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12V, 8A, 1.2MHz, Step-Down Regulator

A Broad Input Voltage (+4.5V to +12V) Step-Down Regulator with Integrated MOSFETs that Offers a Wealth of Features and Excellent Design Flexibility for High-Current (< 10A), High-Power Density POL Supplies

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 14
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 12
IOUT1 (A) (max) 8
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
Design Tools EE-Sim
Package/Pins TQFN/36
Budgetary
Price (See Notes)
6.95
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 14
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 12
IOUT1 (A) (max) 8
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1200
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=5531', '')
Package/Pins TQFN/36
Budgetary
Price (See Notes)
6.95

Key Features

  • Internal 26mΩ RDS(ON) MOSFETs
  • Guaranteed 8A Output Current
  • Adjustable Overcurrent Protection
  • 1% Output Accuracy Over Temperature
  • Operates from 4.5V to 14V Supply
  • Adjustable Output from 0.6V to 0.85 x VIN
  • Soft-Start Reduces Inrush Supply Current
  • 250kHz to 1.2MHz Adjustable Switching or SYNC Input
  • Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors
  • SYNCOUT Synchronizes 2nd Regulator 180° Out-of-Phase
  • 36-Pin, Lead-Free, 6mm x 6mm TQFN Package

Applications/Uses

  • DDR Memory
  • Graphic Cards
  • Network-Power Supplies
  • POL Power Supplies
  • RAID Power Supplies
  • Servers

Description

The MAX8654 high-efficiency switching regulator delivers up to 8A of load current at output voltages from 0.6V to 0.85 x VIN. The IC operates from 4.5V to 14V, making it ideal for on-board point-of-load and postregulation applications, with total output error less than ±1% over load, line, and temperature ranges.

The MAX8654 is a fixed-frequency PWM mode regulator with a switching frequency range of 250kHz to 1.2MHz set by an external resistor or SYNC input. High-frequency operation allows for an all-ceramic-capacitor solution. A SYNCOUT output is provided to synchronize a second regulator switching 180° out-of-phase with the first to reduce the input ripple current and consequently reduce the required input capacitance. The high operating frequency minimizes the size of external components.

The on-board low RDS(ON) dual-nMOS design keeps the board cooler at heavy loads while minimizing the critical inductances, making the layout a much simpler task with respect to the discrete solutions.

The MAX8654 comes with a high-bandwidth (20MHz) voltage-error amplifier. The voltage-mode control architecture and the op-amp voltage-error amplifier permit a type 3 compensation scheme to be utilized to achieve maximum loop bandwidth, up to 20% of the switching frequency. High loop bandwidth achieves fast transient response resulting in less output capacitance required.

The MAX8654 offers programmable soft-start to accommodate different types of output capacitors and reduce input inrush current. The MAX8654 is available in a 36-lead TQFN package.

Simplified Block Diagram

MAX8654: Typical Operating Circuit MAX8654: Typical Operating Circuit Zoom icon

Technical Docs

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 .