Overview
The MC34166THG is a high-performance fixed frequency power switching regulator manufactured by ON Semiconductor. This device is part of the MC34166 and MC33166 series, which are designed for dc-to-dc converter applications. The MC34166THG is optimized for step-down and voltage-inverting configurations, requiring a minimum number of external components. It can also be used cost-effectively in step-up applications. The regulator includes an internal temperature-compensated reference, a fixed frequency oscillator, a high gain error amplifier, and a high current output switch.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Supply Input Voltage (VCC) | 40 | V |
| Switch Output Voltage Range (VO(switch)) | −1.5 to + Vin | V |
| Output Switch Current | 3.0 A | A |
| Fixed Frequency Oscillator | 72 kHz | kHz |
| Precision Reference Voltage | 5.05 V ± 2% | V |
| Output Duty Cycle | 0% to 95% | % |
| Current Limit Threshold | 3.3 to 6.0 A | A |
| Operating Junction Temperature (TJ) | 0 to +150 °C | °C |
| Operating Ambient Temperature (TA) | 0 to +70 °C | °C |
| Thermal Shutdown Temperature | Typically 170 °C | °C |
| Package Type | D2PAK - Surface Mount (Pb-Free) |
Key Features
- High-performance fixed frequency power switching regulator.
- 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 and thermal shutdown for protection.
- Undervoltage lockout with hysteresis to prevent erratic output switching.
- Low power standby mode reducing power supply current to 36 µA.
- Supports step-down, voltage-inverting, and step-up configurations with minimal external components.
Applications
- Dc-to-dc converter applications, including step-down, voltage-inverting, and step-up configurations.
- Power supply systems requiring high efficiency and reliability.
- Industrial and automotive power management systems.
- Telecommunication and networking equipment.
- Consumer electronics and embedded systems.
Q & A
- What is the maximum input voltage for the MC34166THG?
The maximum input voltage for the MC34166THG is 40 V.
- What is the typical output switch current of the MC34166THG?
The typical output switch current is 3.0 A.
- What is the frequency of the fixed frequency oscillator in the MC34166THG?
The frequency of the fixed frequency oscillator is 72 kHz.
- What is the precision of the internal reference voltage?
The internal reference voltage is 5.05 V with a precision of ±2%.
- What protective features are included in the MC34166THG?
The device includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- What is the operating junction temperature range for the MC34166THG?
The operating junction temperature range is 0 to +150 °C.
- What is the thermal shutdown temperature of the MC34166THG?
The thermal shutdown temperature is typically 170 °C.
- What type of package is the MC34166THG available in?
The MC34166THG is available in a D2PAK - Surface Mount (Pb-Free) package.
- Can the MC34166THG be used in step-up configurations?
- What is the power supply current in standby mode?
The power supply current in standby mode is reduced to 36 µA.
