LM43603-Q1

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Automotive Qualified 3.5V to 36V, 3A Synchronous Step-Down Voltage Converter

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Product details

Parameters

Vin (Min) (V) 3.5 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 28 Iout (Max) (A) 3 Iq (Typ) (mA) 0.027 Iq (Typ) (uA) 27 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 16 32 mm² 5 x 6.4 open-in-new Find other Buck converters (integrated switch)

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Operating Junction Temperature
  • 27-µA Quiescent Current in Regulation
  • 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 a Pre-Biased Load
  • Internal Soft Start: 4.1 ms
  • Extendable Soft-Start Time by External Capacitor
  • Output Voltage Tracking Capability
  • Precision Enable to a Program System UVLO
  • Output Short Circuit Protection with Hiccup Mode
  • Overtemperature Thermal Shutdown Protection
  • Create a Custom Design Using the LM43603-Q1 With the WEBENCH® Power Designer

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Description

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.

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Technical documentation

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Type Title Date
* Datasheet LM43603-Q1 3.5-V to 36-V, 3-A Synchronous Step-Down Voltage Converter datasheet (Rev. C) Oct. 20, 2017
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes Differences Between LM4600x/LM4360x A and Non-A OPNs Mar. 27, 2018
Technical articles Is a LiFePO4 or Lithium-ion battery better for eCall systems? Oct. 25, 2016
Technical articles A complete low-voltage backup battery solution for eCall systems Mar. 04, 2016
Technical articles Overcoming automotive cluster power supply design challenges Nov. 13, 2015
Application notes Inverting Applications Made SIMPLE With LM4600x and LM4360x (Rev. B) Feb. 20, 2015
Application notes Thermal Design Made Simple With LM43603 and LM46002 Sep. 15, 2014
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Application notes Compensation Made SIMPLE With LM4360x, LM4600x Jul. 29, 2014
Application notes Automotive Line Transient Protection Circuit Jul. 01, 2014
Application notes AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
29
Description

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.

Features
  • High efficiency at light load
  • Synchronous rectification
  • Internal compensation
  • Frequency synchronization

Design tools & simulation

SIMULATION MODELS Download
SNVM572.ZIP (76 KB) - PSpice Model
SIMULATION MODELS Download
SNVM585A.ZIP (525 KB) - PSpice Model
SIMULATION MODELS Download
SNVM605.ZIP (52 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SNVM609.TSC (88 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM717A.ZIP (6 KB) - PSpice Model
SIMULATION MODELS Download
SNVM724.ZIP (1 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Automotive eCall Power Supply Reference Design with Low Intermediate Voltage
PMP9769 This reference design includes a complete power management solution for a standalone emergency call (eCall) system in an automotive environment. The circuit is supplied directly from the car battery rail. It also manages a backup battery to power the eCall system while the car battery rail is not (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive Single-port USB Charging featuring LM43603 and TPS2543 Reference Design
PMP9080 Compact design for automotive single-port USB charging featuring the new synchronous 36V, 3A LM43603 SIMPLE SWITCHER and the TPS2543 USB Switch and Controller. LM2904 is used to provide cable droop compensation.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Wide Vin, 3A Buck 2-Layer Reference Design for Automotive Cluster with CISPR 25 Class 5 Compliance
PMP10735 The PMP10735 reference design is a 5V, 3A output power supply in a 2-layer board design for off-battery automotive instrument cluster applications. The reference board has an input EMI filter and optmized layout for improved EMI performance.
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 16 View options

Ordering & quality

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