LTC3630 High Efficiency, 65V 500mA Synchronous Step-Down Converter FeaTuresDescripTion n Wide Operating Input Voltage Range: 4V to 65V The LTC®3630 is a high efficiency step-down DC/DC n Synchronous Operation for Highest Efficiency converter with internal high side and synchronous power n Internal High Side and Low Side Power MOSFETs switches that draws only 12μA typical DC supply current n No Compensation Required while maintaining a regulated output voltage at no load. n Adjustable 50mA to 500mA Maximum Output Current The LTC3630 can supply up to 500mA load current and n Low Dropout Operation: 100% Duty Cycle features a programmable peak current limit that provides n Low Quiescent Current: 12µA a simple method for optimizing efficiency and for reduc- n Wide Output Range: 0.8V to VIN ing output ripple and component size. The LTC3630’s n 0.8V ±1% Feedback Voltage Reference combination of Burst Mode® operation, integrated power n Precise RUN Pin Threshold switches, low quiescent current, and programmable peak n Internal and External Soft-Start current limit provides high efficiency over a broad range n Programmable 1.8V, 3.3V, 5V or Adjustable Output of load currents. n Few External Components Required n Low Profile (0.75mm) 3mm × 5mm DFN and With its wide input range of 4V to 65V, the LTC3630 is a Thermally-Enhanced MSE16 Packages robust converter suited for regulating a wide variety of power sources. Additionally, the LTC3630 includes a precise applicaTions run threshold and soft-start feature to guarantee that the n power system start-up is well-controlled in any environ- Industrial Control Supplies n ment. A feedback comparator output enables multiple Medical Devices n LTC3630s to be paralleled in higher current applications. Distributed Power Systems n Portable Instruments The LTC3630 is available in the thermal y-enhanced n Battery-Operated Devices 3mm × 5mm DFN and the MSE16 packages. n Automotive L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks n Avionics and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical applicaTionEfficiency vs Load Current 100 VOUT = 3.3V 4V to 65V Input to 3.3V Output, 500mA Step-Down Converter VIN = 12V 90 47µH V VOUT 80 IN VIN SW 4V TO 65V 3.3V 100µF 2.2µF LTC3630 500mA ×2 70 RUN V V FB IN = 65V SS 60 VPRG1 VPRG2 EFFICIENCY (%) FBO I 50 SET GND 3630 TA01a 40 ISET = 220kΩ||220pF ISET = OPEN 300.1 1 10 100 1000 LOAD CURRENT (mA) 3630 TA01b 3630fd For more information www.linear.com/LTC3630 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
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