MAX5073 Maxim Integrated Products, MAX5073 Datasheet

MAX5073

Manufacturer Part Number

MAX5073

Description

Dual-Output Buck or Boost Converter

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5073.pdf (25 pages)

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The MAX5073 is a dual-output DC-DC converter with inte-

grated high-side n-channel power MOSFETs. Each output

can be configured either as a buck converter or a boost

converter. The device is capable of operating from a wide

5.5V to 23V input voltage range. Each output is program-

mable down to 0.8V in the buck mode and up to 28V in

the boost mode with an output voltage accuracy of ±1%.

In the buck mode, converter 1 and converter 2 can deliv-

er 2A and 1A, respectively. The output switching frequen-

cy of each converter can be programmed from 200kHz to

2.2MHz to avoid harmonics in a radio power supply or to

reduce the size of the power supply. Each output oper-

ates 180° out-of-phase thus reducing input-capacitor rip-

ple current, size, and cost. A SYNC input facilitates

external frequency synchronization. Moreover, a CLKOUT

output provides out-of-phase clock signal with respect to

converter 2, allowing four-phase operation using two

MAX5073 ICs in master-slave configuration.

The MAX5073 includes an internal digital soft-start that

reduces inrush current, eliminates output-voltage over-

shoot, and ensures monotonic rise in output voltage

during power-up. The device includes individual shut-

down and a power-good output for each converter.

Protection features include output short-circuit protec-

tion for buck mode and maximum duty-cycle limit for

boost operation, as well as thermal shutdown.

The MAX5073 is available in a thermally enhanced 28-

pin thin QFN package that can dissipate 2.7W at +70°C

ambient temperature. The device is rated for operation

over the -40°C to +85°C extended, or -40°C to +125°C

automotive temperature range.

*EP = Exposed pad.

+Denotes lead-free package.

Ordering Information continued at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

19-3504; Rev 2; 2/06

MAX5073ETI

M AX5073E TI+

PART

2.2MHz, Dual-Output Buck or Boost Converter

Automotive Radio Power Supply

Point-of-Load DC-DC Converters

Telecom Line Card

Networking Line Card

Power-Over-Ethernet Postregulation for PDs

-40°C to +85°C

TEMP RANGE

________________________________________________________________ Maxim Integrated Products

Ordering Information

General Description

PIN-PACKAGE

28 Thin QFN-EP*

(5mm x 5mm)

28 Thin QFN-EP*

(5mm x 5mm)

Applications

with Internal Power MOSFETs

T2855-6

CODE

PKG

♦ 4.5V to 5.5V or 5.5V to 23V Input Supply

♦ 0.8V (Buck) to 28V (Boost) Output Voltage

♦ Two Independent Output DC-DC Converters

♦ Each Output can be Configured in Buck or Boost

♦ I

♦ 180° Out-of-Phase Operation

♦ Clock Output for Four Phase Operation

♦ Switching Frequency Programmable from 200kHz

♦ Digital Soft-Start and Sync Input

♦ Individual Converter Shutdown and Power-Good

♦ Short-Circuit Protection (Buck)/Maximum Duty-

♦ Thermal Shutdown

♦ Thermally Enhanced 28-Pin Thin QFN Package

Voltage Range

with Internal Power MOSFETs

Mode

Buck Mode

to 2.2MHz

Output

Cycle Limit (Boost)

Dissipates up to 2.7W at +70°C

OUT1

SOURCE1

SOURCE2

TOP VIEW

PGOOD2

SGND

PGND

and I

OUT2

of 2A and 1A (Respectively) in

THIN QFN

MAX5073

Pin Configuration

Features

BYPASS

V+

OSC

N.C.

SYNC

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