LTC3603IUF#TRPBF

LTC3603 2.5A, 15V Monolithic Synchronous Step-Down Regulator Description Features n n n n n n n n n n n n n Wide Input Voltage Range: 4.5V to 15V 2.5A Output Current Low RDS(ON) Internal Switches: 45mΩ and 85mΩ Programmable Frequency: 300kHz to 3MHz Low Quiescent Current: 75µA 0.6V ±1% Reference Allows Precise, Low Output Voltage 99% Maximum Duty Cycle Adjustable Burst Mode® Clamp Synchronizable to External Clock Power Good Output Voltage Monitor Overtemperature Protection Overvoltage Protection Available in 16-Lead Thermally Enhanced eMSOP and 4mm × 4mm QFN Packages Applications Point-of-Load Supplies Portable Instruments n Communications Infrastructure n n The LTC®3603 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant-frequency, current mode architecture. It operates from an input voltage range of 4.5V to 15V and provides an adjustable regulated output voltage from 0.6V to 14.5V while delivering up to 2.5A of output current. The internal synchronous power switch with 45mΩ on-resistance increases efficiency and eliminates the need for an external Schottky diode. The switching frequency can either be set by an external resistor or synchronized to an external clock. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors. The LTC3603 can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference, while Burst Mode operation provides the highest efficiency at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requirements of the application. L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6498466, 6611131, 6177787, 5705919, 5847554. Typical Application 3.3V, 2.5A, 1MHz Step-Down Regulator Efficiency and Power Loss vs Load Current VIN 4.5V TO 15V 1nF 0.22µF 2.2µH PGOOD VOUT 3.3V 100µF 2.5A SW TRACK/SS SYNC/MODE VFB 105k 1000 85 100 80 75 POWER LOSS 70 PGND ITH EFFICIENCY 90 BOOST LTC3603 10000 POWER LOSS (mW) RT 4.32k 1µF PVIN INTVCC RUN 105k VIN = 12V 95 VOUT = 3.3V EFFICIENCY (%) 22µF 100 10 65 475k 60 0.001 10pF 3603 TA01 0.01 0.1 1 LOAD CURRENT (A) 1 10 3603 TA01b 3603fc For more information www.linear.com/LTC3603 1 LTC3603 Absolute Maximum Ratings (Note 1) PVIN Supply Voltage (DC)........................... –0.3V to 16V PVIN Supply Transient Voltage (