MAX8653 Datasheet, PDF(1/1 Page) Maxim Integrated Products – Dual, 5A, 1.5MHz Step-Down Regulator with Integrated High-Side Switches

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MAX8653 Datasheet, PDF (1/1 Pages) Maxim Integrated Products – Dual, 5A, 1.5MHz Step-Down Regulator with Integrated High-Side Switches

XX-XXXX; Rev 0; 7/07

Dual, 5A, 1.5MHz Step-Down

Regulator with Integrated High-Side Switches

General Description

Features

The MAX8653 dual-output, synchronous, step-down reg- â¦ Integrated 80mÎ© RDS(ON), High-Side MOSFETs

ulator contains low RDS(ON) integrated high-side

MOSFET switches for ease of layout and achieving small

â¦ Adjustable Hiccup-Mode Short-Circuit Current-

footprints. Each output delivers up to 5A. The output

Limit Protection

voltage is adjustable down to 0.6V and operates from a

9V to 14V input voltage. The MAX8653 uses a proprietary

high-bandwidth, constant-frequency, peak-voltage-mode

control architecture and operates at an adjustable switch-

ing frequency between 300kHz to 1.5MHz. The architec-

Y ture is suitable for use with a wide range of output

capacitor technologies such as aluminum electrolytic,

POSCAPs, and ceramic capacitors for flexible design.

The simple compensation scheme achieves fast

R response under both line and load transients.

The switching frequency is adjustable using a single

external resistor. The output channels operate 180Â° out-

of-phase to reduce the input ripple current, thus reduc-

A ing the required input capacitance. The high operating

frequency minimizes the size of external components.

The external reference input (REFIN) enables imple-

mentation of tracking applications such as DDR power

N supplies. The MAX8653 utilizes internal digital soft-start

and features a lossless (cycle-by-cycle) current sens-

I ing. It includes adjustable, hiccup-mode current-limit

and short-circuit protection for minimum power dissipa-

tion under fault conditions. Each output contains an

enable (EN_) input along with a power-good (POK_)

signal for easy sequencing. The MAX8653 is available

M in a 28-pin, 5mm x 5mm Thin QFN package.

I Applications

Telecom

Network Equipment

L Storage

Servers

DDR Memories

DSL

Set-Top Box

Cable Modem

â¦ Â±1% Output Accuracy over Load, Line, and

Temperature

â¦ 9V to 14V Input Supply Range

â¦ Adjustable Output Down to 0.6V

â¦ Digital Soft-Start Reduces Inrush Supply Current

â¦ 300kHz to 1.5MHz Adjustable Switching

Frequency

â¦ External Frequency Synchronization

â¦ Compatible with Ceramic, Polymer, and

Electrolytic Capacitors

â¦ 180Â° Out-of-Phase Operation

â¦ Enable and POK for Each Output

â¦ REFIN Feature for Tracking Applications

â¦ 28-Lead 5mm x 5mm Thin QFN Package

Ordering Information

PART

TEMP

RANGE*

PIN-PACKAGE

PKG

CODE

MAX8653ETI+ -40Â°C to +85Â°C 28 Thin QFN-EP** T2855-5

(5mm x 5mm)

+Denotes lead-free package.

*The MAX8653 is specified in the extended temperature range.

**EP = Exposed pad.

Pin Configuration appears at end of data sheet.

Typical Operating Circuit

RE OUTPUT

P1.5V, 5A

INPUT

9V TO 14V

IN1

V+

IN2

POK1

BST1

POK2

BST2

LX1

MAX8653

LX2

OUTPUT2

3.3V, 2A

DL1

DL2

FB1

ILIM1

FB2

ILIM2

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.