Overview
The LM5085QMY/NOPB is a high-efficiency PFET switching regulator controller produced by Texas Instruments. This controller is designed to facilitate the development of small, efficient buck regulators for a wide range of applications. It features a PFET gate driver and a high voltage bias regulator, operating over a broad input voltage range of 4.5V to 75V. The constant on-time regulation principle eliminates the need for loop compensation, resulting in ultra-fast load transient response and a nearly constant operating frequency despite line and load variations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 4.5 to 75 | V |
| Operating Junction Temperature | -40 to 125 | °C |
| Package Types | HVSSOP-8, VSSOP-8, WSON-8 | |
| Maximum Switching Frequency | 1 MHz | |
| Output Voltage Adjustment Range | 1.25 V and above | V |
| Feedback Reference Accuracy | ±2% | |
| Duty Cycle Capability | 100% | |
| Thermal Shutdown | Yes | |
| Junction-to-Ambient Thermal Resistance (θJA) | 153 °C/W (HVSSOP-8) | °C/W |
Key Features
- AEC-Q100 Grade 1 Qualified for automotive applications, operating from -40°C to 125°C.
- Wide input voltage range of 4.5V to 75V.
- Adjustable current limit using RDS(ON) or a current sense resistor.
- Programmable switching frequency up to 1 MHz.
- No loop compensation required due to constant on-time regulation.
- Ultra-fast transient response and nearly constant operating frequency with line and load variations.
- Adjustable output voltage from 1.25 V with ±2% feedback reference accuracy.
- Capable of 100% duty cycle operation for low dropout voltage.
- Internal soft-start timer and integrated high voltage bias regulator.
- Thermal shutdown for overtemperature protection.
Applications
- Automotive infotainment systems.
- Battery and super capacitor chargers.
- LED drivers.
- General-purpose DC-DC conversion in industrial and consumer electronics.
Q & A
- What is the input voltage range of the LM5085QMY/NOPB?
The input voltage range is 4.5V to 75V.
- What are the package options available for the LM5085QMY/NOPB?
The available packages are HVSSOP-8, VSSOP-8, and WSON-8.
- Does the LM5085QMY/NOPB require loop compensation?
No, it does not require loop compensation due to its constant on-time regulation principle.
- What is the maximum switching frequency of the LM5085QMY/NOPB?
The maximum switching frequency is up to 1 MHz.
- Is the LM5085QMY/NOPB suitable for automotive applications?
Yes, it is AEC-Q100 Grade 1 Qualified for automotive applications, operating from -40°C to 125°C.
- What is the duty cycle capability of the LM5085QMY/NOPB?
The LM5085QMY/NOPB is capable of 100% duty cycle operation.
- Does the LM5085QMY/NOPB have thermal shutdown protection?
Yes, it includes thermal shutdown protection.
- How does the LM5085QMY/NOPB adjust the output voltage?
The output voltage can be adjusted from 1.25 V with a ±2% feedback reference accuracy.
- What is the significance of the internal soft-start timer in the LM5085QMY/NOPB?
The internal soft-start timer helps in reducing inrush current during startup, ensuring a smooth and controlled power-up sequence.
- What are some typical applications of the LM5085QMY/NOPB?
Typical applications include automotive infotainment, battery and super capacitor chargers, LED drivers, and general-purpose DC-DC conversion.
