PRESS RELEASE - Linear Technology -LTC3775: Wide Input Voltage Range Low Minimum On-Time Synchronous Step-Down DC/DC Controller

rwang — Tue, 08 Dec 2009 06:16:15 GMT

Current Revision posted to Documents by rwang on 12/8/2009 6:16:15 AM

Milpitas, California – November 4, 2009

MILPITAS, CA – November 4, 2009 – Linear Technology Corporation announces the LTC3775EUD#PBF.LTC3775EUD#PBF., a low minimum on-time wide input voltage range synchronous step-down DC/DC switching regulator controller that drives all N-channel power MOSFET stages. With less than a 30ns minimum on-time, the LTC3775EUD#PBF.LTC3775EUD#PBF. is well suited for high step-down ratios. The 4.5V to 38V input range encompasses a wide variety of applications, including most intermediate bus voltages and battery chemistries. The powerful onboard MOSFET gate drivers allow the use of high power external MOSFETs to produce output currents up to 20A with output voltages that range from 0.6V to 80% of the input voltage, making the LTC3775 ideal for automotive, industrial, medical, datacom and telecom applications.

A constant-frequency, leading edge modulation, voltage mode line feed forward architecture provides a selectable fixed or phase-lockable (PLL) frequency from 250kHz to 1MHz. Output current sensing is accomplished by monitoring the current in both the top-side and bottom-side MOSFET, allowing cycle-by-cycle control of the inductor current. In addition, the LTC3775EUD#PBF.LTC3775EUD#PBF. has adjustable soft-start to control the turn-on time and manage inrush current. Selectable pulse skip mode or forced continuous mode is user controlled to optimize light load efficiency. The LTC3775EUD#PBF.LTC3775EUD#PBF. features a precision 0.6V reference with an accuracy of ±0.75% over a -40°C to 125°C operating temperature range.

The LTC3775EUD#PBF.LTC3775EUD#PBF. is available in a thermally enhanced 3mm x 3mm QFN-16 package. The LTC3775EUD#PBF.LTC3775EUD#PBF. operates from -40°C to 85°C with the 1000-piece price starting at $1.79 each. The LTC3775I industrial grade version operates from -40°C to 125°C, with a 1,000-piece price that starts at $2.09 each. Both versions are available from stock. For more information, visit www.linear.com.

Summary of Features: LTC3775

VIN Range: 4.5V to 38V
VOUT Range: 0.6V to 0.8VIN
Low Minimum On-Time < 30ns
Strong Onboard N-Channel MOSFET Driver
Leading Edge Modulation Voltage Mode Control
Line Feedforward Compensation
Sense Resistor or RDS(ON) Current Sensing
Programmable Cycle by Cycle Current Limit
Phase-Lockable Fixed Frequency from 250kHz to 1Mhz
Programmable Soft-Start
±0.75% Reference Voltage Accuracy over -40oC to +125oC

Tags: Technology, pt:dc/dc_controller, sp:linear, at:press_release, tc:power_management