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LTC3809-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3809-1 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LTC3809-1 1 38091fc TYPICAL APPLICATION DESCRIPTION No RSENSETM, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking The LTC ®3809-1 is a synchronous step-down switching regulator controller that drives external complementary power MOSFETs using few external components. The constantfrequencycurrentmodearchitecturewithMOSFET VDSsensingeliminatestheneedforacurrentsenseresistor and improves efficiency. Optional Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation, extending operating time in battery- powered systems. Burst Mode is inhibited when the MODE pin is pulled low to reduce noise and RF interference. The LTC3809-1 allows either coincident or ratiometric output voltage tracking. Switching frequency is fixed at 550kHz. Fault protection is provided by an overvoltage comparator and a short-circuit current limit comparator. The LTC3809-1 is available in tiny footprint thermally enhanced DFN and 10-lead MSOP packages. High Efficiency, 550kHz Step-Down Converter , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst is a registered trademark of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5929620, 6580258, 6304066, 5847554, 6611131, 6498466. Other Patents pending. FEATURES APPLICATIONS n 1- or 2-Cell Lithium-Ion Powered Devices n Notebook and Palmtop Computers, PDAs n Portable Instruments n Distributed DC Power Systems n Programmable Output Voltage Tracking n No Current Sense Resistor Required n Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response n Wide VIN Range: 2.75V to 9.8V n Wide VOUT Range: 0.6V to VIN n 0.6V ±1.5% Reference n Low Dropout Operation: 100% Duty Cycle n Selectable Burst Mode ®/Pulse-Skipping/Forced Continuous Operation n Auxiliary Winding Regulation n Internal Soft-Start Circuitry n Selectable Maximum Peak Current Sense Threshold n Output Overvoltage Protection n Micropower Shutdown: IQ = 9μA n Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN and 10-lead MSOP Packages Efficiency and Power Loss vs Load Current LTC3809-1 2.2μH 10μF 47μF 38091 TA01 15k 59k 187k 470pF GND IPRG MODE RUN SW TG BG VIN VFB VIN 2.75V TO 9.8V VOUT 2.5V 2A ITH LOAD CURRENT (mA) 100 90 80 70 60 50 10k 1k 100 10 1 0.1 1 100 1k 10k 38091 TA02 10 VIN = 3.3V VIN = 5V VIN = 4.2V FIGURE 8 CIRCUIT VOUT = 2.5V TYPICAL POWER LOSS (VIN = 4.2V) EFFICIENCY |
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Similar Description - LTC3809-1_15 |
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