Overview
The MC33166TVG is a high-performance fixed frequency power switching regulator produced by onsemi. This device is part of the MC33166 series, designed for dc-to-dc converter applications, particularly in step-down and voltage-inverting configurations. It can also be used effectively in step-up applications with a minimal number of external components. The MC33166TVG integrates all the necessary active functions for direct implementation of these converters, including an internal temperature-compensated reference, a fixed frequency oscillator, a high gain error amplifier, and a high current output switch.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Input Voltage | VCC | 40 | V | ||
| Switch Output Voltage Range | VO(switch) | -1.5 | + Vin | V | |
| Output Switch Current | 3.0 | A | |||
| Fixed Frequency Oscillator | fOSC | 65 | 72 | 79 | kHz |
| Voltage Feedback Input Threshold | VFB(th) | 4.95 | 5.05 | 5.15 | V |
| Output Duty Cycle | DC | 0 | 95 | % | |
| Current Limit Threshold | Ipk(switch) | 3.3 | 4.3 | 6.0 | A |
| Operating Junction Temperature | TJ | 150 | °C | ||
| Operating Ambient Temperature | TA | -40 | 85 | °C |
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, undervoltage lockout, and thermal shutdown for protection.
- Low power standby mode reducing power supply current to 36 μA.
- Supports step-down, voltage-inverting, and step-up configurations with minimal external components.
- Precision 2% reference voltage.
- Output duty cycle range of 0% to 95%.
Applications
- Dc-to-dc converter applications in various power supply systems.
- Step-down and voltage-inverting configurations.
- Step-up applications with external power MOSFETs.
- Power supplies for industrial, automotive, and consumer electronics.
- Battery-powered devices requiring efficient power management.
Q & A
- What is the maximum output switch current of the MC33166TVG?
The maximum output switch current is in excess of 3.0 A.
- What is the operating frequency of the oscillator in the MC33166TVG?
The oscillator operates at a fixed frequency of 72 kHz (typical), with a range of 65 kHz to 79 kHz.
- What are the key protective features of the MC33166TVG?
The device includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- What is the typical power supply current in standby mode?
The power supply current in standby mode is 36 μA.
- What is the precision of the internal reference voltage?
The internal reference voltage has a precision of 2%.
- What is the range of the output duty cycle?
The output duty cycle can range from 0% to 95%.
- What are the typical operating ambient temperature ranges for the MC33166TVG?
The operating ambient temperature range is from -40°C to +85°C.
- How does the device protect against overcurrent conditions?
The device uses cycle-by-cycle current limiting to protect the output switch transistor from overstress.
- What is the purpose of the thermal shutdown feature?
The thermal shutdown feature protects the integrated circuit by disabling the output switch when the maximum junction temperature is exceeded.
- Can the MC33166TVG be used in step-up configurations?
