Everanalog IC design EA3058QDR

The EA3058 is a 4-CH power management IC for applications powered by one Li-Ion battery or a DC 5V adapter. It integrates four synchronous buck regulators and can provide high efficiency output at light load and heavy load operation. The internal compensation architecture simplifies the application circuit design. Besides, the independent enable control makes the designer have the greatest flexibility to optimize timing for power sequencing purposes. The EA3058 is available in a 24 pin QFN 4x4 package. Each of the buck regulators can be operated at PFM/PWM mode. If the output current is less than 150mA (typ.), the regulators automatically enters the PFM mode. The output voltages and output ripples at PFM mode are higher than the output voltages and output ripples at PWM mode. But at very light load, the PFM mode operation provides higher efficiency than PWM mode operation. The EA3058 is a high efficiency Power Management IC which is designed for IPC and OTT applications. It incorporates four 2A synchronous buck regulators and can be controlled by individual EN pins. The start-up time for each channel can be programmed. In order to reduce the input ripple current, the EA3058 applied 180° phases shifted architecture. Buck1 and Buck3 have the same phase and Buck2 and Buck4 are 180° out of phase. This architecture allows the system board has less ripple current, and thus can reduce EMI. The EA3058 internal four regulators have their own cycle-by-cycle current limit circuits. When the inductor peak current exceeds the current limit threshold, the output voltage starts to drop until FB pin voltage is below the threshold, typically 30% below the reference. Once the threshold is triggered, the switching frequency is reduced to 350KHz (typ.). The EA3058 will automatically disabled if the die temperature is higher than the thermal shutdown threshold point. To avoid unstable operation, the hysteresis of thermal shutdown is about 30℃.

• IPC
• OTT