Rainbow-electronics MAX1701 Manual de usuario descargar pdf

General Description

The MAX1700/MAX1701 are high-efficiency, low-noise,

step-up DC-DC converters intended for use in battery-

powered wireless applications. They use a synchro-

nous-rectified pulse-width-modulation (PWM) boost

topology to generate 2.5V to 5.5V outputs from battery

inputs such as one to three NiCd/NiMH cells or one Li-

Ion cell. Both devices have an internal 1A, 130mΩ N-

channel MOSFET switch and a 250mΩ P-channel

synchronous rectifier.

With their internal synchronous rectifier, the MAX1700/

MAX1701 deliver 5% better efficiency than similar non-

synchronous converters. They also feature a pulse-

frequency-modulation (PFM) standby mode to improve

efficiency at light loads, and a 3µA shutdown mode.

The MAX1700/MAX1701 come in 16-pin QSOP pack-

ages (which occupy the same space as an 8-pin SO).

The MAX1701 includes two comparators to generate

power-good and low-battery warning outputs. It also

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

regulator using an external P-channel pass device.

For higher-power outputs, refer to the MAX1703. For

dual outputs (step-up and linear regulator), refer to the

MAX1705/MAX1706. For an on-board analog-to-digital

converter, refer to the MAX848/MAX849.

The MAX1701 evaluation kit is available to speed design

time.

Applications

Digital Cordless Phones Personal Communicators

PCS Phones Palmtop Computers

Wireless Handsets Hand-Held Instruments

Two-Way Pagers

Features

♦ Up to 96% Efficiency

♦ 1.1 V

Guaranteed Start-Up

♦ 0.7V to 5.5V Input Range

♦ Up to 800mA Output

♦ Step-Up Output (adjustable from 2.5V to 5.5V)

♦ PWM/PFM Synchronous-Rectified Topology

♦ External Clock or Internal 300kHz Oscillator

♦ 3µA Logic-Controlled Shutdown

♦ Power-Good Output (MAX1701)

♦ Low-Battery Comparator (MAX1701)

♦ Uncommitted Gain Block (MAX1701)

MAX1700/MAX1701

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

Low-Noise, Step-Up DC-DC Converters

________________________________________________________________

Maxim Integrated Products

PGNDGNDFB

ONA

REF

ONB

POUT

OUT

INPUT

0.7V TO 5.5V

OFF

SYNC

PWM

PFM

OUTPUT

3.3V OR ADJ

UP TO 800mA

CLK/SEL

MAX1700

Pin Configurations

TOP VIEW

I.C. I.C.

POUT

OUT

PGND

I.C.

I.C. = INTERNAL CONNECTION. LEAVE OPEN OR CONNECT TO GND

MAX1700

QSOP

I.C.

REF

I.C.

CLK/SEL

GND

ONB

ONA

Typical Operating Circuit

19-4759; Rev 1; 1/99

PART

MAX1700EEE

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

MAX1701EEE

-40°C to +85°C 16 QSOP

Pin Configurations continued at end of data sheet.

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

MAX1700/MAX1701 1

Indice de contenidos

Pagina 1 - MAX1700/MAX1701

General DescriptionThe MAX1700/MAX1701 are high-efficiency, low-noise,step-up DC-DC converters intended for use in battery-powered wireless applicatio

Pagina 2

MAX1700/MAX1701Step-Up Converter The step-up switching DC-DC converter generates anadjustable output from 2.5V to 5.5V. During the first partof each c

Pagina 3

Synchronized PWM OperationBy applying an external clock to CLK/SEL, theMAX1700/MAX1701 can also be synchronized in PWMmode to a frequency between 200k

Pagina 4

MAX1700/MAX1701between the positive battery terminal and GND (Figure5). The resistor values are then calculated as follows:R3 = R4(VTH/VLBN-1)where VT

Pagina 5

Reference The MAX1700/MAX1701 have an internal 1.250V, 1%bandgap reference. Connect a 0.22µF bypass capaci-tor to GND within 0.2in. (5mm) of the REF p

Pagina 6

MAX1700/MAX1701Output DiodeUse a Schottky diode, such as a 1N5817, MBR0520L, orequivalent. The Schottky diode carries current duringstart-up, and in P

Pagina 7

low-noise power for DSP, control, and RF circuitry.Typically, RF phones spend most of their life in standbymode with only short periods in transmit/re

Pagina 8

MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters16 ______________________________________________________________

Pagina 9

MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters2 _______________________________________________________________

Pagina 10

Input High Voltage (Note 7)MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters______________________________________

Pagina 11

MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters4 _______________________________________________________________

Pagina 12

Input High Voltage (Note 7)MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters______________________________________

Pagina 13

MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters6 _______________________________________________________________

Pagina 14

MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters_________________________________________________________________

Pagina 15

MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters8 _______________________________________________________________

Pagina 16

MAX1700/MAX17011-Cell to 3-Cell, High-Power (1A), Low-Noise, Step-Up DC-DC Converters_________________________________________________________________

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Rainbow-electronics MAX1701 Manual de usuario

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