Multiphase PMICs Raise Efficiency, Trim Footprint

Renesas Electronics’ latest programmable power management ICs (PMICs) claim to deliver the highest power efficiency and smallest footprint. The ISL91302B, ISL91301A, and ISL91301B PMICs are viable for powering supply rails in solid-state drives (SSDs), optical transceivers, and a wide range of consumer, industrial and networking devices. The ISL91302B dual/single output, multiphase PMIC provides up to 20A of output current and 94% peak efficiency in a 70-mm2 package.


The ISL91301A triple output and ISL91301B quad output PMICs both deliver up to 16A of output power with 94% peak efficiency. They leverage the company’s R5 Modulation Technology to provide fast single-cycle transient response, digitally tuned compensation, and a 6-MHz maximum switching frequency during load transients. These features enable designers to create boards with 2 mm x 2 mm, 1-mm low profile inductors, small capacitors, and only a few passive components.

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The PMICs also do not require external compensation components or external dividers to set operating conditions. Each device dynamically changes the number of active phases for optimum efficiency at all output currents.


ISL91302B: Available in three factory configurable options for one or two output rails.

  1. Dual-phase (2 + 2) configuration supporting 10A from each output
  2. Triple-phase (3 + 1) configuration supporting 15A from one output and 5A from the second output
  3. Quad-phase (4 + 0) configuration supporting 20A from one output
  • 7mm x 10mm for 4-phase design
  • Input supply voltage range of 2.5V to 5.5V
  • I2C or SPI programmable Vout from 0.3V to 2V
  • R5 modulator architecture balances current loads with smooth phase adding and dropping for power efficiency optimization
  • Provides 75μA quiescent current in discontinuous current mode (DCM)
  • Independent dynamic voltage scaling for each output
  • ±0.7% system accuracy for -10°C to +85°C with remote voltage sensing
  • Integrated telemetry ADC senses phase currents, output current, input/output voltages, and die temperature, enabling PMIC diagnostics during operation
  • Soft-start and fault protection against under voltage (UV), over voltage (OV), over current (OC), over temperature (OT), and short circuit


ISL91301A and ISL91301B PMICs: Available in two factory configurable options

  1. ISL91301A: dual-phase, three output rails configured as 2+1+1 phase
  2. ISL91301B: single-phase, four output rails configured as 1+1+1+1 phase
  • 4A per phase for 2.8V to 5.5V supply voltage
  • 3A per phase for 2.5V to 5.5V supply voltage
  • Small solution size: 7mm x 10mm for 4-phase design
  • I2C or SPI programmable Vout from 0.3V to 2V
  • Provides 62 μA quiescent current in DCM mode
  • Independent dynamic voltage scaling for each output
  • ±0.7% system accuracy for -10°C to +85°C with remote voltage sensing
  • Soft-start and fault protection against UV, OV, OC, OT, and short circuit

The ISL91302B dual/single output PMIC is available now in a 2.551 mm x 3.67 mm, 54-ball WLCSP package and is priced at $3.90 each/1,000. The ISL91301A triple-output PMIC and ISL91301B quad-output PMIC are available now in 2.551 mm x 2.87 mm, 42-ball WLCSP packages, both priced at $3.12 each/1,000.


Haven’t had enough? Then you should peruse the ISL91302B, ISL91301A, and ISL91301B datashee


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