Motorola MC78BC50NTR, MC78BC40NTR, MC78BC30NTR, MC78BC33NTR Datasheet

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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