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LTC3411EMS Datasheet(PDF) 1 Page - Linear Technology |
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LTC3411EMS Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC3411 1 sn3411 3411fs The LTC ®3411 is a constant frequency, synchronous, step- down DC/DC converter. Intended for medium power applications, it operates from a 2.63V to 5.5V input voltage range and has a user configurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 0.8V to 5V. Internal sychronous 0.11 Ω power switches with 1.6A peak current ratings provide high efficiency. The LTC3411’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. The LTC3411 can be configured for automatic power saving Burst Mode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. For reduced noise and RF interfer- ence, the SYNC/MODE pin can be configured to skip pulses or provide forced continuous operation. To further maximize battery life, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle) with a low quiescent current of 60 µA. In shutdown, the device draws <1 µA. s Notebook Computers s Digital Cameras s Cellular Phones s Handheld Instruments s Board Mounted Power Supplies , LTC and LT are registered trademarks of Linear Technology Corporation. s Small 10-Lead MSOP or DFN Package s Uses Tiny Capacitors and Inductor s High Frequency Operation: Up to 4MHz s High Switch Current: 1.6A s Low RDS(ON) Internal Switches: 0.110Ω s High Efficiency: Up to 95% s Stable with Ceramic Capacitors s Current Mode Operation for Excellent Line and Load Transient Response s Short-Circuit Protected s Low Dropout Operation: 100% Duty Cycle s Low Shutdown Current: IQ ≤ 1µA s Low Quiescent Current: 60 µA s Output Voltages from 0.8V to 5V s Selectable Burst Mode ® Operation s Sychronizable to External Clock 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter Efficiency vs Load Current Figure 1. Step-Down 2.5V/1.25A Regulator Burst Mode is a registered trademark of Linear Technology Corporation. DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO SYNC/MODE VIN LTC3411 PVIN SW SVIN PGOOD ITH SHDN/RT PGND SGND VFB L1 2.2 µH VOUT 2.5V/1.25A VIN 2.63V TO 5.5V 887k 412k 1000pF 3411 F01 C2 22 µF 13k C1 22 µF 324k NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE C1, C2: TAIYO YUDEN JMK325BJ226MM L1: TOKO A914BYW-2R2M (D52LC SERIES) LOAD CURRENT (mA) 100 95 90 85 80 75 70 1 100 1000 3411 TA01 10 VIN = 3.3V VOUT = 2.5V fO = 1MHz Burst Mode OPERATION |
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