The HT7178 is a high-power density, fully integrated synchronous boost converter with a 16mΩ power switch and a 16mΩ rectifier switch to provide a high efficiency and small size solution in portable systems. The HT7178 has wide input voltage range from 2.7 V to 20 V to support applications with single cell, two cell Lithium batteries and 12V lead-acid batteries. The device has 14A switch current capability and can provide an output voltage up to 20V.
The HT7178 uses adaptive constant off-time peak current control topology to regulate the output voltage. In moderate to heavy load condition, it works in the PWM mode. In light load condition, the device has two operation modes selected by the MODE pin. One is PFM mode to improve the efficiency and another one is the forced PWM mode to avoid application problems caused by low switching frequency. The switching frequency in the PWM mode is adjustable ranging from 200kHz to 1.4MHz by an external resistor.
HT7178 could isolate the output from input side when shut down by a gate drive output disconnecting external FET, so that the load current consumption could be limited.
The HT7178 also implements a programmable soft-start function and an adjustable switching peak current limit function. In addition, the device provides 22V output overvoltage protection, cycle-by-cycle overcurrent protection, and thermal shutdown protection.