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Digital multiphase PWM controllers with AVSBus; current control to 450A

Digital multiphase PWM controllers with AVSBus; current control to 450A

New Products |
By Graham Prophet



Intersil has added 12 digital multiphase controllers and a companion smart power stage, including the first digital solution with an Adaptive Voltage Scaling Bus (AVSBus). These digital controllers provide up to seven phases assignable in any combination across two outputs, and combine with smart power stages to provide a scalable solution from 10A to 450A. The result is enhanced power optimization and more energy-efficient networking and communications infrastructure equipment.

 

AVSBus joins the PMBus v1.3 specification and features a 50 MHz high-speed bus that connects directly to the processor to communicate telemetry data and deliver efficiency savings through adaptive voltage positioning. Intersil’s DC/DC controllers and ISL99227 60A smart power stage support demanding CPU core voltages, memory, and auxiliary power rails, enabling power designers to customize their solution to meet any rail requirements. Watch a video on this digital multiphase power solution here;

 

The digital multiphase family comprises three groups of controllers. The ISL68137 and ISL68134 controllers utilize the AVSBus to power and communicate with ARM-based processors in network routers, switches, servers, storage, and wireless telecom equipment. Two general-purpose controllers (ISL68127 and ISL68124) power network processors, FPGAs, SoCs and graphics accelerators. And eight controllers (ISL69147/44, ISL69137/34, ISL69128/27 and ISL69125/24) add a secondary high-speed interface (SVID or SVI2) to power the latest Intel and AMD processors in cloud computing applications.

 

The ISL681xx and ISL691xx controllers integrate a high performance digital engine featuring a synthetic current control architecture that tracks each phase current with zero latency. This allows the device to respond to any load transient with precise current and voltage positioning, and 30% less capacitance than competitive devices. Synthetic current control also makes it possible to develop high reliability systems using all-ceramic capacitors.

 

Engineers are able to realize the flexibility and benefit of digital control through Intersil’s PowerNavigator GUI software tool. PowerNavigator connects to development boards communicating across PMBus and AVSBus, allowing engineers to set up and control all parameters, optimize efficiency via precise current thresholds for adding/dropping phases, and adjust the loop tuning. PowerNavigator eliminates board rework as designs are completed with on-the-fly changes for stability tuning and optimization. The final configuration is saved to non-volatile memory.

 

Controller pricing in the table on the following pages; the ISL99227 smart power stage is supplied in a 5 x 5 mm, 32-lead QFN package and is priced at $5.21(1000). Development boards are also available

 

Intersil; www.intersil.com

 

next page; feature listing…


Key Features and Specifications of ISL681xx and ISL691xx Controllers

• PMBus 1.3 and AVSBus compliant

o Telemetry for Vin, Vout, input/output current, and temperature diagnostic fault reporting with black box capability

o ISL68137 and ISL68134 include AVSBus interface for adaptive voltage scaling

• Proprietary digital control scheme with patented synthetic current control

o Full bandwidth, zero latency current waveforms digitized per phase

o Fast transient response supporting minimal output capacitance, including all MLCC

• Flexible phase configuration

o Configurable PWMs, ability to assign phases to any output (X+Y)

o Allows solution to be scaled in current from 10A to 450A

• Power Stage Support

o Supports ISL99227 60A smart power stage with integrated current sensing

o Supports ISL6617A phase doubler for extending to 14 phase operation

 

• Intuitive setup, control and monitoring via PowerNavigator GUI

o Cycle by cycle current protection with average and peak thresholds

o Autonomous auto phase dropping (APD) with adjustable current thresholds

o Output and input over-voltage and under-voltage protection

 

Key Features and Specifications of ISL99227 60A Smart Power Stage

• Input voltage range of 4.5V to 18V

• 60A current capability with 25V rated synchronous FETs

• Integrated current sensing, 3% accuracy across line, load and temperature

 

• Differential current reporting at 5mV/A eliminating DCR error and noise

• 3.3V compatible tri-state PWM input

• Integrated temperature sensing with fault monitoring

• High side FET over-current protection

 

next page; package, price and phase configuration options…


 

Dual Output Device

Interface

Version

Output Phase

Configuration

Package

Price $USD

(1k units)

ISL68137

PMBus/AVSBus

X+Y= 7

6mm x 6mm, 48-L QFN

$5.30

ISL68134

PMBus/AVSBus

X+Y= 4

5mm x 5mm, 40-L TQFN

$4.10

ISL68127

PMBus

X+Y= 7

6mm x 6mm, 48-L QFN

$4.98

ISL68124

PMBus

X+Y= 4

5mm x 5mm, 40-L TQFN

$3.85

ISL69147

AMD SVI2

X+Y= 7

6mm x 6mm, 48-L QFN

$4.35

ISL69144

AMD SVI2

X+Y= 4

5mm x 5mm, 40-L TQFN

$2.78

ISL69137

IMVP8 SVID

X+Y= 7

6mm x 6mm, 48-L QFN

$3.24

ISL69134

IMVP8 SVID

X+Y= 4

5mm x 5mm, 40-L TQFN

$2.78

ISL69128

VR13/IMVP8

X+Y= 7

6mm x 6mm, 48-L QFN

$4.98

ISL69127

VR13 SVID

6+1 = 7

6mm x 6mm, 48-L QFN

$4.35

ISL69125

VR13 SVID

X+Y= 4

5mm x 5mm, 40-L TQFN

$3.55

ISL69124

VR13 SVID

X+Y= 4

5mm x 5mm, 40-L TQFN

$3.55

 

 

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