The LM43603-Q1 regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 3 A of load current from an input voltage ranging from 3.5 V to 36 V (42 V absolute maximum). The LM43603-Q1 provides exceptional efficiency, output accuracy, and dropout voltage in a very small solution size. An extended family is available in 0.5-A, 1-A, and 2-A load current options in pin-to-pin compatible packages. Peak current mode control is employed to achieve simple control loop compensation and cycle-by-cycle current limiting. Optional features such as programmable switching frequency, synchronization, power-good flag, precision enable, internal soft-start, extendable soft start, and tracking provide a flexible and easy to use platform for a wide range of applications. Discontinuous conduction and automatic frequency modulation at light loads improve light load efficiency. The family requires few external components and pin arrangement allows simple, optimum PCB layout. Protection features include thermal shutdown, VCC undervoltage lockout, cycle-by-cycle current limit, and output short circuit protection. The LM43603-Q1 device is available in the HTSSOP (PWP) 16-pin leaded package (6.6 mm × 5.1 mm × 1.2 mm). The LM43603A-Q1 version is optimized for PFM operation and recommended for new design. The device is pin-to-pin compatible with LM4360x and LM4600x family.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM43603-Q1 3.5-V to 36-V, 3-A Synchronous Step-Down Voltage Converter datasheet (Rev. C) | PDF | HTML | 20 Oct 2017 |
| Application note | Differences Between LM4600x/LM4360x A and Non-A OPNs | 27 Mar 2018 | ||
| Technical article | A complete low-voltage backup battery solution for eCall systems | PDF | HTML | 05 Mar 2016 | |
| Technical article | Overcoming automotive cluster power supply design challenges | PDF | HTML | 13 Nov 2015 | |
| Application note | Inverting Applications Made SIMPLE With LM4600x and LM4360x (Rev. B) | 20 Feb 2015 | ||
| Application note | Thermal Design Made Simple With LM43603 and LM46002 | 15 Sep 2014 | ||
| Application note | Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) | 12 Sep 2014 | ||
| Application note | Compensation Made SIMPLE With LM4360x, LM4600x | 29 Jul 2014 | ||
| Application note | Automotive Line Transient Protection Circuit | 01 Jul 2014 | ||
| Application note | AN-1197 Selecting Inductors for Buck Converters (Rev. B) | 23 Apr 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
The LM43603PWPEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM43603PWP synchronous step-down converter. The EVM operates from an 3.5V to 36V input and provides a 3.3V output at 3A.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 16 | Ultra Librarian |
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