Overview
The Texas Instruments LMR33640DDDAR is a SIMPLE SWITCHER® 3.8-V to 36-V, 4-A synchronous step-down DC/DC converter. This device is designed for rugged industrial applications, offering high efficiency and ease of use. It is available in an 8-pin HSOIC package and is part of the family of scalable SIMPLE SWITCHER power supplies. The LMR33640 drives up to 4 A of load current from an input of up to 36 V and provides an output voltage range of 1 V to 24 V. It features peak-current mode control, high light-load efficiency, and output accuracy, making it suitable for a wide range of industrial power supply 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 4 A | A |
| Switching Frequency | 400 kHz or 1 MHz | Hz |
| Junction Temperature Range | –40°C to +125°C | °C |
| Package Type | 8-pin HSOIC | |
| Peak Efficiency | > 95% | % |
| Shutdown Quiescent Current | 5 µA | µA |
| Operating Quiescent Current | 24 µA | µA |
Key Features
- Functional Safety-Capable: Documentation available to aid functional safety system design.
- High-Efficiency Solution: Peak efficiency > 95% and high light-load efficiency.
- Low Quiescent Current: Low shutdown quiescent current of 5 µA and low operating quiescent current of 24 µA.
- Flexible System Interface: Power-good flag and precision enable.
- Protection Features: Thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection.
- Integrated Compensation: Reduces the need for external components and simplifies PCB layout.
- Pin Compatibility: Compatible with LMR33610, LMR33620, LMR33630, LMR36510, and LMR36520, minimizing board layout modifications.
Applications
- Motor Drive Systems: Drones, AC inverters, VF drives, servos.
- Factory and Building Automation Systems: PLC, HMI, HVAC systems, elevator main control panel.
- Wide VIN DC/DC Power Supply: Suitable for various industrial power supply needs.
Q & A
- What is the input voltage range of the LMR33640? The input voltage range is 3.8 V to 36 V.
- What is the output voltage range of the LMR33640? The output voltage range is 1 V to 24 V.
- What is the maximum output current of the LMR33640? The maximum output current is up to 4 A.
- What are the switching frequencies available for the LMR33640? The switching frequencies are 400 kHz and 1 MHz.
- What is the junction temperature range of the LMR33640? The junction temperature range is –40°C to +125°C.
- What package type is the LMR33640 available in? The LMR33640 is available in an 8-pin HSOIC package.
- What is the peak efficiency of the LMR33640? The peak efficiency is greater than 95%.
- What are the quiescent current values for the LMR33640? The shutdown quiescent current is 5 µA, and the operating quiescent current is 24 µA.
- What protection features does the LMR33640 have? The protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection.
- Is the LMR33640 pin-compatible with other SIMPLE SWITCHER regulators? Yes, it is pin-compatible with LMR33610, LMR33620, LMR33630, LMR36510, and LMR36520.
