Maxim > Products > Power and Battery Management > MAX727, MAX728, MAX729

MAX727, MAX728, MAX729

5V/3.3V/3V 2A Step-Down, PWM, Switch-Mode DC-DC Regulators

Overview

Technical Documents

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Status

Part Number	Status	Explanation
MAX727	This product is No Longer Available.	This product was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. For further information, contact us. The data sheet remains available for existing users. To the best of our knowledge, a second-source replacement for this part is available from Linear Technology.
MAX728	This product is No Longer Available.	This product was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. For further information, contact us. The data sheet remains available for existing users. To the best of our knowledge, a second-source replacement for this part is available from Linear Technology.
MAX729	This product is No Longer Available.	This product was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. For further information, contact us. The data sheet remains available for existing users. To the best of our knowledge, a second-source replacement for this part is available from Linear Technology.

Description

The MAX727/MAX728/MAX729 are monolithic, bipolar, pulse-width modulation (PWM), switch-mode, step-down DC-DC regulators. Each is rated at 2A. Very few external components are needed for standard operation because the power switch, oscillator, feedback, and control circuitry are all on-chip. Employing a classic buck topology, these regulators perform high-current step-down functions.

These regulators have excellent dynamic and transient response characteristics, while featuring cycle-by-cycle current limiting to protect against overcurrent faults and short-circuit output faults. They also have a wide 8V to 40V input range.

Each regulator is available in a 5-pin TO-220 package. These devices have a preset 100kHz oscillator frequency and a preset current limit of 2.6A. See the MAX724/ MAX726 data sheet for more applications information.

Data Sheet

Download	Rev 2	(PDF, 56kB)
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Key Features

Input Range: Up to 40V
2A On-Chip Power Switch
Fixed Outputs:
- 5V (MAX727)
- 3.3V (MAX728)
- 3V (MAX729)
100kHz Switching Frequency
Excellent Dynamic Characteristics
Few External Components
8.5mA Quiescent Current
TO-220 Package

Applications/Uses

Distributed Power from High-Voltage Buses
High-Current, High-Voltage Step-Down Applications
Multiple-Output Buck Converter

Reliability Reports

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Ordering Information

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Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX727CCK		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX727CCK-SL		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX727ECK		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX727ECK-SL		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX728CCK		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX728ECK		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX729CCK		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX729ECK		N/A	No Longer Available	TO220;5 pin;176 mm² Land Pattern: Not Available Use pkgcode/variation: C225-1*	-40°C to +85°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

2A Step-Down, PWM, Switch-Mode DC-DC Converter
5V (MAX727)
3.3V (MAX728)
3V (MAX729)

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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.: 19-0149 Rev 2; 1995-09-01
This page last modified: 2007-07-17