Overview
The LM61440AFSQRJRRQ1 is an automotive-focused, high-performance DC-DC synchronous step-down converter produced by Texas Instruments. This device is designed to operate over a wide input voltage range of 3.0 V to 36 V, with a tolerance for 42 V, making it suitable for various automotive applications. It features integrated high-side and low-side MOSFETs, delivering up to 4 A of output current. The LM61440AFSQRJRRQ1 is AEC-Q100 qualified with a temperature grade 1 rating, operating from –40°C to 150°C, and is functional safety-capable with documentation available to aid in functional safety system design.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 3.0 | - | 36 | V |
| Output Current | - | - | 4 | A |
| Output Voltage Range | 1 | - | 95% of VIN | V |
| Switching Frequency Range | 200 kHz | - | 2.2 MHz | - |
| No Load Current | - | 7 μA | - | - |
| High-Side MOSFET On-Resistance | 41 | 82 | - | mΩ |
| Thermal Shutdown Rising Threshold | 158 | 168 | 180 | °C |
| Package Type | - | - | VQFN-HR (14 pins) | - |
| Package Size | - | - | 4.00 mm × 3.50 mm | - |
Key Features
- Optimized for ultra-low EMI requirements with features like spread spectrum, adjustable SW node rise time, and a low-EMI VQFN-HR package.
- Supports 42-V automotive load dump and has ±1% total output regulation accuracy.
- High efficiency power conversion at all loads, with 83% PFM efficiency at 1 mA load and 7 μA no-load current.
- External bias option for improved efficiency and seamless transition between PWM and PFM modes.
- Functional safety-capable with documentation available to aid in functional safety system design.
- Pin compatible with other models like LM61460-Q1 and LM61435-Q1 for scalable power supplies.
- Soft recovery from dropout, eliminating overshoot on the output.
Applications
- Automotive infotainment and cluster systems: head units, media hubs, USB charging, and displays.
- Automotive ADAS (Advanced Driver Assistance Systems) and body electronics.
Q & A
- What is the input voltage range of the LM61440AFSQRJRRQ1?
The input voltage range is from 3.0 V to 36 V, with a tolerance for 42 V.
- What is the maximum output current of the LM61440AFSQRJRRQ1?
The maximum output current is up to 4 A.
- What are the key features for EMI reduction in the LM61440AFSQRJRRQ1?
The device features spread spectrum, adjustable SW node rise time, and a low-EMI VQFN-HR package to minimize EMI.
- Is the LM61440AFSQRJRRQ1 qualified for automotive use?
Yes, it is AEC-Q100 qualified with a temperature grade 1 rating, operating from –40°C to 150°C.
- What is the typical no-load current of the LM61440AFSQRJRRQ1?
The typical no-load current is 7 μA.
- Can the switching frequency be adjusted or synchronized?
Yes, the switching frequency can be set or synchronized between 200 kHz and 2.2 MHz.
- What is the package type and size of the LM61440AFSQRJRRQ1?
The device is packaged in a 14-pin VQFN-HR package with dimensions of 4.00 mm × 3.50 mm.
- Does the LM61440AFSQRJRRQ1 support functional safety?
Yes, it is functional safety-capable with available documentation to aid in functional safety system design.
- What are some typical applications for the LM61440AFSQRJRRQ1?
Typical applications include automotive infotainment and cluster systems, and automotive ADAS and body electronics.
- How does the LM61440AFSQRJRRQ1 handle thermal shutdown?
The device has a thermal shutdown rising threshold of 158°C to 180°C with a hysteresis of 10°C.
