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MC34167, MC33167
5.0 A, Step−Up/Down/
Inverting Switching
Regulators
The MC34167, MC33167 series are high performance fixed
frequency power switching regulators that contain the primary
functions required for dc−to−dc converters. This series was
specifically designed to be incorporated in step−down and
voltage−inverting configurations with a minimum number of external
components and can also be used cost effectively in step−up
applications.
These devices consist of an internal temperature compensated
reference, fixed frequency oscillator with on−chip timing components,
latching pulse width modulator for single pulse metering, high gain
error amplifier, and a high current output switch.
Protective features consist of cycle−by−cycle current limiting,
undervoltage lockout, and thermal shutdown. Also included is a low
power standby mode that reduces power supply current to 36
mA.
Features
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MARKING
DIAGRAMS
TO−220
TH SUFFIX
CASE 314A
1
5
MC
3x167T
AWLYWWG
Heatsink surface connected to Pin 3
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Output Switch Current in Excess of 5.0 A
Fixed Frequency Oscillator (72 kHz) with On−Chip Timing
Provides 5.05 V Output without External Resistor Divider
Precision 2% Reference
0% to 95% Output Duty Cycle
Cycle−by−Cycle Current Limiting
Undervoltage Lockout with Hysteresis
Internal Thermal Shutdown
Operation from 7.5 V to 40 V
Standby Mode Reduces Power Supply Current to 36
mA
Economical 5−Lead TO−220 Package with Two Optional Leadforms
Also Available in Surface Mount D
2
PAK Package
Moisture Sensitivity Level (MSL) Equals 1
Pb−Free Packages are Available
V
in
I
LIMIT
Oscillator
4
1
5
TO−220
TV SUFFIX
CASE 314B
MC
3x167T
AWLYWWG
1
5
Pin
1.
2.
3.
4.
5.
TO−220
T SUFFIX
CASE 314D
MC
3x167T
AWLYWWG
S
Q
R
2
1
UVLO
Voltage Feedback Input
Switch Output
Ground
Input Voltage/V
CC
Compensation/Standby
D
2
PAK
D2T SUFFIX
CASE 936A
PWM
MC
3x167T
AWLYWWG
5
L
Heatsink surface (shown as
terminal 6 in case outline
1
drawing) is connected to Pin 3
x
A
WL
Y
WW
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
5
Thermal
Reference
EA
1
V
O
5.05 V/
5.0 A
3
5
This device contains 143 active transistors.
Figure 1. Simplified Block Diagram
(Step Down Application)
©
Semiconductor Components Industries, LLC, 2005
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
1
November, 2005 − Rev. 7
Publication Order Number:
MC34167/D
MC34167, MC33167
MAXIMUM RATINGS
(Note 1 and 2)
Rating
Power Supply Input Voltage
Switch Output Voltage Range
Voltage Feedback and Compensation Input Voltage Range
Power Dissipation
Case 314A, 314B and 314D (T
A
= +25°C)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 936A (D
2
PAK) (T
A
= +25°C)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Operating Junction Temperature
Operating Ambient Temperature (Note 3)
MC34167
MC33167
Storage Temperature Range
Symbol
V
CC
V
O(switch)
V
FB,
V
Comp
P
D
q
JA
q
JC
P
D
q
JA
q
JC
T
J
T
A
0 to + 70
− 40 to + 85
T
stg
− 65 to +150
°C
Value
40
−2.0 to + V
in
−1.0 to + 7.0
Internally Limited
65
5.0
Internally Limited
70
5.0
+150
Unit
V
V
V
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Maximum package power dissipation limits must be observed to prevent thermal shutdown activation.
2. This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL−STD−883, Method 3015.
Machine Model Method 200 V.
3. T
low
= 0°C for MC34167
T
high
= + 70°C for MC34167
= − 40°C for MC33167
= + 85°C for MC33167
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2
MC34167, MC33167
ELECTRICAL CHARACTERISTICS
(V
CC
= 12 V, for typical values T
A
= +25°C, for min/max values T
A
is the operating ambient
temperature range that applies (Notes 4, 5), unless otherwise noted.)
