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MAX746

High-Efficiency, PWM, Step-Down, N-Channel DC-DC Controller

Overview

Technical Documents

Ordering Info

Status

All versions are No Longer Available. See Ordering Information for recommended replacements.

Description

The MAX746 is a high-efficiency, high-current, step-down DC-DC power-supply controller that drives external N-channel FETs. It provides 93% to 96% efficiency from a 6V supply voltage with load currents ranging from 50mA up to 3A. It uses a pulse-width-modulating (PWM) current-mode control scheme to provide precise output regulation and low output noise. The MAX746's 4V to 15V input voltage range, fixed 5V/adjustable (Dual-Mode™) output, and adjustable current limit make this device ideal for a wide range of applications.

High efficiency is maintained with light loads due to a proprietary automatic pulse-skipping control (Idle-Mode™) scheme that minimizes switching losses by reducing the switching frequency at light loads. The low 950µA quiescent current and ultra-low 1.4µA shutdown current further extend battery life.

External components are protected by the MAX746's cycle-by-cycle current limit. The MAX746 also features a 2V ±1.5% reference, a comparator for low-battery detection or level translating, and soft-start and shutdown capability.

The MAX747-discussed in a separate data sheet-functions similarly to the MAX746, but drives P-channel logic level FETs.

Data Sheet

Download	Rev 1	(PDF, 168kB)
E-Mail

Key Features

93% to 96% Efficiency for 50mA to 3A Output Currents
4V to 15V Input Voltage Range
Low 950µA Supply Current
1.4µA Shutdown Current
Drives External N-Channel FETs
Fixed-Frequency Current-Mode PWM (Heavy Loads)
Idle-Mode PFM (Light Loads)
Cycle-by-Cycle Current Limiting
2V ±1.5% Accurate Reference Output
Adjustable Soft-Start
Undervoltage Lockout
Precision Comparator for Power-Fail or Low-Battery Warning

Applications/Uses

5V to 3.3V Green PC Applications
Battery-Powered Applications
Cell Phones
Notebook Computers
PDAs and Other Handheld Devices

Diagram

Typical Operating Circuit

Product Guides

Wireless (PDF)

Reliability Reports

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Software/Models

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Ordering Information

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Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX746CPE		N/A	No Longer Available	MAX1745	PDIP(N);16 pin;158.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P16-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX746CPE+		N/A	No Longer Available	MAX1745	PDIP(N);16 pin;158.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P16+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX746CSE		N/A	No Longer Available	MAX1745	SOIC(N);16 pin;61.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX746CSE-T		N/A	No Longer Available	MAX1745	N.SO;16 pin Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX746EPE		N/A	No Longer Available	MAX1745	PDIP(N);16 pin;158.4 mm² Outline Drawing:21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P16-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX746ESE		N/A	No Longer Available	MAX1745	SOIC(N);16 pin;61.9 mm² Outline Drawing:21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX746ESE-T		N/A	No Longer Available	MAX1745	N.SO;16 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX746MJE		N/A	No Longer Available	MAX1745	CDIP(N);16 pin;173.5 mm² Outline Drawing:21-0045 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: J16-3*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Notes and Comments

Drives external n-channel FET

Similar Products by Function

MAX747

High-Efficiency, PWM, Step-Down Controller (External P-Channel Driver)

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-0192 Rev 1; 1993-11-01
This page last modified: 2007-05-30