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LTC3527EUD-1-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3527EUD-1-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC3527/LTC3527-1 1 35271f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters The LTC®3527/LTC3527-1 are dual high efficiency, step-up DC/DC converters in a space saving 16-lead 3mm × 3mm QFN package. Battery life is maximized with a 700mV start-up voltage and operation down to 500mV once started. The ⎯S⎯H⎯D⎯N and PGOOD pins enable the converters to be sequenced or started together. The LTC3527/LTC3527-1 limit inrush current during start- up. Selectable 1.2MHz or 2.2MHz operation provides a choice between the highest efficiency or smallest solu- tion footprint. The current mode PWM design is internally compensated reducing external parts count. Burst Mode operation or fixed frequency operation is selectable via the MODE pin. Anti-ring circuitry reduces EMI in discontinuous mode. This device also features thermal shutdown. True output disconnect allows the output to be completely open in shutdown. The LTC3527-1 actively discharges VOUT1 or VOUT2 when its respective ⎯S⎯H⎯D⎯N goes low. Qui- escent current in shutdown is less than 2µA. 1.2MHz Efficiency and Power Loss ■ Dual Synchronous Step-Up DC/DC Converters ■ Delivers 3.3V at 200mA/100mA from one Alkaline/ NiMH Cell, or 3.3V at 400mA/200mA from Two Cells ■ VIN Start-Up Voltage: 700mV ■ 0.5V to 5V VIN Range after Start-Up ■ 1.6V to 5.25V VOUT Range ■ Output Disconnect in Shutdown ■ VIN > VOUT Operation ■ 1.2MHz or 2.2MHz Operation ■ Up to 94% Efficiency ■ 12µA Quiescent Current in Burst Mode® Operation ■ Inrush Current Limiting and Soft-Start ■ Internal Synchronous Rectifiers ■ Logic-Controlled Shutdown (< 2µA) ■ Quick VOUT Discharge (LTC3527-1) ■ 16-Lead, 0.75mm × 3mm × 3mm QFN Package ■ MP3/Personal Media Players ■ Noise Canceling / Bluetooth Headsets ■ Wireless Mice ■ Portable Medical Instruments , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LOAD CURRENT (mA) 30 90 100 20 10 80 50 70 60 40 0.01 1 100 10 1000 35271 TA01b 0 1000 0.1 100 10 1 0.01 0.1 BURST EFFICIENCY FIXED FREQUENCY POWER LOSS BURST VIN = 2.4V VOUT1 = 3.3V Two-Cell Alkaline to 3.3V/1.8V Synchronous Boost Converters 35271 TA01 + ON OFF 4.7 µF LTC3527 4.7 µH 4.7 µH 4.7 µF 4.7 µF 1.6V to 3.2V SW1 VOUT1 VOUT2 VIN1 VIN VIN2 FB1 PGOOD1 SHDN1 SW2 FB2 PGOOD2 SHDN2 MODE GND FSEL VOUT 3.3V 150mA VOUT 1.8V 150mA VIN 1.78M 1M 619k 1.21M ON OFF |
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