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Data Sheet

FULL DATA SHEET (PDF, 1MB) Download   E-Mail

Description

The MAX8743 is a dual pulse-width modulation (PWM) controller configured for step-down (buck) topologies that provides the high efficiency, excellent transient response, and high DC output accuracy necessary for stepping down high-voltage batteries to generate lowvoltage chipset and RAM power supplies in notebook computers. The CS_ inputs can be used with low-side sense resistors to provide accurate current limits or can be connected to LX_, using low-side MOSFETs as current- sense elements. High output impedance in shutdown eliminates negative output voltages, saving the cost of a Schottky diode at the output. The on-demand PWM controllers are free running, constant on-time with input feed-forward. This configuration provides ultra-fast transient response, wide input-output differential range, low supply current, and tight load-regulation characteristics. The MAX8743 is simple and easy to compensate. Single-stage buck conversion allows the MAX8743 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery at a higher switching frequency) allows the minimum possible physical size. The MAX8743 is intended for generating chipset, DRAM, CPU I/O, or other low-voltage supplies down to 1V. The MAX8743 is available in 28-pin QSOP and 36-pin thin QFN packages.

Key Features		Applications/Uses
Ultra-High Efficiency Accurate Current-Limit Option Quick-PWM™ with 100ns Load-Step Response 1% VOUT Accuracy over Line and Load High Output Impedance in Shutdown Dual Mode™ Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs Adjustable 1V to 5.5V Output Range 2V to 28V Battery Input Range 200kHz/300kHz/420kHz/540kHz Nominal Switching Frequency Adjustable Overvoltage Protection 1.7ms Digital Soft-Start Drives Large Synchronous-Rectifier FETs Power-Good Window Comparator 2V ±1% Reference Output		1.8V and 2.5V I/O Supplies Chipset/RAM Supplies as Low as 1V CPU Core Supplies Notebook Computers

Diagram

Minimal Operating Circuit

Evaluation Kits

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Reliability Reports

Show FIT data for: MAX8743 Request Reliability Report for: MAX8743

Software/Models

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Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-8 of 8
MAX8743	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8743ETX+G05				-40°C to +85°C	See data sheet
MAX8743EEI			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8743EEI-T			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8743EEI+			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8743EEI+T			QSOP;28 pin; Dwg: 21-0055 (PDF) Use pkgcode/variation: E28+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8743ETX+TG05			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8743ETX			THIN QFN;36 pin; Dwg: 21-0141 (PDF) Use pkgcode/variation: T3666-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8743ETX-T				-40°C to +85°C	See data sheet

Related Products

MAX1761 Small, Dual, High-Efficiency Buck Controller for Notebooks MAX1845 Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit MAX1844 High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers MAX1762, MAX1791 High-Efficiency, 10-Pin µMAX, Step-Down Controllers for Notebooks MAX1714, MAX1714A, MAX1714B High-Speed Step-Down Controller for Notebook Computers

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