MAX668

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.


Please check latest availability status for a specific part variant.

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 operating 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.

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MAX668, MAX669: Typical Operating Circuit MAX668, MAX669: Typical Operating Circuit Enlarge+

Key Features

  • 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

Applications/Uses

  • Cellular Telephones
  • LANs and Network Systems
  • POS Systems
  • Telecom Hardware

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX668EVKIT: Evaluation Kit for the MAX668, MAX669

Technical Documents

User Guide 5861 EE-SIM Design and Simulation Environment User Guide
Sub-System Board 5509 Oceanside (MAXREFDES9#): 3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply
Tutorial 4992 Reduce the Chances of Human Error: Part 1, Power and Ground
App Note 4834 Negative-to-Negative Switch-Mode Converter Offers High Current and High Efficiency
App Note 4495 Current-Sense Amplifier Doubles as a High-Common Mode Instrumentation Amplifier
App Note 3943 ±15V or ±12V Output Switch-Mode Power Supply Has Wide Input-Voltage Range
Tutorial 2031 DC to DC Buck Converter Tutorial
App Note 1161 Current Limited DC-DC Controller Used as Step-Up Step-Down SEPIC Power Supply for USB Devices
App Note 1115 Isolated SLIC supply
Tutorial 1109 Small, High-Voltage Boost Converters
App Note 945 Step-Up Controller Forms Negative Step-Down Regulator
App Note 911 High-Efficiency Boost Converter Provides 48V for IP Phones
App Note 910 High-Efficiency Boost Converter Provides 24V for DTE
App Note 907 R-C Snubbing for the Lab
App Note 904 SLIC Power-Supply Design
Tutorial 735 Layout Considerations for Non-Isolated DC-DC Converters
Tutorial 716 Proper Layout and Component Selection Controls EMI
App Note 621 Simple Circuit Charges Lead-Acid Batteries
App Note 529 15V Input Converter Generates -185V at 50mA
App Note 471 Step-up Converter with LDO Beats SEPIC Efficiency
App Note 436 Extending Soft-Start
App Note 435 +12V Input Converter Generates -165V at 100mA
App Note 433 5V Input Converter Generates -30V at 80mA
App Note 296 3.3V Supply Taps Power from the -12V PCI Bus

Additional Resources

Essential Analog Toolkit: Boost Regulators
Product Reliability Reports: MAX668.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

 
Status:
Package:
Temperature:

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Type ID Title
User Guide 5861 EE-SIM Design and Simulation Environment User Guide
Sub-System Board 5509 Oceanside (MAXREFDES9#): 3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply
Tutorial 4992 Reduce the Chances of Human Error: Part 1, Power and Ground
App Note 4834 Negative-to-Negative Switch-Mode Converter Offers High Current and High Efficiency
App Note 4495 Current-Sense Amplifier Doubles as a High-Common Mode Instrumentation Amplifier
App Note 3943 ±15V or ±12V Output Switch-Mode Power Supply Has Wide Input-Voltage Range
Tutorial 2031 DC to DC Buck Converter Tutorial
App Note 1161 Current Limited DC-DC Controller Used as Step-Up Step-Down SEPIC Power Supply for USB Devices
App Note 1115 Isolated SLIC supply
Tutorial 1109 Small, High-Voltage Boost Converters
App Note 945 Step-Up Controller Forms Negative Step-Down Regulator
App Note 911 High-Efficiency Boost Converter Provides 48V for IP Phones
App Note 910 High-Efficiency Boost Converter Provides 24V for DTE
App Note 907 R-C Snubbing for the Lab
App Note 904 SLIC Power-Supply Design
Tutorial 735 Layout Considerations for Non-Isolated DC-DC Converters
Tutorial 716 Proper Layout and Component Selection Controls EMI
App Note 621 Simple Circuit Charges Lead-Acid Batteries
App Note 529 15V Input Converter Generates -185V at 50mA
App Note 471 Step-up Converter with LDO Beats SEPIC Efficiency
App Note 436 Extending Soft-Start
App Note 435 +12V Input Converter Generates -165V at 100mA
App Note 433 5V Input Converter Generates -30V at 80mA
App Note 296 3.3V Supply Taps Power from the -12V PCI Bus