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MAX8855, MAX8855A

Dual, 5A, 2MHz Step-Down Regulators

Smallest, Most Efficient 5A Regulators with Integrated Switches in 5mm x 5mm TQFN Package

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.25
VIN (V) (max) 3.6
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 5
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins TQFN/32
Budgetary
Price (See Notes)
8.77
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Simplified Block Diagram

Technical Docs

Data Sheet Dual, 5A, 2MHz Step-Down Regulators Oct 21, 2011

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.25
VIN (V) (max) 3.6
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 5
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 2000
Design Tools generateDesignEESIMUrl('https://maxim.transim.com/pwm2/designreq/Index?partId=3613', '')
Package/Pins TQFN/32
Budgetary
Price (See Notes)
8.77

Key Features

  • 27mΩ On-Resistance Internal MOSFETs
  • Dual, 5A, PWM Step-Down Regulators
  • Fully Protected Against Overcurrent, Short Circuit, and Overtemperature
  • ±1% Output Accuracy Over Load, Line, and Temperature
  • Operates from 2.25V to 3.6V Supply
  • REFIN on One Channel for Tracking or External Reference
  • Integrated Boost Diodes
  • Adjustable Output from 0.6V to 0.9 x VIN
  • Soft-Start Reduces Inrush Supply Current
  • 0.5MHz to 2MHz Adjustable Switching, or FSYNC Input
  • All-Ceramic-Capacitor Design
  • 180° Out-of-Phase Operation Reduces Input Ripple Current
  • Individual Enable Inputs and PWRGD Outputs
  • Safe-Start into Prebiased Output
  • Available in 5mm x 5mm Thin QFN Package
  • Sink/Source Current in DDR Applications

Applications/Uses

  • ASIC/CPU/DSP Power Supplies
  • DDR Power Supplies
  • Network Power Supplies
  • Printer Power Supplies
  • Set-Top Box Power Supplies

Description

The MAX8855/MAX8855A high-efficiency, dual step-down regulators are capable of delivering up to 5A at each output. The devices operate from a 2.25V to 3.6V supply, and provide output voltages from 0.6V to 0.9 x VIN, making them ideal for on-board point-of-load applications. Total output error is less than ±1% over load, line, and temperature.

The MAX8855/MAX8855A operate in PWM mode with a switching frequency ranging from 0.5MHz to 2MHz, set by an external resistor. It can also be synchronized to an external clock in the same frequency range. Two internal switching regulators operate 180° out-of-phase to reduce the input ripple current, and consequently reduce the required input capacitance. The high operating frequency minimizes the size of external components. High efficiency, internal dual-nMOS design keeps the board cool under heavy loads. The voltage-mode control architecture and the high-bandwidth (> 15MHz typ) voltage-error amplifier allow a type III compensation scheme to be utilized to achieve fast response under both line and load transients, and also allow for ceramic output capacitors.

Programmable soft-start reduces input inrush current. Two enable inputs allow the turning on/off of each output individually, resulting in great flexibility for system-level designs. A reference input is provided to facilitate output-voltage tracking applications. The MAX8855/MAX8855A are available in a 32-pin TQFN (5mm x 5mm) package with 0.8mm max height.

Simplified Block Diagram

MAX8855: Typical Operating Circuit MAX8855: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Dual, 5A, 2MHz Step-Down Regulators Oct 21, 2011

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

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

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.