Overview
The MC34166TG, produced by onsemi, is a high-performance fixed frequency power switching regulator. This device is part of the MC34166 and MC33166 series, designed for dc-to-dc converter applications. It is optimized for step-down and voltage-inverting configurations, requiring a minimum number of external components. The MC34166TG can also be used cost-effectively in step-up applications. The device features an internal temperature-compensated reference, a fixed frequency oscillator, a high gain error amplifier, and a high current output switch, along with protective features such as cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
Key Specifications
| Characteristic | Value | Unit |
|---|---|---|
| Power Supply Input Voltage (VCC) | 40 | V |
| Switch Output Voltage Range (VO(switch)) | −1.5 to + Vin | V |
| Operating Junction Temperature (TJ) | −40 to +150 | °C |
| Operating Ambient Temperature (TA) | 0 to +70 | °C |
| Storage Temperature Range (Tstg) | −65 to +150 | °C |
| Output Switch Current | 3.0 A | A |
| Fixed Frequency Oscillator | 72 kHz | kHz |
| Voltage Feedback Input Threshold (VFB(th)) | 4.95 to 5.05 V | V |
| Current Limit Threshold (Ipk(switch)) | 3.3 to 6.0 A | A |
| Thermal Resistance, Junction-to-Ambient (θJA) | 65 to 70 °C/W | °C/W |
| Power Supply Current (ICC) - Standby | 36 μA | μA |
| Power Supply Current (ICC) - Operating | 31 to 100 mA | mA |
Key Features
- Internal temperature-compensated reference and fixed frequency oscillator with on-chip timing components.
- High gain error amplifier and high current output switch.
- Cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown for protection.
- Low power standby mode reducing power supply current to 36 μA.
- Precision 2% reference voltage.
- Output duty cycle range of 0% to 95%.
- High efficiency with up to 83.3% efficiency in certain configurations.
Applications
The MC34166TG is suitable for a variety of dc-to-dc converter applications, including step-down, voltage-inverting, and step-up configurations. It is particularly useful in systems requiring high efficiency and minimal external components. Common applications include power supplies for industrial, automotive, and consumer electronics, as well as in telecommunications and medical devices.
Q & A
- What is the maximum input voltage for the MC34166TG?
The maximum input voltage (VCC) is 40 V. - What is the typical output switch current of the MC34166TG?
The typical output switch current is 3.0 A. - What is the operating temperature range for the MC34166TG?
The operating ambient temperature range is 0 to +70°C. - What protective features does the MC34166TG have?
The device includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown. - What is the frequency of the fixed frequency oscillator?
The fixed frequency oscillator operates at 72 kHz. - What is the precision of the internal reference voltage?
The internal reference voltage has a precision of 2%. - What is the typical standby current of the MC34166TG?
The typical standby current is 36 μA. - Can the MC34166TG be used in step-up applications?
Yes, the MC34166TG can be used cost-effectively in step-up applications. - What is the thermal shutdown temperature for the MC34166TG?
The thermal shutdown typically occurs at 170°C. - What is the maximum junction temperature for the MC34166TG?
The maximum junction temperature is 150°C.
