MC78BC50NTRG [ONSEMI]
IC VREG 5 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5, PLASTIC, SOT-23, 5 PIN, Fixed Positive Single Output LDO Regulator;
| 型号： | MC78BC50NTRG |
| 厂家： | 
ONSEMI |
| 描述： | IC VREG 5 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5, PLASTIC, SOT-23, 5 PIN, Fixed Positive Single Output LDO Regulator 光电二极管 |
| 文件： | 总6页 (文件大小：197K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
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VOLTAGE REGULATOR WITH
EXTERNAL POWER
TRANSISTOR
SOT−23
N SUFFIX
PLASTIC PACKAGE
Features
1
CASE 1212
• Ultra−Low Supply Current (50 mA)
• Standby Mode (0.2 mA)
MARKING DIAGRAM
• Ultra−Low Dropout Voltage (0.1 V with External Transistor and
I = 100 mA)
O
5
• Excellent Line Regulation (Typically 0.1%/V)
• High Accuracy Output Voltage (±2.5%)
xx D
1
ORDERING INFORMATION
xx = MC78BC30NTR = K0
= MC78BC31NTR = K1
= MC78BC33NTR = K3
= MC78BC40NTR = L0
= MC78BC43NTR = L3
= MC78BC45NTR = L5
= MC78BC50NTR = M0
D = Date Code
Output
Voltage
Operating
Temperature Range
Device
Package
MC78BC30NTR
MC78BC31NTR
MC78BC33NTR
MC78BC40NTR
MC78BC43NTR
MC78BC45NTR
MC78BC50NTR
3.0
3.1
3.3
4.0
4.3
4.5
5.0
T = −30° to +80°C
SOT−23
A
PIN CONNECTIONS
1
2
3
5
Ground
Input
CE
1. Other voltages from 2.0 to 6.0 V, in 0.1 V increments, are available. Consult
factory for information.
Ext
4
Ext
Output
4
2
3
V
in
V
O
(Top View)
STANDARD APPLICATION
Q
C
C
4
V
ref
Input
Output
3
2
1
MC78BCXX
GND
C
in
C
O
1
5
CE
5
This device contains 13 active transistors.
Figure 1. Representative Block Diagram
© Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
September, 2006 − Rev. 7
MC78BC00/D
MC78BC00 Series
MAXIMUM RATINGS (T = 25°C, unless otherwise noted.)
C
Rating
Symbol
Value
Unit
Vdc
mW
Input Voltage
V
CC
10
Power Dissipation and Thermal Characteristics Maximum Power Dissipation
Case 1212 (SOT−23) H Suffix
P
D
150
333
Thermal Resistance, Junction−to−Ambient
R
°C/W
°C
q
JA
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature Range
T
J
125
T
A
−30 to +80
−40 to +125
°C
T
stg
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE: ESD data available upon request.
ELECTRICAL CHARACTERISTICS (V = V + 1.0 V, I = 50 mA, T = 25°C 9 (Note 2), unless otherwise noted.)
in
O
O
J
Characteristic
Symbol
Min
Typ
Max
Unit
Output Voltage
V
O
V
MC78BC30NTR
MC78BC31NTR
MC78BC33NTR
MC78BC40NTR
MC78BC43NTR
MC78BC45NTR
MC78BC50NTR
2.925
3.023
3.218
3.900
4.193
4.386
4.875
3.0
3.1
3.3
4.0
4.3
4.5
5.0
3.075
3.178
3.382
4.100
4.408
4.613
5.125
Line Regulation
Load Regulation
V
V
+ 0.5 V ≤ V ≤ 8.0 V
Reg
0
0.1
40
0.3
60
mV
mV
O
in
line
Reg
−
load
V
− V = 1.0 V
in
O
1.0 mA ≤ l ≤ 100 mA
O
Output Current (Note 3)
Dropout Voltage
− V = 1.0 V
l
O
−
−
−
1000
100
50
−
mA
mV
mA
in
O
I
O
= 100 mA
V
in
− V
O
200
80
Supply Current
l
ss
V
V
O
= 8.0 V
in
in
− V = 1.0 V
O
I
= 0 (at no load)
Supply Current (Standby) V = 8.0 V
l
0.1
0.2
1.0
0.5
mA
mA
V
in
standby
Ext Leakage Current
l
−
−
LK
Chip Enable Input Logic Voltage
Logic “0” (Regulator “On”)
Logic “1” (Regulator “Off”)
V
CE
0
1.5
−
−
0.25
8.0
Chip Enable Input Current
l
mA
CEL
V
CE
V
CE
= 0.25 V
= 1.5 V
−5.0
−
−3.0
−
−0.1
0.1
Output Voltage Temperature Coefficient
T
C
−
±100
−
ppm/°C
2. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
3. The output current depends upon the performance of External PNP Transistor. Use External PNP Transistor of a low saturation type, with
an H of 100 or more.
