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PDF MC78BC50NTR Data sheet ( Hoja de datos )
| Número de pieza | MC78BC50NTR | |
| Descripción | Micropower Voltage Regulator | |
| Fabricantes | ON | |
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MC78BC00 Series
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.
Features
• Ultra-Low Supply Current (50 mA)
• Standby Mode (0.2 mA)
• 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
3.0
MC78BC31NTR
3.1
MC78BC33NTR
3.3
MC78BC40NTR
MC78BC43NTR
4.0
TA = -30° to +80°C
SOT-23
4.3
MC78BC45NTR
4.5
MC78BC50NTR
5.0
Other voltages from 2.0 to 6.0 V, in 0.1 V increments, are available. Consult
factory for information.
Ext 4
2
Vin
3
VO
http://onsemi.com
VOLTAGE REGULATOR
WITH EXTERNAL POWER
TRANSISTOR
5
1
SOT-23
N SUFFIX
PLASTIC PACKAGE
CASE 1212
MARKING
DIAGRAM
5
xx D
1
xx = MC78BC30NTR = K0
= MC78BC31NTR = K1
= MC78BC33NTR = K3
= MC78BC40NTR = L0
= MC78BC43NTR = L3
= MC78BC45NTR = L5
= MC78BC50NTR = M0
D = Date Code
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.
Figure 1. Representative Block Diagram
© Semiconductor Components Industries, LLC, 2003
January, 2003 - Rev. 4
1
Gnd
1
Input 2
4
3
MC78BCXX
Cin 1
5
Output
CO
Publication Order Number:
MC78BC00/D
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 mF 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 W must
be observed over temperature to maintain stability.
External PNP Transistor
2
In
Vin
4 Ext
RA
VO
3
Error
Amplifier
Vref
RB
CE 5
Figure 9. Typical Operation
Gnd
1
Out
10 mF
http://onsemi.com
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