LTC3872 Datasheet | Linear Technology

No RSENSE Current Mode Boost DC/DC Controller Features n No Current Sense Resistor Required n VOUT up to 60V n Constant Frequency 550k Hz Operation n Internal Soft-Start and Optional External Soft-Start n Adjustable Current Limit n Pulse Skipping at Light Load n VIN Range: 2.75V to 9.8V n ±1.5% Voltage Reference Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages Applications n Tele Power Supplies n 42V Automotive Systems n 24V Industrial Controls n IP Phone Power Supplies Description The LTC®3872 is a constant frequency current mode boost DC/DC controller that drives an N-channel power MOSFET and requires very few external ponents. The No RSENSETM architecture eliminates the need for a sense resistor, improves efficiency and saves board space. The LTC3872 provides excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. It incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.3V. High switching frequency of 550k Hz allows the use of a small inductor. The LTC3872 is available in an 8-lead low profile (1mm) Thin SOTTM package and 8-pin 2mm × 3mm DFN package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No RSENSE and Thin SOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. POWER LOSS (W) Typical Application High Efficiency 3.3V Input, 5V Output Boost Converter 1.8n F 17.4k 47p F VIN IPRG VFB RUN/SS NGATE 11k 1% 1n F 34.8k 1% 1µH D1 M1 100µF ×2 VIN 3.3V 10µF VOUT 5V 2A 3872 TA01 EFFICIENCY...