USB-C buck-boost voltage regulator

October 12, 2017 // By Graham Prophet
Intersil, now part of of Renesas, has designed the single-chip ISL95338, a buck-boost voltage regulator for tablets, ultrabooks, power banks, and other mobile devices using the reversible USB Type-C connector. It replaces two converters and enables USB PD3.0 bidirectional voltage regulation.

The ISL95338 bidirectional voltage regulator accepts input power from a wide range of DC power sources - AC/DC power adapters, USB power delivery (PD3.0) ports, travel adapters, power banks - and converts it to a regulated voltage up to 24V. The part can also convert a range of DC power sources to a regulated 20V at its power adapter input. The regulator supports the USB-C ecosystem with buck-mode, boost-mode, and buck-boost mode, and is flexible enough to use in any USB-C power management application.


The single-chip ISL95338 replaces two voltage converters currently used for bidirectional buck and boost modes to reduce a bill of materials (BOM) cost by 50%. It uses Intersil’s R3 modulation technology to deliver acoustic noise-free operation, light-load efficiency and ultra-fast transient response. R3 extends battery life by combining the best features of fixed-frequency pulse width modulation (PWM) and hysteretic PWM to maximize power efficiency. The ISL95338 is also USB 3.1-compliant and provides serial communication through SMBus/I2C, allowing designers to program several input/output current and voltage slew rate settings to create a customized solution.


The ISL95338 is fully compliant to the USB PD3.0 standard and supports programmable power supply (PPS) fast charging with bidirectional 5V to 20V buck, boost or buck-boost modes. Multiple ISL95338 ICs can be combined with the ISL95521A combo battery charger or ISL9238 buck-boost battery charger to enable simultaneous multiport USB-C charging. The ISL95338 can also be used with the R9A02G011 USB PD controller and RAJ240045 fuel gauge IC for a complete USB-C power delivery solution.


In a 4 x 4 mm TQFN package it is priced at $3.36 USD in 1k quantities.




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