MOSFET Driver tolerates 100 V transients.
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Press Release Summary:
Model LTC4440 N-channel 80 V MOSFET driver, housed in SOT-23 and 8-lead MSOP packages, offers peak pull-up output current of 2.4 A and 1.5 ohm pull-down output impedance. Unit reduces MOSFET gate drive fall and rise times to 7 ns and 10 ns, respectively, when driving 1,000 pF loads. Input logic signal is internally level-shifted to bootstrapped supply, which may function at up to 115 V above ground. Driver is rated for -40 to 85°C ambient temperatures.
Original Press Release:
Fast 100V MOSFET Driver in ThinSOT
MILPITAS, CA - October 23, 2003 - Linear Technology Corporation introduces the LTC4440, a 100V transient tolerant high-side N-channel MOSFET driver with powerful gate drivers that minimize switching losses in power supplies. Housed in ThinSOT (TM)(SOT-23) and 8-lead MSOP packages, the IC's 80V (100V transient) operation, peak pull-up output current of 2.4A and 1.5Ohm pull-down output impedance make it ideally suited for driving high gate capacitance, high voltage, high current standard threshold MOSFETs. The IC improves the efficiency and output power capability of a DC/DC converter by reducing MOSFET gate drive fall and rise times to 7ns and 10ns, respectively, when driving 1,000pF loads. The LTC4440 improves power supply performance in 48V telecom systems as well as distributed power systems in industrial and automotive applications.
The LTC4440 features supply independent TTL/CMOS compatible input thresholds. The input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 115V above ground. The IC contains both high side and low side undervoltage lockout circuits that disable and protect the external MOSFET when activated.
The LTC4440 is rated for extended temperature range operation from -40 ûC to 85 ûC ambient. Pricing starts at $1.75 each in 1,000-piece quantities.
Summary of Features: LTC4440
Wide Operating V IN Range up to 80V
Rugged Architecture Tolerant of 100V Transients
Powerful 1.5Ohm Driver Pull-Down
Powerful 2.4A Peak Current Driver Pull-Up
7ns, 10ns Fall and Rise Time (1000pF Load)
Small 6-Lead ThinSOT (SOT-23) and 8-Lead MSOP package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
READER SERVICE: Call toll-free 1-800-4-LINEAR (for literature only), or go to the company's web site: www.linear.com
Note: LT, AND LTC are registered trademarks of Linear Technology Corp
