Rainbow-electronics MAX1790 Manual de usuario descargar pdf

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

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

General Description

The MAX1790 boost converter incorporates high-perfor-

mance (at 1.2MHz), current-mode, fixed-frequency, pulse-

width modulation (PWM) circuitry with a built-in 0.21Ω

N-channel MOSFET to provide a highly efficient regulator

with fast response.

High switching frequency (640kHz or 1.2MHz selectable)

allows easy filtering and faster loop performance. An

external compensation pin provides the user flexibility in

determining loop dynamics, allowing the use of small, low

equivalent series resistance (ESR) ceramic output capaci-

tors. The device can produce an output voltage as high as

12V from an input as low as 2.6V.

Soft-start is programmed with an external capacitor, which

sets the input current ramp rate. In shutdown mode, cur-

rent consumption is reduced to 0.1µA. The MAX1790 is

available in a space-saving 8-pin µMAX package. The

ultra-small package and high switching frequency allow

the total solution to be less than 1.1mm high.

Applications

LCD Displays

PCMCIA Cards

Portable Applications

Hand-Held Devices

Features

♦ 90% Efficiency

♦ Adjustable Output from V

to 12V

♦ 1.6A, 0.21Ω, 14V Power MOSFET

♦ +2.6V to +5.5V Input Range

♦ Pin-Selectable 640kHz or 1.2MHz Switching

Frequency

♦ 0.1µA Shutdown Current

♦ Programmable Soft-Start

♦ Small 8-Pin µMAX Package

MAX1790

Low-Noise Step-Up DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

LXGND

FREQFB

COMP

µMAX

TOP VIEW

MAX1790

SHDN

2.6V TO 5V

GND

FREQ

OUT

COMP

SHDN

MAX1790

ON/OFF

Typical Operating Circuit

19-1563; Rev 0a; 1/00

PART

MAX1790EUA -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 µMAX

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Pin Configuration

Ordering Information

1 2 3 4 5 6 ... 11 12

Indice de contenidos

Pagina 1 - FOLLOWS DATA SHEET

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,or visit Maxim’s website at www.maxim-ic.com.General Des

Pagina 2 - ELECTRICAL CHARACTERISTICS

MAX1790for secondary outputs (V2 and V3) depends on the loadcharacteristics of all three outputs.Layout ProcedureGood PC board layout and routing are

Pagina 3

MAX1790Low-Noise Step-Up DC-DC Converter______________________________________________________________________________________ 11Figure 4. Multiple-Ou

Pagina 4 - = 3.3V, f

MAX1790Low-Noise Step-Up DC-DC Converter12 ______________________________________________________________________________________Package Information8L

Pagina 5

MAX1790Low-Noise Step-Up DC-DC Converter2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATI

Pagina 6

MAX1790Low-Noise Step-Up DC-DC Converter_______________________________________________________________________________________ 3ELECTRICAL CHARACTERI

Pagina 7 - Shutdown

MAX1790Low-Noise Step-Up DC-DC Converter4 _______________________________________________________________________________________Typical Operating Cha

Pagina 8 - Diode Selection

MAX1790Low-Noise Step-Up DC-DC Converter_______________________________________________________________________________________ 52ms/divSTARTUP WAVEFO

Pagina 9 - Application Circuits

Detailed DescriptionThe MAX1790 is a highly efficient power supply thatemploys a current-mode, fixed-frequency pulse-widthmodulation (PWM) architectur

Pagina 10 - Layout Procedure

MAX1790Low-Noise Step-Up DC-DC Converter_______________________________________________________________________________________ 7Output Current Capabi

Pagina 11

External component value choice is primarily dictatedby the output voltage and the maximum load current,as well as maximum and minimum input voltages.

Pagina 12 - 8LUMAXD.EPS

MAX1790Low-Noise Step-Up DC-DC Converter_______________________________________________________________________________________ 9breakdown voltage exc

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Rainbow-electronics MAX1790 Manual de usuario

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