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LTC1911-15 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1911-15 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1911-1.5/LTC1911-1.8 sn1911 1911is Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter August 2002 The LTC ®1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capaci- tor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal cir- cuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. Typical efficiency is over 25% higher than that of a linear regulator. A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency, the part enters Burst Mode TM operation under light load conditions. Low operating current (180 µA with no load, 10µA in shutdown) and low external parts count (two 1 µF flying capacitors and two 10 µF bypass capacitors) make the LTC1911 ideally suited for space constrained battery- powered applications. The part is short-circuit and overtemperature protected, and is available in an 8-pin MSOP package. s Low Noise Constant Frequency Operation s 2.7V to 5.5V Input Voltage Range s No Inductors s Typical Efficiency 25% Higher Than LDOs s Shutdown Disconnects Load from VIN s Output Voltage: 1.8V ±4% or 1.5V ±4% s Output Current: 250mA s Low Operating Current: IIN = 180µA Typ s Low Shutdown Current: IIN = 10µA Typ s Oscillator Frequency: 1.5MHz s Soft-Start Limits Inrush Current at Turn On s Short-Circuit and Overtemperature Protected s Available in an 8-Pin MSOP Package , LTC and LT are registered trademarks of Linear Technology Corporation. s Handheld Computers s Cellular Phones s Smart Card Readers s Portable Electronic Equipment s Handheld Medical Instruments s Low Power DSP Supplies Final Electrical Specifications Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO VIN C2+ C2– GND 8 6 7 5 1 2 3 4 SS/SHDN VOUT C1+ C1– LTC1911-1.8 1 µF* 1-CELL Li-Ion OR 3-CELL NiMH 10 µF* *CERAMIC CAPACITOR 10 µF* 1911 TA01 VOUT = 1.8V IOUT = 250mA 1 µF* 2.7V TO 5.5V INPUT Single Cell Li-Ion to 1.8V DC/DC Converter Efficiency Burst Mode is a trademark of Linear Technology Corporation. INPUT VOLTAGE (V) 2 30 40 50 60 70 80 90 34 5 6 1911 G05 IDEAL LDO 250mA 100mA |
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Similar Description - LTC1911-15 |
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