PDF XRP7714 Data sheet ( Hoja de datos )

Número de pieza	XRP7714
Descripción	Quad Channel Digital PWM Step Down Controller
Fabricantes	Exar
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No Preview Available ! March 2011 XRP7714 Quad Channel Digital PWM Step Down Controller Rev. 1.1.6 GENERAL DESCRIPTION The XRP7714 is a quad-output pulse-width modulated (PWM) step-down DC-DC controller with a built-in LDO for standby power and GPIOs. The device provides a complete power management solution in one IC and is fully programmable via an I2C serial interface. Independent Digital Pulse Width Modulator (DPWM) channels regulate output voltages and provide all required protection functions such as current limiting and over-voltage protection. Each output voltage can be programmed from 0.9V to 5.1V without the need of an external voltage divider. The wide range of the programmable DPWM switching frequency (from 300 KHz to 1.5 MHz) enables the user to optimize between efficiency and component size. Input voltage range is from 4.75V to 25V. An I2C bus interface is provided to program the IC as well as to communicate with the host for fault reporting and handling, power rail parameters monitoring, etc. The device offers a complete solution including independently programmable: soft-start, soft- stop, start-up delay and ramp of each PWM regulator. APPLICATIONS • Multi Channel Power Supplies • Audio-Video Equipments • Industrial & Telecom Equipments • Processors & DSPs Based Equipments FEATURES • 4 Channel Step Down Controller − Programmable Output Voltage 0.9V-5.1V − Programmable 1.5MHz DPWM Frequency − Integrated FET Drivers • 4.75V to 5.5V and 5.5V to 25V Input Voltage Range • Up to 6 Reconfigurable GPIO Pins • Fully Programmable via I2C Interface • Independent Digital Pulse Width Modulator (DPWM) channels • Complete Monitoring and Reporting • Complete Power Up/Down Sequencing • Full On Board Protection OTP, UVLO, OCP and OVP • Built-in 3.3V/5V LDO • PowerArchitect™ Design Software • Green/Halogen Free 40-pin TQFN TYPICAL APPLICATION DIAGRAM VIN: 4.75 TO 25V Vout1 LX1 LDO OUT C8 GPIO0 GPIO1 GPIO2 GPIO3 SDA I2C SCL ENABLE VCCA Vin C3 GL1 GH1 C5 1 AVDD 2 DVDD 3 GPIO0 4 GPIO1 5 GPIO2 6 GPIO3 7 GPIO4_SDA 8 GPIO5_SCL 9 ENABLE 10 DGND U1 XRP7714 Exposed Pad: DGND GL2 LX2 GH2 BST2 VCCD BST4 GH4 LX4 GL4 PGND4 30 29 28 27 26 25 24 23 22 21 Vout4 Vout3 Vout2 GL3 GH3 C4 D1 GL2 C1 GH1 Q1 GL1 LX1 VCCD Vin C6 LX2 GH2 Q3 GL2 GH2 C9 D2 C10 D3 LX2 R1 GH4 C11 ENABLE LX4 VCCD VCCA Vin LX4 R2 C14 Q5 GH4 C12 GL4 GL4 D4 C17 VCCD LX3 Vin C15 LX3 GH3 Q7 GL3 L1 Q2 Vout2 L2 Q4 Vout4 L3 Q6 Vout3 L4 Q8 Vout1 VOUT1 C2 VOUT2 C7 VOUT4 C13 VOUT3 C16 Fig. 1: XRP7714 Application Diagram Exar Corporation 48720 Kato Road, Fremont CA 94538, USA www.exar.com Tel. +1 510 668-7000 – Fax. +1 510 668-7001 1 page BLOCK DIAGRAM VOUT1 PreScaler Vtar DAC XRP7714 Quad Channel Digital PWM Step Down Controller Feedback ADC1/2 Channel 1 Digital PID Hybrid DPWM SS & PD Isense1 Delay Gate Driver BST1 GH1 LX1 GL1 PGND1 VOUT2 PreScaler Vtar DAC Feedback ADC1/2 Channel 2 – Digital PID Hybrid DPWM SS & PD Isense2 6 Dead Time Gate Driver BST2 GH2 LX2 GL2 PGND2 VOUT3 VOUT4 VCC VDD GPIO 0-3 SDA,SCL LDO GPIO I2C Channel 3 VCCD Channel 4 VREF OSC OTP Fault Handling CLOCK PWR Good Current ADC1/2 UVLO Configuration Registers 11-CH MUX Isense1 Isense2 Isense3 Isense4 Vout1 Vout2 Vout3 Vout4 Vtj VIN2 VIN1 STBY LR LDOOUT Fig. 2: XRP7714 Block Diagram © 2011 Exar Corporation 5/29 Rev. 1.1.6 5 Page XRP7714 Quad Channel Digital PWM Step Down Controller FEATURES AND BENEFITS General DPWM Benefits: • Eliminate temperature and time variations associated with