The FAN1577A is a high-efficiency, voltage-mode, dual-channel, synchronous DC/DC PWM controller for two independent outputs. The two channels are operated out of phase. The internal reference voltage is trimmed to 0.7V±1.0%. It is connected to the error amplifier's positive terminal for voltage feedback regulation. A soft-start circuit ensures the output voltage can be gradually and smoothly increased from zero to its final regulated value. The soft-start pin can also be used for chip-enable function. When two soft-start pins are grounded, the chip is disabled, and the total operation current can be reduced to under 0.7mA. The fixed-frequency is programmable from 61kHz to 340kHz. It also includes features such as programmable over-current protection (OCP) and output over-voltage protection (OVP).
The FAN1577A is a high-efficiency, voltage-mode, dual-channel synchronous DC/DC PWM controller designed for two independent outputs. It integrates two sets of internal MOSFET drivers and operates with channels out of phase to regulate power supplies for applications such as CPU and GPU Vcore.
| Maximum Input Supply Voltage | 15V |
|---|---|
| Package Type | 20-Lead, Small-Outline Package |
| Internal Reference Voltage | 0.7V ±1.0% |
| Switching Frequency Range | 61kHz to 340kHz |
| Operating Junction Temperature Max | +125°C |
The chip is disabled when both soft-start pins (SS1/ENB and SS2/ENB) are grounded.
The standby current in the disabled state is 0.7mA to 1.0mA.