DCDC芯片MAX5035数据手册

DCDC

MAX5035

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General Description

The MAX5035 easy-to-use, high-efficiency, high-volt-

age, step-down DC-DC converter operates from an

input voltage up to 76V and consumes only 270µA qui-

escent current at no load. This pulse-width modulated

(PWM) converter operates at a fixed 125kHz 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 MAX5035

includes internal frequency compensation simplifying

circuit implementation. The device uses an internal low-

on-resistance, high-voltage, DMOS transistor to obtain

high efficiency and reduce overall system cost. This

device includes undervoltage lockout, cycle-by-cycle

current limit, hiccup mode output short-circuit protec-

tion, and thermal shutdown.

The MAX5035 delivers up to 1A output current. The out-

put current may be limited by the maximum power dis-

sipation capability of the package. External shutdown is

included, featuring 10µA (typ) shutdown current. The

MAX5035A/B/C versions have fixed output voltages of

3.3V, 5V, and 12V, respectively, while the MAX5035D

features an adjustable output voltage from 1.25V to

13.2V.

The MAX5035 is available in space-saving 8-pin SO

and 8-pin plastic DIP packages and operates over the

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

Applications

Automotive

Consumer Electronics

Industrial

Distributed Power

Features

♦ Wide 7.5V to 76V Input Voltage Range

♦ Fixed (3.3V, 5V, 12V) and Adjustable

(1.25V to 13.2V) Versions

♦ 1A Output Current

♦ Efficiency Up to 94%

♦ Internal 0.4Ω High-Side DMOS FET

♦ 270µA Quiescent Current at No Load, 10µA

Shutdown Current

♦ Internal Frequency Compensation

♦ Fixed 125kHz Switching Frequency

♦ Thermal Shutdown and Short-Circuit Current

Limit

♦ 8-Pin SO and PDIP Packages

MAX5035

1A, 76V, High-Efficiency MAXPower

Step-Down DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2988; Rev 2; 5/04

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.

PART

TEMP RANGE

PIN-

PACKAGE

OUTPUT

VOLTAGE

(V)

MAX5035AUSA

0°C to +85°C 8 SO

MAX5035AUPA

0°C to +85°C 8 PDIP

MAX5035AASA

-40°C to +125°C

8 SO

3.3

MAX5035BUSA

0°C to +85°C 8 SO

MAX5035BUPA

0°C to +85°C 8 PDIP

MAX5035BASA

-40°C to +125°C

8 SO

5.0

MAX5035CUSA

0°C to +85°C 8 SO

MAX5035CUPA

0°C to +85°C 8 PDIP

MAX5035CASA

-40°C to +125°C

8 SO

MAX5035DUSA

0°C to +85°C 8 SO

MAX5035DUPA

0°C to +85°C 8 PDIP

MAX5035DASA

-40°C to +125°C

8 SO

ADJ

BST

SGND

TOP VIEW

GND

ON/OFF

MAX5035

SO/PDIP

Pin Configuration

MAX5035

GND

BST

SGND

50SQ100

100µH

OUT

7.5V TO 76V

68µF

0.1µF

68µF

OFF

ON/OFF

Typical Operating Circuit

MAX5035

1A, 76V, High-Efficiency MAXPower

Step-Down DC-DC Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

(Voltages referenced to GND, unless otherwise specified.)

.........................................................................-0.3V to +80V

SGND ....................................................................-0.3V to +0.3V

LX.................................................................-0.8V to (V

+ 0.3V)

BST ...............................................................-0.3V to (V

+ 10V)

BST (transient < 100ns)................................-0.3V to (V

+ 15V)

BST to LX................................................................-0.3V to +10V

BST to LX (transient < 100ns) ................................-0.3V to +15V

ON/

OFF........................................................-0.3V to (V

+ 0.3V)

VD...........................................................................-0.3V to +12V

MAX5035A/MAX5035B/MAX5035C ...................-0.3V to +15V

MAX5035D .........................................................-0.3V to +12V

OUT

Short-Circuit Duration...........................................Indefinite

VD Short-Circuit Duration ..............................................Indefinite

Continuous Power Dissipation (T

= +70°C)

8-Pin PDIP (derate 9.1mW/°C above +70°C)...............727mW

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

Operating Temperature Range

MAX5035_U_ _ ...................................................0°C to +85°C

MAX5035_A_ _ ..............................................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS (MAX5035_U_ _)

= +12V, V

ON/OFF

= +12V, I

OUT

= 0, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C. See the

Typical Application Circuit.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAX5035A 7.5

76.0

MAX5035B 7.5

76.0

MAX5035C 15 76

Input Voltage Range V

MAX5035D 7.5

76.0

Undervoltage Lockout UVLO 5.2 V

MAX5035A

= 7.5V to 76V,

OUT

= 20mA to 1A

3.185

3.3

3.415

MAX5035B

= 7.5V to 76V,

OUT

= 20mA to 1A

4.85

5.0

5.15

Output Voltage V

OUT

MAX5035C

= 15V to 76V,

OUT

= 20mA to 1A

11.64

12.36

Feedback Voltage V

= 7.5V to 76V, MAX5035D

1.192 1.221 1.250

= 12V, I

LOAD

= 0.5A, MAX5035A 86

= 12V, I

LOAD

= 0.5A, MAX5035B 90

= 24V, I

LOAD

= 0.5A, MAX5035C 94Efficiency η

= 12V, V

OUT

= 5V, I

LOAD

= 0.5A,

MAX5035D

= 3.5V, V

= 7.5V to 76V, MAX5035A

270

440

= 5.5V, V

= 7.5V to 76V, MAX5035B

270

440

= 13V, V

= 15V to 76V, MAX5035C

270

440

Quiescent Supply Current I

= 1.3V, MAX5035D

270

440

µA

Shutdown Current I

SHDN

ON/OFF

= 0V, V

= 7.5V to 76V 10 45 µA

Peak Switch Current Limit I

LIM

(Note 1)

1.30 1.80 2.50

Switch Leakage Current I

= 76V, V

ON/OFF

= 0V, V

= 0V 1 µA

Switch On-Resistance

(

)

SWITCH

= 1A

0.40 0.80

Ω

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