Datasheet LTC3639 (Analog Devices)

LTC3639 High Efficiency, 150V 100mA Synchronous Step-Down Regulator
FEATURES DESCRIPTION
n
Wide Operating Input Voltage Range: 4V to 150V
The LTC®3639 is a high efficiency step-down DC/DC n
Synchronous Operation for Highest Efficiency
regulator 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 10mA to 100mA Maximum Output
The LTC3639 can supply up to 100mA load current and
Current
features a programmable peak current limit that provides n Low Dropout Operation: 100% Duty Cycle a simple method for optimizing efficiency and for reduc- n Low Quiescent Current: 12µA ing output ripple and component size. The LTC3639’s n Wide Output Range: 0.8V to VIN combination of Burst Mode® operation, integrated power n 0.8V ±1% Feedback Voltage Reference switches, low quiescent current, and programmable peak n Precise RUN Pin Threshold current limit provides high efficiency over a broad range n Internal or External Soft-Start of load currents. n Programmable 1.8V, 3.3V, 5V or Adjustable Output n Few External Components Required With its wide input range of 4V to 150V and programmable n Programmable Input Overvoltage Lockout overvoltage lockout, the LTC3639 is a robust regulator n Thermally Enhanced High Voltage MSOP Package suited for regulating from a wide variety of power sources. Additionally, the LTC3639 includes a precise run threshold
APPLICATIONS
and soft-start feature to guarantee that the power system start-up is well-controlled in any environment. n Industrial Control Supplies n The LTC3639 is available in a thermally enhanced high Medical Devices n voltage-capable 16-lead MSE package with four missing pins. Distributed Power Systems L n , LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks Portable Instruments of Linear Technology Corporation. All other trademarks are the property of their respective n Battery-Operated Devices owners. n Automotive n Avionics
TYPICAL APPLICATION Efficiency and Power Loss vs Load Current
100 VOUT = 5V EFFICIENCY 90
5V to 150V Input to 5V Output, 100mA Step-Down Regulator
80 POWER LOSS (mW) 470µH V 70 1000 V OUT IN V V IN SW 5V 5V TO 150V IN = 12V 1µF 60 V LTC3639 10µF 100mA IN = 36V 200V V 50 IN = 72V 100 RUN VFB VIN = 150V OVLO SS 40 EFFICIENCY (%) VPRG2 VPRG1 30 POWER LOSS 10 GND 20 3639 TA01a 10 1 00.1 1 10 100 LOAD CURRENT (mA) 3639 TA01b 3639fc For more information www.linear.com/LTC3639 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 Revision History Typical Application Related Parts