Overview
The LMR33640ADDAR from Texas Instruments 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 and offers high efficiency, ease of use, and robust protection features. It is available in an 8-pin HSOIC package and is well-suited for scalable industrial power supplies. The LMR33640 provides high light-load efficiency and output accuracy, making it an ideal choice for a wide range of 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 |
| Peak Efficiency | > 95% | % |
| Shutdown Quiescent Current | 5 µA | A |
| Operating Quiescent Current | 24 µA | A |
| Package Type | 8-pin HSOIC |
Key Features
- Functional Safety-Capable with documentation available to aid in functional safety system design.
- Configured for rugged industrial applications with an input voltage range of 3.8 V to 36 V and an output voltage range of 1 V to 24 V.
- Peak-current mode control and high-efficiency solution with peak efficiency > 95%.
- Low shutdown quiescent current of 5 µA and low operating quiescent current of 24 µA.
- Flexible system interface with power-good flag and precision enable.
- Automatic frequency foldback at light load to improve efficiency.
- Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection.
- Internal compensation reduces the need for external components and simplifies PCB layout.
- Pin-to-pin compatible with other SIMPLE SWITCHER power supplies like LMR33610, LMR33620, LMR33630, LMR36510, and LMR36520.
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 systems.
- Industrial control systems.
- Automotive electronics.
- Battery-powered devices.
Q & A
- What is the input voltage range of the LMR33640ADDAR? The input voltage range is 3.8 V to 36 V.
- What is the maximum output current of the LMR33640ADDAR? The maximum output current is up to 4 A.
- What are the switching frequencies available for the LMR33640ADDAR? The switching frequencies are 400 kHz and 1 MHz.
- What is the peak efficiency of the LMR33640ADDAR? The peak efficiency is greater than 95%.
- What protection features does the LMR33640ADDAR include? It includes thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection.
- Is the LMR33640ADDAR pin-to-pin compatible with other devices? Yes, it is pin-to-pin compatible with devices like LMR33610, LMR33620, LMR33630, LMR36510, and LMR36520.
- What is the junction temperature range of the LMR33640ADDAR? The junction temperature range is –40°C to +125°C.
- How does the LMR33640ADDAR manage efficiency at light loads? It automatically folds back the frequency at light loads to improve efficiency.
- What is the purpose of the power-good flag in the LMR33640ADDAR? The power-good flag is used to indicate when the output voltage is within regulation and can reset a system microprocessor during fault conditions.
- Can the LMR33640ADDAR be used in scalable industrial power supplies? Yes, it is well-suited for scalable industrial power supplies.
