Overview
The LM43600PWPR from Texas Instruments is a high-efficiency synchronous step-down DC-DC converter designed to drive up to 0.5 A of load current from an input voltage ranging from 3.5 V to 36 V (with a transient tolerance of 42 V). This device is part of a family that includes 1-A, 2-A, and 3-A load current options in pin-to-pin compatible packages. The LM43600 offers exceptional efficiency, output accuracy, and a low dropout voltage, making it suitable for a wide range of applications. It features a small solution size and requires few external components, simplifying the PCB layout.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Voltage (VIN to PGND) | -0.3 | - | 42 | V |
| Output Current | - | - | 0.5 | A |
| Switching Frequency | 200 kHz | 500 kHz | 2.2 MHz | - |
| Feedback Voltage (VFB) | 0.999 | 1.016 | 1.031 | V |
| Quiescent Current | - | 33 µA | - | - |
| Junction-to-Ambient Thermal Resistance (RθJA) | - | - | 39.9 | °C/W |
| Operating Junction Temperature (TJ) | -40 | - | 125 | °C |
Key Features
- High Efficiency at Light Load (DCM and PFM)
- Meets EN55022/CISPR 22 EMI standards
- Integrated Synchronous Rectification
- Adjustable Frequency Range: 200 kHz to 2.2 MHz (500 kHz default)
- Frequency Synchronization to External Clock
- Internal Compensation
- Stable with Almost Any Combination of Ceramic, Polymer, Tantalum, and Aluminum Capacitors
- Power-Good Flag
- Soft Start into Pre-Biased Load
- Internal Soft Start: 4.1 ms (extendable by external capacitor)
- Output Voltage Tracking Capability
- Precision Enable to Program System UVLO
- Output Short-Circuit Protection with Hiccup Mode
- Overtemperature Thermal Shutdown Protection
Applications
- Industrial Power Supplies
- Telecommunications Systems
- Sub-AM Band Automotive
- General Purpose Wide VIN Regulation
- High Efficiency Point-Of-Load Regulation
Q & A
- What is the input voltage range of the LM43600?
The input voltage range of the LM43600 is from 3.5 V to 36 V, with a transient tolerance of 42 V.
- What is the maximum output current of the LM43600?
The maximum output current of the LM43600 is 0.5 A.
- What are the key features of the LM43600?
The LM43600 features high efficiency at light load, meets EN55022/CISPR 22 EMI standards, integrated synchronous rectification, adjustable frequency range, and more.
- What is the default switching frequency of the LM43600?
The default switching frequency of the LM43600 is 500 kHz.
- Does the LM43600 support frequency synchronization?
Yes, the LM43600 supports frequency synchronization to an external clock.
- What type of thermal protection does the LM43600 have?
The LM43600 has overtemperature thermal shutdown protection.
- How does the LM43600 handle short-circuit protection?
The LM43600 has output short-circuit protection with hiccup mode.
- What is the quiescent current of the LM43600 in regulation?
The quiescent current of the LM43600 in regulation is 33 µA.
- What are the typical applications of the LM43600?
The LM43600 is typically used in industrial power supplies, telecommunications systems, sub-AM band automotive, general purpose wide VIN regulation, and high efficiency point-of-load regulation.
- What package type is the LM43600 available in?
The LM43600 is available in a 16-pin HTSSOP (PWP) package.
