ON MC33267T Low dropout regulator with power-up reset Datasheet

Order this document by MC33267/D
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 Differential
•
•
•
•
Output Current in Excess of 500 mA
LOW DROPOUT
REGULATOR with
POWER–UP RESET
SEMICONDUCTOR
TECHNICAL DATA
Pin 1. VCC Input
2. Reset
3. Ground
4. Delay
5. Output
On–Chip Power–Up Reset Circuit with Programmable Delay
Internal Current Limiting with Thermal Shutdown
Economical Five Lead TO–220 Type Packages
1
5
ORDERING INFORMATION
Tested Operating
Temperature Range
Device
MC33267T
Package
Plastic Power
TJ = –40 ° to +125°C
MC33267TV
Plastic Power
TJ = –40 ° to +105°C
MC33267D2T
T SUFFIX
PLASTIC PACKAGE
CASE 314D
Surface Mount
1
5
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
Representative Block Diagram
Heatsink surface connected to Pin 3.
Input
Output
1
5
3.01
R
Reference
1.25 V
20 µA
Reset
Delay
200
+
1.25 V
Ground
5
3.8 V
Delay
Overcurrent
Detector
1
+
R
Thermal
Reset
2
0.03
R
3
4
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
Heatsink surface (shown as
terminal 6 in case outline
drawing) is connected to Pin 3.
This device contains 37 active transistors.
 Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
Rev 1
1
MC33267
MAXIMUM RATINGS
Symbol
Value
Unit
Input Voltage Range
Rating
Vin
– 20 to + 40
Vdc
Delay Voltage Range
VDLYR
– 0.3 to VO
V
IDLY(sink)
25
mA
VRR
– 0.3 to +15
V
IR(sink)
50
mA
PD
RθJA
RθJC
Internally Limited
62.5
4.0
W
°C/W
°C/W
PD
RθJA
RθJC
Internally Limited
70
5.0
W
°C/W
°C/W
TJ
–40 to +150
°C
Tstg
–55 to +150
°C
Delay Sink Current
Reset Voltage Range
Reset Sink Current
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
Storage Temperature Range
NOTE:
1. D2PAK Junction–to–Ambient 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 µF, CO(ESR) ≤ 0.3 Ω, TJ = 25°C (Note 2), unless otherwise noted.)
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
Symbol
Min
Typ
Max
4.95
4.9
5.05
–
5.15
5.2
VO
Unit
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
–
–
–
–
12
22
100
120
20
40
200
300
60
80
–
Bias Current
IO = 0 mA
IO = 150 mA
IO = 500 mA
IO = 500 mA, Vin = 6.2 V
IB
Ripple Rejection (f = 120 Hz, Vin = 7.0 V to 17 V,
IO = 350 mA, CO = 100 µF)
RR
mA
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
IDLY(source)
12
20
28
µA
Vth(R)
3.6
3.8
4.0
V
Reset Sink Saturation (Isink = 10 mA)
VCE(sat)
–
0.2
0.8
V
Reset Off–State Leakage (VCE = 5.0 V)
IR(leak)
–
0.3
10
µA
Delay Pin Source Current
Reset Comparator Threshold
NOTE: 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
2
MOTOROLA ANALOG IC DEVICE DATA
MC33267
Figure 1. Typical Application Circuit
Input
Vin
Cin
+
0.1
Output
1
5
3.01
R
CO
+
VO
100
20 µA
Reference
1.25 V
Reset
Output
Reset
2
0.03
R
+
3.8 V
R
Delay
Thermal
Delay
200
Overcurrent
Detector
+
4
+
CDLY
1.25 V
Ground
3
=
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 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
MOTOROLA ANALOG IC DEVICE DATA
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 µA 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.
3
MC33267
Figure 2. Timing Waveforms
Regulator Output
(Pin 5)
5.05 V
4.97 V
4.90 V
150 mV
4.70 V
3.80 V
Delay Capacitor
(Pin 4)
0.48 V
5.05 V
Reset Output
(Pin 2)
0V
tDLY
tDLY
Figure 3. Reset Output versus Input Voltage
Figure 4. Output Voltage versus Input Voltage
6.0
RL = 10 k to VO
TJ = 25°C
5.0
4.0
3.0
RL = 10 Ω
2.0
RL = ∞
1.0
0
0
2.0
4.0
Vin, INPUT VOLTAGE (V)
4
TJ = 25°C
5.0
VO , OUTPUT VOLTAGE (V)
VO , RESET OUTPUT VOLTAGE (V)
6.0
6.0
8.0
RL = ∞
4.0
RL = 10 Ω
3.0
2.0
1.0
0
0
2.0
4.0
Vin, INPUT VOLTAGE (V)
6.0
8.0
MOTOROLA ANALOG IC DEVICE DATA
MC33267
Figure 5. Reset Output versus Input Voltage
Figure 6. Output Voltage versus Input Voltage
6.0
RL = 10 k to VO
TJ = 25°C
5.0
4.0
3.0
RL = 10 Ω
2.0
RL = ∞
1.0
0
0
2.0
TJ = 25°C
5.0
VO , OUTPUT VOLTAGE (V)
VO , RESET OUTPUT VOLTAGE (V)
6.0
4.0
6.0
RL = ∞
4.0
3.0
2.0
1.0
0
0
8.0
RL = 10 Ω
2.0
Vin, INPUT VOLTAGE (V)
4.0
Vin, INPUT VOLTAGE (V)
6.0
8.0
JUNCTION-TO-AIR (°C/W)
R θ JA, THERMAL RESISTANCE
80
3.5
PD(max) for TA = 50°C
70
3.0
Free Air
Mounted
Vertically
60
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
2.0 oz. Copper
L
Minimum
Size Pad
50
L
40
RθJA
2.5
2.0
1.5
30
PD, MAXIMUM POWER DISSIPATION (W)
Figure 7. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
1.0
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
MOTOROLA ANALOG IC DEVICE DATA
5
MC33267
OUTLINE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 314D–03
(TO–220 TYPE)
ISSUE D
–T–
SEATING
PLANE
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION D DOES NOT INCLUDE
INTERCONNECT BAR (DAMBAR) PROTRUSION.
