Overview
The MC34167TH, part of the MC34167 and MC33167 series, is a high-performance fixed frequency power switching regulator produced by ON Semiconductor. These monolithic devices are optimized for dc-to-dc converter applications and are designed to implement step-down, voltage-inverting, and step-up converters with a minimal number of external components. The MC34167TH 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. This device is particularly suited for applications in automotive, computer, industrial, and cost-sensitive consumer products due to its robust features and efficient operation.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Input Voltage | VCC | - | - | 40 | V |
| Switch Output Voltage Range | VO(switch) | -2.0 | - | + Vin | V |
| Oscillator Frequency (VCC = 7.5 V to 40 V) | fOSC | 65 | 72 | 81 | kHz |
| Voltage Feedback Input Threshold | VFB(th) | 4.85 | 5.05 | 5.20 | V |
| Thermal Resistance, Junction-to-Ambient | �JA | - | - | 70 | °C/W |
| Operating Junction Temperature | TJ | - | - | +150 | °C |
| Operating Ambient Temperature | TA | 0 | - | +70 | °C |
| Storage Temperature Range | Tstg | -65 | - | +150 | °C |
Key Features
- High Current Output Switch: Capable of switching up to 5.0 A.
- Fixed Frequency Oscillator: Internally programmed to 72 kHz with on-chip timing components.
- Pulse Width Modulator: Latching pulse width modulator for single pulse metering.
- Error Amplifier: High gain error amplifier for precise voltage regulation.
- Protective Features: Includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- Low Power Standby Mode: Reduces power supply current to 36 μA.
- ESD Protection: Exceeds Human Body Model 2000 V and Machine Model 200 V tests).
Applications
The MC34167TH is versatile and can be used in various applications, including:
- Automotive Systems: Suitable for the harsh environments and stringent requirements of automotive electronics).
- Computer Systems: Ideal for power supply units in computers and other electronic devices).
- Industrial Equipment: Used in industrial control systems, power supplies, and other industrial applications).
- Consumer Products: Cost-effective solution for consumer electronics requiring efficient power conversion).
Q & A
- What is the primary function of the MC34167TH?
The MC34167TH is a high-performance fixed frequency power switching regulator designed for dc-to-dc converter applications).
- What is the typical oscillator frequency of the MC34167TH?
The oscillator frequency is internally programmed to 72 kHz).
- What are the protective features of the MC34167TH?
The device includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown).
- What is the maximum output switch current of the MC34167TH?
The output switch can handle up to 5.0 A).
- What is the operating ambient temperature range for the MC34167TH?
The operating ambient temperature range is from 0°C to +70°C).
- Does the MC34167TH have ESD protection?
Yes, it exceeds Human Body Model 2000 V and Machine Model 200 V tests).
- What is the storage temperature range for the MC34167TH?
The storage temperature range is from -65°C to +150°C).
- Can the MC34167TH be used in step-up converter applications?
Yes, it can be used cost-effectively in step-up converter applications).
- What is the power supply current in standby mode?
The power supply current in standby mode is reduced to 36 μA).
- What are some typical applications of the MC34167TH?
Typical applications include automotive, computer, industrial, and cost-sensitive consumer products).
