MAX5090C Maxim Integrated Products, MAX5090C Datasheet

MAX5090C

Manufacturer Part Number

MAX5090C

Description

High-Efficiency MAXPower Step-Down DC-DC Converters

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5090C.pdf (17 pages)

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The MAX5090A/B/C easy-to-use, high-efficiency, high-

voltage step-down DC-DC converters operate from an

input voltage up to 76V, and consume only 310µA qui-

escent current at no load. This pulse-width-modulated

(PWM) converter operates at a fixed 127kHz switching

frequency at heavy loads, and automatically switches

to pulse-skipping mode to provide low quiescent cur-

rent and high efficiency at light loads. The MAX5090

includes internal frequency compensation simplifying

circuit implementation. The device can also be syn-

chronized with external system clock frequency in a

noise-sensitive application. The MAX5090 uses an

internal low on-resistance and a high-voltage DMOS

transistor to obtain high efficiency and reduce overall

system cost. This device includes undervoltage lock-

out, cycle-by-cycle current limit, hiccup-mode output

short-circuit protection, and overtemperature shutdown.

The MAX5090 delivers up to 2A output current. External

shutdown is included, featuring 19µA (typ) shutdown

current. The MAX5090A/MAX5090B versions have fixed

output voltages of 3.3V and 5V, respectively, while the

MAX5090C features an adjustable 1.265V to 11V output

voltage.

The MAX5090 is available in a space-saving 16-pin thin

QFN package (5mm x 5mm) and operates over the

automotive temperature range (-40°C to +125°C).

19-3872; Rev 0; 3/06

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.

7.5V TO 76V

V IN

Automotive

Industrial

Distributed Power

68µF

0.47µF

BYPASS

Typical Operating Circuit

MAXPower Step-Down DC-DC Converters

________________________________________________________________ Maxim Integrated Products

ON/OFF

SYNC

SGND

10Ω

MAX5090B

PGND

General Description

DRAIN

BST

0.22µF

3.3µF

Applications

BST

0.047µF

PDS5100H

100µH

100µF

OUT

5V/2A

OUT

2A, 76V, High-Efficiency

♦ Wide Input Voltage Range: 6.5V to 76V

♦ Fixed (3.3V, 5V) and Adjustable (1.265V to 11V)

♦ 2A Output Current

♦ Efficiency Up to 92%

♦ Internal 0.26Ω High-Side DMOS FET

♦ 310µA Quiescent Current at No Load

♦ 19µA Shutdown Current

♦ Internal Frequency Compensation

♦ Fixed 127kHz Switching Frequency

♦ External Frequency Synchronization

♦ Thermal Shutdown and Short-Circuit Current Limit

♦ -40°C to +125°C Automotive Temperature Range

♦ 16-Pin (5mm x 5mm) Thin QFN Package

♦ Capable of Dissipating 2.67W at +70°C

Ordering Information continued at end of data sheet.

*The package code is T1655-3.

**EP = Exposed pad.

+Denotes lead-free package.

MAX5090AATE+ -40°C to +125°C 16 TQFN-EP**

MAX5090AATE

MAX5090BATE+ -40°C to +125°C 16 TQFN-EP**

MAX5090BATE

Output-Voltage Versions

PART

TOP VIEW

DRAIN

N.C.

-40°C to +125°C 16 TQFN-EP**

RANGE

TEMP

Ordering Information

MA5090

TQFN

Pin Configuration

PIN-

PACKAGE*

Features

SYNC

VOLTAGE

OUTPUT

(V)

3.3

5.0

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