SC1537

更新时间： 2024-11-06 22:43:27

品牌	Logo	应用领域
商升特 - SEMTECH		/
页数	文件大小	规格书
7页	98K
描述
700mA SmartLDOTM

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中文翻译

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数据手册

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SC1537 数据手册

700mA SmartLDO^TM

SC1537

PRELIMINARY - July 25, 2000

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

FEATURES

•= Glitch-free transition between input sources

•= Internal logic selects input source

•= Gate drive for external PMOS bypass switch

•= 5V detector with hysteresis

The SC1537 is designed to maintain a glitch-free 3.3V

output when at least one of two inputs, 5V (VIN) and

3.3V (VAUX), is present.

•= 1% regulated output voltage accuracy

•= 700mA load current capability

Whenever VIN exceeds a predetermined threshold

value, the internal 3.3V linear regulator is enabled, and

DR is pulled high.

•= SO-8 and TO-263 packages

When VIN falls below a lower threshold value, DR is

pulled low and the internal linear regulator is turned off.

DR has been designed to drive the gate of an external

low threshold P-channel MOSFET, which can be used

to connect the 3.3V supply directly to the regulator

output. This ensures an uninterrupted 3.3V output even

if VIN falls out of specification. A maximum R_DS(ON)of

100mΩ is recommended.

APPLICATIONS

•= Desktop Computers

•= Network Interface Cards (NICs)

•= PCMCIA/PCI Interface Cards

•= Cardbus^TMTechnology

•= Power supplies with multiple input sources

When both supplies are simultaneously available, the

drive pin (DR) will be pulled High, turning off the exter-

nal PMOS switch.

ORDERING INFORMATION

Part Number⁽¹⁾

SC1537CSTR

SC1537CMTR

Package

SO-8

The internal 5V detector has its upper threshold (for

VIN rising) set to 4.22V (typical) while the lower thresh-

old (for VIN falling) is at 4.05V (typical) giving a hystere-

sis of approximately 170mV.

TO-263-5L

Note:

(1) Only available in tape and reel packaging. A reel con-

tains 2500 devices for SO-8 and 800 devices for TO-263.

The SC1537 is available in the popular SO-8 and

5-lead TO-263 surface mount packages.

APPLICATION CIRCUIT

3.3V OUT

U1 SC1537CS

3.3V

VAUX GND

VIN

GND

10uF

0.1uF

10uF

0.1uF

SC1537CM

TAB

VIN

3.3V

3.3V OUT

VAUX

GND

0.1uF

10uF

0.1uF

10uF

0.1uF

NOTE:

(1) External switch (Q1): use a low threshold P-channel MOSFET such as Vishay Si2305DS (R_DS(ON)< 71mΩ at

V_GS= 2.5V) or International Rectifier IRLML6401 (R_DS(ON)< 85mΩ at V_GS= 2.5V), or equivalent.

652 MITCHELL ROAD NEWBURY PARK CA 91320

12 3 4 5 6 7

中文翻译

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与SC1537相关器件

型号	品牌	获取价格	描述	数据表
SC1537CMTR	SEMTECH	获取价格	700mA SmartLDOTM
SC1537CMTRT	SEMTECH	获取价格	Fixed Positive LDO Regulator, 3.3V, PSSO5, TO-263, 5 PIN
SC1537CSTR	SEMTECH	获取价格	700mA SmartLDOTM
SC1538	SEMTECH	获取价格	DUAL LINEAR CONTROLLER
SC1538CS15	SEMTECH	获取价格	DUAL LINEAR CONTROLLER
SC1538CS15/18TR	SEMTECH	获取价格	Power Supply Support Circuit, Fixed, 2 Channel, BIPolar, PDSO8, SO-8
SC1538CS18	SEMTECH	获取价格	DUAL LINEAR CONTROLLER
SC1538CS25	SEMTECH	获取价格	DUAL LINEAR CONTROLLER
SC1538CS25/25	SEMTECH	获取价格	Power Supply Support Circuit, Fixed, 2 Channel, BIPolar, PDSO8, SO-8
SC1538CS25/25TR	SEMTECH	获取价格	Power Supply Support Circuit, Fixed, 2 Channel, BIPolar, PDSO8, SO-8

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