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LTC1144CS8#PBF

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仕様・特性

LTC1144 Switched-Capacitor Wide Input Range Voltage Converter with Shutdown Features Description Wide Operating Supply Voltage Range: 2V to 18V Boost Pin (Pin 1) for Higher Switching Frequency Simple Conversion of 15V to –15V Supply Low Output Resistance: 120Ω Maximum Power Shutdown to 8µA with SHDN Pin Open Circuit Voltage Conversion Efficiency: 99.9% Typical n Power Conversion Efficiency: 93% Typical n Easy to Use The LTC®1144 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range of 2V to 18V, resulting in complementary output voltages of –2V to –18V. Only two noncritical external capacitors are needed for the charge pump and charge reservoir functions. n n n n n n Applications n n n n n n n Conversion of 15V to ±15V Supplies Inexpensive Negative Supplies Data Acquisition Systems High Voltage Upgrade to LTC1044 or 7660 Voltage Division and Multiplications Automotive Applications Battery Systems with Wall Adapter/Charger The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs at a 10kHz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the Boost Pin is tied to V+. The SHDN pin reduces supply current to 8µA and can be used to save power when the converter is not in use. The LTC1144 contains an internal oscillator, divide-by- two, voltage level shifter, and four power MOSFETs. A special logic circuit will prevent the power N-channel switch substrate from turning on. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application Output Voltage vs Load Current, V+ = 15V Generating –15V from 15V LTC1144 2 3 4 CAP+ –15 V+ OSC GND SHDN CAP– VOUT 8 ROUT = 56Ω TA = 25°C 15V INPUT 7 –14 6 5 –15V OUTPUT 10µF 1144 TA01 OUTPUT VOLTAGE (V) 10µF + BOOST + 1 –13 –12 –11 –10 0 10 30 40 20 LOAD CURRENT (mA) 50 1144 TA02 1144fa For more information www.linear.com/LTC1144 1

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