Overview
The LM5085MME/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, simplifying circuit implementation and ensuring ultra-fast load transient response. The controller supports 100% duty cycle operation, which is beneficial for low dropout voltage applications.
Key Specifications
| Parameter | Value |
|---|---|
| Control Mode | Constant on-time (COT) |
| Duty Cycle (Max), % | 100 |
| Iout (Max), A | 10 |
| Iq (Typ), mA | 1.3 |
| Number of Phases | 1 |
| Operating Temperature Range, °C | -40 to 125 |
| Package Type | VSSOP-8 |
| Switching Frequency (Max), kHz | 1000 |
| Switching Frequency (Min), kHz | 50 |
| Vin (Max), V | 75 |
| Vin (Min), V | 4.5 |
| Vout (Max), V | 75 |
| Vout (Min), V | 1.25 |
Key Features
- AEC-Q100 Grade 1 Qualified for automotive applications (–40°C to 125°C Operating Junction Temperature)
- 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 1MHz
- 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 LM5085MME/NOPB is suitable for a variety of applications, including:
- Automotive systems: Given its AEC-Q100 Grade 1 qualification, it is ideal for automotive applications requiring high reliability and temperature stability.
- Industrial power supplies: The wide input voltage range and high efficiency make it suitable for industrial power supply designs.
- Constant Current Constant Voltage (CC/CV) converters: It can be used in CC/CV converters as described in the application notes provided by Texas Instruments.
- Buck-Boost (Zeta) converters: The controller can be used in designing non-invert buck-boost converters.
- General-purpose buck regulators: Its features make it a versatile choice for various buck regulator applications.
Q & A
- What is the input voltage range of the LM5085MME/NOPB?
The input voltage range is from 4.5V to 75V.
- What is the maximum output voltage of the LM5085MME/NOPB?
The maximum output voltage is 75V.
- Does the LM5085MME/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 LM5085MME/NOPB?
The maximum switching frequency is up to 1MHz.
- Is the LM5085MME/NOPB suitable for automotive applications?
- What is the duty cycle capability of the LM5085MME/NOPB?
- How does the LM5085MME/NOPB handle thermal issues?
- What types of packages are available for the LM5085MME/NOPB?
- Can the LM5085MME/NOPB be used in constant current constant voltage (CC/CV) applications?
- What is the typical quiescent current (Iq) of the LM5085MME/NOPB?
