Motorola MC33267D2T, MC33267T Datasheet

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40 ° to +125°C

The MC33267 is a positive fixed 5.0 V regulator that is specifically designed to maintain proper voltage regulation with an extremely low input–to–output voltage differential. This device is capable of supplying output currents in excess of 500 mA and contains internal current limiting and thermal shutdown protection. Also featured is an on–chip power–up reset circuit that is ideally suited for use in microprocessor based systems. Whenever the regulator output voltage is below nominal, the reset output is held low. A programmable time delay is initiated after the regulator has reached its nominal level and upon timeout, the reset output is released.

Due to the low dropout voltage specifications, the MC33267 is ideally suited for use in battery powered industrial and consumer equipment where an extension of useful battery life is desirable. This device is contained in an economical five lead TO–220 type package.

• Low Input–to–Output Voltage Dif ferential

• Output Current in Excess of 500 mA

• On–Chip Power–Up Reset Circuit with Programmable Delay

• Internal Current Limiting with Thermal Shutdown

• Economical Five Lead TO–220 T ype Packages

ORDERING INFORMATION

Tested Operating

Device

MC33267T MC33267TV MC33267D2T TJ = –40 ° to +105°C Surface Mount

Temperature Range

–

= –

Package

Plastic Power Plastic Power

Order this document by MC33267/D



LOW DROPOUT

REGULATOR with

POWER–UP RESET

SEMICONDUCTOR

TECHNICAL DATA

Pin 1. VCC Input

2. Reset

3. Ground

4. Delay

5. Output

T SUFFIX

PLASTIC PACKAGE

CASE 314D

Representative Block Diagram

Input Output

Reference

1.25 V

Thermal

Overcurrent

Ground 3

This device contains 37 active transistors.

Detector

3.01

0.03

Reset

R R

Delay

1.25 V

3.8 V

200

MOTOROLA ANALOG IC DEVICE DATA

Reset 2

Delay 4

TV SUFFIX

PLASTIC PACKAGE

CASE 314B

Heatsink surface connected to Pin 3.

D2T SUFFIX

PLASTIC PACKAGE

CASE 936A

(D2PAK)

Heatsink surface (shown as

terminal 6 in case outline

drawing) is connected to Pin 3.

 Motorola, Inc. 1996 Rev 1

MC33267

MAXIMUM RATINGS

Rating Symbol Value Unit

Input Voltage Range V Delay Voltage Range V Delay Sink Current I Reset Voltage Range V Reset Sink Current I Power Dissipation

Case 314B and 314D (TO–220 Type)

TA = 25°C Thermal Resistance, Junction–to–Ambient Thermal Resistance, Junction–to–Case

Case 936A (D2PAK) [Note 1]

TA = 90°C Thermal Resistance, Junction–to–Ambient

Thermal Resistance, Junction–to–Case Operating Junction Temperature Range T Storage Temperature Range T

NOTE: 1.D2PAK Junction–to–Ambient Thermal Resistance is for vertical mounting. Refer to Figure 7

for board mounted thermal resistance.

DLYR

DLY(sink)

R(sink)

θJA

θJC

θJA

θJC

stg

– 20 to + 40 Vdc

– 0.3 to V

– 0.3 to +15 V

Internally Limited

–40 to +150 °C –55 to +150 °C

25 mA

50 mA

62.5

4.0

5.0

°C/W °C/W

ELECTRICAL CHARACTERISTICS (V

Characteristic

Output Voltage (IO = 5.0 mA to 500 mA, Vin = 6.0 V to 28 V)

TJ = 25°C

TJ = – 40° to +125°C Line Regulation (Vin = 6.0 V to 26 V) Reg Load Regulation (IO = 5.0 mA to 500 mA) Reg Bias Current

IO = 0 mA

IO = 150 mA

IO = 500 mA

IO = 500 mA, Vin = 6.2 V Ripple Rejection (f = 120 Hz, Vin = 7.0 V to 17 V,

IO = 350 mA, CO = 100 µF) Dropout Voltage (IO = 500 mA) Vin – V Delay Comparator Threshold (VO Decreasing) V Delay Pin Source Current I Reset Comparator Threshold V Reset Sink Saturation (I Reset Off–State Leakage (VCE = 5.0 V) I

NOTE: 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

= 10 mA) V

sink

= 14.4 V, IO = 5.0 mA , CO = 100 µF, C

≤ 0.3 Ω, TJ = 25°C (Note 2), unless otherwise noted.)

O(ESR)

Symbol Min Typ Max Unit

line

load

th(DLY)

DLY(source)

th(R)

CE(sat)

R(leak)

4.95

4.9 – 3.0 50 mV – 1.0 50 mV

– – – –

60 80 –

– 0.58 0.8 V

4.8 VO– 0.15 VO– 0.08 V

12 20 28 µA

3.6 3.8 4.0 V – 0.2 0.8 V – 0.3 10 µA

5.05 –

22 100 120

5.15

5.2

mA 20 40

200 300

MOTOROLA ANALOG IC DEVICE DATA

MC33267

Figure 1. T ypical Application Circuit

Input Output

1 5

0.1

Reference

1.25 V

Thermal

Overcurrent

Detector

Ground 3

APPLICATION CIRCUIT INFORMATION

The MC33267 is a low dropout, positive fixed 5.0 V, 500 mA regulator. Protection features include output current limiting and thermal shutdown. System protection consists of an on–chip power–up microprocessor reset circuit.

A typical applications circuit is shown in Figure 1. The input bypass capacitor (Cin) is recommended if the regulator is located an appreciable distance (≥ 4″) from the supply input filter. This will reduce the circuit’s sensitivity to the input line impedance at high frequencies.

These regulators are not internally compensated and thus require an external output capacitor (CO) for stability. The recommended capacitance is 100 µF with an equivalent series resistance (ESR) of less than 0.3 Ω. A minimum capacitance of 33 µF with a maximum ESR of 3.0 Ω can be used in applications where space is a premium, however, these limits must be observed over the entire operating temperature range of the regulator circuit.

With economical electrolytic capacitors, cold temperature operation can pose a serious stability problem. As the electrolyte freezes, around – 30°C, the capacitance will

100C

3.01

0.03

Delay

1.25 V

Sink Only

Positive True Logic

Reset

3.8 V Delay

200

Reset Output

DLY

decrease and the ESR will increase drastically, causing the circuit to oscillate. Quality electrolytic capacitors with extended temperature ranges of – 40°C to + 85°C and –55°C to +105°C are readily available. It is suggested that oven testing of the entire circuit be performed with maximum load, minimum input voltage, and minimum ambient temperature.

Figure 2 shows the reset circuit timing relationship. Note that whenever the regulator’s output is less than 4.9 V, the delay capacitor (C

) is immediately discharged, and the

DLY

reset output is held in a low state. As the regulator’s output voltage increases beyond 4.97 V, the delay comparator will allow the 20 µA current source to charge C output will go to a high state when C

DLY

. The reset

DLY

crosses the 3.8 V threshold of the reset comparator. The reset delay time is controlled by the value selected for C

. The required

DLY

system reset time is governed by the microprocessor and usually a reset signal which lasts several machine cycles is sufficient.

MOTOROLA ANALOG IC DEVICE DATA

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