LTC1475CS8-5#TRPBF datasheet, PDF

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LTC1475CS8-5#TRPBF: DescriptionConv DC-DC 3V to 18V Step Down Single-Out 5V 0.3A 8-Pin SOIC N T/R; CategoryPower/power management The power supply circuit; File Size238KB，20 Pages; ManufacturerADI; Websitehttps://www.analog.com; Environmental Compliance

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LTC1475CS8-5#TRPBF Overview

Conv DC-DC 3V to 18V Step Down Single-Out 5V 0.3A 8-Pin SOIC N T/R

LTC1475CS8-5#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Analog Devices Inc
Is it lead-free?	Contains lead
Is it Rohs certified?	conform to
Maker	ADI
package instruction	SOP,
Contacts	8
Manufacturer packaging code	05-08-1610 (S8)
Reach Compliance Code	compliant
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	18 V
Minimum input voltage	3 V
Nominal input voltage	10 V
JESD-30 code	R-PDSO-G8
JESD-609 code	e3
length	4.9 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	0.75 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	BUCK
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	3.9 mm

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LTC1474/LTC1475

Low Quiescent Current

High Efficiency Step-Down

Converters

DESCRIPTION

The LT C

1474/LTC1475 series are high efficiency step-

down converters with internal P-channel MOSFET power

switches that draw only 10µA typical DC supply current at

no load while maintaining output voltage. The LTC1474

uses logic-controlled shutdown while the LTC1475 fea-

tures pushbutton on/off.

The low supply current coupled with Burst Mode

opera-

tion enables the LTC1474/LTC1475 to maintain high effi-

ciency over a wide range of loads. These features, along

with their capability of 100% duty cycle for low dropout

and wide input supply range, make the LTC1474/LTC1475

ideal for moderate current (up to 300mA) battery-powered

applications.

The peak switch current is user-programmable with an

optional sense resistor (defaults to 325mA minimum if not

used) providing a simple means for optimizing the design

for lower current applications. The peak current control

also provides short-circuit protection and excellent start-

up behavior. A low-battery detector that remains functional

in shutdown is provided .

The LTC1474/LTC1475 series availability in 8-lead MSOP

and SO packages and need for few additional components

provide for a minimum area solution.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Burst Mode is a trademark of Linear Technology Corporation.

FEATURES

High Efficiency: Over 92% Possible

Very Low Standby Current: 10

A Typ

Available in Space Saving 8-Lead MSOP Package

Internal 1.4Ω Power Switch (V

= 10V)

Wide V

Range: 3V to 18V Operation

Very Low Dropout Operation: 100% Duty Cycle

Low-Battery Detector Functional During Shutdown

Programmable Current Limit with Optional

Current Sense Resistor (10mA to 400mA Typ)

Short-Circuit Protection

Few External Components Required

Active Low Micropower Shutdown: I

= 6µA Typ

Pushbutton On/Off (LTC1475 Only)

3.3V, 5V and Adjustable Output Versions

APPLICATIONS

Cellular Telephones and Wireless Modems

4mA to 20mA Current Loop Step-Down Converter

Portable Instruments

Battery-Operated Digital Devices

Battery Chargers

Inverting Converters

Intrinsic Safety Applications

TYPICAL APPLICATION

100

4V TO 18V

LOW BATTERY OUT

10µF

25V

0.1µF

SENSE

LTC1474-3.3

LBO

LBI

RUN

MBR0530

1474/75 F01

OUT

3.3V AT 250mA

100µH

EFFICIENCY (%)

LOW BATTERY IN

RUN SHDN

100k

100µF

6.3V

GND

L1 = SUMIDA CDRH74-101

Figure 1. High Efficiency Step-Down Converter

LTC1474 Efficiency

= 5V

= 10V

= 15V

L = 100µH

OUT

= 3.3V

SENSE

= 0Ω

0.03

0.3

LOAD CURRENT (mA)

300

1474/75 TA01

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