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LTC3775

Linear Technology
Part Number LTC3775
Manufacturer Linear Technology
Description High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller
Published Dec 5, 2009
Detailed Description FEATURES n Wide VIN Range: 4.5V to 38V n Line Feedforward Compensation n Low Minimum On-Time: tON(MIN) < 30ns n Powerful...
Datasheet PDF File LTC3775 PDF File

LTC3775
LTC3775


Overview
FEATURES n Wide VIN Range: 4.
5V to 38V n Line Feedforward Compensation n Low Minimum On-Time: tON(MIN) < 30ns n Powerful Onboard MOSFET Drivers n Leading Edge Modulation Voltage Mode Control n ±0.
75%, 0.
6V Reference Voltage Accuracy Over Temperature n VOUT Range: 0.
6V to 0.
8VIN n Programmable, Cycle-by-Cycle Peak Current Limit n Sense Resistor or RDS(ON) Current Sensing n Programmable Soft-Start n Synchronizable Fixed Frequency from 250kHz to 1MHz n Selectable Pulse-Skipping or Forced Continuous Modes of Operation n Low Shutdown Current: 14μA Typical n Thermally Enhanced 16-Lead MSOP and 3mm × 3mm QFN Packages APPLICATIONS n Automotive Systems n Telecom and Industrial Power Supplies n Point of Load Applications LTC3775 High Frequency Synchronous Step-Down Voltage Mode DC/DC Controller DESCRIPTION The LTC®3775 is a high efficiency synchronous step-down switching DC/DC controller that drives an all N-channel power MOSFET stage from a 4.
5V to 38V input supply voltage.
A patented line feedforward compensation circuit and a high bandwidth error amplifier provide very fast line and load transient response.
High step-down ratios are made possible by a low 30ns minimum on-time, allowing extremely low duty cycles.
MOSFET RDS(ON) current sensing maximizes efficiency.
Alternatively, a sense resistor can be used for higher current limit accuracy.
Continuous monitoring of the voltages across the top and bottom MOSFETs allows cycle-by-cycle control of the inductor current, configurable by external resistors.
The soft-start function controls the duty cycle during start-up, providing a smooth output voltage ramp up.
The operating frequency is user programmable from 250kHz to 1MHz and can be synchronized to an external clock.
L, LT, LTC, LTM, Linear Technology, the Linear logo are registered trademarks, No RSENSE and UltraFast are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.
S.
Patents, including 5408150, ...


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