Overview
The LM61440AASQRJRRQ1 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 input surges, 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 LM61440AASQRJRRQ1 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 system design.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN1, VIN2 to AGND, PGND) | -0.3 | 42 | V | |
| Output Current | 4 | A | ||
| Output Voltage Range | 1 | 95% of VIN | V | |
| Switching Frequency Range | 200 kHz | 2.2 MHz | ||
| Junction Temperature Range | -40 | 150 | °C | |
| High-Side MOSFET On-Resistance (RDS(ON)_HS) | 41 | 82 | mΩ | |
| No Load Current (Typical at 13.5 VIN, 3.3 VOUT) | 7 | μA | ||
| Efficiency at Light Load (PFM Mode at 1 mA, 13.5 VIN, 5 VOUT) | 83% |
Key Features
- Optimized for ultra-low EMI requirements with features such as 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 external bias option for improved efficiency.
- Seamless transition between PWM and PFM modes, ensuring high light load efficiency.
- Functional safety-capable with documentation available to aid in system design.
- Pin compatible with other models like LM61460-Q1 and LM61435-Q1.
- Soft recovery from dropout, eliminating overshoot on the output.
Applications
- Automotive infotainment and cluster systems: head unit, media hub, USB charge, display.
- Automotive ADAS (Advanced Driver Assistance Systems) and body electronics.
Q & A
- What is the input voltage range of the LM61440AASQRJRRQ1?
The input voltage range is from 3.0 V to 36 V, with a tolerance for 42 V input surges.
- What is the maximum output current of the LM61440AASQRJRRQ1?
The maximum output current is up to 4 A.
- What are the key features for EMI reduction in the LM61440AASQRJRRQ1?
The device features spread spectrum, adjustable SW node rise time, and a low-EMI VQFN-HR package to minimize EMI.
- Is the LM61440AASQRJRRQ1 qualified for automotive use?
Yes, it is AEC-Q100 qualified with a temperature grade 1 rating.
- What are the typical applications of the LM61440AASQRJRRQ1?
It is used in automotive infotainment and cluster systems, as well as in ADAS and body electronics.
- How does the LM61440AASQRJRRQ1 handle light load efficiency?
The device features seamless transition between PWM and PFM modes, ensuring high light load efficiency.
- What is the junction temperature range of the LM61440AASQRJRRQ1?
The junction temperature range is from -40°C to 150°C.
- Does the LM61440AASQRJRRQ1 support functional safety?
Yes, it is functional safety-capable with available documentation to aid in system design.
- How does the LM61440AASQRJRRQ1 manage output voltage regulation?
The device has ±1% total output regulation accuracy and supports output voltage adjustment from 1 V to 95% of VIN.
- What is the no-load current consumption of the LM61440AASQRJRRQ1?
The no-load current consumption is typically 7 μA at 13.5 VIN and 3.3 VOUT.
