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LTC1474
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DataSheet
General Description

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MFG:LT Package Cooled:SOP D/C:10

LTC Series Datasheet download

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Part Number: LTC1474

MFG: LT

Package Cooled: SOP

D/C: 10

Description: The LTC® 1474/LTC1475 series are high efficiency step- down converters with internal P-channel MOSFET power switche...

LTC1474 General Description

The LTC® 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 features pushbutton on/off.

The low supply current coupled with Burst Mode TM operation enables the LTC1474/LTC1475 to maintain high efficiency 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-powere 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 startup 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 solu -tion.

LTC1474 Maximum Ratings

Input Supply Voltage (VIN) .........................0.3V to 20V
Switch Current (SW, SENSE) .............................. 750mA
Switch Voltage (SW) .......... (VIN 20V) to (VIN + 0.3V)
VFB (Adjustable Versions) .........................0.3V to 12V
VOUT (Fixed Versions) .............................. 0.3V to 20V
LBI, LBO ....................................................0.3V to 20V
RUN, SENSE ................................ 0.3V to (VIN + 0.3V)
Operating Ambient Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ........................................... 40°C to 85°C
Junction Temperature (Note 1) ........................ 125°C
Storage Temperature Range ............65°C to 150°C
Lead Temperature (Soldering, 10 sec................ 300°C

LTC1474 Features

* High Efficiency: Over 92% Possible
* Very Low Standby Current: 10µA Typ
* Available in Space Saving 8-Lead MSOP Package
* Internal 1.4Ω Power Switch (VIN = 10V)
* Wide VIN 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: IQ = 6µA Typ
* Pushbutton On/Off (LTC1475 Only)
* 3.3V, 5V and Adjustable Output Versions

LTC1474 Typical Application

* 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

LTC1474 datasheet

LTC1474
PDF/DataSheet Download

Datasheet: LTC1474
File Size: 358933 KB
Manufacturer: Linear
Click here to Download

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