Overview
The LM5085-Q1, produced by Texas Instruments, is a high-efficiency PFET switching regulator controller designed to facilitate the development of small, efficient buck regulators. This controller operates over a wide input voltage range of 4.5-V to 75-V and is AEC-Q100 Grade 1 Qualified, making it suitable for automotive and other high-reliability applications. The LM5085-Q1 features a constant on-time regulation principle, which eliminates the need for loop compensation and results in ultra-fast load transient response.
Key Specifications
| Parameter | Value |
|---|---|
| Package | HVSSOP-8, VSSOP-8, WSON-8 |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 125 |
| Input Voltage Range | 4.5-V to 75-V |
| Switching Frequency | Up to 1 MHz |
| Output Voltage Range | Adjustable from 1.25 V |
| Feedback Reference Accuracy | ±2% |
| Duty Cycle Operation | Up to 100% |
Key Features
- AEC-Q100 Grade 1 Qualified for automotive applications
- Wide 4.5-V to 75-V input voltage range
- Adjustable current limit using RDS(ON) or a current sense resistor
- Programmable switching frequency up to 1 MHz
- No loop compensation required
- Ultra-fast transient response
- Nearly constant operating frequency with line and load variations
- Adjustable output voltage from 1.25 V
- Precision ±2% feedback reference
- Capable of 100% duty cycle operation
- Internal soft-start timer
- Integrated high voltage bias regulator
- Thermal shutdown
Applications
The LM5085-Q1 is suitable for a wide range of applications, including:
- Automotive systems requiring high reliability and efficiency
- Industrial power supplies where high input voltage and efficiency are crucial
- Telecommunications and networking equipment
- Medical devices requiring precise voltage regulation
- Other high-reliability applications where a robust and efficient buck regulator is needed
Q & A
- What is the input voltage range of the LM5085-Q1?
The input voltage range of the LM5085-Q1 is 4.5-V to 75-V.
- What is the maximum switching frequency of the LM5085-Q1?
The maximum switching frequency of the LM5085-Q1 is up to 1 MHz.
- Does the LM5085-Q1 require loop compensation?
No, the LM5085-Q1 does not require loop compensation due to its constant on-time regulation principle.
- What is the accuracy of the feedback reference in the LM5085-Q1?
The feedback reference accuracy of the LM5085-Q1 is ±2%.
- Can the LM5085-Q1 operate at 100% duty cycle?
Yes, the LM5085-Q1 is capable of 100% duty cycle operation.
- What types of packages are available for the LM5085-Q1?
The LM5085-Q1 is available in HVSSOP-8, VSSOP-8, and WSON-8 packages.
- What is the operating temperature range of the LM5085-Q1?
The operating temperature range of the LM5085-Q1 is -40°C to 125°C.
- How does the LM5085-Q1 handle over-current detection?
The LM5085-Q1 can use either the RDS(ON) of the PFET or an external sense resistor for over-current detection.
- Does the LM5085-Q1 have thermal shutdown protection?
Yes, the LM5085-Q1 includes thermal shutdown protection.
- What is the purpose of the internal soft-start timer in the LM5085-Q1?
The internal soft-start timer in the LM5085-Q1 helps to reduce inrush current during startup.
