Overview
The MC34167TG is a high-performance, fixed-frequency power switching regulator produced by onsemi. This device is part of the MC34167 and MC33167 series, designed for dc-to-dc converter applications. It is optimized for step-down and voltage-inverting configurations with a minimal number of external components and can also be used in step-up applications. The regulator features 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. It includes protective features such as cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown, along with a low-power standby mode to reduce power supply current.
Key Specifications
| Specification | Value | Unit |
|---|---|---|
| Output Current | 5 | A |
| Input Voltage - Max | 40 | V |
| Switching Frequency | 72 kHz | - |
| Operating Junction Temperature | -150 | °C |
| Operating Ambient Temperature | 0 to +70 | °C |
| Storage Temperature Range | -65 to +150 | °C |
| Thermal Resistance, Junction-to-Ambient | 65 (TO-220), 70 (D2PAK) | °C/W |
| Thermal Resistance, Junction-to-Case | 5.0 | °C/W |
| Power Supply Current (Standby) | 36 | μA |
| Power Supply Current (Operating) | 40 to 100 | mA |
Key Features
- Internal temperature-compensated reference and fixed-frequency oscillator
- Latching pulse width modulator for single pulse metering
- High-gain error amplifier and high-current output switch
- Protective features: cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown
- Low-power standby mode reducing power supply current to 36 μA
- ESD protection exceeding Human Body Model 2000 V and Machine Model 200 V tests
- Support for step-down, voltage-inverting, and step-up converter applications
- Soft-start capability through the error amplifier output
Applications
The MC34167TG is suitable for various applications including:
- Automotive systems
- Computer and industrial power supplies
- Cost-sensitive consumer products
- Off-line preconverter circuits for AC line voltage conversion
- Distributed power systems requiring multiple independently regulated outputs
Q & A
- What is the maximum output current of the MC34167TG?
The maximum output current is 5 A.
- What is the maximum input voltage for the MC34167TG?
The maximum input voltage is 40 V.
- What is the switching frequency of the MC34167TG?
The switching frequency is 72 kHz.
- What are the operating temperature ranges for the MC34167TG?
The operating ambient temperature range is 0 to +70°C, and the operating junction temperature is up to +150°C.
- What protective features does the MC34167TG include?
The device includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- How does the low-power standby mode work?
The low-power standby mode reduces the power supply current to 36 μA by clamping the error amplifier output voltage to less than 150 mV.
- What types of ESD protection does the MC34167TG have?
The device exceeds Human Body Model 2000 V and Machine Model 200 V tests.
- In what configurations can the MC34167TG be used?
The device can be used in step-down, voltage-inverting, and step-up converter configurations.
- What is the thermal resistance of the MC34167TG in TO-220 and D2PAK packages?
The thermal resistance is 65°C/W for TO-220 and 70°C/W for D2PAK packages.
- Can the MC34167TG be used in off-line applications?
Yes, it can be used in off-line applications, such as converting AC line voltage down to a lower DC voltage.
