Overview
The MC33166TG, part of the MC33166 series, is a high-performance fixed frequency power switching regulator produced by onsemi. These devices are designed for dc-to-dc converter applications and are optimized for step-down and voltage-inverting configurations with a minimal number of external components. They can also be used cost-effectively in step-up applications. The MC33166TG integrates all the active functions necessary 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 |
| Oscillator Frequency | fOSC | 65 | 72 | 79 | kHz |
| Output Switch Current | Ipk(switch) | 3.3 | 4.3 | 6.0 | A |
| Operating Junction Temperature | TJ | - | - | 150 | °C |
| Operating Ambient Temperature | TA | -40 | - | 85 | °C |
| Storage Temperature Range | Tstg | -65 | - | 150 | °C |
| Thermal Resistance, Junction-to-Ambient | θJA | - | - | 70 | °C/W |
| Thermal Resistance, Junction-to-Case | θJC | - | - | 5.0 | °C/W |
Key Features
- High-performance fixed frequency power switching regulator.
- Internal temperature-compensated reference with a precision 2% output voltage.
- Fixed frequency oscillator at 72 kHz with on-chip timing components.
- High gain error amplifier with access to the inverting input and output.
- High current output switch capable of sourcing up to 3.0 A.
- Cycle-by-cycle current limiting for output switch protection.
- Undervoltage lockout and thermal shutdown for enhanced reliability.
- Low power standby mode reducing power supply current to 36 μA.
- Support for step-down, voltage-inverting, and step-up configurations.
Applications
The MC33166TG is suitable for a variety of dc-to-dc converter applications, including:
- Step-down converters: Efficiently reducing input voltage to a lower output voltage.
- Voltage-inverting converters: Generating negative output voltages from a positive input voltage.
- Step-up converters: Boosting input voltage to a higher output voltage.
- Power supplies in industrial, automotive, and consumer electronics.
- Battery-powered devices requiring efficient voltage regulation.
Q & A
- What is the typical operating frequency of the MC33166TG?
The typical operating frequency is 72 kHz.
- What is the maximum output switch current of the MC33166TG?
The maximum output switch current is in excess of 3.0 A.
- What protective features are included in the MC33166TG?
The device includes cycle-by-cycle current limiting, undervoltage lockout, and thermal shutdown.
- What is the precision of the internal temperature-compensated reference?
The internal reference has a precision of 2%.
- What is the operating ambient temperature range for the MC33166TG?
The operating ambient temperature range is from -40°C to +85°C.
- Can the MC33166TG be used in step-up converter configurations?
- What is the thermal shutdown temperature for the MC33166TG?
The thermal shutdown typically occurs at 170°C.
- How does the cycle-by-cycle current limiting work in the MC33166TG?
The cycle-by-cycle current limiting monitors the output switch transistor current during each on-cycle and turns off the switch if an overcurrent condition is detected.
- What is the power supply current in standby mode for the MC33166TG?
The power supply current in standby mode is reduced to 36 μA.
- What type of package is the MC33166TG available in?
The MC33166TG is available in a D2PAK surface mount package.
