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MC34167 Datasheet, PDF (1/16 Pages) ON Semiconductor – POWER SWITCHING REGULATORS | |||
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Order this document by MC34167/D
Power Switching Regulators
MC34167
MC33167
The MC34167, MC33167 series are high performance fixed frequency
power switching regulators that contain the primary functions required for
dcâtoâdc converters. This series was specifically designed to be
incorporated in stepâdown and voltageâinverting configurations with a
minimum number of external components and can also be used cost
effectively in stepâup applications.
These devices consist of an internal temperature compensated
reference, fixed frequency oscillator with onâchip timing components,
latching pulse width modulator for single pulse metering, high gain error
amplifier, and a high current output switch.
Protective features consist of cycleâbyâcycle current limiting,
undervoltage lockout, and thermal shutdown. Also included is a low power
standby mode that reduces power supply current to 36 µA.
⢠Output Switch Current in Excess of 5.0 A
⢠Fixed Frequency Oscillator (72 kHz) with OnâChip Timing
⢠Provides 5.05 V Output without External Resistor Divider
⢠Precision 2% Reference
⢠0% to 95% Output Duty Cycle
⢠CycleâbyâCycle 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 µA
⢠Economical 5âLead TOâ220 Package with Two Optional Leadforms
⢠Also Available in Surface Mount D2PAK Package
Simplified Block Diagram
(Step Down Application)
Vin
ILIMIT
4
Oscillator
S
Q
R
2
PWM
Thermal
UVLO
Reference
EA
1
3
5
This device contains 143 active transistors.
L
VO
5.05 V/5.0 A
POWER SWITCHING
REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
TH SUFFIX
PLASTIC PACKAGE
CASE 314A
1
5
1
5
TV SUFFIX
PLASTIC PACKAGE
CASE 314B
Heatsink surface connected to Pin 3.
T SUFFIX
PLASTIC PACKAGE
CASE 314D
1
5
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
1
5
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
(D2PAK)
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
ORDERING INFORMATION
Operating
Device Temperature Range Package
MC33167D2T
Surface Mount
MC33167T
Straight Lead
MC33167TH TA = â 40° to +85°C Horiz. Mount
MC33167TV
Vertical Mount
MC34167D2T
Surface Mount
MC34167T
Straight Lead
MC34167TH TA = 0° to + 70°C Horiz. Mount
MC34167TV
Vertical Mount
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 3
1
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