passive components in: − Output set point − Feedback compensation − Frequency set point − Under voltage lock out − Input voltage measurement − Gate drive dead time • Tighter parameter tolerances including operating frequency set point • Easy configuration and re-configuration for different Vout, Iout, Cout, and Inductor selection by simply changing internal PID coefficients. No need to change external passives for a new output specification. • Higher integration: Many external circuits can be handled by monitoring or modifying internal registers • Selectable DPWM frequency and Controller Clock Frequency Other Benefits: • A single voltage is needed for regulation [no External LDO required]. • I2C interface allows: − Communication with a System Controller or other Power Management devices for optimized system function − Access to modify or read internal registers that control or monitor: − Output Current − Input and Output Voltage − Soft-Start/Soft-Stop Time − ‘Power Good’ − Part Temperature − Enable/Disable Outputs − Over Current − Over Voltage − Temperature Faults − Adjusting fault limits and disabling/enabling faults − Packet Error Checking (PEC) on I2C communication • 6 Configurable GPIO pins, (4 if I2C is in use). Pins can be configured in several ways: − Fault reporting (including OCP, OVP, Temperature, Soft-Start in progress, Power Good) − Allows a Logic Level interface with other non-digital IC’s or as logic inputs to other devices − Possible to configure as traditional ‘enable’ pin for all 4 outputs − 2 GPIOs can be dedicated to the I2C Interface as required by the customers design • Frequency and Synchronization Capability − Selectable switching frequency between 300kHz and 1.5MHz − Channel to channel phase relationship is a fixed 90 degrees − Main oscillator clock and DPWM clock can be synchronized to external sources − ‘Master’, ‘Slave’ and ‘Stand-alone’ Configurations are possible • Internal MOSFET Drivers − Internal FET drivers (3Ω/6Ω) for each Channel − Built-In Automatic Dead-time adjustment − 30ns Rise and Fall times • PowerArchitect™ Design and Configuration Software: − In its simplest form only VIN, VOUT, and Iout for each channel is required. − The software calculates configuration register content based upon customer requirements. PID coefficients for correct loop response (for automatic or customized designs) can be generated and sent to the device. − Configurations can be saved and/or recalled − GPIOs can be configured easily and intuitively − Synchronization configuration can be adjusted − Interface can be used for real-time debugging and optimization • Customizing XRP7714 with customer parameters − Once a configuration is finalized it can be sent to EXAR and can reside in pre-programmed parts that customers can order with an individual part number. − Allows parts to be used without I2C interface System Benefits: • Reliability is enhanced via communication with the system controller which can obtain real time data on an output voltage, input voltage and current. • System processors can communicate with the XRP7714 directly to obtain data or make adjustments to react to circuit conditions • A system process or could also be configured to log and analyze operating history, perform diagnostics and if required, take the supply off-line after making other system adjustments. • If customer field service is a possibility for your end product, parameter reporting and history would provide additional capabilities for troubleshooting or aid in future system upgrades. © 2011 Exar Corporation 11/29 Rev. 1.1.6 11 Page

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