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LTC3891 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3891 Datasheet(HTML) 1 Page - Linear Technology |
1 / 26 page LTC3630 1 3630fb TYPICAL APPLICATION FEATURES DESCRIPTION High Efficiency, 65V 500mA Synchronous Step-Down Converter The LTC®3630 is a high efficiency step-down DC/DC converter with internal high side and synchronous power switches that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load. The LTC3630 can supply up to 500mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reduc- ing output ripple and component size. The LTC3630’s combination of Burst Mode® operation, integrated power switches, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents. With its wide input range of 4V to 65V, the LTC3630 is a robust converter suited for regulating a wide variety of power sources. Additionally, the LTC3630 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environ- ment. A feedback comparator output enables multiple LTC3630s to be paralleled in higher current applications. The LTC3630 is available in the thermally-enhanced 3mm × 5mm DFN and the MSE16 packages. Efficiency vs Load Current 4V to 65V Input to 3.3V Output, 500mA Step-Down Converter APPLICATIONS n Wide Operating Input Voltage Range: 4V to 65V n Synchronous Operation for Highest Efficiency n Internal High Side and Low Side Power MOSFETs n No Compensation Required n Adjustable 50mA to 500mA Maximum Output Current n Low Dropout Operation: 100% Duty Cycle n Low Quiescent Current: 12μA n Wide Output Range: 0.8V to VIN n 0.8V ±1% Feedback Voltage Reference n Precise RUN Pin Threshold n Internal and External Soft-Start n Programmable 1.8V, 3.3V, 5V or Adjustable Output n Few External Components Required n Low Profile (0.75mm) 3mm × 5mm DFN and Thermally-Enhanced MSE16 Packages n Industrial Control Supplies n Medical Devices n Distributed Power Systems n Portable Instruments n Battery-Operated Devices n Automotive n Avionics L, LT, LTC, LTM, Burst Mode, 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. SW VIN 4V TO 65V LTC3630 47μH 100μF 2 3630 TA01a 2.2μF VOUT 3.3V 500mA GND VFB SS VPRG2 RUN VPRG1 ISET FBO VIN LOAD CURRENT (mA) 50 70 90 100 0.1 10 100 1000 3630 TA01b 30 1 80 60 40 VOUT = 3.3V VIN = 12V VIN = 65V ISET = 220kΩ||220pF ISET = OPEN |
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