Milpitas, Calif. - Intersil Corporation's Endura ISL6614 is a two-channel synchronous-buck MOSFET driver IC designed with advanced protection features for high-current DC/DC converters in datacom, telecom, point-of-load and computing applications. It's designed to provide the highest protection while significantly reducing board space, parts count and costs to implement a multi-phase power solution.
"The ISL6614 offers exceptional performance and cost savings in a small SOIC or near-chip-scale 4-by-4 mm QFN package," said Cindy Drapcho, vice president of Power Products. "Our pre-enable over-voltage protection is the industry's first over-voltage protection function that protects against over-voltage events, such as upper FET shorts, before the power supply is up and running. This protection feature prevents the load voltage from rising to dangerous levels that can potentially cause catastrophic damage."
The driver can sink up to 3 amps of gate current for synchronous-buck configured n-channel MOSFETs. Its pre-enable over-voltage protection function becomes operational before the FET driver VCC exceeds its turn-on (rising) threshold. The ISL6614 looks for over-voltage events such as upper MOSFET shorts immediately on power-up. If such an event is detected, its PHASE node is connected to the gate of the low-side MOSFET, limiting the output voltage of the converter to the gate-to-source threshold voltage of the low-side MOSFET. The ISL6614 drives both upper and lower MOSFET gates over a range of 5 to 12 V.
Its three-state PWM input feature, working together with the company's multi-phase PWM controllers, prevents a negative transient on the output voltage when the output is shut down. This feature eliminates the need for a Schottky diode (used in some systems) to protect the load from reverse output voltage events, further reducing the bill-of-materials cost versus competitors' drivers.
Advanced adaptive zero shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize the dead time. An over-temperature protection feature prevents failures resulting from excessive power dissipation by shutting off the outputs when their junction temperature exceeds +150°C. The driver resets once its junction temperature returns to +108°C. The ISL6614 also has a 36-V bootstrap pin rating that enables the MOSFET drivers to withstand switching node spikes.
The ISL6614 is available now in a choice of SOIC (ISL6614CB) or QFN (ISL6614CR) packages. The suggested resale price for 100- to 999-unit quantities is $1.53 each for the ISL6614CB and $1.63 each for the ISL6614CR, both in 100- to 999-unit quantities. ICs are available on tape and reel and in Pb-free versions (ISL6614CBZ and ISL6614CRZ).