Overview
The MC34167D2TR4G 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 operates as a voltage mode regulator, incorporating all the necessary active functions to implement step-down, voltage-inverting, and step-up converters with a minimal number of external components. The device is optimized 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 |
| Voltage Feedback Input Threshold | VFB(th) | 4.95 | 5.05 | 5.15 | V |
| Output Voltage Swing High State | VOH | 4.2 | 4.5 | 4.9 | V |
| Output Voltage Swing Low State | VOL | 1.6 | 1.7 | 1.9 | 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 | 0 | 70 | °C | |
| Storage Temperature Range | Tstg | -65 | 150 | °C |
Key Features
- Internal temperature compensated reference and fixed frequency oscillator with on-chip timing components.
- Latching pulse width modulator for single pulse metering.
- High gain error amplifier and high current output switch.
- Protective features include cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- Low power standby mode reducing power supply current to 36 μA.
- Supports step-down, voltage-inverting, and step-up converter configurations.
- ESD protection exceeding Human Body Model 2000 V and Machine Model 200 V tests.
- Soft-start capability using the error amplifier output.
Applications
The MC34167D2TR4G is suitable for a variety of 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 regulated outputs
Q & A
- What is the maximum input voltage for the MC34167D2TR4G?
The maximum input voltage is 40 V.
- What is the typical oscillator frequency of the MC34167D2TR4G?
The typical oscillator frequency is 72 kHz.
- What are the protective features of the MC34167D2TR4G?
The protective features include cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- How does the low power standby mode function?
The low power standby mode reduces the power supply current to 36 μA by clamping the voltage on the error amplifier output.
- What is the maximum operating junction temperature for the MC34167D2TR4G?
The maximum operating junction temperature is 150°C.
- Can the MC34167D2TR4G be used in step-up converter applications?
- What is the purpose of the soft-start feature in the MC34167D2TR4G?
The soft-start feature helps in gradually increasing the output voltage to prevent inrush currents and voltage spikes during startup.
- How does the device protect against ESD?
The device includes ESD protection exceeding Human Body Model 2000 V and Machine Model 200 V tests.
- What are the recommended design considerations for using the MC34167D2TR4G?
Special care should be taken to separate ground paths from signal currents and load currents, and all high current loops should be kept as short as possible using heavy copper runs.
- Can the MC34167D2TR4G be used in off-line applications?
