As mobile power supplies pursue efficient, fast charging and miniaturization, VBsemi's VBQA1401 has become a key component for improving mobile power performance with its ultra-low on-resistance, high current carrying capacity and compact packaging.

 1. Core architecture of mobile power supply

The mobile power supply consists of a battery cell, a power management chip, a charging and discharging module, and a protection circuit. When working, the external power is stored in the battery cell through the charging module, and the battery cell is then boosted by the discharging module to power the device. MOS tubes, as switching elements in the charging and discharging circuit, directly affect the efficiency and reliability of the mobile power supply.

 2. Key Applications of VBQA1401

1. Efficient charging control

The ultra-low on-resistance (1mΩ) of the VBQA1401 significantly reduces charging losses and improves efficiency. Its 100A current carrying capacity supports fast charging and reduces heat generation. For example, it can shorten the charging time by 5-10 minutes in 20W fast charging.

(II) Synchronous rectification boost

In the discharge boost circuit, the fast switching characteristics of VBQA1401 and the 40V withstand voltage value enable efficient conversion from 3.7V to 5V/9V, with a boost efficiency exceeding 95%, extending the use time of the mobile power bank.

3. Multiple security protections

The VBQA1401 has a built-in body diode to suppress reverse voltage, and a fast response protection circuit in case of overcurrent. The ±20V gate voltage range ensures stable operation under abnormal fluctuations.

 3. Advantages of selection

1. Electrical performance adaptation

The 40V withstand voltage of VBQA1401 can meet the voltage requirements of most mobile power supplies, while the 100A current carrying capacity reserves space for future higher-power fast charging technologies. The 3V threshold voltage perfectly matches the driving signal of mainstream PMICs, ensuring reliable conduction and cutoff.

(II) Packaging and heat dissipation optimization

The VBQA1401 in the DFN8 (5X6) package is compact, measuring only 5mm×6mm, and is highly adaptable to the narrow space inside the mobile power bank. Its bottom heat dissipation design is connected to the PCB through a large-area pad, which effectively conducts heat away, reduces the junction temperature, and ensures stable operation under high load.

3. Reliability assurance

Trench technology not only improves the switching speed, but also enhances the device's avalanche resistance, allowing the VBQA1401 to maintain stable performance during frequent charge and discharge cycles. Its rated parameters remain consistent within the temperature range of -55℃ to 175℃, adapting to the use requirements under different environmental conditions.

 4. Application Prospects

As mobile power supplies develop towards higher power (such as 100W GaN fast charging) and powering multiple devices simultaneously, high-performance MOS tubes such as VBQA1401 will play a greater role. Its ultra-low on-resistance and high current capability can effectively deal with the heating problem caused by high-current fast charging, while the compact package makes it possible for high-density integrated design inside the mobile power supply. In the future, VBsemi will continue to optimize MOS tube technology to help the mobile power industry develop in a more efficient and portable direction.