LTC3602 2.5A, 10V, Monolithic Synchronous Step-Down Regulator FEATURESDESCRIPTION n Wide Input Voltage Range: 4.5V to 10V The LTC®3602 is a high effi ciency, monolithic synchronous, n 2.5A Output Current step-down DC/DC converter utilizing a constant-frequency, n Low RDS(ON) Internal Switches: 65m Ω and 90m Ω current mode architecture. It operates from an input voltage n Programmable Frequency: 300kHz to 3MHz range of 4.5V to 10V and provides an adjustable regulated n Low Quiescent Current: 75μA output voltage from 0.6V to 9.5V while delivering up to n 0.6V ±1% Reference Allows Low Output Voltage 2.5A of output current. The internal synchronous power n 99% Maximum Duty Cycle switch with 65mΩ on-resistance increases effi ciency n Adjustable Burst Mode® Clamp and eliminates the need for an external Schottky diode. n Synchronizable to External Clock The switching frequency can either be set by an external n Power Good Output Voltage Monitor resistor or synchronized to an external clock. OPTI-LOOP® n Overtemperature Protection compensation allows the transient response to be optimized n Available in 16-Lead Exposed TSSOP and over a wide range of loads and output capacitors. 4mm × 4mm QFN Packages The LTC3602 can be confi gured for either Burst Mode op- eration or forced continuous operation. Forced continuous APPLICATIONS operation reduces noise and RF interference, while Burst Mode operation provides the high effi ciency at light loads. n Point-of-Load Supplies In Burst Mode operation, external control of the burst n Portable Instruments clamp level allows the output voltage ripple to be adjusted n Server Backplane Power according to the requirements of the application. n Battery-Powered Devices , LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION3.3V, 2.5A, 1MHz Step-Down RegulatorEffi ciency and Power Loss vs Load Current VIN 100 10000 4.5V TO 10V VIN = 7V 95 EFFICIENCY 22μF 1μF PV 90 1000 POWER LOSS (mW) IN INTVCC RUN BOOST 85 0.22μF POWER LOSS RT 80 100 2.2μH 105k VOUT PGOOD SW 3.3V 75 LTC3602 EFFICIENCY (%) 2.5A 100μF 70 10 TRACK/SS 4.32k 65 ITH PGND 1nF SYNC/MODE V 60 1 FB 475k 0.01 0.1 1 10 LOAD CURRENT (A) 22pF 3602 TA01b 105k 3602 TA01 3602fb 1
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