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LTC1574CS-3.3 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1574CS-3.3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LTC1574 LTC1574-3.3/LTC1574-5 High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode The LTC ®1574 is a family of easy-to-use current mode DC/DC converters ideally suited for 9V to 5V, 5V to 3.3V and inverting operation. With an internal 0.9 Ω switch (at a supply voltage of 12V) and a low forward drop Schottky diode (0.450V typ at 200mA, TA = 25°C), the LTC1574 requires only three external components to construct a complete high efficiency DC/DC converter. Under no load condition, the LTC1574 draws only 130 µA. In shutdown, it draws a mere 2 µA making this converter ideal for battery-powered applications. In dropout, the internal P-channel MOSFET switch is turned on continu- ously allowing the user to maximize the life of the battery source. The maximum inductor current of the LTC1574 family is pin selectable to either 340mA or 600mA, optimizing efficiency for a wide range of applications. Operation up to 200kHz permits the use of small surface mount inductors and capacitors. For applications requiring higher output current or ultra- high efficiency, see the LTC1148 and LTC1265 data sheets. For detailed applications information, see the LTC1174 data sheet. DESCRIPTION FEATURES High Efficiency Step-Down Converter TYPICAL APPLICATION + VIN 100 µH† 22 µF* 35V + 100 µF* 10V 1574 TA01 5V 175mA 5 2, 4, 13, 15 7 10 3, 14 12 11 6 VIN 5.5V to 16V GND LTC1574-5 LBIN LBOUT IPGM SHDN VOUT SW * AVX TPSD226K035 ** AVX TPSD107K010 † COILTRONICS CTX100-4 LTC1574-5 Efficiency LOAD CURRENT (mA) 1 100 95 90 85 80 75 70 10 100 1574 TA02 200 VIN = 6V VIN = 9V L = 100 µH VOUT = 5V IPGM = 0V APPLICATIONS and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. s Inverting Converters s Step-Down Converters s Memory Backup Supply s Portable Instruments s Battery-Powered Equipment s Distributed Power Systems s High Efficiency: Up to 94% s Usable in Noise-Sensitive Products s Peak Inductor Current Independent of Inductor Value s Short-Circuit Protection s Internal Low Forward Drop Schottky Diode s Only Three External Components Required s Wide VIN Range: 4V to 18.5V (Absolute Maximum) s Low Dropout Operation s Low-Battery Detector s Pin Selectable Current Limit s Internal 0.9 Ω Power Switch: VIN = 12V s Standby Current: 130 µA s Active Low Micropower Shutdown |
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