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LTC1174 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1174 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LTC1174 LTC1174-3.3/LTC1174-5 1174fe High Efficiency Step-Down and Inverting DC/DC Converter High Efficiency Step-Down Converter LTC1174-5 Efficiency ■ High Efficiency: Up to 94% ■ Peak Inductor Current Independent of Inductor Value ■ Short-Circuit Protection ■ Optimized for 5V to – 5V Applications ■ Wide VIN Range: 4V to 18.5V ■ Low Dropout Operation ■ Low-Battery Detector ■ Pin Selectable Current Limit ■ Internal 0.9 Ω Power Switch: VIN = 9V ■ Only Four External Components Required ■ 130 µA Standby Current ■ Active Low Micropower Shutdown ■ Distributed Power Systems ■ Step-Down Converters ■ Inverting Converters ■ Memory Backup Supply ■ Portable Instruments ■ Battery-Powered Equipment The LTC ®1174 is a simple current mode DC/DC converter ideally suited for 9V to 5V, 5V to 3.3V or 5V to – 5V operation. With an internal 0.9 Ω 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 130 µA. In shutdown, it draws a mere 1 µA making this converter ideal for current sensitive 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 LTC1174 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 data sheet. FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO VIN 9V 3 LTC1174-5 LBIN LBOUT IPGM GND VIN SHUTDOWN VOUT SW 2 7 6 8 1 5 4 100 µH† 100 µF** 10V 5V 175mA 15 µF* 25V ×3 1N5818 1174 TA01 * ** † (3) AVX TPSD156K025 AVX TPSD107K010 COILTRONICS CTX100-4 + + LOAD CURRENT (mA) 1 100 95 90 85 80 75 70 10 100 1174 TA02 200 VIN = 6V VIN = 9V L = 100 µH VOUT = 5V IPGM = 0V , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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