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The ISL78229 is an automotive grade (AEC-Q100 Grade 1), 2-phase 55V synchronous boost controller that simplifies the design of high power boost applications. It integrates strong half-bridge drivers, an analog/digital tracking input, comprehensive protection functions, and a PMBus interface for added control and telemetry.

ISL78229 enables a simple, modular design for systems requiring power and thermal scalability. It offers peak-current mode control for fast line response and simple compensation. Its synchronous 2-phase architecture enables it to support higher current while reducing the size of input and output capacitors. The integrated drivers feature programmable adaptive dead time control offering flexibility in power stage design. ISL78229 offers a 90° output clock and supports 1-, 2-, and 4-phases.

ISL78229 offers a highly robust solution for the most demanding environments. Its unique soft-start control prevents large negative current even in extreme cases, such as a restart under high output prebias on high volume capacitances. It also offers two levels of cycle-by-cycle overcurrent protection, average current limiting, input OVP, output UVP/OVP, and internal OTP. A thermistor input is provided for external OTP for the power-stage elements. In the event of a fault, the ISL78229 offers individually programmable latch-off or hiccup recovery for each fault type.

Also integrated are several functions that ease system design. A unique tracking input is available that can control the output voltage, allowing it to track either a digital duty cycle (PWM) signal or an analog reference. ISL78229 provides input average current limiting so the system can deliver transient bursts of high load current while limiting the average current to avoid overheating. Finally, the ISL78229 PMBus interface provides fault reporting, telemetry, and system control to support functional safety qualification.

Key Features

• Input/output voltage range: 5V to 55V, withstands 60V transients
• Supports synchronous or standard boost topology
• Peak current mode control with adjustable slope compensation
• Secondary average current control loop
• Integrated 5V 2A sourcing/3A sinking N-channel MOSFET drivers
• Switching frequency: 50kHz to 1.1MHz per phase
• External synchronization
• Programmable minimum duty cycle
• Programmable adaptive dead time control
• Optional diode emulation and phase dropping
• PWM and analog track function
• Forced PWM operation with negative current limiting and protection
• Comprehensive protection/fault reporting
• Selectable hiccup or latch-off fault response
• I2C/PMBus compatible digital interface
• AEC-Q100 qualified, Grade 1: -40°C to +125°C
• 6mm x 6mm 40 Ld WFQFN (Wettable Flank QFN) package

Applications

• Automotive power system (e.g., 12V to 24V, 12V to 48V, etc.)
  • Trunk audio amplifier
  • Start-stop system
  • Automotive boost applications
• Industrial and telecommunication power supplies