Multiphase PMICs have high efficiency and small footprint

25th April 2018
Source: Renesas
Posted By : Anna Flockett
Multiphase PMICs have high efficiency and small footprint

Renesas Electronics has announced three programmable power management ICs (PMICs) that offer the highest power efficiency and smallest footprint for application processors in smartphones and tablets: the ISL91302B, ISL91301A, and ISL91301B PMICs. The PMICs also deliver power to artificial intelligence (AI) processors, FPGAs, and industrial microprocessors (MPUs), and they are suitable for powering the 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 94percent peak efficiency in a 70mm2 solution size that is more than 40% smaller than competitive PMICs.

In addition to the ISL91302B, Renesas’ ISL91301A triple output PMIC and ISL91301B quad output PMIC both deliver up to 16A of output power with 94% peak efficiency. The new programmable PMICs leverage Renesas’ R5 Modulation Technology to provide fast single-cycle transient response, digitally tuned compensation, and ultra-high 6MHz (max) switching frequency during load transients. These features make it easier for power supply designers to design boards with 2x2mm, 1mm low profile inductors, small capacitors, and only a few passive components.

Renesas PMICs also do not require external compensation components or external dividers to set operating conditions. Each PMIC dynamically changes the number of active phases for optimum efficiency at all output currents. Their low quiescent current, superior light load efficiency, regulation accuracy, and fast dynamic response significantly extend battery life for today’s feature-rich, power hungry devices.

“Smartphone and tablet application processors require smaller footprint power supplies and higher output current and efficiency to maximize battery life,” said Mark Downing, Vice President, Core Power Solutions Division, Renesas Electronics Corporation. “The ISL91302B and ISL91301A/B PMICs offer designers everything they need to solve their toughest PCB layout challenges, dynamically scale performance, and extend battery run-time. 

Key Features of ISL91302B PMIC

  • Available in three factory configurable options for one or two output rails:
  • Dual-phase (2 + 2) configuration supporting 10A from each output
  • Triple-phase (3 + 1) configuration supporting 15A from one output and 5A from the second output
  • Quad-phase (4 + 0) configuration supporting 20A from one output
  • Small solution size: 7x10mm for 4-phase design
  • Input supply voltage range of 2.5 to 5.5V
  • I2C or SPI programmable Vout from 0.3 to 2V
  • R5 modulator architecture balances current loads with smooth phase adding and dropping for power efficiency optimisation
  • Provides 75μA quiescent current in discontinuous current mode (DCM)
  • Independent dynamic voltage scaling for each output
  • ±0.7% system accuracy for -10 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

Key Features of ISL91301A and ISL91301B PMICs

  • Available in two factory configurable options:
  • ISL91301A: dual-phase, three output rails configured as 2+1+1 phase
  • ISL91301B: single-phase, four output rails configured as 1+1+1+1 phase
  • 4A per phase for 2.8-5.5V supply voltage
  • 3A per phase for 2.5-5.5V supply voltage
  • Small solution size: 7x10mm for 4-phase design
  • I2C or SPI programmable Vout from 0.3-2V
  • Provides 62μA quiescent current in DCM mode
  • Independent dynamic voltage scaling for each output
  • ±0.7% system accuracy for -10 to 85°C with remote voltage sensing
  • Soft-start and fault protection against UV, OV, OC, OT, and short circuit

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