XRP7725ILBTR-F

Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System February 2019 Rev. 1.0.2 GENERAL DESCRIPTION FEATURES • Quad Channel Step-down Controller The XRP7725 is a quad channel Digital Pulse Width Modulated (DPWM) Step down (buck) controller. A wide 4.75V to 5.5V and 5.5V to 25V input voltage dual range allows for single supply operation from standard power rails. − Digital PWM 105kHz-1.23MHz Operation − Individual Channel Frequency Selection − Patented digital PFM with Ultrasonic mode − Patented Over Sampling Feedback With integrated FET gate drivers, two LDOs for standby power and a 105kHz to 1.23MHz independent channel to channel programmable constant operating frequency, the XRP7725 reduces overall component count and solution footprint and optimizes conversion efficiencies. A selectable digital Pulse Frequency Mode (DPFM) and low operating current result in better than 80% efficiency down to 10mA load provides support for portable and Energy Star compliant applications. Each XRP7725 output channel is individually programmable down to a minimum 0.6V with a resolution of 2.5mV, and configurable for precise soft start and soft stop sequencing, including delay and ramp control. • Instantaneous current monitoring – Intel® Node Manager Compatible • 4.75V to 25V Input Voltage − 4.75V to 5.5V and 5.5V to 25V Input Ranges − 0.6V to 5.5V Output Voltage • SMBus Compliant - I2C Interface − Full Power Monitoring and Reporting • 3 x 15V Capable PSIO + 2 x GPIOs • Full Start/Stop Sequencing Support • Built-in Thermal, Over-Current, UVLO and Output Over-Voltage Protections • On Board 5V and 3.3V Standby LDOs • On Board Non-volatile Memory The XRP7725 operation is fully controlled via an SMBus-compliant I2C interface allowing for advanced local and/or remote reconfiguration, full performance monitoring and reporting as well as fault handling. • Supported by PowerArchitect™ Design Tool Version 5 (PA5) APPLICATIONS Built-in independent output over voltage, over temperature, over-current and under voltage lockout protections insure safe operation under abnormal operating conditions. • • • • • • • • The XRP7725 is offered in a RoHS compliant, “green”/halogen free 44-pin TQFN package. TYPICAL APPLICATION DIAGRAM Blade Servers Micro Servers Network Adapter Cards Base Stations Switches/Routers Broadcast Equipment Industrial Control Systems Automatic Test Equipment XRP7725 Figure 1: XRP7725 Application Diagram 1/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System FEATURES AND BENEFITS System Integration Capabilities Programmable Power Benefits • Single supply operation • Fully Configurable • I2C interface allows: − Output set point − Intel Node Manager Compatible as well as other Power Management systems − Feedback compensation − Modification or reading of internal registers that control or monitor: − Frequency set point − Under voltage lock out − Output Current − Input voltage measurement − Input and Output Voltage − Gate drive dead time − Soft-Start/Soft-Stop Time • Reduced Development Time − Power Good − Configurable and re-configurable for different Vout, Iout, Cout, and Inductor values − Part Temperature − Enable/Disable Outputs − Over Current − No need to change external passives for a new output specification. − Over Voltage − Temperature Faults • Higher integration and Reliability − Adjusting fault limits and disabling/enabling faults − Many external components used in the past can be eliminated thereby significantly improving reliability. − Packet Error Checking (PEC) on I2C communication PowerArchitect™ Design and Configuration Software (PA5) • 5 GPIO pins with a wide range of configurability − Wizard quickly generates a base design − Fault reporting (including UVLO Warn/Fault, OCP Warn/Fault, OVP, Temperature, Soft-Start in progress, Power Good, System Reset) − Calculates all configuration registers − Projects can be saved and/or recalled − GPIOs can be configured easily and intuitively − Allows a Logic Level interface with other non-digital IC’s or as logic inputs to other devices − Dashboard interface can be used for realtime monitoring and debug • Frequency and Synchronization Capability System Benefits • Intel Node Manager Compatible current monitoring. − Selectable switching frequency between 105kHz and 1.2MHz • Ability to perform remote configuration updates. − Main oscillator clock and DPWM clock can be synchronized to external sources − ‘Master’, ‘Slave’ and ‘Stand-alone’ configurations are possible • Ability to analyze operating history, perform diagnostics and if required, take the supply off-line after making other system adjustments. • Internal MOSFET Drivers − Internal FET drivers (4Ω/2Ω) per channel − Built-In Automatic Dead-time adjustment − 30ns Rise and Fall times • 4 Independent SMPS channels and 2 LDOs in a 7x7mm TQFN 2/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltage Range VCC ............................... 