Overview
The MC33167T, part of the MC34167 and MC33167 series, is a high-performance fixed frequency power switching regulator designed by onsemi. These devices are optimized for dc-to-dc converter applications and are specifically tailored for step-down and voltage-inverting configurations with a minimal number of external components. They can also be used efficiently in step-up converter applications. The MC33167T integrates all the necessary active functions, including an internal temperature-compensated reference, a fixed frequency oscillator, a latching pulse width modulator, a high gain error amplifier, and a high current output switch.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Oscillator Frequency (VCC = 7.5 V to 40 V) | fOSC | 65 | 72 | 79 | kHz |
| Voltage Feedback Input Threshold | VFB(th) | 4.95 | 5.05 | 5.20 | V |
| Line Regulation (VCC = 7.5 V to 40 V, TA = +25°C) | Regline | -0.03 | 0.078 | /V | |
| Input Bias Current (VFB = VFB(th) + 0.15 V) | IIB | -0.15 | 1.0 | μA | |
| Power Supply Input Voltage | VCC | 40 | V | ||
| Operating Ambient Temperature | TA | -40 | +85 | °C | |
| Storage Temperature Range | Tstg | -65 | +150 | °C | |
| Thermal Resistance, Junction-to-Ambient | θJA | 65 | °C/W | ||
| Thermal Resistance, Junction-to-Case | θJC | 5.0 | °C/W |
Key Features
- 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 μA
- Economical 5-Lead TO-220 Package with Two Optional Leadforms
- Also Available in Surface Mount D2PAK Package
- Moisture Sensitivity Level (MSL) Equals 1
- Pb-Free Packages are Available
Applications
The MC33167T is suitable for a variety of applications, including:
- Automotive systems
- Computer and industrial power supplies
- Cost-sensitive consumer products
- Digital TV (LCD, PDP)
- Efficient system pre-regulator for linear voltage regulators
- Battery chargers
Q & A
- What is the typical oscillator frequency of the MC33167T?
The typical oscillator frequency is 72 kHz.
- What is the maximum output switch current of the MC33167T?
The maximum output switch current is in excess of 5.0 A.
- What are the protective features of the MC33167T?
The protective features include cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- What is the operating ambient temperature range of the MC33167T?
The operating ambient temperature range is from -40°C to +85°C.
- What is the power supply current in standby mode?
The power supply current in standby mode is reduced to 36 μA.
- What types of packages are available for the MC33167T?
The MC33167T is available in a 5-Lead TO-220 package and a surface mount D2PAK package.
- Does the MC33167T have ESD protection?
- What is the precision of the internal reference voltage?
- Can the MC33167T be used in step-up converter applications?
- What is the maximum power supply input voltage for the MC33167T?
