MC34166 Datasheet, PDF (1/16 Pages) ON Semiconductor – POWER SWITCHING REGULATORS

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Power Switching Regulators
MC34166
MC33166
The MC34166, MC33166 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 µA.
• Output Switch Current in Excess of 3.0 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 µA
• Economical 5–Lead TO–220 Package with Two Optional Leadforms
• Also Available in Surface Mount D2PAK Package
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
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/3.0 A
Pin 1. Voltage Feedback Input
2. Switch Output
3. Ground
4. Input Voltage/VCC
5. Compensation/Standby
D2T SUFFIX
PLASTIC PACKAGE
CASE 936A
1
(D2PAK)
5
Heatsink surface (shown as terminal 6
in case outline drawing) is connected to Pin 3.
ORDERING INFORMATION
Operating
Device Temperature Range Package
MC33166D2T
Surface Mount
MC33166T _{TA = – 40° to + 85°C} Straight Lead
MC33166TH
Horiz. Mount
MC33166TV
Vertical Mount
MC34166D2T
Surface Mount
MC34166T
MC34166TH
TA = 0° to + 70°C ^{Straight Lead}
Horiz. Mount
MC34166TV
Vertical Mount
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 4
1