MC33267
SEMICONDUCTOR
TECHNICAL DATA
LOW DROPOUT
REGULATOR with
POWERUP RESET
Order this document by MC33267/D
1
5
T SUFFIX
PLASTIC PACKAGE
CASE 314D
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
1
Pin 1. VCC Input
2. Reset
3. Ground
4. Delay
5. Output
Heatsink surface connected to Pin 3.
5
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
Heatsink surface (shown as
terminal 6 in case outline
drawing) is connected to Pin 3.
1
5
1
MOTOROLA ANALOG IC DEVICE DATA
Low Dropout Regulator
The MC33267 is a positive fixed 5.0 V regulator that is specifically
designed to maintain proper voltage regulation with an extremely low
inputtooutput 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 onchip powerup 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 TO220 type package.
Low InputtoOutput Voltage Differential
Output Current in Excess of 500 mA
OnChip PowerUp Reset Circuit with Programmable Delay
Internal Current Limiting with Thermal Shutdown
Economical Five Lead TO220 Type Packages
ORDERING INFORMATION
Device
Tested Operating
Temperature Range
Package
MC33267T
TJ = 40
to +125
C
Plastic Power
MC33267TV
TJ = 40
to +125
C
Plastic Power
MC33267D2T
TJ = 40
to +105
C
Surface Mount
Representative Block Diagram
Input
Output
1
5
Reference
1.25 V
Thermal
Overcurrent
Detector
Ground
3
1.25 V
Delay
R
0.03
R
3.01
R
20
A
3.8 V
Reset
200
Reset
2
Delay
4
+
+
This device contains 37 active transistors.
Motorola, Inc. 1996
Rev 1
MC33267
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Input Voltage Range
Vin
20 to + 40
Vdc
Delay Voltage Range
VDLYR
0.3 to VO
V
Delay Sink Current
IDLY(sink)
25
mA
Reset Voltage Range
VRR
0.3 to +15
V
Reset Sink Current
IR(sink)
50
mA
Power Dissipation
Case 314B and 314D (TO220 Type)
TA = 25
C
Thermal Resistance, JunctiontoAmbient
Thermal Resistance, JunctiontoCase
Case 936A (D2PAK) [Note 1]
TA = 90
C
Thermal Resistance, JunctiontoAmbient
Thermal Resistance, JunctiontoCase
PD
R
JA
R
JC
PD
R
JA
R
JC
Internally Limited
62.5
4.0
Internally Limited
70
5.0
W
C/W
C/W
W
C/W
C/W
Operating Junction Temperature Range
TJ
40 to +150
C
Storage Temperature Range
Tstg
55 to +150
C
NOTE:
1. D2PAK JunctiontoAmbient Thermal Resistance is for vertical mounting. Refer to Figure 7
for board mounted thermal resistance.
ELECTRICAL CHARACTERISTICS
(Vin = 14.4 V, IO = 5.0 mA, CO = 100
F, CO(ESR)
0.3
, TJ = 25
C (Note 2), unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
Output Voltage (IO = 5.0 mA to 500 mA, Vin = 6.0 V to 28 V)
TJ = 25
C
TJ = 40
to +125
C
VO
4.95
4.9
5.05
5.15
5.2
V
Line Regulation (Vin = 6.0 V to 26 V)
Regline
3.0
50
mV
Load Regulation (IO = 5.0 mA to 500 mA)
Regload
1.0
50
mV
Bias Current
IO = 0 mA
IO = 150 mA
IO = 500 mA
IO = 500 mA, Vin = 6.2 V
IB
12
22
100
120
20
40
200
300
mA
Ripple Rejection (f = 120 Hz, Vin = 7.0 V to 17 V,
IO = 350 mA, CO = 100
F)
RR
60
80
dB
Dropout Voltage (IO = 500 mA)
Vin VO
0.58
0.8
V
Delay Comparator Threshold (VO Decreasing)
Vth(DLY)
4.8
VO 0.15 VO 0.08
V
Delay Pin Source Current
IDLY(source)
12
20
28
A
Reset Comparator Threshold
Vth(R)
3.6
3.8
4.0
V
Reset Sink Saturation (Isink = 10 mA)
VCE(sat)
0.2
0.8
V
Reset OffState Leakage (VCE = 5.0 V)
IR(leak)
0.3
10
A
NOTE: 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
MC33267
3
MOTOROLA ANALOG IC DEVICE DATA
+
0.1
Figure 1. Typical Application Circuit
Input
Output
1
5
Reference
1.25 V
Thermal
Overcurrent
Detector
Ground
3
1.25 V
Delay
R
0.03
R
3.01
R
20
A
3.8 V
Reset
200
Reset
Output
2
Delay
4
+
+
+
Cin
Vin
100
CO
VO
CDLY
+
Sink Only
Positive True Logic
=
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 onchip powerup 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
F with an equivalent
series resistance (ESR) of less than 0.3
. A minimum
capacitance of 33
F with a maximum ESR of 3.0
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
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 (CDLY) is immediately discharged, and the
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
A current source to charge CDLY. The reset
output will go to a high state when CDLY crosses the 3.8 V
threshold of the reset comparator. The reset delay time is
controlled by the value selected for CDLY. The required
system reset time is governed by the microprocessor and
usually a reset signal which lasts several machine cycles is
sufficient.
MC33267
4
MOTOROLA ANALOG IC DEVICE DATA
Figure 2. Timing Waveforms
5.05 V
4.97 V
4.90 V
4.70 V
3.80 V
0.48 V
5.05 V
0 V
Regulator Output
(Pin 5)
Delay Capacitor
(Pin 4)
Reset Output
(Pin 2)
tDLY
tDLY
150 mV
6.0
V
O
, OUTPUT
VOL
T
AGE
(V)
Figure 3. Reset Output versus Input Voltage
Vin, INPUT VOLTAGE (V)
Figure 4. Output Voltage versus Input Voltage
6.0
4.0
2.0
1.0
0
0
2.0
Vin, INPUT VOLTAGE (V)
3.0
V
O
, RESET
OUTPUT
VOL
T
AGE (V)
5.0
RL = 10 k to VO
TJ = 25
C
RL =
RL = 10
4.0
2.0
1.0
0
3.0
5.0
TJ = 25
C
RL =
RL = 10
0
2.0
4.0
6.0
8.0
4.0
6.0
8.0
MC33267
5
MOTOROLA ANALOG IC DEVICE DATA
6.0
V
O
, OUTPUT
VOL
T
AGE
(V)
Figure 5. Reset Output versus Input Voltage
Vin, INPUT VOLTAGE (V)
Figure 6. Output Voltage versus Input Voltage
6.0
4.0
2.0
1.0
0
0
2.0
Vin, INPUT VOLTAGE (V)
3.0
V
O
, RESET
OUTPUT
VOL
T
AGE (V)
5.0
RL = 10 k to VO
TJ = 25
C
RL =
RL = 10
4.0
2.0
1.0
0
3.0
5.0
TJ = 25
C
RL =
RL = 10
0
2.0
4.0
6.0
8.0
4.0
6.0
8.0
R
,
THERMAL
RESIST
ANCE
JA
JUNCTION-T
O-AIR ( C/W)
30
40
50
60
70
80
1.0
1.5
2.0
2.5
3.0
3.5
0
10
20
30
25
15
5.0
L, LENGTH OF COPPER (mm)
PD(max) for TA = 50
C
Minimum
Size Pad
2.0 oz. Copper
L
L
Free Air
Mounted
Vertically
P
D
, MAXIMUM POWER DISSIP
A
TION (W)
R
JA
Figure 7. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
PDF 
ZIP