特点
High Efficiency: Up to 94%
Peak Inductor Current Independent of Inductor Value
Short-Circuit Protection
Optimized for 5V to ±5V Applications
Wide V
IN
Range: 4V to 18.5V
Low Dropout Operation
Low-Battery Detector
Pin Selectable Current Limit
Internal 0.9 Ohms Power Switch: V
IN
= 9V
Only Four External Components Required
130μA Standby Current
Active Low Micropower Shutdown
典型应用
典型应用
描述
描述 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 Ohms 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 130μA. In shutdown, it draws a mere 1μA 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 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.