MAX15015EVKIT【PDF 1/26 页】EVAL KIT FOR MAX15015

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ATION

EVALU

AVAILA

19-0734; Rev 0; 1/07

KIT

BLE

1A, 4.5V to 40V Input Buck Converters with

50mA Auxiliary LDO Regulators

General Description

The MAX15014–MAX15017 combine a step-down DC-

DC converter and a 50mA, low-quiescent-current low-

dropout (LDO) regulator. The LDO regulator is ideal for

powering always-on circuitry in automotive applications.

The DC-DC converter input voltage range is 4.5V to 40V

for the MAX15015/MAX15016, and 7.5V to 40V for the

MAX15014/MAX15017.

The DC-DC converter output is adjustable from 1.26V to

32V and can deliver up to 1A of load current. These

devices utilize a feed-forward voltage-mode control

scheme for good noise immunity in the high-voltage

switching environment and offer external compensation

allowing for maximum flexibility with a wide selection of

inductor values and capacitor types. The switching

frequency is internally fixed at 135kHz and 500kHz,

depending on the version chosen. Moreover, the

switching frequency can be synchronized to an exter-

nal clock signal through the SYNC input. Light load effi-

ciency is improved by automatically switching to a

pulse-skip mode. The soft-start time is adjustable with

an external capacitor. The DC-DC converter can be

disabled independent of the LDO, thus reducing the

quiescent current to 47μA (typ).

The LDO linear regulators operate from 5V to 40V and

deliver a guaranteed 50mA load current. The devices

feature a preset output voltage of 5V (MAX1501_A) or

3.3V (MAX1501_B). Alternatively, the output voltage

can be adjusted from 1.5V to 11V by using an external

resistive divider. The LDO section also features a

Features

o Combined DC-DC Converters and Low-Quiescent-

Current LDO Regulators

o 1A DC-DC Converters Operate from 4.5V to 40V

(MAX15015/MAX15016) or 7.5V to 40V

(MAX15014/MAX15017)

o Switching Frequency of 135kHz

(MAX15014/MAX15016) or 500kHz

(MAX15015/MAX15017)

o 50mA LDO Regulator Operates from 5V to 40V

Independent of the DC-DC Converter

o 47 μ A Quiescent Current with DC-DC Converter

Off and LDO On

o 6 μ A System Shutdown Current

o Frequency Synchronization Input

o Shutdown/Enable Inputs

o Adjustable Soft-Start Time

o Active-Low Open-Drain R E S E T Output with

Programmable Timeout Delay

o Thermal Shutdown and Output Short-Circuit

Protection

o Space-Saving (6mm x 6mm) Thermally Enhanced

36-Pin TQFN Package

Ordering Information

RESET output with adjustable timeout period.

Protection features include cycle-by-cycle current limit,

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

hiccup-mode output short-circuit protection, and thermal

MAX15014 AATX+ -40°C to +125°C 36 TQFN-EP*

T3666-3

shutdown. All devices are available in a space-saving,

MAX15014BATX+

-40°C to +125°C 36 TQFN-EP*

T3666-3

high-power (2.86W), 36-pin TQFN package and are

rated for operation over the -40°C to +125°C automotive

temperature range.

Applications

MAX15015 AATX+ -40°C to +125°C 36 TQFN-EP*

MAX15015BATX+ -40°C to +125°C 36 TQFN-EP*

MAX15016 AATX+ -40°C to +125°C 36 TQFN-EP*

MAX15016BATX+ -40°C to +125°C 36 TQFN-EP*

MAX15017 AATX+ -40°C to +125°C 36 TQFN-EP*

T3666-3

Car Radios

MAX15017BATX+

-40°C to +125°C 36 TQFN-EP*

T3666-3

Automotive Body Control Modules

Automotive Instrument Cluster

Navigation Systems

+Denotes a lead-free package.

*EP = Exposed pad.

________________________________________________________________ Maxim Integrated Products

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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