MAX778L

更新时间： 2024-11-03 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	119K
描述
Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters

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MAX778L 数据手册

19-0186; Rev 2; 7/96

Lo w -Vo lt a g e In p u t , 3 V/3 .3 V/5 V/

Ad ju s t a b le Ou t p u t , S t e p -Up DC-DC Co n ve rt e rs

8/MAX79L

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

____________________________Fe a t u re s

♦ 1V to 4.5V Input Guarantees Start-Up Under Load

♦ Up to 210mA Output

The MAX777L/MAX778L/MAX779L are pulse-skipping DC-DC

converters that step up from low-voltage inputs (1V guaran-

teed). They require only three external components—an induc-

tor (typically 22µH) and two capacitors. The MAX777L delivers

a 5V output, the MAX778L generates pin-selectable voltages of

3.0V or 3.3V, and the MAX779L output can be adjusted from

2.5V to 6V through an external resistive divider.

♦ Load Fully Disconnected in Shutdown

♦ 82% Efficiency

♦ Output in Regulation with Input Voltage above

The devices include an Active Rectifier^TMthat eliminates the

need for an external catch diode, and permits regulation even

when the input is greater than the output. Also, unlike those in

other step-up converters, the MAX777L/MAX778L/MAX779L’s

Active Rectifier^TMturns off in the shutdown mode, disconnect-

ing the output from the source. This eliminates the current drain

associated with conventional step-up converters when off or in

shutdown.

Output Voltage

♦ Internal 1A Power Switch and Active Rectifier

♦ Adjustable Current Limit Allows Low-Cost

Inductors

♦ 190µA No Load Supply Current

♦ 20µA Shutdown Supply Current

High-frequency operation (up to 150kHz) allows the use of

small, surface-mount inductors with values of 10µH or less.

Supply current is 190µA under no load and only 20µA in stand-

by mode; supply voltage can range from 1V to 4.5V (1 to 3

cells). With a 2V input, the devices typically deliver 200mA at

5V, or 300mA at 3V.

♦ 3V/3.3V (MAX778L), 5V (MAX777L), and

Adjustable (MAX779L) Output Voltage

______________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

For fully specified devices designed for step-up/step-down

applications (where the input can be above or below the out-

put), refer to the MAX877L/MAX878L/MAX879L data sheet.

MAX777LCPA

MAX777LCSA

MAX777LC/D

MAX777LEPA

MAX777LESA

MAX777LMJA

0°C to +70°C

Dice*

________________________Ap p lic a t io n s

-40°C to +85°C

-55°C to +125°C

8 Plastic DIP

8 SO

Single Battery-Cell (1V), Step-Up Voltage Conversion

Efficient, High-Power Step-Up Regulation from

Low Input Voltages

8 CERDIP**

Ordering Information continued at end of data sheet.

* Dice are specified at T = +25°C, DC parameters only.

Pagers

**Contact factory for availability and processing to MIL-STD-883.

Portable Instruments & Hand-Held Terminals

Notebook and Palmtop Computers

__________________P in Co n fig u ra t io n

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

INPUT

1V TO 4.5V

TOP VIEW

22µF

22µH

ILIM

N.C. (MAX777L)

SHDN

OUT

MAX777L

ILIM

SHDN

MAX777L

MAX778L

MAX779L

AGND

PGND

OUTPUT

ON/OFF

OUT

100µF

PGND

AGND

DIP/SO

* SEL FOR MAX778L, FB FOR MAX779L.

Active Rectifier is a trademark of Maxim Integrated Products.

________________________________________________________________ Maxim Integrated Products

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

12 3 4 5 6 7...12

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与MAX778L相关器件

型号	品牌	获取价格	描述	数据表
MAX778LC/D	MAXIM	获取价格	Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
MAX778LCPA	MAXIM	获取价格	Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
MAX778LCSA	MAXIM	获取价格	Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
MAX778LCSA+	MAXIM	获取价格	暂无描述
MAX778LCSA-T	MAXIM	获取价格	暂无描述
MAX778LEPA	MAXIM	获取价格	Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
MAX778LESA	MAXIM	获取价格	Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
MAX778LESA+	MAXIM	获取价格	Switching Regulator, Current-mode, 1A, 150kHz Switching Freq-Max, PDSO8, 0.150 INCH, SOIC-
MAX778LMJA	MAXIM	获取价格	Low-Voltage Input, 3V/3.3V/5V/ Adjustable Output, Step-Up DC-DC Converters
MAX778MJA	MAXIM	获取价格	Low-Voltage-Input, 3V/3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters

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