Exar Power Managementarchive.ednchina.com/image.ednchina.com/Inno_EXAR.pdf · EXAR CONFIDENTIAL POWER MANAGEMENT Independent channel frequency • Programmable independent switching

Powering ConnectivityJustin Chen 陈历忠

FAE leader and Application engineering supervisor, Asia.

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EXAR CONFIDENTIAL POWER MANAGEMENT

Datacom & Storage

Exar Product Lines: Powering connectivity

Data Encryption & Compression SolutionsData Deduplication Solutions10 Gigabit Ethernet NIC Solutions

Data Encryption & Compression SolutionsData Encryption & Compression SolutionsData Deduplication SolutionsData Deduplication Solutions10 Gigabit Ethernet NIC Solutions10 Gigabit Ethernet NIC Solutions

Communications

Carrier Ethernet and Optical Transport (OTN)SONET / SDH SolutionsT / E Telecom Carrier Solutions

Carrier Ethernet and Optical Transport (OTN)Carrier Ethernet and Optical Transport (OTN)SONET / SDH SolutionsSONET / SDH SolutionsT / E Telecom Carrier SolutionsT / E Telecom Carrier Solutions

Power

PowerXR

Standard LinearDC/DC Conversion

PowerPowerXRXR

Standard LinearStandard LinearDC/DC ConversionDC/DC Conversion

Interface

UART and Bridge SolutionsSerial Transceiver SolutionsUART and Bridge SolutionsUART and Bridge SolutionsSerial Transceiver SolutionsSerial Transceiver Solutions

Acquisitions:

Acquisitions:

Acquisitions:

Acquisitions:

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Interface Product Portfolio

UART Transceivers

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What is a UART?

• Universal Asynchronous Receiver/Transmitter

• Simple and high reliable communication protocol

• A bridge between serial data and CPU/MCU.

MCU/CPU Transceiver or other

serial interface device

EXAR UART

8-bit / VLIOI2C/SPI/USB

PCI/PCIeSerial DataModem I/Os

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UART Application Example

CPU/MCU Digital IOUARTData bus

1.8V

Serial Data

2.8V

Level-Shift

Exar solution

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XR16M890 is voted as the Best!

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XR16M890 Block Diagram

16 GPIOs

UART

8-bit/VLIO Interface

1.62V-3.63V I/O Buffers

CrystalOscillator /

Buffer

128-

byte

TX F

IFO

128-

byte

RX

FIFO

FBRG

Vcc_BusVcc_GPIO

Vcc_CoreVcc_UART

XTAL1XTAL2

GPIO[4:15]:

RTS#CTS#GPIO0/DTR#GPIO1/DSR#GPIO2/CD#GPIO3/RI#

RXTX

8-bit/VLIO

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Features, Advantages & Benefits

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Leading product-Exar Digital Power

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Digital power or Analog: digital camera or film camera?

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PowerXR Technology

Internal DAC50mV / step (lsb)

Digital value of error fed to digital compensator

Gain factor dependant on Vout

A simplification: The DPWM takes the control word from the compensator and generates the signals for GH and GL, for each phase.

PID Calculation: using the programmed constants from the PID registers, computes weighted

sum of the:

• Proportional value - the reaction to the present error

• Integral value - the reaction based on the sum of recent errors

• Derivative value - the reaction based on the rate-of-change of the error

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First generation PowerXR

Vout 1

Vout 2

Vout 3

Vout 4

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Vin (4.75 – 25V) Vin1               Vin2

4 ChannelDigital PWMControlEngine 

StdBy LDO3.3V / 5.0V @ 100mA max

I²CSDA / SCL to Host µC

GPIO4/6 GPIO 

EnableGeneral IC SHDN

ConfigurationRegisterset 

OTPMemory

Internal LDOs

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Typical schematic

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The second generation PowerXR-XRP7724

• World’s First Digital PWM Controller

• Four-Channel IC Offers Industry’s Most Advanced Feature Set, Lowest Power Consumption, and Highest Flexibility

• Expanded Voltage and Current Ranges

• Increased Accuracy

• SMBus Compliant I2C Interface

• Improved transient response by using over sample scheme.

Efficiency Curve12Vin, 5Vout

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Independent channel frequency

• Programmable independent switching frequency with factor X1, X2, X4.

• Optimize the efficiency and components size.

• Examples of frequency settings below:

Channel Example 1 Example 2

CH1 300K 300K

CH2 300K 600K

CH3 300K 1.2M

CH4 300K 300K

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EXAR CONFIDENTIAL POWER MANAGEMENT

Vout 1

Vout 2

Vout 3

Vout 4

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Gate DriversCurrent SensingHS Charge PumpVout Feedback

Vin (4.75 – 25V) 

4 ChannelDigital PWM & PFM

ControlEngine 

StandBy LDO3.3V  @ 50mA max

I²CSDA / SCL to Host µC

GPIO2 GPIOs 

EnableGeneral IC ENABLE

ConfigurationRegisterset 

FlashMemory

Internal LDOs

XRP7724 Block Diagram

Vout (0.6 – 5.1V) 

PSIO3 PSIOs 

Microprocessor,ROM, & RAM

5V  @ 50mA max

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XRP7724 typical application

•

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PowerXR Selector GuideExar P/N Vin Range Vout Range Gate Drive

Pull Up / Down I/Q Package type

Temperature Range

XRP7704 6.5V – 20V 0.9V – 5.1V - / - 9mA TQFN40 -40C to 125C

XRP7708 6.5V – 20V 0.9V – 5.1V 5ohm / 1.8ohm 9mA TQFN40 -40C to 125C

XRP7740 6.5V – 20V 0.9V – 5.1V 3ohm / 1.8ohm 9mA TQFN40 -40C to 125C

XRP7714 4.75V – 25V 0.9V – 5.1V 6ohm / 3ohm 9mA TQFN40 -40C to 125C

XRP7713 4.75V – 25V 0.9V – 5.1V 6ohm / 3ohm 9mA TQFN32 -40C to 125C

XRP7724 4.75V – 25V 0.6V – 5.1V 4ohm / 2ohm 2mA TQFN44 -40C to 125C

Thanks!