWER
TRANSISTOR
SEMICONDUCTOR
TECHNICAL DATA
5
1
N SUFFIX
PLASTIC PACKAGE
CASE 1212
(SOT–23)
PIN CONNECTIONS
Ground 1
5 CE
Input 2
Output 3
4 Ext
(Top View)
Standard Application
Q
CC
Vref
CE 5
This device contains 13 active transistors.
1
Gnd
This document contains information on a new product. Specifications and information herein
arMe OsuTbjOecRt tOo cLhAangAeNwAithLoOut GnotIiCce.DEVICE DATA
Input 2
4
3
MC78BCXX
Cin 1
5
Output
CO
© Motorola, Inc. 1996
Rev 0
1
1 page  
MC78BC00 Series
APPLICATIONS INFORMATION
Introduction
The MC78BC00 series of micropower voltage regulators
are specifically designed for ultra–low dropout voltage and an
output current which ranges from several tens of mA to
several hundreds of mA making them ideal for
battery–powered equipment. These regulators also have a
chip enable function which minimizes supply current in
stand–by mode. An input bypass capacitor is recommended
if the regulator is located an appreciable distance (≥ 4 inches)
from the input voltage source. These regulators require a
10 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.
Figure 9. Typical Operation
External PNP Transistor
2
In
Vin
Vref
4 Ext
RA
VO
3
Error
Amplifier
RB
Out
10 µF
CE 5
Gnd
1
MOTOROLA ANALOG IC DEVICE DATA
5
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| PDF Descargar | [ Datasheet MC78BC33NTR.PDF ] | |
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