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Maxim > Products > Power and Battery Management  Automotive 
MAX668, MAX669
1.8V to 28V Input, PWM Step-Up Controllers in µMAX

Flexible Converters Offer Step-Up, SEPIC, Flyback and Isolated Topologies. MAX668 Output Voltages Limited Only by External Component Ratings.


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Data Sheet
FULL DATA SHEET (PDF, 304kB)
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Description
The MAX668/MAX669 constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controllers are designed for a wide range of DC-DC conversion applications including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%. The 1.8V to 28V input voltage range supports a wide range of battery and AC-powered inputs. An advanced BiCMOS design features low operating current (220µA), adjustable operating frequency (100kHz to 500kHz), soft-start, and a SYNC input allowing the MAX668/MAX669 oscillator to be locked to an external clock.

DC-DC conversion efficiency is optimized with a low 100mV current-sense voltage as well as with Maxim's proprietary Idle Mode™ control scheme. The controller operates in PWM mode at medium and heavy loads for lowest noise and optimum efficiency, then pulses only as needed (with reduced inductor current) to reduce oper-ating current and maximize efficiency under light loads. A logic-level shutdown input is also included, reducing supply current to 3.5µA.

The MAX669, optimized for low input voltages with a guaranteed start-up voltage of 1.8V, requires boot-strapped operation (IC powered from boosted output). It supports output voltages up to 28V. The MAX668 operates with inputs as low as 3V and can be connected in either a bootstrapped or non-bootstrapped (IC powered from input supply or other source) configuration. When not bootstrapped, it has no restriction on output voltage. Both ICs are available in an extremely compact 10-pin µMAX® package.

Key Features   Applications/Uses
  • 1.8V Minimum Start-Up Voltage (MAX669)
  • Wide Input Voltage Range (1.8V to 28V)
  • Tiny 10-Pin µMAX Package
  • Current-Mode PWM and Idle Mode™ Operation
  • Efficiency Over 90%
  • Adjustable 100kHz to 500kHz Oscillator or SYNC Input
  • 220µA Quiescent Current
  • Logic-Level Shutdown
  • Soft-Start

 
  		• Audio Systems
  		• LANs and Network Systems
  		• POS Systems
  		• Telecom Hardware

    Key Specifications:   Step-Up Switching Regulators
    Part Number VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) Output Adj. Method Operating Current, ICC (max) (mA) Number of DC-DC Outputs Operating Freq. (kHz) Features EV-Kit Industry Qualified Package RoHS Available Operating Temp. Range (°C) Price**
    MAX668  3 28 3 100 Resistor 0.22 1 500
    •Current Limit
    •External Synchronization
    •Fixed Frequency/ PWM Operation
    •Shutdown
    •Soft Start
    		 Yes Automotive - General uMAX/10 Yes -40 to +85 $2.10 @ 1k
    MAX669  1.8 28  -  $2.10 @ 1k
    See All Step-Up Switching Regulators (89)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Diagram
    MAX668, MAX669: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 294: Dual-Output SLIC Supply Shares Feedback - MAX668
  		• Application Note 296: 3.3V Supply Taps Power from the -12V PCI Bus - MAX668
  		• Application Note 433: 5V Input Converter Generates -30V at 80mA - MAX668
  		• Application Note 435: +12V Input Converter Generates -165V at 100mA - MAX668
  		• Application Note 436: Extending Soft-Start - MAX668
  		• Application Note 471: Step-up Converter with LDO Beats SEPIC Efficiency - MAX668
  		• Application Note 529: 15V Input Converter Generates -185V at 50mA - MAX668
  		• Application Note 716: Proper Layout and Component Selection Controls EMI - MAX668
  		• Application Note 735: Layout Considerations for Non-Isolated DC-DC Converters - MAX668
  		• Application Note 904: SLIC Power-Supply Design - MAX668
  		• Application Note 907: R-C Snubbing for the Lab - MAX668
  		• Application Note 910: High-Efficiency Boost Converter Provides 24V for DTE - MAX668
  		• Application Note 911: High-Efficiency Boost Converter Provides 48V for IP Phones - MAX668
  		• Application Note 945: Step-Up Controller Forms Negative Step-Down Regulator - MAX668
  		• Application Note 1109: Small, High-Voltage Boost Converters - MAX668
  		• Application Note 1115: Isolated SLIC Supply - MAX668
  		• Application Note 1161: Current Limited DC-DC Controller Used as Step-Up Step-Down SEPIC Power Supply for USB Devices - MAX668
  		• Application Note 2031: DC-DC Converter Tutorial - MAX668
  		• Application Note 3843: ±15V Switch-Mode Power Supply Has Wide Input-Voltage Range - MAX668
  		• Application Note 3943: ±15V or ±12V Output Switch-Mode Power Supply Has Wide Input-Voltage Range - MAX668

    Evaluation Kits
  		• MAX668EVKIT

    Reliability Reports
  		• Show FIT data for:
  		• Reliability Report: MAX668EUB.pdf
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * 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

    MAX668 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX668EUB  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX668EUB-T  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX668EUB+  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX668EUB+T  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX669 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX669EUB  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX669EUB-T  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX669EUB+  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX669EUB+T  
    		uMAX;10 pin;
    Dwg: 21-0061L (PDF)
    Use pkgcode/variation: U10+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Notes and Comments
    • 1.8V to 28V input voltage range, PWM step-up converter

    More Information
  		• MAX668, MAX668,MAX8867, MAX669Power Supply Cookbook

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    Document Ref.: 19-4778; Rev 1; 2002-10-10
    This page last modified: 2007-06-01




             


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