Characteristic
OSCILLATOR
Frequency (V
CC
= 7.5 V to 40 V)
ERROR AMPLIFIER
Voltage Feedback Input Threshold
T
A
=+ 25°C
T
A
= T
low
to T
high
V
FB(th)
Reg
line
I
IB
PSRR
V
OH
V
OL
4.95
4.85
−
−
60
4.2
−
5.05
−
0.03
0.15
80
4.9
1.6
5.15
5.20
0.078
1.0
−
−
1.9
V
%/V
mA
dB
V
T
A
= +25°C
T
A
= T
low
to T
high
f
OSC
65
62
72
−
79
81
kHz
Symbol
Min
Typ
Max
Unit
Line Regulation (V
CC
= 7.5 V to 40 V, T
A
= +25°C)
Input Bias Current (V
FB
= V
FB(th)
+ 0.15 V)
Power Supply Rejection Ratio (V
CC
= 10 V to 20 V, f = 120 Hz)
Output Voltage Swing
PWM COMPARATOR
Duty Cycle (V
CC
= 20 V)
SWITCH OUTPUT
Output Voltage Source Saturation (V
CC
= 7.5 V, I
Source
= 5.0 A)
Off−State Leakage (V
CC
= 40 V, Pin 2 = GND)
Current Limit Threshold (V
CC
= 7.5 V)
Switching Times (V
CC
= 40 V, I
pk
= 5.0 A, L = 225
mH,
T
A
= +25°C)
Output Voltage Rise Time
Output Voltage Fall Time
UNDERVOLTAGE LOCKOUT
Startup Threshold (V
CC
Increasing, T
A
= +25°C)
Hysteresis (V
CC
Decreasing, T
A
= +25°C)
TOTAL DEVICE
Power Supply Current (T
A
= +25°C )
Standby (V
CC
= 12 V, V
Comp
< 0.15 V)
Operating (V
CC
= 40 V, Pin 1 = GND for maximum duty cycle)
Maximum (V
FB
= 0 V)
Minimum (V
Comp
= 1.9 V)
High State (I
Source
= 75
mA,
V
FB
= 4.5 V)
Low State (I
Sink
= 0.4 mA, V
FB
= 5.5 V)
DC
(max)
DC
(min)
92
0
95
0
100
0
%
V
sat
I
sw(off)
I
pk(switch)
t
r
t
f
V
th(UVLO)
V
H(UVLO)
I
CC
−
−
5.5
−
−
(V
CC
−1.5)
0
6.5
100
50
(V
CC
−1.8)
100
8.0
200
100
V
mA
A
ns
5.5
0.6
5.9
0.9
6.3
1.2
V
V
−
−
36
40
100
60
mA
mA
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
5. T
low
= 0°C for MC34167
T
high
= + 70°C for MC34167
= − 40°C for MC33167
= + 85°C for MC33167
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MC34167, MC33167
V FB(th), VOLTAGE FEEDBACK INPUT THRESHOLD (V)
5.25
V
CC
= 12 V
5.17
5.09
5.01
V
FB(th)
Min = 4.95 V
4.93
4.85
− 55
V
FB(th)
Max = 5.15 V
100
I IB, INPUT BIAS CURRENT (nA)
80
60
40
20
0
− 55
V
CC
= 12 V
V
FB
= V
FB(th)
V
FB(th)
Typ = 5.05 V
− 25
0
25
50
75
T
A
, AMBIENT TEMPERATURE (°C)
100
125
− 25
0
25
50
75
T
A
, AMBIENT TEMPERATURE (°C)
100
125
Figure 2. Voltage Feedback Input Threshold
versus Temperature
Figure 3. Voltage Feedback Input Bias
Current versus Temperature
A VOL , OPEN LOOP VOLTAGE GAIN (dB)
80
Gain
60
40
30
60
90
φ
, EXCESS PHASE (DEGREES)
V
CC
= 12 V
V
Comp
= 3.25 V
R
L
= 100 k
T
A
= +25°C
0
Vsat , OUTPUT SATURATION VOLTAGE (V)
100
2.0
1.6
1.2
0.8
0.4
0
V
CC
= 12 V
V
FB
= 5.5 V
T
A
= +25°C
Phase
20
0
120
150
180
10 M
− 20
10
100
1.0 k
10 k
100 k
f, FREQUENCY (Hz)
1.0 M
0
0.4
0.8
1.2
1.6
I
Sink
, OUTPUT SINK CURRENT (mA)
2.0
Figure 4. Error Amp Open Loop Gain and
Phase versus Frequency
Figure 5. Error Amp Output Saturation
versus Sink Current
Δ
f OSC, OSCILLATOR FREQUENCY CHANGE (%)
DC, SWITCH OUTPUT DUTY CYCLE (%)
4.0
V
CC
= 12 V
100
80
60
40
20
0
1.5
V
CC
= 12 V
T
A
= +25°C
0
− 4.0
− 8.0
− 12
− 55
− 25
0
25
50
75
100
T
A
, AMBIENT TEMPERATURE (°C)
125
2.0
2.5
3.0
3.5
4.0
V
Comp
, COMPENSATION VOLTAGE (V)
4.5
Figure 6. Oscillator Frequency Change
versus Temperature
Figure 7. Switch Output Duty Cycle
versus Compensation Voltage
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4
Embedded System
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