FE
DEFINITIONS
Dropout Voltage − The input/output voltage differential at
which the regulator output no longer maintains regulation
against further reductions in input voltage. Measured when
the output drops 100 mV below its nominal value (which is
measured at 1.0 V differential), dropout voltage is affected by
junction temperature, load current and minimum input supply
requirements.
of low dissipation or by using pulse techniques such that
average chip temperature is not significantly affected.
Load Regulation −The change in output voltage for a change
in load current at constant chip temperature.
Maximum Power Dissipation − The maximum total device
dissipation for which the regulator will operate within
specifications.
Supply Current − Current which is used to operate the
regulator chip and is not delivered to the load.
Line Regulation − The change in output voltage for a change
in input voltage. The measurement is made under conditions
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2
MC78BC00 Series
3.2
3.0
2.8
2.6
4.962
4.958
4.954
4.950
I = 0 mA
O
V = 6.0 V
in
I = 100 mA
O
V = 5.1 V
in
I = 500 mA
O
MC78BC50NTR
& MJD32C
T = 25°C
A
2.4
2.2
4.946
4.942
MC78BC30NTR
T = 25°C
A
2.0
4.0
7.0
8.0
9.0
0
200
400
600
3.0
5.0
6.0
100
300
500
V , INPUT VOLTAGE (V)
in
I , OUTPUT CURRENT (mA)
O
Figure 1. Output Voltage versus Input Voltage
Figure 2. Output Voltage versus Output Current
0.50
0.40
60
50
40
T = 80°C
A
0.30
0.20
T = 25°C
A
30
20
C = 10 mF
L
I = 200 mA
T = 25°C
A
MC78BC50NTR & MJD32C
T = −30°C
O
A
0.10
0
10
0
MC78BC50NTR & MJD32C
0
400
I , OUTPUT CURRENT (mA)
1.0 k
10 k
100 M
200
600
1000
1.0 M
800
1200
100 k
10 M
f, FREQUENCY (Hz)
O
Figure 3. Dropout Voltage versus Output Current
Figure 4. Ripple Rejection as a
Function of Frequency
5.00
60
50
40
4.98
4.96
4.94
30
20
10
0
MC78BC50NTR
& MJD32C
I = 100 mA
MC78BC50NTR
& MJD32C
I = 0 mA
O
O
V = 6.0 V
in
V = 6.0 V
in
4.92
−30
0
25
50
80
−30
0
25
50
80
T , AMBIENT TEMPERATURE (°C)
A
T , AMBIENT TEMPERATURE (°C)
A
Figure 5. Output Voltage versus Temperature
Figure 6. Supply Current versus Temperature
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3
MC78BC00 Series
50
500
500
400
8.0
7.0
400
40
Output Current
Input Voltage
300
30
200
V = 6.0 V
in
300
200
T = 25°C
A
C = 1.0 mF
20
L
100
6.0
MC78BC50NTR
& MJD32C
10
0
Output Voltage
100
0
−100
5.0 C = 1.0 mF
L
I = 100 mA
Output Voltage
0
O
−10
−20
−200
−300
T = 25°C
A
MC78BC50NTR & MJD32C
−100
4.0
0
20
40
60
80
100
120
140
0
4.0
8.0
12
16
20
24
t, TIME (ms)
t, TIME (ms)
Figure 7. Line Transient Response
Figure 8. Load Transient Response
APPLICATIONS INFORMATION
Introduction
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.
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
standby 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
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.
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4
MC78BC00 Series
External PNP Transistor
4
Ext
2
In
V
3
Out
O
V
in
R
R
A
10 mF
Error
Amplifier
B
V
ref
GND
1
CE
5
Figure 9. Typical Operation
External PNP Transistor
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
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
H
FE
of the external pass transistor.
MJD32C
Out
In
R1
10 mF
.033 mF
MJD32C
R2
4
.033 mF
10 k
Ext
3
V
O
MC78BCXXNTR
4
Figure 10. External PNP
Out
5.0 V
Ext
In
V
DD
V
O
2
3
10 mF
10 mF
MC78BC50NTR
GND
CE
1
5
Figure 11. Typical Application
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5
MC78BC00 Series
PACKAGE DIMENSIONS
SOT−23
N SUFFIX
PLASTIC PACKAGE
CASE 1212−01
ISSUE O
NOTES:
A2
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
B
A
D
S
0.05
A1
L
3. DATUM C IS A SEATING PLANE.
5
1
4
E
MILLIMETERS
2
3
DIM MIN
MAX
0.10
1.30
0.50
0.25
3.00
3.10
1.80
E1
A1
A2
B
0.00
1.00
0.30
0.10
2.80
2.50
1.50
0.95 BSC
1.90 BSC
0.20
0.45
C
L1
B
5X
C
C
M
S
S
0.10
C B
A
D
e
E
E1
e
e1
e1
L
−−−
0.75
L1
SOLDERING FOOTPRINT*
1.9
0.074
0.95
0.037
2.4
0.094
1.0
0.039
0.7
0.028
mm
inches
ǒ
Ǔ
SCALE 10:1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and
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MC78BC00/D
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