Datasheet MC78BC50NTR, MC78BC40NTR, MC78BC30NTR, MC78BC33NTR Datasheet (Motorola)

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T

30° to +80°C

SOT–23

  

Order this document by MC78BC00/D

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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

Output

Device

MC78BC30NTR 3.0
MC78BC33NTR 3.3
MC78BC40NTR 4.0
MC78BC50NTR 5.0

Other voltages from 2.0 to 6.0 V , in 0.1 V increments, are available. Consult factory for
information.

Voltage

Operating

Temperature Range

–

°

A

= –

°

Package

–

VOLTAGE REGULATOR

WITH EXTERNAL POWER

TRANSISTOR

SEMICONDUCTOR

TECHNICAL DATA

5

1

N SUFFIX

PLASTIC PACKAGE

CASE 1212

(SOT–23)

PIN CONNECTIONS

15

Ground

Input

Output

2
3

CE

Ext

4

Representative Block Diagram

2

V

in

V

ref

This device contains 13 active transistors.

This document contains information on a new product. Specifications and information herein
are subject to change without notice.

MOTOROLA ANALOG IC DEVICE DATA

4Ext

5CE

(Top View)

3

V

O

Standard Application

Q

C

C

Input Output

1

Gnd

 Motorola, Inc. 1996 Rev 0

2

C

in

4

MC78BCXX

1

3

C

5

O

1

MC78BC00 Series

MAXIMUM RATINGS (T

Input Voltage V
Power Dissipation and Thermal Characteristics

Maximum Power Dissipation mW

Case 1212 (SOT–23) H Suffix P
Thermal Resistance, Junction–to–Ambient R

Operating Junction Temperature T
Operating Ambient Temperature T
Storage Temperature Range T

NOTE: ESD data available upon request.

ELECTRICAL CHARACTERISTICS (V

Output Voltage V

MC78BC30NTR 2.925 3.0 3.075
MC78BC33NTR 3.218 3.3 3.382
MC78BC40NTR 3.900 4.0 4.100
MC78BC50NTR 4.875 5.0 5.125

Line Regulation Reg

VO + 0.5 V ≤ Vin ≤ 8.0 V

Load Regulation Reg

Vin – VO = 1.0 V

1.0 mA ≤ lO ≤ 100 mA

Output Current (Note 2) l

Vin – VO = 1.0 V

Dropout Voltage Vin – V

IO = 100 mA

Supply Current l

Vin = 8.0 V
Vin – VO = 1.0 V
IO = 0 (at no load)

Supply Current (Standby) l

Vin = 8.0 V
Ext Leakage Current l
Chip Enable Input Logic Voltage V

Logic “0” (Regulator “On”) 0 – 0.25

Logic “1” (Regulator “Off”) 1.5 – 8.0
Chip Enable Input Current l

VCE = 0.25 V –5.0 –3.0 –0.1

VCE = 1.5 V – – 0.1
Output Voltage Temperature Coefficient T

NOTES: 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

2. The output current depends upon the performance of External PNP Transistor. Use External PNP Transistor of a low saturation type,
with an HFE of 100 or more.

= 25°C, unless otherwise noted.)

C

Rating

in

Characteristic

Symbol Value Unit

CC

D

θJA

J
A

stg

= VO + 1.0 V, IO = 50 mA, TJ = 25°C [Note 1], unless otherwise noted.)

Symbol Min Typ Max Unit

standby

10 Vdc

150
333 °C/W

125 °C

–30 to +80 °C

–40 to +125 °C

O

line

load

O

O

ss

LK

CE

CEL

C

0 0.1 0.3 mV

– 40 60 mV

– 1000 – mA

– 100 200 mV

– 50 80 µA

0.1 0.2 1.0 µA

– – 0.5 µA

– ±100 – ppm/°C

V

V

µA

2

MOTOROLA ANALOG IC DEVICE DATA

MC78BC00 Series

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.

Line Regulation – The change in output voltage for a
change in input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques

Figure 1. Output V oltage versus Input Voltage

3.2
IO = 0 mA

3.0

IO = 100 mA

IO = 500 mA

4.0

5.0

Vin, INPUT VOLTAGE (V)

6.0

MC78BC30NTR

°

C

TA = 25

8.0 9.0 400 600

7.0

, OUTPUT VOL TAGE (V)
V

2.8

2.6

O

2.4

2.2

2.0

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.

