Rainbow-electronics MAX1709 Bedienungsanleitung PDF herunterladen

General Description

The MAX1709 sets a new standard of space savings for

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

to 20W 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 pushbut-

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

The MAX1709 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 10A. For a device with a lower current

rating, smaller size, and lower cost, refer to the

MAX1708 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 10A Power MOSFET

♦ 5V, 4A 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)

MAX1709

4A, Low-Noise, High-Frequency,

Step-Up DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

ONA ONB

CLK

3.3/5

PGND

OUT

TOP VIEW

MAX1709

NARROW SO

SS/LIM

GND

REF

GND

Pin Configuration

ONA

REF

SS/LIM

CLK

OUTPUT

3.3V, 5V,

OR ADJ

UP TO 4A

OUT

GND

1µH

OFF

INPUT

1V TO 5V

SYNC

INTERNAL

MAX1709

Typical Operating Circuit

19-1724; Rev 0; 5/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1709ESE -40°C to +85°C 16 Narrow SO

1 2 3 4 5 6 ... 11 12

Step-Up DC-DC Converter 1

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Seite 1 - Step-Up DC-DC Converter

General DescriptionThe MAX1709 sets a new standard of space savings forhigh-power, step-up DC-DC conversion. It delivers upto 20W at a fixed (3.3V or

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MAX17094A, Low-Noise, High-Frequency, Step-Up DC-DC ConverterMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely

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

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MAX17094A, Low-Noise, High-Frequency, Step-Up DC-DC Converter_______________________________________________________________________________________ 9

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Rainbow-electronics MAX1709 Bedienungsanleitung

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