5.5V to 25V Input Voltage Range VCC = LDO5 ................ 4.75V to 5.5V VOUT1, 2, 3, 4 ...................................................... 5.5V Junction Temperature Range ....................-40°C to 125°C JEDEC Thermal Resistance θJA ..........................30.2°C/W VCCD, LDO5, LDO3_3, GLx, VOUTx ............. -0.3V to 7.0V ENABLE, 5V_EXT ....................................... -0.3V to 7.0V GPIO0/1, SCL, SDA ............................................... 6.0V PSIOs Inputs, BFB .................................................. 18V DVDD, AVDD ........................................................ 2.0V VCC ....................................................................... 28V LX# ............................................................. -1V to 28V BSTx, GHx .................................................... VLXx + 6V Storage Temperature .............................. -65°C to 150°C Junction Temperature .......................................... 150°C Power Dissipation ................................ Internally Limited Lead Temperature (Soldering, 10 sec) ................... 300°C ESD Rating (HBM - Human Body Model) .................... 2kV ELECTRICAL SPECIFICATIONS Specifications with standard type are for an Operating Junction Temperature of TJ = 25°C only; limits applying over the full Operating Junction Temperature range are denoted by a “•”. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise indicated, VCC = 5.5V to 25V, 5V EXT open. QUIESCENT CURRENT Parameter Min. VCC Supply Current in SHUTDOWN ENABLE Turn On Threshold ENABLE Pin Leakage Current Typ. Max. Units 10 20 µA 0.95 V 10 uA EN=5V uA EN=0V 0.82 -10 Conditions EN = 0V, VCC = 12V VCC = 12V Enable Rising LDO3_3 disabled, all channels disabled VCC Supply Current in STANDBY 440 600 µA GPIOs programmed as inputs VCC =12V,EN = 5V VCC Supply Current 2ch PFM 3.1 mA 2 channels on and set at 5V, VOUT forced to 5.1V, no load, non-switching, Ultrasonic off, VCC =12 V, No I2C activity. VCC Supply Current 4ch PFM 4.0 mA 4 channels on and set at 5V, VOUT forced to 5.1V, no load, non-switching, Ultrasonic off, VCC =12V, No I2C activity. VCC Supply Current ON 18 mA All channels enabled, Fsw=600kHz, gate drivers unloaded, No I2C activity. 3/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System INPUT VOLTAGE RANGE AND UNDERVOLTAGE LOCKOUT Parameter VCC Range Min. Typ. Max. Units 5.5 25 V 4.75 5.5 V Conditions • • With VCC connected to LDO5 VOLTAGE FEEDBACK ACCURACY AND OUTPUT VOLTAGE SET POINT RESOLUTION Parameter VOUT Regulation Accuracy Low Output Range 0.6V to 1.6V PWM Operation VOUT Regulation Accuracy Mid Output Range 0.6V to 3.2V PWM Operation VOUT Regulation Accuracy High Output Range 0.6V to 5.5V PWM Operation VOUT Regulation Range Min. Typ. -5 -20 -7.5 -22.5 -15 -45 -20 -50 -30 -90 -40 -100 0.6 Max. Units 5 20 7.5 22.5 15 45 20 50 30 90 40 100 5.5 mV mV mV mV mV mV mV mV mV mV mV mV V Conditions • • • • • • • 0.6 ≤ VOUT ≤ 1.6V 0.6 ≤ VOUT ≤ 1.6V VCC =LDO5 0.6 ≤ VOUT ≤ 3.2V 0.6 ≤ VOUT ≤ 3.2V VCC =LDO5 0.6 ≤ VOUT ≤ 5.5V 0.6 ≤ VOUT ≤ 4.2V VCC =LDO5 Without external divider network 12.5 25 50 mV Low Range Mid Range High Range VOUT Fine Set Point Resolution1 2.5 5 10 mV Low Range Mid Range High Range VOUT Input Resistance 120 90 75 kΩ Low Range Mid Range High Range VOUT Input Resistance in PFM Operation 10 1 0.67 MΩ Low Range Mid Range High Range VOUT Native Set Point Resolution Power Good and OVP Set Point Range (from set point) -155 -310 -620 157.5 315 630 mV Low Range Mid Range High Range Power Good and OVP Set Point Accuracy -5 -10 -20 5 10 20 mV Low Range Mid Range High Range 16 V BFB Set Point Range 9 1 BFB Set Point Resolution BFB Accuracy -0.5 V 0.5 V Note 1: Fine Set Point Resolution not available in PFM 4/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System CURRENT AND AUX ADC (MONITORING ADCS) Parameter Current Sense Accuracy Min. Typ. Max. Units -3.75 -10 -5 -12.5 ±1.25 3.75 10 5 +12.5 mV mV mV mV LSB ±2.5 Conditions • Low Range (≤120mV) -60mV applied • High Range (≤280mV) -150mV Current Sense ADC INL ±0.4 DNL 0.27 Current Limit Set Point Resolution and Current Sense ADC Resolution 1.25 mV Low Range (≤120mV) 2.5 mV High Range (≤280mV) mV Low Range (≤120mV) Current Sense ADC Range -120 20 -280 40 15 30 60 VOUT ADC Resolution VOUT ADC Accuracy High Range (≤280mV) Low Range Mid Range High Range mV -1 1 LSB 4.6 25 V Note 2 UVLO WARN SET 4.4 4.72 V UVLO