Rainbow-electronics MAX1703 Bedienungsanleitung PDF herunterladen

________________General Description

The MAX1703 is a high-efficiency, low-noise, step-up

DC-DC converter intended for use in battery-powered

wireless applications. It uses a synchronous-rectified

pulse-width-modulation (PWM) boost topology to gen-

erate a 2.5V to 5.5V output from battery inputs, such as

one to three NiCd/NiMH cells or one Li-Ion cell. The

device includes a 2A, 75mΩ, N-channel MOSFET

switch and a 140mΩ, P-channel synchronous rectifier.

With its internal synchronous rectifier, the MAX1703

delivers up to 5% better efficiency than similar nonsyn-

chronous converters. It also features a pulse-frequency-

modulation (PFM) low-power mode to improve efficiency

at light loads, and a 1µA shutdown mode.

The MAX1703 comes in a 16-pin narrow SO package

and includes an uncommitted comparator that generates

a power-good or low-battery-warning output. It also

contains a linear gain block that can be used to build a

linear regulator.

For lower-power outputs and a smaller package, refer

to the MAX1700/MAX1701. For dual outputs (step-up

plus linear regulator), refer to the MAX1705/MAX1706.

For an on-board analog-to-digital converter, refer to the

MAX848/MAX849.

The MAX1703 evaluation kit is available to speed designs.

____________________________Features

♦ Up to 95% Efficiency

♦ Up to 1.5A Output

♦ Fixed 5V or Adjustable Step-Up Output

(2.5V to 5.5V)

♦ 0.7V to 5.5V Input Range

♦ Low-Power Mode (300µW)

♦ Low-Noise, Constant-Frequency Mode (300kHz)

♦ Synchronizable Switching Frequency

(200kHz to 400kHz)

♦ 1µA Logic-Controlled Shutdown

♦ Power-Good Comparator

♦ Uncommitted Gain Block

________________________Applications

Digital Cordless Phones Personal Communicators

PCS Phones Palmtop Computers

Wireless Handsets Hand-Held Instruments

Two-Way Pagers

MAX1703

1-Cell to 3-Cell, High-Power (1.5A),

Low-Noise, Step-Up DC-DC Converter

________________________________________________________________

Maxim Integrated Products

19-1336; Rev 2; 11/98

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

Typical Operating Circuit

PART TEMP. RANGE

PIN-PACKAGE

MAX1703ESE -40°C to +85°C 16 Narrow SO

PGNDGNDFB

POUT

OUT

LXP, LXN

OFF

INPUT

0.7V TO 5.5V

SYNC

PWM

PFM

OUTPUT

5V OR ADJ

UP TO 1.5A

CLK/

SEL

POKIN

POK

AIN

REF

POWER-GOOD

INPUT

POWER-GOOD

OUTPUT

GAIN-BLOCK INPUT

GAIN-BLOCK

OUTPUT

MAX1703

Pin Configuration

REF ON

POUT

LXP

POUT

PGND

LXN

PGND

CLK/SEL

TOP VIEW

MAX1703

Narrow SO

POKIN

AIN

OUT

GND

POK

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

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

1 2 3 4 5 6 ... 15 16

Inhaltsverzeichnis

Seite 1 - Maxim Integrated Products

________________General DescriptionThe MAX1703 is a high-efficiency, low-noise, step-upDC-DC converter intended for use in battery-poweredwireless app

Seite 2 - ELECTRICAL CHARACTERISTICS

MAX1703Synchronized PWM OperationThe MAX1703 can be synchronized in PWM mode to a200kHz to 400kHz frequency by applying an externalclock to CLK/SEL. T

Seite 3

ShutdownThe MAX1703 shuts down to reduce quiescent currentto 1µA. During shutdown (ON = VOUT), the reference,low-battery comparator, gain block, and a

Seite 4

MAX1703__________________Design ProcedureSetting the Output VoltagesSet the output voltage between 2.5V and 5.5V by con-necting a resistor voltage-div

Seite 5 - = +3.6V, V

Bypass CapacitorsA few ceramic bypass capacitors are required for properoperation. Bypass REF with a 0.22µF capacitor to GND.Connect a 0.22µF ceramic

Seite 6

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter14 ______________________________________________________________________

Seite 7 - Pin Description

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter_________________________________________________________________________

Seite 8

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter16 ______________________________________________________________________

Seite 9 - Step-Up Converter

Switch On-ResistanceMAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter2 ___________________________________________________

Seite 10 - Low-Power PFM Operation

VMAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter________________________________________________________________________

Seite 11 - Gain Block

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter4 _______________________________________________________________________

Seite 12 - Table 4. Component Suppliers

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter_________________________________________________________________________

Seite 13

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter6 _______________________________________________________________________

Seite 14 - TRANSISTOR COUNT: 554

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter_________________________________________________________________________

Seite 15 - SOICN.EPS

MAX17031-Cell to 3-Cell, High-Power (1.5A),Low-Noise, Step-Up DC-DC Converter8 _______________________________________________________________________

Seite 16

Table 1. Typical Available Output CurrentAdditional features include synchronous rectification forhigh efficiency and improved battery life, and anunc

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