Details, datasheet, quote on part number: LTC1174CN8
PartLTC1174CN8
CategoryPower Management => Regulators => Switching Regulators => Inverting
TitleInverting
DescriptionLTC1174, 500mA, High Efficiency Step-down And Inverting DC/DC Converter
CompanyLinear Technology Corporation
DatasheetDownload LTC1174CN8 datasheet
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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.

and LTC are registered trademarks and is a trademark of Linear Technology Corporation.

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

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

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

LTC1174-3.3/LTC1174HV-3.3 LTC1174-5/LTC1174V-5 VIN to 12V, ILOAD = 100mA, IPGM = VIN (Note 3) 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

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 IQ Input DC Supply Current (Note 4)

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

CONDITIONS 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 q 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: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: TA + (PD TA + (PD 150C/W)

Note 3: Guaranteed by design. Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. Note 5: Current into Pin 6 only, measured without electrolytic input capacitor. Note 6: The off-time is wafer-sort trimmed.


 

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