Rainbow-electronics MAX867 Manual de usuario descargar pdf

_______________General Description

The MAX866 and MAX867 are ultra-small, high-efficiency,

CMOS, step-up, DC-DC switching regulators for 1-cell

battery-powered systems. The MAX866 accepts a posi-

tive input voltage between 0.8V and V

OUT

and converts it

to a higher, pin-selectable output voltage of 3.3V or 5V.

The MAX867 adjustable version accepts 0.8V to 6.0V

input voltages and generates a higher adjustable output

voltage in the 2.7V to 6.0V range. Typical efficiencies are

greater than 80%. Typical no-load supply current is

100µA (1µA in shutdown).

The MAX866/MAX867 combine ultra-low quiescent sup-

ply current and high efficiency to give maximum battery

life. Its high switching frequency permits the use of

small, low-cost inductors and capacitors. Additionally,

internal peak-current limiting protects the IC.

________________________Applications

Pagers

Remote Controls

Detectors

1-Cell Battery-Operated Equipment

Backup Supplies

____________________________Features

♦ 0.8V to 6.0V Input Supply Voltage

♦ 0.9V Guaranteed Start-Up Supply Voltage

♦ >80% Efficiency Over Wide Load Range

♦ 100µA No-Load Battery Current (V

OUT

= 3.3V)

♦ 1µA Shutdown Mode

♦ Up to 250kHz Switching Frequency

♦ ±1.5% Reference Tolerance

♦ Low-Battery Detector (LBI/LBO)

♦ Available in Ultra-Small 8-Pin µMAX Package

(1.11mm high)

♦ Circuit Fits in 0.2in

______________Ordering Information

MAX866/MAX867

3.3V/5V or Adjustable-Output,

Single-Cell DC-DC Converters

________________________________________________________________

Maxim Integrated Products

GND

OUT

LBI

LBO

REF

3/5

SHDN

MAX866

SO/µMAX

TOP VIEW

GND

OUT

LBI

LBO

REF

SHDN

MAX867

SO/µMAX

_________________Pin Configurations

MAX866

SHDN

3/5

REF

GND

OUT

INPUT

0.8V TO V

OUT

MBRS0520LTI

OR 1N5817

OUTPUT

5V OR 3.3V

LBO

47µF

0.22µF

330µH

LOW-BATTERY

DETECTOR OUTPUT

ON/OFF

3V/5V SELECT

LBI

LOW-BATTERY

DETECTOR

INPUT

__________Typical Operating Circuit

19-0374; Rev 1; 5/96

PART TEMP. RANGE PIN-PACKAGE

MAX866C/D

0°C to +70°C Dice*

MAX866ESA -40°C to +85°C 8 SO

MAX867C/D

0°C to +70°C Dice*

MAX867ESA -40°C to +85°C 8 SO

* Dice are tested at T

= +25°C only.

EVALUATION KIT

AVAILABLE

MAX866EUA -40°C to +85°C 8 µMAX

MAX867EUA -40°C to +85°C 8 µMAX

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

1 2 3 4 5 6 ... 11 12

Indice de contenidos

Pagina 1 - Single-Cell DC-DC Converters

_______________General DescriptionThe MAX866 and MAX867 are ultra-small, high-efficiency,CMOS, step-up, DC-DC switching regulators for 1-cellbattery-p

Pagina 2

MAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters10 ____________________________________________________________________________

Pagina 3

tolerate higher output ripple. Values in the 10µF to 47µFrange are recommended.The equivalent series resistance (ESR) of both bypassand filter capacit

Pagina 4

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Pagina 5

VMAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters2 ____________________________________________________________________________

Pagina 6

MAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters_______________________________________________________________________________

Pagina 7

MAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters4 _____________________________________________________________________________

Pagina 8

MAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters_______________________________________________________________________________

Pagina 9

MAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters6 _____________________________________________________________________________

Pagina 10

_______________Detailed DescriptionOperating PrincipleThe MAX866/MAX867 combine a switch-mode regula-tor, N-channel power MOSFET, precision voltage re

Pagina 11

MAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters8 _____________________________________________________________________________

Pagina 12

MAX866/MAX8673.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters_______________________________________________________________________________

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Rainbow-electronics MAX867 Manual de usuario

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