Overview
The LMR33630ARNXR from Texas Instruments is a SIMPLE SWITCHER® synchronous step-down DC/DC converter designed for rugged industrial applications. This regulator delivers best-in-class efficiency and is capable of driving up to 3 A of load current from an input voltage of up to 36 V. It provides high light load efficiency and output accuracy in a very small solution size, making it ideal for a wide range of applications. The device features a power-good flag and precision enable, which offer flexible and easy-to-use solutions. The LMR33630 automatically folds back frequency at light load to improve efficiency and integrates most external components, simplifying PCB layout. It is available in both 8-pin HSOIC and 12-pin VQFN packages with wettable flanks, and an AEC-Q100-qualified version is also available for automotive applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3.8 V to 36 V | V |
| Output Voltage Range | 1 V to 24 V | V |
| Output Current | Up to 3 A | A |
| Switching Frequency | 400 kHz, 1.4 MHz, 2.1 MHz | Hz |
| Junction Temperature Range | –40°C to +125°C | °C |
| RDS-ON Power MOSFETs | 75-mΩ/50-mΩ | Ω |
| Minimum On-Time | 68 ns | ns |
| Peak Efficiency | > 95% | % |
| Quiescent Current | 25 µA | µA |
| Package Options | 8-pin HSOIC, 12-pin VQFN | - |
Key Features
- Peak-Current-Mode Control: Ensures stable and efficient operation.
- Low EMI and Switching Noise: Integrated compensation network and HotRod™ package reduce EMI and switching noise.
- High Power Conversion Efficiency: Peak efficiency greater than 95% at all loads.
- Flexible System Interface: Power-good flag and precision enable for flexible system integration.
- Protection Features: Thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection.
- Functional Safety-Capable: Documentation available to aid in functional safety system design.
- Auto Mode Operation: Automatically switches between PWM and PFM modes to optimize efficiency at different load conditions.
- Small Solution Size: Available in ultra-miniature VQFN package with wettable flanks.
Applications
- Motor Drive Systems: Drones, AC inverters, VF drives, servos.
- Factory and Building Automation Systems: PLC CPU, HVAC control, elevator control.
- General Purpose Wide VIN Powers: Suitable for various industrial applications requiring a wide input voltage range.
Q & A
- What is the input voltage range of the LMR33630?
The input voltage range is from 3.8 V to 36 V.
- What is the maximum output current of the LMR33630?
The maximum output current is up to 3 A.
- What are the available switching frequencies for the LMR33630?
The available switching frequencies are 400 kHz, 1.4 MHz, and 2.1 MHz.
- What is the junction temperature range of the LMR33630?
The junction temperature range is from –40°C to +125°C.
- Does the LMR33630 have built-in protection features?
Yes, it includes thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection.
- What packages are available for the LMR33630?
The device is available in 8-pin HSOIC and 12-pin VQFN packages with wettable flanks.
- Is the LMR33630 suitable for automotive applications?
Yes, an AEC-Q100-qualified version is available for automotive applications.
- How does the LMR33630 optimize efficiency at different load conditions?
The device automatically switches between PWM and PFM modes to optimize efficiency at different load conditions.
- What is the quiescent current of the LMR33630?
The quiescent current is 25 µA.
- Does the LMR33630 have a power-good flag and precision enable?
Yes, it features a power-good flag and precision enable for flexible system integration.