WARN set point 4.6V, VCC =LDO5 UVLO WARN CLEAR 4.4 4.72 V UVLO WARN set point 4.6V, VCC =LDO5 UVLO FAULT SET (Note 3) 4.2 4.55 V UVLO FAULT set point 4.4V, VCC =LDO5 VCC ADC Range VCC ADC Resolution VCC ADC Accuracy 200 1 -1 5 Die Temp ADC Resolution Die Temp ADC Range mV Vin 1uF) to PAD is recommended for each VCCD pin with the pin(s) connected to LDO5 with shortest possible etch. VCCD1-2 VCCD3-4 23,34 AGND 2 GL_RTN1-4 39,33, 28,22 GL1-GL4 38,32, 27,21 Output pin of the low side gate driver. Connect directly to the gate of an external Nchannel MOSFET. GH1-GH4 36,30, 25,19 Output pin of the high side gate driver. Connect directly to the gate of an external Nchannel MOSFET. Analog ground pin. This is the small signal ground connection. Ground connection for the low side gate driver. This should be routed as a signal trace with GL. Connect to the source of the low side MOSFET. 9/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System Name Pin Number Description 37,31, 26,20 Lower supply rail for the GH high-side gate driver. Connect this pin to the switching node at the junction between the two external power MOSFETs and the inductor. These pins are also used to measure voltage drop across bottom MOSFETs in order to provide output current information to the control engine. BST1-BST4 35,29, 24,18 High side driver supply pin(s). Connect BST to the external capacitor as shown in the Typical Application Circuit on page 2. The high side driver is connected between the BST pin and LX pin and delivers the BST pin voltage to the high side FET gate each cycle. GPI0-GPIO1 9,10 These pins can be configured as inputs or outputs to implement custom flags, power good signals, enable/disable controls and synchronization to an external clock. LX1-LX4 Open drain, these pins can be on and off, shedding the load configures as standard logic configured, but as open drains used to control external power MOSFETs to switch loads for fine grained power management. They can also be outputs or inputs just as any of the GPIOs can be require an external pull-up when configured as outputs. PSIO0-PSIO2 13,14,15 SDA, SCL 11,12 VOUT1-VOUT4 5,6,7,8 Connect to the output of the corresponding power stage. The output is sampled at least once every switching cycle. LDO5 44 Output of a 5V LDO. This is a micro power LDO that can remain active while the rest of the IC is in the stand-by mode. This LDO is also used to power the internal Analog Blocks. LDO3_3 1 Output of the 3.3V standby LDO. This is a micro power LDO that can remain active while the rest of the IC is in shutdown. ENABLE 40 If ENABLE is pulled high or allowed to float high, the chip is powered up (logic is reset, registers configuration loaded, etc.). The pin must be held low for the XRP7725 to be placed into shutdown. BFB 42 Input from the 15V output created by the external boost supply. When this pin goes below a pre-defined threshold, a pulse is created on the low side drive to charge this output back to the original level. If not used, this pin should be connected to GND. DGND 17 Digital ground pin. This is the logic ground connection, and should be connected to the ground plane close to the PAD. CPLL 3 V5EXT 43 AVDD 4 PAD 45 SMBus/I2C serial interface communication pins. Connect to a 2.2nF capacitor to GND. External 5V that can be provided. If one of the output channels is configured for 5V, then this voltage can be fed back to this pin for reduced operating current of the chip and improved efficiency. Output of the internal 1.8V LDO. AVDD and AGND close to the chip. A decoupling capacitor should be placed between This is the die attach paddle, which is exposed on the bottom of the part. externally to the ground plane. Connect ORDERING INFORMATION(1) Part Number XRP7725ILB-F XRP7725EVB-DEMO-2-KITA Operating Temperature Range Lead-Free Package Packing Method I2C Default Address 0x28 (7Bit) Yes(2) 44-pin TQFN Tray -40°C ≤ TJ ≤ +125°C Evaluation kit includes XRP7725EVB-DEMO-1 Evaluation Board with PowerArchitect™ Software and XRP77XXEVB-XCM (USB to I2C MaxLinear Configuration Module) XRP7725EVB-DEMO-2 XRP7725 Evaluation Board XR77XXEVB-XCM-V62 Configuration Module Notes: 1. Refer to www.exar.com/XRP7725 for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. 