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2.2MHz, 2A Buck Converters with an Integrated High-Side Switch

Up to 2.2MHz Switching Frequency Prevents Harmonics from Interfering in the ADSL2+ and Automotive AM Radio Frequency Bands

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • 4.5V to 5.5V or 5.5V to 23V Input Voltage Range
  • Output Voltage Adjustable Down to 0.6V
  • 2A Output Current
  • Synchronous Rectifier Driver Output (MAX5089) for Higher Efficiency
  • Resistor-Programmable Switching Frequency from 200kHz to 2.2MHz
  • External Synchronization and Enable (On/Off) Inputs
  • Clock Output for Driving Second Converter 180° Out-Of-Phase (MAX5089)
  • Integrated 150mΩ High-Side n-Channel Power MOSFET
  • Power-On Reset Output (MAX5088)/Power-Good Output (MAX5089)
  • Short-Circuit Protection
  • Thermal-Shutdown Protection
  • Thermally Enhanced 16-Pin TQFN Package Dissipates 2.7W

Applications/Uses

  • Automotive Radio Power Supply
  • IP Phones/WLAN Access Points
  • Servers and Networks
  • xDSL Modem Power Supply

Description

The MAX5088/MAX5089 high-frequency, DC-DC converters with an integrated n-channel power MOSFET provide up to 2A of load current. The MAX5088 includes an internal power MOSFET to enable the design of a nonsynchronous buck topology power supply. The MAX5089 is for the design of a synchronous buck topology power supply. These devices operate from a 4.5V to 5.5V or 5.5V to 23V input voltage and a 200kHz to 2.2MHz resistor-programmable switching frequency. The voltage-mode architecture with a peak switch current-limit scheme provides stable operation up to a 2.2MHz switching frequency. The MAX5088 includes a clock output for driving a second DC-DC converter 180° out-of-phase and a power-on-reset (RESET-bar) output. The MAX5089 includes a power-good output and a synchronous rectifier driver to drive an external low-side MOSFET in the buck converter configuration for high efficiency.

The MAX5088/MAX5089 protect against overcurrent conditions by utilizing a peak current limit as well as overtemperature shutdown providing a very reliable and compact power source for point-of-load regulation applications. Additional features include synchronization, internal digital soft-start, and an enable input. The MAX5088/MAX5089 are available in a thermally enhanced, space-saving 16-pin TQFN (5mm x 5mm) package and operate over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX5088, MAX5089: Typical Application Circuit MAX5088, MAX5089: Typical Application Circuit Zoom icon

Support & Training

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Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .