Product category:
Power Supply ICs and Controllers
News Release from: Vishay Siliconix | Subject: SiP41108/09/10
Edited by the Electronicstalk Editorial
Team on 01 December 2005
MOSFET drivers optimise efficiency
Three new high-speed half-bridge MOSFET driver ICs provide flexible gate drive levels to optimise efficiency, reduce component count and minimise expense in high-frequency high-current DC/DC supplies.
Three new high-speed half-bridge MOSFET driver ICs provide flexible gate drive levels to optimise efficiency, reduce component count and minimise expense in high-frequency high-current DC/DC synchronous rectifier buck power supplies The new MOSFET drivers operate with external N-channel MOSFETs
This article was originally published on Electronicstalk on 17 Jun 2003 at 8.00am (UK)
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Five new Little Foot Plus driver products are designed to simplify the use of N-channel MOSFETs in high-frequency buck regulators.
They are designed to provide gate drive voltages of 8 or 12, operate at switching frequencies up to 1MHz, and function in 5 to 48V systems, including power convertors and industrial and computing equipment.
The high-side driver of each device has an internal bootstrap diode to reduce external component count.
In the SiP41109, the gate drive voltage is supplied to the high-side driver by an integrated 80mA, 8V regulator and to the low-side driver by the supply voltage.
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In the SiP41110, the regulator supplies both high-side and low-side voltages.
In this way, designers can choose the gate drive voltage most suitable for achieving an optimal tradeoff between MOSFET conduction and switching loss for the chosen operating frequency.
Adaptive shoot-through protection in the drivers prevents simultaneous conduction of the external MOSFETs.
Undervoltage lockout holds off operation of the circuits until their supply voltages reach valid operating levels, and overtemperature protection disables the drivers if the die temperature exceeds 165C.
The SiP41108 provides several additional features, including an adjustable high-side propagation delay, a dedicated shutdown pin, and a synchronous MOSFET disable function for improved efficiency under certain operating conditions.
The SiP41108 is packaged in the lead (Pb)-free PowerPAK TSSOP-16.
The SiP41109 and SiP41110 are packaged in the lead (Pb)-free SOIC-8 and use the same pin-out as the popular HiP6601 and HiP6603 while delivering a 4x higher operating voltage of 48V and a better than 2x higher gate drive current.
As a result, designers can use the new devices to upgrade the voltage and current density of their devices without necessitating a board redesign.
Both the SiP41109 and SiP41110 provide a three-state PWM input, which also provides for output shutdown.
They enter shutdown mode when the PWM signal enters the tri-state window and remains within the shutdown window for more than 240ns.
If the PWM pin is left open, the pin is held to 2.5V by an internal voltage divider, which forces the three-state condition.
All three new devices are rated for operation over the -40 to +85C industrial temperature range.
Applications include multiphase DC/DC convertors, high-current and high-frequency synchronous buck convertors, asynchronous-to-synchronous adaptations and computer DC/DC convertors.
Samples and production quantities are available now, with lead times of seven weeks for larger orders.
Pricing for US delivery in 1000-piece quantities is $0.85 for the SiP41109 and SiP41110 and $0.90 for the SiP41108.
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