Rainbow-electronics MAX8715 Bedienungsanleitung PDF herunterladen (Seite 1)

General Description

The MAX1790/MAX8715 boost converters incorporate

high-performance (at 1.2MHz), current-mode, fixed-fre-

quency, pulse-width modulation (PWM) circuitry with a

built-in 0.21Ω/0.15Ω n-channel MOSFET to provide a high-

ly 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/

MAX8715 are available in a space-saving 8-pin µMAX

package. The ultra-small package and high switching fre-

quency 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 (MAX1790)

♦ 2.4A, 0.15Ω, 14V Power MOSFET (MAX8715)

♦ +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/MAX8715

Low-Noise Step-Up DC-DC Converters

________________________________________________________________ Maxim Integrated Products 1

LXGND

FREQFB

COMP

µMAX

TOP VIEW

MAX1790

MAX8715

SHDN

2.6V TO 5V

GND

FREQ

OUT

COMP

SHDN

MAX1790

MAX8715

ON/OFF

Typical Operating Circuit

19-1563; Rev 2; 5/04

Pin Configuration

Ordering Information

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX1790EUA -40°C to +85°C 8 µMAX

MAX8715EUA -40°C to +85°C 8 µMAX

µMAX is a registered trademark of Maxim Integrated Products,

Inc.

1 2 3 4 5 6 ... 13 14

MAX1790/MAX8715 1

Inhaltsverzeichnis

Seite 1 - MAX1790/MAX8715

General DescriptionThe MAX1790/MAX8715 boost converters incorporatehigh-performance (at 1.2MHz), current-mode, fixed-fre-quency, pulse-width modulatio

Seite 2

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters10 ______________________________________________________________________________________components f

Seite 3

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters______________________________________________________________________________________ 11ratio of ind

Seite 4

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters12 ______________________________________________________________________________________R2 can have

Seite 5

AMLCD ApplicationFigure 4 shows a power supply for active matrix (TFT-LCD) flat-panel displays. Output-voltage transient per-formance is a function of

Seite 6

MAX1790/MAX8715Low-Noise Step-Up DC-DC ConvertersMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in

Seite 7

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters2 _______________________________________________________________________________________ABSOLUTE MAX

Seite 8

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters_______________________________________________________________________________________ 3ELECTRICAL C

Seite 9

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters4 _______________________________________________________________________________________ELECTRICAL C

Seite 10

Typical Operating Characteristics(Circuit of Figure 1, VIN= 3.3V, fOSC= 640kHz, TA= +25°C, unless otherwise noted.)MAX1790 toc01501100010010MAX1790 EF

Seite 11

500mA20mACH1 = LOAD CURRENT, 500mA/divCH2 = OUTPUT VOLTAGE, AC-COUPLED, 200mV/divCH3 = INDUCTOR CURRENT, 1A/divVOUT = 5V, fOSC = 640kHz, COUT = 47µF +

Seite 12

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters_______________________________________________________________________________________ 72ms/divSTART

Seite 13

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters8 _______________________________________________________________________________________Detailed Des

Seite 14

MAX1790/MAX8715Low-Noise Step-Up DC-DC Converters_______________________________________________________________________________________ 9Output-Curre

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Rainbow-electronics MAX8715 Bedienungsanleitung Seite 1

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Rainbow-electronics MAX8715 Bedienungsanleitung Seite 1

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