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Data Sheet

FULL DATA SHEET (PDF, 200kB) Download   E-Mail

Description

The MAX1626/MAX1627 step-down DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2A. A unique current-limited, pulse-frequency-modulated (PFM) control scheme operates with up to a 100% duty cycle, resulting in very low dropout voltages. This control scheme eliminates minimum load requirements and reduces the supply current under light loads to 90µA (versus 2mA to 10mA for common pulse-width modulation controllers). These step-down controllers drive an external P-channel MOSFET, allowing design flexibility for applications to 12W or higher. Soft-start reduces current surges during start-up. A high switching frequency (up to 300kHz) and operation in continuous-conduction mode allow the use of tiny surface-mount inductors. Output capacitor requirements are also reduced, minimizing PC board area and system costs. The output voltage is preset at 5V or 3.3V for the MAX1626 and adjustable for the MAX1627. Input voltages can be up to 16.5V. The MAX1626/MAX1627 are functional upgrades for the MAX1649/MAX1651.

Key Features		Applications/Uses
Low Dropout Voltage 100% Maximum Duty Cycle Soft-Start Limits Start-Up Current Efficiency >90% (3mA to 2A Loads) Output Power >12.5W 90µA Max Quiescent Current 1µA Max Shutdown Current Up to 300kHz Switching Frequency 16.5V Max Input Voltage Output Voltage: 5V/3.3V (MAX1626) Adjustable (MAX1627) Current-Limited Control Scheme		5V to 3.3V Green PC Applications Battery-Powered Applications Handheld Computers High-Efficiency Step-Down Regulation Low-Cost Notebook Computer Supplies Minimum Component DC-DC Converters PCMCIA Power Supplies PDAs and Other Handheld Devices Portable Terminals

Diagram

Typical Operating Circuit

Application Notes

Application Note 256: Two AA Cells Power Step-Down Regulator and 3.3V Boost - MAX1627 Application Note 260: Miniature Temperature Monitors Drive 3-Speed Fan Controller - MAX1626 Application Note 3166: Source Resistance: The Efficiency Killer in DC-DC Converter Circuits - MAX1626, MAX1627

Evaluation Kits

MAX1626EVKIT

Design Guides

WIRELESS (PDF)

Reliability Reports

Show FIT data for: MAX1626 MAX1627 Reliability Report: MAX1626ESA.pdf Request Reliability Report for: MAX1627

Software/Models

none

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
MAX1626	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1626ESA			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1626ESA-T			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1626ESA+			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1626ESA+T			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1627	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1627ESA			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1627ESA-T			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1627ESA+			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1627ESA+T			SOIC;8 pin;31 mm² Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes and Comments

Functional upgrades for MAX1649/ MAX1651, with 100% duty cycle, high efficiency

Related Products

MAX863 Dual, High-Efficiency, PFM, Step-Up DC-DC Controller MAX722, MAX723 3.3V/5V Palmtop Computer and LCD Power-Supply Regulator MAX1649, MAX1651 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controller MAX717, MAX717EVKIT, MAX718, MAX718EVKIT, MAX719, MAX719EVKIT, MAX720, MAX720EVKIT, MAX721, MAX721EVKIT 3.3V Palmtop Computer and Flash Memory Power Supply Regulator

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