Datasheet > MAX640

MAX640

更新时间： 2024-10-03 22:12:35

品牌	Logo	应用领域
美信 - MAXIM		转换器
页数	文件大小	规格书
12页	168K
描述
5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, 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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MAX640 数据手册

19-4505; Rev 3; 8/97

5 V/3 .3 V/3 V/Ad ju s t a b le , Hig h -Effic ie n c y,

Lo w I_Q, S t e p -Do w n DC-DC Co n ve rt e rs

940/MAX653

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

____________________________Fe a t u re s

♦ High Efficiency for a Wide Range of Load Currents

♦ 10µA Quiescent Current

The MAX639/MAX640/MAX653 ste p-down switc hing

regulators provide high efficiency over a wide range of

load currents, delivering up to 225mA. A current-limiting

pulse-frequency-modulated (PFM) control scheme gives

the d e vic e s the b e ne fits of p uls e -wid th-mod ula te d

(PWM) converters (high efficiency at heavy loads), while

using only 10µA of supply current (vs. 2mA to 10mA for

PWM converters). The result is high efficiency over a

wide range of loads.

♦ Output Currents Up to 225mA

♦ Preset or Adjustable Output Voltage:

5.0V (MAX639)

3.3V (MAX640)

3.0V (MAX653)

The MAX639/MAX640/MAX653 inp ut ra ng e is 4V to

11.5V, and the devices provide lower preset output volt-

ages of 5V, 3.3V, and 3V, respectively. Or, the output

can be user-adjusted to any voltage from 1.3V to the

input voltage.

♦ Low-Battery Detection Comparator

♦ Current-Limiting PFM Control Scheme

The MAX639/MAX640/MAX653 have an internal 1A power

MOSFET switch, making them ideal for minimum-compo-

nent, low- and medium-power applications. For increased

output drive capability, use the MAX649/MAX651/MAX652

step-down controllers, which drive an external P-channel

FET to deliver up to 5W.

______________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

MAX639CPA

MAX639CSA

MAX639C/D

MAX639EPA

MAX639ESA

MAX639MJA

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

9V Battery to 5V, 3.3V, or 3V Conversion

High-Efficiency Linear Regulator Replacement

Portable Instruments and Handy-Terminals

5V-to-3.3V Converters

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

__________________P in Co n fig u ra t io n

TOP VIEW

INPUT

5.5V TO 11.5V

OUTPUT

V+

225mA

VOUT

LBO

SHDN

VFB

MAX639

MAX640

MAX653

MAX639

SHDN

LBI

ON/OFF

VOUT

LBO

LBI

V+

LOW-BATTERY

DETECTOR

OUTPUT

LOW-BATTERY

DETECTOR

INPUT

GND

DIP/SO

VFB

GND

________________________________________________________________ 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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与MAX640相关器件

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MAX6400	MAXIM	获取价格	レP Supervisory Circuits in 4-Bump (2 x 2) Chi
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MAX6400-22UK	NXP	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA4, MO-195, WL-CSP4, Power Management Circuit
MAX6400-26UK	NXP	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA4, MO-195, WL-CSP4, Power Management Circuit
MAX6400-27UK	NXP	获取价格	IC,VOLT DETECTOR,FIXED,+2.7V,BGA,4PIN,PLASTIC
MAX6400-28UK	NXP	获取价格	IC,VOLT DETECTOR,FIXED,+2.8V,BGA,4PIN,PLASTIC
MAX6400BS__-T	MAXIM	获取价格	レP Supervisory Circuits in 4-Bump (2 x 2) Chi
MAX6400BS22+	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PBGA4, BUMP, UCSP-4
MAX6400BS22+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, +2.2VV, BICMOS, PBGA4, BUMP, UCSP-4
MAX6400BS22-T	MAXIM	获取价格	Analog IC

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