Rainbow-electronics MAX679 User Manual download pdf

_______________General Description

The MAX679 step-up, regulated charge pump gener-

ates a 3.3V ±4% output voltage from a 1.8V to 3.6V

input voltage (two alkaline, NiCd, or NiMH; or one

Lithium-Ion battery). Output current is 20mA (min) from

a 2.0V input. Only three external capacitors are needed

to build a complete DC-DC converter.

The MAX679’s switching frequency is pin selectable at

330kHz or 1MHz to allow trade-offs between lowest

supply current and smallest-size capacitors. The logic

shutdown function reduces the supply current to 5µA

(max) and disconnects the load from the input. Special

soft-start circuitry prevents excessive current from

being drawn from the battery during start-up. This DC-

DC converter requires no inductors and has low EMI. It

is available in the ultra-small µMAX package, which is

only 1.11mm high and half the area of an 8-pin SO.

________________________Applications

Battery-Powered Applications

Miniature Equipment

Backup-Battery Boost Converters

Translators

Two-Way Pagers

____________________________Features

♦ Regulated 3.3V ±4% Output

♦ Ultra-Small:

1.1mm-High, 8-Pin µMAX Package

♦ No Inductors Required

♦ Up to 1MHz Operation

(small external components)

♦ Fits into 0.05 in.

♦ Up to 85% Efficiency

♦ 1.8V to 3.6V Input Voltage Range

♦ 50µA Quiescent Supply Current

♦ 1µA Shutdown Current

MAX679

Regulated 3.3V Charge Pump

________________________________________________________________

Maxim Integrated Products

C1-

PGND

GND

OUT

C1+

SHDN

FSET

µMAX

TOP VIEW

MAX679

__________________Pin Configuration

MAX679

OUT

C1+

C1-

OFF/ON

FSET

SHDN

INPUT

2V to 3.6V

OUTPUT

3.3V, 20mA

OUT

GND

PGND

__________Typical Operating Circuit

19-1217; Rev 0; 4/97

PART

MAX679C/D 0°C to +70°C

TEMP. RANGE PIN-PACKAGE

Dice*

______________Ordering Information

Dice are tested at T

= +25°C only.

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

MAX679EUA -40°C to +85°C 8 µMAX

1 2 3 4 5 6

Regulated 3.3V Charge Pump 1

Summary of Contents

Page 1 - Regulated 3.3V Charge Pump

_______________General DescriptionThe MAX679 step-up, regulated charge pump gener-ates a 3.3V ±4% output voltage from a 1.8V to 3.6Vinput voltage (two

Page 2

MAX679Regulated 3.3V Charge Pump2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECT

Page 3

MAX679Regulated 3.3V Charge Pump_______________________________________________________________________________________30EFFICIENCY vs. OUTPUT CURRENT

Page 4

MAX679Regulated 3.3V Charge Pump4 ___________________________________________________________________________________________________________________T

Page 5

MAX679Regulated 3.3V Charge Pump_______________________________________________________________________________________ 5P6IN OUTP5P4ΦSWP3ΦTΦCP2PGNDC1

Page 6

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

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Rainbow-electronics MAX679 User Manual

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