Figure 2. Output Voltage versus Output Current

4.962

Vin = 6.0 V

Vin = 5.1 V

500

, OUTPUT VOL TAGE (V)
V

O

4.958

4.954

4.950

4.946

4.942
0

MC78BC50NTR
& MJD32C

°

C

TA = 25

1003.0
IO, OUTPUT CURRENT (mA)

200

300

Figure 3. Dropout Voltage versus Output Current

0.50

0.40

0.30

0.20

, DROPOUT VOLTAGE (mV)

O

–V

0.10

in

V

0

0

TA = 25°C

MC78BC50NTR & MJD32C

200

400

IO, OUTPUT CURRENT (mA)

600

TA = 80°C

TA = –30°C

800

1000

Figure 4. Ripple Rejection as a

Function of Frequency

60

50

40

30

20

CL = 10 µF

RR, RIPPLE REJECTION (dB)

IO = 200 mA

10

0

1.0 k

°

C

TA = 25
MC78BC50NTR & MJD32C

10 k

100 k

f, FREQUENCY (Hz)

1.0 M

10 M1200

100 M

MOTOROLA ANALOG IC DEVICE DATA

3

MC78BC00 Series

Figure 5. Output V oltage versus Temperature

5.00

4.98

4.96

4.94

4.92
–30

MC78BC50NTR
& MJD32C
IO = 100 mA
Vin = 6.0 V

, OUTPUT VOL TAGE (V)
V

O

Figure 7. Line Transient Response Figure 8. Load Transient Response

8.0

7.0

6.0

, OUTPUT CURRENT (mA)

CL = 1.0 µF

5.0

O

I

IO = 100 mA

°

C

TA = 25
MC78BC50NTR & MJD32C

4.0
0

Figure 6. Supply Current versus T emperature

60

50

40

30

20

ss

10

500
400

300
200
100

–100

O

–200
–300

0
–30

0

0

MC78BC50NTR
& MJD32C
IO = 0 mA
Vin = 6.0 V

TA, AMBIENT TEMPERATURE (°C)

Vin = 6.0 V
TA = 25
CL = 1.0
MC78BC50NTR
& MJD32C

4.020 8.040 1260 1680 20100 24120 140

Output Current

°

C

µ

F

Output Voltage

t, TIME (

µ

s)

, SUPPLY CURRENT (mV)
I

0 25 50 80 0 25 50 80
TA, AMBIENT TEMPERATURE (°C)

50

Input Voltage

Output Voltage

t, TIME (µs)

40

30
20
10

0
–10

–20

, OUTPUT VOL TAGE DEVIATION (mV)

O

V

, OUTPUT CURRENT (mA)
I

500

400

300

200

100

0
–100

, OUTPUT VOL TAGE DEVIATION (mV)

O

V

4

MOTOROLA ANALOG IC DEVICE DATA

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

Figure 9. T ypical Operation

External PNP Transistor

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 .

Ext

4

2

In

V

in

R

A

Error
Amplifier

R

B

V

ref

CE

5

V

O

3

Gnd
1

Out

10 µF

MOTOROLA ANALOG IC DEVICE DATA

5

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

Figure 10. External PNP

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.

In

R1

MC78BCXXNTR

MJD32C

R2

Ext

.033 µF

34 V

10

O

Out

µ

F

Figure 11. Typical Application

MJD32C

10 k

4

In

V

DD

2

Ext

.033 µF

V

O

3

Out

5.0 V

MC78BC50NTR

Gnd

1

10 µF10 µF

CE

5

6

MOTOROLA ANALOG IC DEVICE DATA

MC78BC00 Series

OUTLINE DIMENSIONS

N SUFFIX

PLASTIC PACKAGE

CASE 1212

(SOT–23)

ISSUE O

NOTES:

1. DIMENSIONS ARE IN MILLIMETERS.

2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.

3. DATUM C IS A SEATING PLANE.

MILLIMETERS

DIM MIN MAX

A1 0.00 0.10
A2 1.00 1.30

B 0.30 0.50
C 0.10 0.25
D 2.80 3.00
E 2.50 3.10

E1 1.50 1.80

e 0.95 BSC

e1 1.90 BSC

L

0.20 –––

L1 0.45 0.75

A

E

D

1523

B

4

0.05

A2

S

A1

L

E1

L1

B 5X

M

e

0.10 CSBSA

C

C

e1

MOTOROLA ANALOG IC DEVICE DATA

7

MC78BC00 Series

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
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and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.

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MOTOROLA ANALOG IC DEVICE DATA

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MC78BC00/D