52V/600mA, 1.25MHz/550kHz Asynchronous Step Down Converter

The HT7463A/B is a current mode buck converter. With a wide input range from 4.5V to 52V, the HT7463A/B 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 HT7463A/HT7463B respectively. The HT7463A allows the use of small external components while still being able to have low output voltage ripple.

Features:

• wide input voltage range 4.5V to 52V
• 52V / 0.9Ω internal power MOSFET
• 600mA peak output current
• up to 90% efficiency
• 1.25MHz (HT7463A) and 550kHz (HT7463B) fixed operating frequency
• ultra low shutdown current < 1μA
• output short circuit protection
• thermal shutdown protection

Specification:

• input voltage: 52V
• output voltage: 1.0V~36V
• output current: 0.6A
• switching frequency: 1250kHz
• current limit: 1.0A
• accuracy: 0.794V±2.0%
• shutdown current: 1.0μA
• operationn current: 0.7mA
• efficiency: 95%
• mode: PWM/PSM
• case: SOT23-6