Part Number: LM43603PWPR

Manufacturer: Texas Instruments

Description: IC REG BUCK ADJ 3A 16HTSSOP

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of LM43603PWPR

Datasheet  LM43603PWPR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Function Step-Down
Output Configuration Positive
Topology Buck
Output Type Adjustable
Number of Outputs 1
Voltage – Input (Min) 3.5V
Voltage – Input (Max) 36V
Voltage – Output (Min/Fixed) 1V
Voltage – Output (Max) 28V
Current – Output 3A
Frequency – Switching 200kHz ~ 2.2MHz
Synchronous Rectifier Yes
Operating Temperature -40°C ~ 125°C (TJ)
Mounting Type Surface Mount
Package / Case 16-TSSOP (0.173″, 4.40mm Width) Exposed Pad
Supplier Device Package 16-HTSSOP


The LM43603PWPR is an excellent synchronous step-down DC-DC converter in the realm of electronics and power management. This regulator can efficiently drive up to 3 A of load current and has an input voltage range of 3.5 V to 36 V (with an absolute maximum of 42 V). In this detailed tutorial, we will delve into the LM43603PWPR’s characteristics, applications, and benefits, examining how it helps engineers and designers in their pursuit of optimum power solutions.

Understanding the LM43603PWPR: An Overview

The LM43603PWPR is more than just another DC-DC converter; it’s a versatile solution with a lot of power. This regulator has a peak current mode control method for simplicity and efficiency. Not only does this control methodology simplify compensation in the control loop, but it also ensures cycle-by-cycle current limitation.

Key Features of the LM43603PWPR

The LM43603PWPR is more than just another DC-DC converter; it’s a feature-rich solution for power control. Let’s take a look at its essential qualities, each of which contributes to its versatility, efficiency, and adaptability across a wide range of applications.

  • Load Current Options: The LM43603PWPR is available in a variety of load currents ranging from 0.5 A to 3 A. Because of this variety, engineers and designers can adapt the converter’s performance to match the specific needs of their applications. There is an LM43603PWPR version to fit any task, whether it is a low-power device or a high-current system.
  • Wide Input Voltage Range: One of the LM43603PWPR’s most notable features is its wide input voltage range. It can function efficiently between 3.5 V to 36 V, with a maximum input of 42 V. Because of its wide input voltage capability, it is compatible with a wide range of power sources, making it useful for a variety of industrial and automotive applications.
  • Efficiency and Output Accuracy: The LM43603PWPR delivers outstanding efficiency across its load current options, which is critical in power management. This efficiency not only decreases power losses but also helps to reduce heat generation, which contributes to the overall system reliability. Furthermore, the LM43603PWPR has exceptional output precision, guaranteeing that the supplied voltage is stable and within the acceptable tolerance.
  • Compact Size: Space is typically at a premium in modern electronics, and the LM43603PWPR tackles this issue with its tiny form size. This converter, housed in packages like HTSSOP/PWP 16 and VSON-16 with wettable flanks, provides an optimum alternative for designs with limited space without sacrificing performance.
  • Programmable Switching Frequency: Engineers can vary the switching frequency of the LM43603PWPR to meet the needs of their application. This programmable feature enables designers to maximize efficiency and performance based on load needs, achieving an optimal balance between power conversion and electromagnetic interference (EMI).
  • Synchronization and Power-Good Flag: Synchronization is critical in systems with several converters that must work in tandem. The LM43603PWPR allows numerous converters to operate at the same frequency and phase, making synchronization easier. Furthermore, the power-good flag feature gives a dependable signal of the converter’s output condition, which aids in system-level diagnostics and control.
  • Precision Enable and Internal Soft-Start: The precision enable and internal soft-start characteristics of the LM43603PWPR add to its ease of usage. Precision enable guarantees that the converter only engages when necessary, conserving power and improving control. The integrated soft-start technology reduces inrush currents and voltage overshoot during startup, improving component life.
  • Extendable Soft-Start and Tracking: The LM43603PWPR’s extended soft-start capability is invaluable for applications that require specified sequencing or regulated startup periods. It enables users to choose the length of the soft-start phase, ensuring smooth and regulated power-up sequences. Tracking allows for the synchronized startup and shutdown of many converters, which improves system performance.

The LM43603PWPR is more than just a DC-DC converter; it’s an innovative and efficient power management solution. Its feature set, which includes everything from load current options to optional programmable capabilities, makes it an excellent choice for engineers and designers looking to construct optimal, dependable, and high-performance power delivery systems. The LM43603PWPR enables designers to confidently tackle power difficulties in industrial automation, automotive electronics, telecommunications, and renewable energy applications.

Applications of the LM43603PWPR

Because of its adaptability and dependability, the LM43603PWPR can be used in a wide range of applications. Among the notable application areas are:

  • The LM43603PWPR can be a critical component in industrial environments where different components and machines rely on consistent and efficient power. It can power motors, sensors, and control systems, among other things.
  • Automotive Electronics: The automotive sector necessitates dependable power solutions. Because of its wide input voltage range and protection measures, the LM43603PWPR is well suited for use in electric vehicles, infotainment systems, and advanced driver-assistance systems (ADAS).
  • Telecommunications systems necessitate consistent and precise power delivery. Base stations, routers, switches, and other telecom infrastructure can all be powered by the LM43603PWPR.
  • Consumer Electronics: From smart TVs to game consoles, the LM43603PWPR can help many consumer electronics products work more efficiently.
  • Renewable Energy: As the globe transitions to renewable energy sources, DC-DC converters are becoming increasingly important for energy harvesting and storage systems. The LM43603PWPR can help with power conversion optimization in several applications.

Designing with the LM43603PWPR

Designing with the LM43603PWPR is a rewarding experience. Here’s a basic guideline to get you started:

  • Voltage and Current needs: Determine the voltage and current needs of your load. Based on these characteristics, select the suitable LM43603PWPR model.
  • Capacitors for input and output: Choose input and output capacitors that satisfy your application’s voltage and current requirements. These capacitors are critical in maintaining power delivery stability.
  • Feedback Loop Compensation: Proper feedback loop compensation is required for the LM43603PWPR’s peak current mode control. To ensure steady and optimal performance, adhere to the datasheet’s requirements.
  • Protection Circuits: Configure protection methods such as heat shutdown and output short circuit protection based on your application to maintain system reliability.
  • Considerations for Layout: The LM43603PWPR’s small packaging necessitates careful PCB layout. To minimize noise and ensure efficient heat dissipation, adhere to the manufacturer’s layout recommendations.
  • Optional capabilities: If necessary, investigate the LM43603PWPR’s optional capabilities such as programmable switching frequency and power-good flag to adjust the performance to the needs of your application.


In conclusion, the LM43603PWPR stands as a remarkable testament to the boundless innovation within the field of power management. Its impressive efficiency, expansive input voltage range, and versatile features collectively make it an invaluable tool for engineers seeking to enhance and optimize their systems across various industries. As technology evolves, the LM43603PWPR remains a steadfast and adaptable solution at the core of contemporary power electronics.

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