Alpha and Omega Semiconductor Announces New P-Channel MOSFET for USB PD Load Switch

Alpha and Omega Semiconductor Limited (AOS) (Nasdaq: AOSL), a designer, developer and global supplier of a broad range of power semiconductors and power ICs, today introduced AONR21357, the initial product in this P-Channel family.  The new AONR21357 uses the improved P-Channel MOSFET process to achieve low power loss and reliable startup. The new device rated at -30V drain-source breakdown voltage (BVDss) and -25V gate-source voltage.  It features a maximum on-resistance (RDS(ON)) of 12.3mohm under VGS = -4.5V, and a thermally enhanced 3x3mm DFN package.  The new P-Channel MOSFET is ideal for load switch applications in Notebook Adapter-In/ Battery In sockets.

USB Type-C is becoming the de-facto interface for the latest PCs and mobile designs. With that, the USB-PD standard is implemented to cover various power delivery requirements for many portable devices. The load switch circuit is used to switch on/off the power bus according to the power management proxy. The new MOSFET used as the load switch offers extended input/output voltage range, and is robust and reliable enough to accommodate the possible working conditions. AOS’ enhanced P-Channel technology offers robustness toward linear mode operation, and low Miller’s Plateau (<3.5V) to cover the possible USB-PD voltages.

‟The AONR21357 comprehensively addresses the need for -30VDS and -25VGS discrete P-Channel MOSFET.  High performance such as low Miller Plateau and low loss of turn-on switching behaviors ensures reliable and secure safe operation area, allowing designers to take advantage of simple design with P-Channel MOSFETs,” said Rack Tsai, Director of Marketing for low voltage MOSFET product line in AOS.

Technical Highlights

The new product family offers various RDS(ON) levels in combination with multiple package options.

Part Number Package VDS (V) VGS (±V) RDS(ON) (mΩ max)* at VGS = Available
10V 4.5V
AONR21357 DFN3x3 -30 25 7.8 12.3 Now
AONR21307 DFN3x3 -30 25 12 20 Q4-2017
AONR21321 DFN3x3 -30 25 18 26 Q1-2018
AONS21357 DFN5x6 -30 25 7.8 12.3 Now
AOSP21357 SO-8 -30 25 8.5 13 Now
AONS21307 DFN5x6 -30 25 12 20 Q4-2017


Pricing and Availability
The AONR21357 is immediately available in production quantities with a lead-time of 12 weeks. The unit price of 1,000 pieces is $0.60.