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MC78BC50NTR Schematic ( PDF Datasheet ) - Motorola Semiconductors

Teilenummer MC78BC50NTR
Beschreibung VOLTAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR
Hersteller Motorola Semiconductors
Logo Motorola Semiconductors Logo 




Gesamt 8 Seiten
MC78BC50NTR Datasheet, Funktion
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






MC78BC50NTR Datasheet, Funktion
MC78BC00 Series
External PNP Transistor
The external pin of this IC is protected by a current limit
circuit from the destruction caused by excess current. The R2
resistor shown in Figure 10 is used for the protection of the
external transistor, although this circuit can operate without
the resistor. Resistor R2 should be determined via the input
voltage, output voltage, output current, temperature and the
HFE of the external pass transistor.
Figure 10. External PNP
MJD32C
In
Out
R1 10 µF
.033 µF
R2
4 Ext
3 VO
MC78BCXXNTR
Figure 11. Typical Application
MJD32C
10 k .033 µF
4
In VDD
2
Ext
VO
3
10 µF
MC78BC50NTR
Gnd CE
15
Out
5.0 V
10 µF
6 MOTOROLA ANALOG IC DEVICE DATA

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