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
http://onsemi.com
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
ONSEMI [ ON SEMICONDUCTOR ]
