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MAX878CPA

更新时间： 2024-11-10 22:55:11

品牌	Logo	应用领域
美信 - MAXIM		转换器
页数	文件大小	规格书
12页	130K
描述
5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters

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中文翻译

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数据手册

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MAX878CPA 数据手册

19-0204; Rev 1; 5/94

5 V/3 .3 V/3 V/Ad ju s t a b le -Ou t p u t ,

S t e p -Up /S t e p -Do w n DC-DC Co n ve rt e rs

/MAX879

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

____________________________Fe a t u re s

♦ Regulates from Inputs Above & Below the Output

♦ 1V to 6.2V Supply-Voltage Range

The MAX877/MAX878/MAX879 are pulse-skipping, step-

up/step-down DC-DC converters that provide a regulated

output from inputs both above and below the output. They

require only three external components—an inductor

(typically 22µH) and two filter capacitors.

♦ Internal 1A Active Rectifier with Input-to-Output

Disconnect in Shutdown

The MAX877 delivers a regulated 5V output from 2.5V to

6.2V inputs. The MAX878 generates pin-selectable volt-

ages of 3.0V or 3.3V from 1.5V to 6.2V inputs. The MAX879

output can be adjusted from 2.5V to 6V via an external

resistor divider from 2.5V to 6.2V inputs.

♦ Up to 210mA Load Currents, Guaranteed

♦ 85% Efficiency

♦ Only 3 External Components

♦ Adjustable Current Limit

A unique high-power, internal, synchronous rectifier design

(Active Rectifier™) enables the devices to regulate in a

switched linear mode if the input voltage is higher than the

desired output voltage. When the input voltage falls below

the output voltage, the MAX877/MAX878/MAX879 will

smoothly switch into a pulse-skipping boost mode and

step up from input voltages as low as 1V. In shutdown, the

active rectifier disconnects the output from the source. This

stops the current drain from input to output associated with

conventional step-up converters.

♦ 195µA Quiescent Supply Current

♦ 20µA Shutdown Supply Current

♦ 3V/3.3V/5V and Adjustable Output Voltage Versions

♦ Available in 8-Pin DIP and SO Packages

______________Ord e rin g In fo rm a t io n

PART

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

8 Plastic DIP

8 SO

High-frequency operation (up to 300kHz) allows the use of

small surface-mount inductors. Supply current is 195µA

under no load, and only 20µA in shutdown mode. For 1-cell

(1V) step-up converters with similar performance and the

same pinout, refer to the MAX777/MAX778/MAX779 data

sheet.

MAX877CPA

MAX877CSA

MAX877C/D

MAX877EPA

MAX877ESA

MAX877MJA

0°C to +70°C

Dice*

-40°C to +85°C

-55°C to +125°C

8 Plastic DIP

8 SO

________________________Ap p lic a t io n s

Two or Three NiCd Cells to 3V/3.3V Conversion

Three or Four Alkaline Cells to 5V Conversion

One Lithium Cell to 3V/3.3V Conversion

Pagers

8 CERDIP

Ordering Information continued on last page.

* Contact factory for dice specifications.

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

Palmtop and Notebook Computers

Battery-Powered and Hand-Held Instruments

INPUT

1.8V TO 6.2V

__________________P in Co n fig u ra t io n

TOP VIEW

22µF

22µH

MAX878

ILIM

SHDN

ILIM

N.C. (MAX877)

OUTPUT

3.3V

SHDN

210mA

MAX877

MAX878

MAX879

ON/OFF

OUT

AGND

PGND

OUT

100µF

SEL

AGND

PGND

DIP/SO

* SEL (MAX878), FB (MAX879)

™ Active Rectifier is a trademark of Maxim Integrated Products.

________________________________________________________________ Maxim Integrated Products

Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .

12 3 4 5 6 7...12

中文翻译

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与MAX878CPA相关器件

型号	品牌	获取价格	描述	数据表
MAX878CSA	MAXIM	获取价格	5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters
MAX878EPA	MAXIM	获取价格	5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters
MAX878ESA	MAXIM	获取价格	5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters
MAX878LCPA	MAXIM	获取价格	Analog IC
MAX878LCSA	MAXIM	获取价格	Analog IC
MAX878LEPA	MAXIM	获取价格	Analog IC
MAX878LESA	MAXIM	获取价格	Analog IC
MAX878LMJA	MAXIM	获取价格	Analog IC
MAX878MJA	MAXIM	获取价格	5V/3.3V/3V/Adjustable-Output, Step-Up/Step-Down DC-DC Converters
MAX8790	MAXIM	获取价格	Six-String White LED Driver with Active Current Balancing for LCD Panel Applications

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