MAX8654 12V, 8A, 1.2MHz, Step-Down Regulator

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The MAX8654 high-efficiency switching regulator delivers up to 8A of load current at output voltages from 0.6V to 0.85 × V_IN. 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 R_DS(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-pin lead-free thin QFN package.

Key Features

Applications/Uses

Internal 26mΩ R_DS(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 V_IN
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 Thin QFN Package

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

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX8654

4.5

0.6

Resistor

1200

•	Adjustable Frequency

•	Current Limit

•	Fixed Frequency/ PWM Operation

•	Internal Power Switches

•	Low Battery/ Power OK Output

•

Shutdown

•	Soft Start

•	Synchronous Rectifier

Yes

THIN QFN/36

Yes

-40 to +85

$4.25 @ 1k

See All Step-Down Switching Regulators (223)

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.