MAX5073 데이터 시트보기 (PDF) - Maxim Integrated

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MAX5073

2.2MHz, Dual-Output Buck or Boost Converter with Internal Power MOSFETs

Maxim Integrated 

19-3504; Rev 2; 2/06

EVAALVUAAILTAIOBNLEKIT

2.2MHz, Dual-Output Buck or Boost Converter

with Internal Power MOSFETs

General Description

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.

Applications

Automotive Radio Power Supply

Point-of-Load DC-DC Converters

Telecom Line Card

Networking Line Card

Power-Over-Ethernet Postregulation for PDs

Features

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

Voltage Range

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

♦ Two Independent Output DC-DC Converters

with Internal Power MOSFETs

♦ Each Output can be Configured in Buck or Boost

Mode

♦ IOUT1 and IOUT2 of 2A and 1A (Respectively) in

Buck Mode

♦ 180° Out-of-Phase Operation

♦ Clock Output for Four Phase Operation

♦ Switching Frequency Programmable from 200kHz

to 2.2MHz

♦ Digital Soft-Start and Sync Input

♦ Individual Converter Shutdown and Power-Good

Output

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

Cycle Limit (Boost)

♦ Thermal Shutdown

♦ Thermally Enhanced 28-Pin Thin QFN Package

Dissipates up to 2.7W at +70°C

Pin Configuration

TOP VIEW

21 20 19 18 17 16 15

PGOOD2 22

SOURCE1 23

SOURCE1 24

14 BYPASS

13 VL

12 VL

PART

Ordering Information

TEMP RANGE PIN-PACKAGE

PKG

CODE

SGND 25

PGND 26

SOURCE2 27

MAX5073

11 V+

10 OSC

9 N.C.

MAX5073ETI

-40°C to +85°C

28 Thin QFN-EP*

(5mm x 5mm)

T2855-6

MAX5073ETI+ -40°C to +85°C

28 Thin QFN-EP*

(5mm x 5mm)

T2855-6

*EP = Exposed pad.

+Denotes lead-free package.

Ordering Information continued at end of data sheet.

SOURCE2 28

8 SYNC

1234567

THIN QFN

________________________________________________________________ Maxim Integrated Products 1

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.

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