Intersil Unveils First USB-C Buck-Boost Voltage Regulator

Intersil ISL95338

Single-chip ISL95338 replaces two converters, enables USB PD3.0 bidirectional voltage regulation for tablets, ultrabooks and power banks

Intersil, a subsidiary of Renesas Electronics Corporation announced the industry's first buck-boost voltage regulator for tablets, ultrabooks, power banks, and other mobile devices using the reversible USB Type-C™ connector. 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 24 V. The ISL95338 can also convert a wide range of DC power sources to a regulated 20 V at its power adapter input. The ISL95338 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.

Intersil - ISL95338

The single-chip ISL95338 replaces two voltage converters currently used for bidirectional buck and boost modes to reduce a customer's bill of materials (BOM) cost by 50%. It leverages Intersil's patented R3™ modulation technology to deliver acoustic noise-free operation, superior light-load efficiency and ultra-fast transient response. Intersil's 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 5 V to 20 V 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.

Key Features and Specifications of ISL95338

  • Provides bidirectional buck, boost, and buck-boost operation
  • In forward mode, input voltage range is 3.8 V to 24 V and output voltage is up to 20 V with no dead zone
  • Up to 1 MHz switching frequency, and automatically reduces switching frequency with no audible acoustic noise when charger is in DCM mode
  • Programmable soft-start
  • LDO output for VDD and VDDP
  • System status alert function, and bidirectional internal discharge function
  • Active switching for negative voltage transitions
  • Bypass mode in both directions, forward mode enable and reverse mode enable
  • Fast swap allows one port to quickly swap from source to sink
  • Bidirectional internal input/output node discharge
  • SMBus and auto-increment I2C compatible
  • Full protection against undervoltage, overvoltage, overcurrent, and overtemperature

Pricing and Availability

The ISL95338 buck-boost voltage regulator is available now in a 4 mm × 4 mm TQFN package and is priced at $3.36 USD in 1k quantities.

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