Renesas Electronics Corporation

ISL784x4 Half-Bridge Drivers

Renesas' ISL784x4 100 V boot, 4 A peak, half-bridge MOSFET driver family with adaptive dead time control

Image of Renesas' ISL784x4 Half-Bridge DriversRenesas' ISL784x4 is ideal for high current DC/DC applications that require high conversion efficiency. ISL784x4 offers very strong gate drive with peak sourcing current of 3 A and peak sinking current of 4 A. The strong gate drive allows these devices to rapidly switch MOSFETs with large gate capacitance, thereby reducing switching losses. ISL78424 and ISL78434 offer independent source and sink pins so the user can optimize the switching characteristics of the DC/DC conversion switching-node to improve EMI while limiting the negative impact to DC/DC conversion efficiency. ISL784x4 includes adaptive dead time control that allows it to minimize excess dead time, which would otherwise lead to excess conduction losses and therefore reduced DC/DC conversion efficiency.

The ISL784x4 family offers drivers with either PWM input (ISL78424/ISL78444) or HI/LI input (ISL78434) styles, allowing the driver to accept input from most DC/DC PWM controllers and microcontrollers. The ISL78444 driver is pin-compatible with prior generation Renesas driver, ISL78420, allowing for easy migration with minimal PCB redesign effort. ISL784x4 has voltage ratings that are ideal for 48 V automotive systems. Its switching node can tolerate 70 VDC up to 86 VDC for infrequent transients, such as load-dump. Its boot node can tolerate 86 VDC up to 100 VDC for infrequent transients.

Features and Benefits
  • On-chip 3 Ω bootstrap FET switch
  • Independent HI/LI inputs (ISL78434)
  • Tri-level PWM input (ISL78424, ISL78444)
  • 3 A sourcing and 4 A sinking output current
  • Programmable dead time delay with single resistor
  • Patented gate-sensed adaptive dead time control provides shoot-through protection and minimizes dead time
  • Unique tri-level PWM input for integration with Renesas multiphase controllers (for example, ISL78225 and ISL78226)
  • Minimum phase voltage: -10 V
  • Maximum phase voltage: +86 V
  • Wide supply range: 8 V to 18 V
  • Bootstrap supply maximum voltage: 100 V
  • Bootstrap and VDD under voltage lockout (UVLO)
  • Separate source/sink pins at driver outputs (ISL78424, ISL78434)
Applications
  • Automotive half-bridge and 3-phase motor driver
  • Multi-phase boost (with ISL78220 and ISL78225 controllers)
  • 12 V to 24 V and 12 V to 48 V bidirectional DC/DC (with ISL78226, ISL78224 controllers)

ISL784x4 Half Bridge Drivers

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
IC GATE DRVR HALF-BRIDG 14HTSSOPISL78424AVEZ-T7AIC GATE DRVR HALF-BRIDG 14HTSSOP1 - Immediate$7.10View Details
IC GATE DRVR HALF-BRIDG 14HTSSOPISL78434AVEZ-T7AIC GATE DRVR HALF-BRIDG 14HTSSOP81 - Immediate$7.10View Details
IC GATE DRVR HALF-BRIDG 14HTSSOPISL78444AVEZ-T7AIC GATE DRVR HALF-BRIDG 14HTSSOP429 - Immediate$7.10View Details

Evaluation Boards

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
EVAL BOARD FOR ISL78424ISL78424EVAL3ZEVAL BOARD FOR ISL784243 - Immediate$298.67View Details
EVAL BOARD FOR ISL78434ISL78434EVAL1ZEVAL BOARD FOR ISL784347 - Immediate$298.67View Details
EVAL BOARD FOR ISL78444ISL78444EVAL1ZEVAL BOARD FOR ISL784443 - Immediate$298.67View Details
Published: 2018-11-13