Rainbow-electronics MAX1708 Instrukcja Użytkownika Pobierz pdf (Strona 1)

General Description

The MAX1708 sets a new standard of space savings for

high-power, step-up DC-DC conversion. It delivers up

to 10W at a fixed (3.3V or 5V) or adjustable (2.5V to

5.5V) output, using an on-chip power MOSFET from a

+0.7V to +5V supply.

Fixed-frequency PWM operation ensures that the

switching noise spectrum is constrained to the 600kHz

fundamental and its harmonics, allowing easy postfilter-

ing for noise reduction. External clock synchronization

capability allows for even tighter noise spectrum con-

trol. Quiescent power consumption is less than 1mW to

extend operating time in battery-powered systems.

Two control inputs (ONA, ONB) allow simple push-on,

push-off control through a single momentary push-but-

ton switch, as well as conventional on/off logic control.

The MAX1708 also features programmable soft-start

and current limit for design flexibility and optimum per-

formance with batteries. The maximum RMS switch cur-

rent rating is 5A. For a device with a higher (10A)

switch current rating, refer to the MAX1709 data sheet.

________________________Applications

Routers, Servers, Workstations, Card Racks

Local 2.5V to 3.3V or 5V Conversion

Local 3.3V to 5V Conversion

3.6V or 5V RF PAs in Communications Handsets

Features

♦ On-Chip 5A Power MOSFET

♦ 5V, 2A Output from a 3.3V Input

♦ Fixed 3.3V or 5V Output Voltage or

Adjustable (2.5V to 5.5V)

♦ Input Voltage Range Down to 0.7V

♦ Low Power Consumption

1mW Quiescent Power

1µA Current in Shutdown Mode

♦ Low-Noise, Constant Frequency Operation

(600kHz)

♦ Synchronizable Switching Frequency

(350kHz to 1000kHz)

♦ Small QSOP Package

MAX1708

High-Frequency, High-Power, Low-Noise,

Step-Up DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

ONB CLK

3.3/5

PGND

OUT

GND

TOP VIEW

MAX1708

QSOP

ONA

GND

SS/LIM

REF

Pin Configuration

ONA

REF

SS/LIM

CLK

OUTPUT

3.3V, 5V,

OR ADJ

UP TO 2A

OUT

GND

2.2µH

OFF

INPUT

1V TO 5V

SYNC

INTERNAL

MAX1708

Typical Operating Circuit

19-2068; Rev 0; 7/01

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1708EEE -40°C to +85°C 16 QSOP

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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Step-Up DC-DC Converter 1

Podsumowanie treści

Strona 1 - Step-Up DC-DC Converter

General DescriptionThe MAX1708 sets a new standard of space savings forhigh-power, step-up DC-DC conversion. It delivers upto 10W at a fixed (3.3V or

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter10 _______________________________________________________________________________

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter__________________________________________________________________________________

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter12 _______________________________________________________________________________

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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter2 ________________________________________________________________________________

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter__________________________________________________________________________________

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Note 1: Output voltage is specified at 0.5A switch current ISW, which is equivalent to approximately 0.5A ✕(VIN/ VOUT) of load cur-rent.Note 2: Load r

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter__________________________________________________________________________________

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter6 ________________________________________________________________________________

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter__________________________________________________________________________________

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter8 ________________________________________________________________________________

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MAX1708High-Frequency, High-Power, Low-Noise,Step-Up DC-DC Converter__________________________________________________________________________________

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