HTCSEMI HT27403ARQZ

HT27403 is a feature-rich, easy-to-use synchronous buck controller offering high integration and excellent performance for high power density, high efficiency point-of-load DC-DC regulator solutions. The switching frequency is programmable via resistor from 200kHz to 1.2MHz, with integrated high-current MOSFET gate drivers and adaptive dead-time control, providing flexibility for optimizing solution size and improving conversion efficiency. The device features a 0.6V, 1% accurate reference voltage and a 30ns minimum high-side MOSFET on-time, enabling high accuracy and low output voltage. Lossless inductor DCR current sensing combined with remote inductor temperature sensing using a cost-effective 2N3904 BJT provides highly accurate thermally compensated overcurrent protection. The controller incorporates a conventional voltage-mode control loop with a high gain-bandwidth error amplifier and PWM input voltage feed-forward, simplifying compensation design and delivering excellent transient response across the full input voltage and load current range. Forced PWM operation eliminates frequency variation, helping to reduce EMI in sensitive applications. An open-drain power-good indicator supports power rail sequencing and fault reporting. Additional features include programmable system-level thermal shutdown, output voltage remote sensing, configurable soft-start, monotonic startup with pre-biased loads, integrated bias supply LDO, external power tracking, precision enable UVLO with programmable hysteresis, and frequency synchronization for beat-frequency-sensitive and multi-regulator applications. The device is housed in a 4mm × 4mm, 0.5mm pitch thermally enhanced UQFN package.

• Up to 97% efficiency, up to 93% duty cycle
• 3V to 20V wide input voltage range
• 200kHz to 1.2MHz programmable switching frequency range
• Inductor DCR-based overcurrent protection with thermal compensation
• 0.6V reference voltage with ±1% feedback accuracy
• 30ns minimum on-time for low output voltage applications
• Integrated high-current MOSFET driver
• Adaptive dead-time control
• Ultra-fast line and load transient response
• High gain-bandwidth error amplifier
• PWM line feedforward
• Integrated bias supply LDO sub-regulator
• Programmable system-level overtemperature protection
• Precision enable via hysteresis
• Frequency synchronization
• Monotonic pre-bias startup
• Programmable soft-start with tracking
• Output voltage remote sensing
• Open-drain power-good indicator
• 4mm × 4mm ultra-thin QFN package

• DC-DC converters and point-of-load modules
• Telecom infrastructure
• Embedded computing, servers, and storage