Overview
The MC33167D2TR4G 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, voltage-inverting, and step-up configurations with a minimal number of external components. The MC33167 series operates over a temperature range of -40°C to +85°C, making it suitable for various applications including automotive, computer, industrial, and cost-sensitive consumer products.
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 | fOSC | 65 | 72 | 79 | kHz |
| Error Amplifier Voltage Feedback Input Threshold | VFB(th) | 4.85 | 5.05 | 5.20 | V |
| Switch Output Current Limit Threshold | Ipk(switch) | 5.5 | 6.5 | 8.0 | A |
| Operating Junction Temperature | TJ | +150 | °C | ||
| Operating Ambient Temperature | TA | -40 | +85 | °C | |
| Thermal Resistance, Junction-to-Ambient | θJA | 70 | °C/W | ||
| Thermal Resistance, Junction-to-Case | θJC | 5.0 | °C/W |
Key Features
- Fixed frequency oscillator with on-chip timing components, internally programmed to 72 kHz.
- Pulse Width Modulator (PWM) with a comparator and latch to prevent multiple output pulses during a given oscillator clock cycle.
- High gain error amplifier with a 100 μA current source pull-up for soft-start implementation.
- High current output switch capable of handling up to 5.5 A peak collector current.
- Protective features including 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.
Applications
The MC33167D2TR4G is versatile and can be used in various applications such as:
- Automotive systems requiring robust and efficient power conversion.
- Computer and industrial power supplies where reliability and efficiency are crucial.
- Cost-sensitive consumer products that need efficient dc-to-dc conversion.
- Step-down, voltage-inverting, and step-up converter configurations.
- Off-line applications with preconverters to handle AC line voltage conversion.
- Distributed power systems requiring multiple independently regulated outputs.
Q & A
- What is the maximum input voltage for the MC33167D2TR4G?
The maximum input voltage is 40 V.
- What is the operating temperature range for the MC33167D2TR4G?
The operating temperature range is -40°C to +85°C.
- What is the typical oscillator frequency of the MC33167D2TR4G?
The typical oscillator frequency is 72 kHz.
- What protective features are included in the MC33167D2TR4G?
The device includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- How does the low power standby mode function in the MC33167D2TR4G?
The low power standby mode reduces the power supply current to 36 μA by clamping the voltage on the error amplifier output to less than 150 mV.
- What is the maximum peak collector current of the output switch?
The maximum peak collector current is 5.5 A.
- What type of ESD protection does the MC33167D2TR4G have?
The device exceeds Human Body Model 2000 V and Machine Model 200 V tests.
- Can the MC33167D2TR4G be used in step-up converter applications?
Yes, it can be used cost-effectively in step-up converter applications.
- What is the thermal resistance, junction-to-ambient, for the D2PAK package?
The thermal resistance, junction-to-ambient, is 70 °C/W.
- How should the component layout be designed for best operation?
A tight component layout is recommended with all high current loops kept as short as possible using heavy copper runs to minimize ringing and radiated EMI.
