Datasheet > MAX868

MAX868

更新时间： 2023-12-20 18:45:00

品牌	Logo	应用领域
亚德诺 - ADI		泵
页数	文件大小	规格书
12页	152K
描述
稳压型、可调节、-2倍压反相电荷泵

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数据手册

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MAX868 数据手册

19-1290; Rev 1; 2/98

Re g u la t e d , Ad ju s t a b le -2 x

In ve rt in g Ch a rg e P u m p

MAX68

Ge n e ra l De s c rip t io n

____________________________Fe a t u re s

The MAX868 inverting charge pump provides a low-cost

and compact means of generating a regulated negative

♦ Regulated Negative Output Voltage

(up to -2 x V )

voltage up to -2 x V from a positive input voltage

♦ Ultra-Small, 10-Pin µMAX Package

♦ On-Demand Switching at up to 450kHz

♦ 30µA Quiescent Supply Current

♦ Requires Only Four Small External Capacitors

♦ 1.8V to 5.5V Input Voltage Range

♦ 0.1µA Logic-Controlled Shutdown

♦ Up to 30mA Output Current

between 1.8V and 5.5V. It uses a pulse-frequency-

modulation (PFM) control scheme to generate the regulat-

ed negative output voltage. PFM operation is obtained

by gating the internal 450kHz oscillator on and off as

ne e d e d to ma inta in outp ut volta g e re g ula tion. This

unique on-demand switching scheme gives the MAX868

excellent light-load efficiency without degrading its full-

load operation (up to 30mA), permitting smaller capaci-

tors to take advantage of the oscillator’s high switching

frequency.

The MAX868 requires no inductors; only four capacitors

are required to build a complete DC-DC converter.

Output voltage regulation is achieved by adding just two

resistors. The MAX868 comes in a 10-pin µMAX pack-

age, which is only 1.11mm high and occupies just half

the board area of a standard 8-pin SO.

Ord e rin g In fo rm a t io n

PART

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

Dice*

________________________Ap p lic a t io n s

Small LCD Panels

MAX868C/D

MAX868EUB

-40°C to +85°C

10 µMAX

*Dice are tested at T = +25°C.

Cell Phones

Cordless Phones

Camcorders

Handy-Terminals, PDAs

Medical Instruments

Typ ic a l Op e ra t in g Circ u it

Battery-Operated Equipment

V = 1.8V TO 5.5V

Co n fig u ra t io n

1µF

SHDN

C1+

TOP VIEW

MAX868

GND

OUT

C1-

10 FB

0.1µF

SHDN

C1-

MAX868

OUT

= 0V TO -2 x V

C2+

OUT

PGND

C1+

2.2µF

C2-

PGND GND

µMAX

________________________________________________________________ Maxim Integrated Products

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

For small orders, phone 408-737-7600 ext. 3468.

12 3 4 5 6 7...12

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