Overview
The LM43603PWPT is a high-efficiency, 42V input, 3A synchronous buck DC/DC converter from Texas Instruments . It belongs to the TI SIMPLE SWITCHER® power converter series and is designed for industrial control, communication equipment, automotive electronics, embedded systems, and distributed power architectures .
This device integrates high-side and low-side MOSFETs, enabling efficient voltage conversion without the need for external power switches. It supports a wide input voltage range and can directly convert 24V, 28V, or 36V power rails to low-voltage system power supplies such as 5V, 3.3V, and 1.8V. The LM43603PWPT employs a peak current-mode control architecture, featuring fast transient response, low quiescent current, and comprehensive protection functions, effectively improving system reliability and energy efficiency.
With its high integration, miniaturized packaging, andd industrial-grade stable performance, the LM43603PWPT is widely used in PLCs, industrial gateways, test equipment, communication infrastructure, and automotive electronic power modules.
Core parameters
| Parameter | Value |
| Product Type | Synchronous buck DC/DC converter |
| Input voltage range | 3.5V ~ 36V |
| Maximum input withstand voltage | 42V |
| Output current | Maximum 3A |
| Output voltage range | 0.8V ~ 28V (adjustable) |
| Control method | Peak current mode control |
| Switching frequency | 200kHz ~ 2.2MHz (adjustable) |
| efficiency | Up to approximately 95% |
| Integrated power MOSFET | support |
| soft start function | support |
| Protection function | Overcurrent, short circuit, thermal shutdown, undervoltage lockout |
| Encapsulation type | HTSSOP-16 PowerPAD |
| Operating temperature range | -40°C to +125°C |
| Environmental standards | RoHS compliant |
Features
Wide input voltage range design
The LM43603PWPT supports input voltage up to 42V and can accommodate 12V, 24V and 36V power rails commonly found in industrial power systems, reducing the need for additional pre-regulator stages and improving system reliability.
Integrated synchronous MOSFETs improve efficiency
The device integrates high-side and low-side MOSFETs, reducing the number of external components compared to the traditional asynchronous Buck architecture, while also reducing switching losses and improving overall conversion efficiency.
Up to 3A output capability
It supports a maximum continuous output current of 3A, which can meet the power supply needs of various loads such as MCU, FPGA, DSP, communication modules and industrial control chips.
Flexible frequency configuration
It supports adjustable switching frequencies from 200kHz to 2.2MHz, allowing designers to optimize power supply solutions based on efficiency, EMI performance, and peripheral device size requirements.
Low quiescent current and light load optimization
The device supports a light-load energy-saving mode, which reduces power consumption under low load conditions and improves the energy utilization of battery-powered equipment and long-running equipment.
Improve protection mechanisms
Integrated overcurrent protection (OCP), thermal shutdown (TSD), undervoltage lockout (UVLO), and short-circuit protection functions can effectively improve system operation safety.
Typical application scenarios
Industrial automation equipment
PLC, industrial controllers, sensor modules, and power conversion for automation equipment.
Communication infrastructure
Network equipment, wireless communication modules, industrial switches and data acquisition systems.
Embedded systems
Power supply for ARM processors, FPGAs, DSPs, and MCU control platforms.
Automotive electronics
Vehicle information system, control module and auxiliary power conversion.
Test and measurement equipment
Industrial instruments, data acquisition equipment, and laboratory testing platforms.
Comparative Advantage Analysis
| Performance indicators | LM43603PWPT | Standard Buck converter |
| Input range | Up to 42V | Narrower |
| Output capability | 3A | Typically lower |
| Synchronous rectification | support | Partial support |
| Number of external components | few | More |
| Conversion efficiency | high | medium |
| Industrial reliability | excellent | generally |
LM43603PWPT in It has significant advantages in high input voltage adaptability, high efficiency conversion and system integration , making it suitable for industrial-grade power supply designs that require long-term stable operation.
Manufacturer Profile: Texas Instruments
Texas Instruments (TI) is a leading global manufacturer of analog and embedded semiconductors, with extensive technical expertise in power management, interface chips, signal chains, and industrial control. TI’s SIMPLE SWITCHER® series of DC/DC converters, known for their high reliability, high efficiency, and comprehensive design support, are widely used in the industrial, automotive, communications, and consumer electronics markets.
Why choose LM43603PWPT?
● Supports input voltage up to 42V, suitable for industrial power systems.
● Maximum output capacity of 3A to meet various load requirements.
● Integrated synchronous MOSFET for improved conversion efficiency
● Supports wide-range switching frequency adjustment
● Built-in comprehensive protection functions to enhance system reliability.
● HTSSOP PowerPAD package for optimized heat dissipation and space utilization.
Frequently Asked Questions (FAQ)
Q1: Is the LM43603PWPT suitable for 24V industrial power systems?
Yes. The LM43603PWPT supports input voltages up to 42V and can be directly applied to 24V industrial power environments. It can be converted to common digital system voltages such as 5V, 3.3V, and 1.8V, making it ideal for PLCs, industrial controllers, and automation equipment.
Q2: What are the advantages of the LM43603PWPT compared to ordinary buck converter chips?
The LM43603PWPT integrates a synchronous MOSFET and features high-efficiency conversion, wide input range, low quiescent power consumption, and complete protection functions. Compared with traditional buck converter solutions, it can reduce the number of external components, improve system reliability, and reduce PCB space occupation.
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