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MAX5025

500kHz, 36V Output, SOT23, PWM Step-Up DC-DC Converters

Maxim Integrated 

19-2239; Rev 2; 3/09

EVAALVUAAILTAIOBNLEKIT

500kHz, 36V Output, SOT23,

PWM Step-Up DC-DC Converters

General Description

The MAX5025–MAX5028 constant-frequency, pulse-

width modulating (PWM), low-noise boost converters

are intended for low-voltage systems that often need a

locally generated high voltage. These devices are

capable of generating low-noise, high output voltages

required for varactor diode biasing in TV tuners, set-top

boxes, and PCI cable modems. The MAX5025–

MAX5028 operate from as low as 3V and switch at

500kHz.

The constant-frequency, current-mode PWM architec-

ture provides for low output noise that is easy to filter. A

40V lateral DMOS device is used as the internal power

switch, making the devices ideal for boost converters

up to 36V. The MAX5025/MAX5026 adjustable versions

require the use of external feedback resistors to set the

output voltage. The MAX5027/MAX5028 offer a fixed

30V output. These devices are available in a small, 6-

pin SOT23 package.

Applications

TV Tuner Power Supply

Low-Noise Varactor Diode Biasing

Set-Top Box Tuner Power Supply

PCI Cable Modem

Voice-Over-Cable

LCD Power Supply

Avalanche Photodiode Biasing

Features

♦ Input Voltage Range:

3V to 11V (MAX5026/MAX5028)

4.5V to 11V (MAX5025/MAX5027)

♦ Wide Output Voltage Range: VCC to 36V

♦ Output Power: 120mW (max)

♦ User-Adjustable Output Voltage with

MAX5025/MAX5026 Using External Feedback

Resistors

♦ Fixed 30V Output Voltage: MAX5027/MAX5028

♦ Internal 1.3Ω (typ), 40V Switch

♦ Constant PWM Frequency Provides Easy Filtering

in Low-Noise Applications

♦ 500kHz (typ) Switching Frequency

♦ 1μA (max) Shutdown Current

♦ Small, 6-Pin SOT23 Package

PA RT

MAX5025EUT-T

MAX5026EUT-T

MAX5027EUT-T

MAX5028EUT-T

Ordering Information

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

PIN-PACKAGE

6 SOT23-6

6 SOT23-6

6 SOT23-6

6 SOT23-6

Typical Operating Circuit

VCC = 4.5V TO 11V

(MAX5027)

VCC = 3V TO 11V

(MAX5028)

L1

D1

VCC

LX

MAX5027

MAX5028

SHDN

FB

C1

PGND

GND

VOUT

30V

C2

Selector Guide appears at end of data sheet.

Pin Configuration

TOP VIEW

PGND 1

6 LX

MAX5025–

GND 2 MAX5028 5 VCC

FB 3

4 SHDN

SOT23-6

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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