DIMENSION D INCLUDING PROTRUSION SHALL
NOT EXCEED 10.92 (0.043) MAXIMUM.
C
–Q–
B
E
U
A
DIM
A
B
C
D
E
G
H
J
K
L
Q
U
S
L
1 2 3 4 5
K
S
J
G
D
INCHES
MIN
MAX
0.572
0.613
0.390
0.415
0.170
0.180
0.025
0.038
0.048
0.055
0.067 BSC
0.087
0.112
0.015
0.025
1.020
1.065
0.320
0.365
0.140
0.153
0.105
0.117
0.543
0.582
MILLIMETERS
MIN
MAX
14.529 15.570
9.906 10.541
4.318
4.572
0.635
0.965
1.219
1.397
1.702 BSC
2.210
2.845
0.381
0.635
25.908 27.051
8.128
9.271
3.556
3.886
2.667
2.972
13.792 14.783
H
5 PL
0.356 (0.014)
M
T Q
M
TV SUFFIX
PLASTIC PACKAGE
CASE 314B–05
(TO–220 TYPE)
ISSUE J
Q
OPTIONAL
CHAMFER
E
A
U
K
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION D DOES NOT INCLUDE
INTERCONNECT BAR (DAMBAR) PROTRUSION.
DIMENSION D INCLUDING PROTRUSION SHALL
NOT EXCEED 0.043 (1.092) MAXIMUM.
C
B
–P–
S
L
W
5X
G
5X
D
0.10 (0.254)
M
T P
M
0.24 (0.610)
M
J
T
H
N
–T–
6
V
F
SEATING
PLANE
DIM
A
B
C
D
E
F
G
H
J
K
L
N
Q
S
U
V
W
INCHES
MIN
MAX
0.572
0.613
0.390
0.415
0.170
0.180
0.025
0.038
0.048
0.055
0.850
0.935
0.067 BSC
0.166 BSC
0.015
0.025
0.900
1.100
0.320
0.365
0.320 BSC
0.140
0.153
–––
0.620
0.468
0.505
–––
0.735
0.090
0.110
MILLIMETERS
MIN
MAX
14.529 15.570
9.906 10.541
4.318
4.572
0.635
0.965
1.219
1.397
21.590 23.749
1.702 BSC
4.216 BSC
0.381
0.635
22.860 27.940
8.128
9.271
8.128 BSC
3.556
3.886
––– 15.748
11.888 12.827
––– 18.669
2.286
2.794
MOTOROLA ANALOG IC DEVICE DATA
MC33267
OUTLINE DIMENSIONS
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A–02
(D2PAK)
ISSUE A
–T–
OPTIONAL
CHAMFER
A
TERMINAL 6
E
U
S
K
B
V
H
NOTES:
1 DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2 CONTROLLING DIMENSION: INCH.
3 TAB CONTOUR OPTIONAL WITHIN DIMENSIONS
A AND K.
4 DIMENSIONS U AND V ESTABLISH A MINIMUM
MOUNTING SURFACE FOR TERMINAL 6.
5 DIMENSIONS A AND B DO NOT INCLUDE MOLD
FLASH OR GATE PROTRUSIONS. MOLD FLASH
AND GATE PROTRUSIONS NOT TO EXCEED
0.025 (0.635) MAXIMUM.
1 2 3 4 5
M
D
0.010 (0.254)
M
T
N
G
C
MOTOROLA ANALOG IC DEVICE DATA
R
L
P
DIM
A
B
C
D
E
G
H
K
L
M
N
P
R
S
U
V
INCHES
MIN
MAX
0.386
0.403
0.356
0.368
0.170
0.180
0.026
0.036
0.045
0.055
0.067 BSC
0.539
0.579
0.050 REF
0.000
0.010
0.088
0.102
0.018
0.026
0.058
0.078
5 _ REF
0.116 REF
0.200 MIN
0.250 MIN
MILLIMETERS
MIN
MAX
9.804 10.236
9.042
9.347
4.318
4.572
0.660
0.914
1.143
1.397
1.702 BSC
13.691 14.707
1.270 REF
0.000
0.254
2.235
2.591
0.457
0.660
1.473
1.981
5 _ REF
2.946 REF
5.080 MIN
6.350 MIN
7
MC33267
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8
◊
*MC33267/D*
MOTOROLA ANALOG IC DEVICE
DATA
MC33267/D