Details, datasheet, quote on part number: LTC1174CS8-3.3
PartLTC1174CS8-3.3
CategoryPower Management and Supplies => IC Voltage Regulators => IC Switching Voltage Regulators => 6921111
Title1 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDIP8
Description
CompanyLinear Technology Corporation
DatasheetDownload LTC1174CS8-3.3 datasheet
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Specifications 
Configuration / FunctionBuck
Package TypeDIP, Other, 0.300 INCH, PLASTIC, DIP-8
Life Cycle StageACTIVE
IOUT1 amps
VIN9 volts
fsw200 kHz
Operating Temperature0 to 70 C (32 to 158 F)

 

Features, Applications
LTC1174 LTC1174-3.3/LTC1174-5 High Efficiency Step-Down and Inverting DC/DC Converter
FEATURES

High Efficiency: to 94% Peak Inductor Current Independent of Inductor Value Short-Circuit Protection Optimized for 5V Applications Wide VIN Range: to 18.5V Low Dropout Operation Low-Battery Detector Pin Selectable Current Limit Internal 0.9 Power Switch: VIN = 9V Only Four External Components Required 130A Standby Current Active Low Micropower Shutdown

The is a simple current mode DC/DC converter ideally suited for 5V operation. With an internal 0.9 switch (at a supply voltage of 9V), the LTC1174 requires only four external components to construct a complete high efficiency DC/DC converter. Under a no load condition the LTC1174 draws only 130A. In shutdown, it draws a mere 1A making this converter ideal for current sensitive applications. In dropout, the internal P-channel MOSFET switch is turned on continuously allowing the user to maximize the life of the battery source. The maximum inductor current of the LTC1174 family is pin selectable to either or 600mA, optimizing efficiency for a wide range of applications. Operation to 200kHz permits the use of small surface mount inductors and capacitors. For applications requiring higher output current or ultrahigh efficiency, see the LTC1148 data sheet.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Distributed Power Systems Step-Down Converters Inverting Converters Memory Backup Supply Portable Instruments Battery-Powered Equipment

(Voltage Referred to GND Pin) Input Supply Voltage (Pin to 18.5V Switch Current (Pin 5).............................................. 1A Switch Voltage (Pin 5) LTC1174................................................. VIN 13.5V LTC1174HV............................................ VIN 18.5V

TOP VIEW VOUT (VFB*) 1 LBOUT 2 LBIN 3 GND 4 N8 PACKAGE 8-LEAD PDIP * ADJUSTABLE OUTPUT VERSION TJMAX = 110C/W SHUTDOWN IPGM VIN SW

Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges.

SYMBOL IFB VFB VOUT PARAMETER Feedback Current Feedback Voltage Regulated Output Voltage Output Voltage Line Regulation

The denotes specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 9V, VSHUTDOWN = VIN, IPGM = 0V, unless otherwise noted.

Operating Temperature Range to 85C Junction Temperature (Note 2)............................ 125C Storage Temperature Range................ to 150C Lead Temperature (Soldering, 10 sec)................. 300C

TOP VIEW VOUT (VFB*) 1 LBOUT 2 LBIN 3 GND SHUTDOWN IPGM VIN SW
SYMBOL PARAMETER Output Voltage Load Regulation

The denotes specifications which apply over the full operating temperature range, otherwise specifications are = 25C. VIN = 9V, VSHUTDOWN = VIN, IPGM = 0V, unless otherwise noted.

CONDITIONS LTC1174-3.3 (Note 20mA < ILOAD < 175mA, IPGM 20mA < ILOAD < 400mA, IPGM = VIN LTC1174-5 (Note 20mA < ILOAD < 175mA, IPGM 20mA < ILOAD < 400mA, IPGM = VIN Active Mode 4V < VIN < 12V, IPGM 4V < VIN < 16V, IPGM = 0V Sleep Mode 4V < VIN 4V < VIN < 16V SHUTDOWN (Note 4) LTC1174: VSHUTDOWN 4V < VIN 12V LTC1174HV: VSHUTDOWN 4V < VIN < 16V MIN TYP MAX UNITS V A

VLBTRIP ILBIN ILBOUT VHYST IPEAK RON tOFF VIH VIL IIH IIL

Low-Battery Trip Point Current into Pin 3 Current Sunk by Pin 2 Comparator Hysteresis Current Limit ON Resistance of Switch Off-Time (Note 6) SHUTDOWN Pin High SHUTDOWN Pin Low SHUTDOWN Pin Input Current SHUTDOWN Pin Input Current

LTC1174: VLBOUT 0.4V LTC1174HV: VLBOUT 0.4V LTC1174/LTC1174HV IPGM = VIN, VOUT = 0V IPGM = 0V, VOUT LTC1174 LTC1174HV VOUT at Regulated Value Minimum Voltage at Pin 8 for Device to Be Active Maximum Voltage at Pin 8 for Device Be in Shutdown LTC1174: VSHUTDOWN 12V LTC1174HV: VSHUTDOWN 16V 0 VSHUTDOWN 0.8V

The denotes specifications which apply over the full operating temperature range, otherwise specifications are 85C. LTC1174I and LTC1174HVI Only.

SYMBOL PARAMETER VFB Feedback Voltage ILBOUT Current Sunk by Pin 2 IPEAK Current Limit CONDITIONS LTC1174I/LTC1174HVI VLBOUT 0.4V (LTC1174I) VLBOUT 0.4V (LTC1174HVI) IPGM = VIN, VOUT 0V (LTC1174I) IPGM = 0V, VOUT 0V (LTC1174I) IPGM = VIN, VOUT 0V (LTC1174HVI) IPGM = 0V, VOUT 0V (LTC1174HVI) VOUT at Regulated Value (LTC1174I) VOUT at Regulated Value (LTC1174HVI) LTC1174I/LTC1174HVI

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.

Note TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: TA + (PD TA + (PD 150C/W)


 

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