Overview
The LM25085MYX/NOPB is a high-efficiency PFET switching regulator controller produced by Texas Instruments. This device is designed to quickly and easily develop small, efficient buck regulators for a wide range of applications. The LM25085 features a constant on-time regulation principle, which simplifies circuit implementation and results in ultra-fast load transient response. It operates over a wide input voltage range of 4.5V to 42V and includes a PFET gate driver and a high voltage bias regulator. The device is particularly useful in applications requiring high efficiency, fast transient response, and a simple design process.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VIN to GND | -0.3 | 45 | V | |
| ISEN to GND | -3 | VIN + 0.3 | V | |
| ADJ to GND | -0.3 | VIN + 0.3 | V | |
| RT, FB to GND | -0.3 | 7 | V | |
| VIN to VCC, VIN to PGATE | -0.3 | 10 | V | |
| Operating Current (Non-Switching, FB = 1.4V) | 1.25 | 1.75 | mA | |
| Shutdown Current (RT = 0V) | 175 | 300 | µA | |
| Soft-Start Time | 1.4 | 2.5 | 4.3 | ms |
| Junction Shutdown Temperature | 170 | °C | ||
| Junction Shutdown Hysteresis | 20 | °C | ||
| Operating Temperature Range | -40 | 125 | °C | |
| Storage Temperature Range | -65 | 150 | °C | |
| Package Type | HVSSOP (8), VSSOP (8), WSON (8) |
Key Features
- AEC-Q100 Grade 1 Qualified for automotive applications (-40°C to 125°C Operating Junction Temperature)
- Wide 4.5V to 42V 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 1.25V
- Precision ±2% Feedback Reference
- Capable of 100% Duty Cycle Operation
- Internal Soft-Start Timer
- Integrated High Voltage Bias Regulator
- Thermal Shutdown
Applications
- Automotive Infotainment Systems
- Battery/Super Capacitor Chargers
- LED Drivers
Q & A
- What is the input voltage range of the LM25085? The input voltage range is 4.5V to 42V.
- What is the maximum operating junction temperature for the LM25085-Q1? The maximum operating junction temperature is 125°C.
- Does the LM25085 require loop compensation? No, the LM25085 does not require loop compensation due to its constant on-time regulation principle.
- What is the maximum switching frequency of the LM25085? The switching frequency can be programmed up to 1MHz.
- Can the LM25085 operate at 100% duty cycle? Yes, the LM25085 is capable of 100% duty cycle operation.
- How is the output voltage adjusted in the LM25085? The output voltage is adjusted using feedback resistors (RFB1 and RFB2).
- What is the purpose of the internal soft-start timer in the LM25085? The internal soft-start timer helps in gradually increasing the output voltage during startup to prevent inrush current.
- What type of thermal protection does the LM25085 have? The LM25085 features thermal shutdown with a junction shutdown temperature of 170°C.
- What are the common applications of the LM25085? Common applications include automotive infotainment systems, battery/super capacitor chargers, and LED drivers.
- What are the available package types for the LM25085? The available package types are HVSSOP (8), VSSOP (8), and WSON (8).
