Rainbow-electronics MAX863 User Manual download pdf

_______________General Description

The MAX863 dual-output DC-DC converter contains

two independent step-up controllers in a single com-

pact package. This monolithic Bi-CMOS design draws

only 85µA when both controllers are on. The input

range extends down to 1.5V, permitting use in organiz-

ers, translators, and other low-power hand-held prod-

ucts. The MAX863 provides 90% efficiency at output

loads from 20mA to over 1A. This space-saving device

is supplied in a 16-pin QSOP package that fits in the

same area as an 8-pin SOIC.

The device uses a current-limited, pulse-frequency-

modulated (PFM) control architecture that reduces start-

up surge currents and maintains low quiescent currents

for excellent low-current efficiency. Each controller

drives a low-cost, external, N-channel MOSFET switch,

whose size can be optimized for any output current or

voltage.

In larger systems, two MAX863s can be used to gener-

ate 5V, 3.3V, 12V, and 28V from just two or three bat-

tery cells. An evaluation kit (MAX863EVKIT) is available

to speed designs. For a single-output controller, refer to

the MAX608 and MAX1771 data sheets.

________________________Applications

2- and 3-Cell Portable Equipment

Organizers

Translators

Hand-Held Instruments

Palmtop Computers

Personal Digital Assistants (PDAs)

Dual Supply (Logic and LCD)

____________________________Features

♦ Smallest Dual Step-Up Converter: 16-Pin QSOP

♦ 90% Efficiency

♦ 1.5V Start-Up Voltage

♦ 85µA Max Total Quiescent Supply Current

♦ 1µA Shutdown Mode

♦ Independent Shutdown Inputs

♦ Drives Surface-Mount, Dual N-Channel MOSFETs

♦ Low-Battery Input/Output Comparator

♦ Step-Up/Down Configurable

MAX863

Dual, High-Efficiency, PFM, Step-Up

DC-DC Controller

________________________________________________________________ Maxim Integrated Products 1

MAX863

EXT2

CS2

OUT2

OUT1

ON/OFF

FB2

SHDN1

EXT1

CS1

LBO

LOW-BATTERY

DETECTOR OUTPUT

LBI

SENSE1 V

PGND

BOOT

GND

FB1

SHDN2

REF

__________________Pin Configuration

SENSE1 REF

SHDN2

LBI

LBO

FB2

SHDN1

CS2

EXT2

TOP VIEW

MAX863

QSOP

FB1

EXT1

BOOT

CS1

GND

PGND

__________Typical Operating Circuit

19-1218; Rev 2; 2/98

PART

MAX863C/D

MAX863EEE -40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

Dice*

16 QSOP

EVALUATION KIT MANUAL

AVAILABLE

______________Ordering Information

*Dice are tested at T

= +25°C.

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.

1 2 3 4 5 6 ... 15 16

DC-DC Controller 1

Summary of Contents

Page 1 - DC-DC Controller

_______________General DescriptionThe MAX863 dual-output DC-DC converter containstwo independent step-up controllers in a single com-pact package. Thi

Page 2

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller10 ______________________________________________________________________________________Shut

Page 3

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller______________________________________________________________________________________ 11mini

Page 4

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller12 ______________________________________________________________________________________Sele

Page 5

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller______________________________________________________________________________________ 13Volt

Page 6

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller14 ______________________________________________________________________________________Set

Page 7

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller______________________________________________________________________________________ 15MAX8

Page 8

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller16 __________________________________________________________________________________________

Page 9

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller2 _______________________________________________________________________________________ABSO

Page 10

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller_______________________________________________________________________________________ 3ELEC

Page 11

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller4 ___________________________________________________________________________________________

Page 12

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller_______________________________________________________________________________________ 5____

Page 13

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller6 _______________________________________________________________________________________The

Page 14

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller_______________________________________________________________________________________ 7Cont

Page 15

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller8 _______________________________________________________________________________________MAX8

Page 16

MAX863Dual, High-Efficiency, PFM, Step-UpDC-DC Controller_______________________________________________________________________________________ 9Low-

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Rainbow-electronics MAX863 User Manual

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