60V/600mA, 1.25MHz/550kHz Asynchronous Step Down Converter

The HT7463C/D is a current mode buck converter. With a wide input range from 4.5V to 60V, the HT7463C/D is suitable for a wide range of applications such as power conditioning from unregulated sources. Having a low internal switch typical RDSON value of 0.9Ω, the device has a good operating typical efficiency value of 85% and the added advantage of reduced junction temperature. The operating frequency is fixed at 1250/550kHz for the HT7463C/HT7463D respectively. The HT7463C allows the use of small external components while still being able to have low output voltage ripple. A soft-start function can be implemented using the enable pin and by connecting an external RC circuit allowing the user to tailor the soft-start time to a specific application.

Features:

• wide input voltage range 4.5V to 60V
• 60V / 0.9Ω internal power MOSFET
• 600mA peak output current
• up to 90% efficiency
• 1.25MHz (HT7463C) and 550kHz (HT7463D) fixed operating frequency
• ultra low shutdown current < 1μA
• output short circuit protection
• thermal shutdown protection

Specification:

• input voltage: 60V
• output voltage: 0.8V~36V
• output current: 0.6A
• switching frequency: 550kHz
• current limit: 1.2A
• accuracy: 0.794V±2.0%
• shutdown current: 1.0μA
• operationn current: 0.5mA
• efficiency: 95%
• mode: PWM/PSM
• case: SOT23-6