10/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System TYPICAL PERFORMANCE CHARACTERISTICS All data taken at VCC = 12V, TJ = TA = 25°C, unless otherwise specified - Schematic and BOM from XRP7725EVB. XRP7725EVB-DEMO-1 Manual. Figure 5: PFM to PWM Transition Figure 6: PWM to PFM Transition Figure 7: 0-6A Transient 300kHz PWM only Figure 8: 0-6A Transient 300kHz with OVS ±5.5% Figure 9: Sequential Start-up Figure 10: Sequential Shut Down 11/35 See Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System Example Figure 11: Simultaneous Start-up Figure 12: Simultaneous Shut Down Figure 13: PFM Zero Current Accuracy Figure 14: LDO5 Brown Out Recovery, No Load 1.00 0.95 0.90 Vcc Vin=25V Rising 0.85 Vcc Vin=25V Falling 0.80 0.75 Vcc Vin=4.75 V Rising 0.70 Vcc Vin=4.75 V Falling 0.65 0.60 -40°C 25°C 85°C 125°C Figure 15: Enable Threshold Over Temp 12/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System FUNCTIONAL OVERVIEW external circuitry. The 3.3V LDO is solely for customer use and is not used by the chip. There is also a 1.8V linear regulator which is for internal use only and should not be used externally. The XRP7725 is a quad-output digital pulse width modulation (DPWM) controller with integrated gate drivers for use with synchronous buck switching regulators. Each output voltage can be programmed from 0.6V to 5.5V without the need for an external voltage divider. The wide range of programmable DPWM switching frequency (from 105 kHz to 1.2 MHz) enables the user to optimize for efficiency or component sizes. Since the digital regulation loop requires no external passive components, loop performance is not compromised due to external component variation or operating condition. A key feature of the XRP7725 is its advinced power management capabilities. All four outputs are independently programmable and provide the user full control of the delay, ramp, and sequence during power up and power down. The user may also control how the outputs interact and power down in the event of a fault. This includes active ramp down of the output voltages to remove an output voltage as quickly as possible. Another useful feature is that the outputs can be defined and controlled as groups. The XRP7725 provides a number of critical safety features, such as Over-Current Protection (OCP), Over-Voltage Protection (OVP), Over Temperature Protection (OTP) plus input Under Voltage Lockout (UVLO). In addition, a number of key health monitoring features such as warning level flags for the safety functions, Power Goods (PGOOD), etc., plus full monitoring of system voltages and currents. The above are all programmable and/or readable from the SMBus and many are steerable to the GPIOs for hardware monitoring. The XRP7725 has two main types of programmable memory. The first type is runtime registers that contain configuration, control and monitoring information for the chip. The second type is rewritable NonVolatile Flash Memory (NVFM) that is used for permanent storage of the configuration data along with various chip internal functions. During power up, the run time registers are loaded from the NVFM allowing for standalone operation. The XRP7725 brings an extremely high level of functionality and performance to a programmable power system. Ever decreasing product budgets require the designer to quickly make good cost/performance tradeoffs to be truly successful. By incorporating four switching channels, two user LDOs, a charge pump boost controller, along with internal gate drivers, all in a single package, the XRP7725 allows for extremely cost effective power system designs. Another key cost factor that is often overlooked is the unanticipated Engineering Change Order (ECO). The programmable versatility of the XRP7725, along with the lack of hard wired configuration components, allows for minor and major changes to be made in circuit by simple reprogramming. For hardware communication, the XRP7725 has two logic level General Purpose InputOutput (GPIO) pins and three, 15V, open drain, Power System Input-Output (PSIO) pins. Two pins are dedicated to the SMBus data (SDA) and clock (SCL). Additional pins include Chip Enable (Enable), Aux Boost Feedback (BFB) and External PLL Capacitor (CPLL). In addition to providing four switching outputs, the XRP7725 also provides control for an Aux boost supply, and two stand-by linear regulators that produce 5V and 3.3V for a total of seven customer usable supplies in a single device. The 5V LDO is used for internal power and is also available for customer use to power 13/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System THEORY OF OPERATION CHIP ARCHITECTURE REGULATION LOOPS Vin (VCC) Vref DAC VFB (VOUTx) Scaler ÷1,2,4 AFE Error Amp AFE ADC Window Comp. Fine Adjust Vin Feed Forward Error Register PID Vdrive (VCCD)x DPWM Gate Driver GHx GLx LXx Current ADC OVS PFM/ Ultrasonic PWMPFM Sel Figure 16: XRP7725 Regulation Loops Figure 16 shows a simplified functional block diagram of the regulation loops for one output channel of the XRP7725. There are four separate parallel control loops; Pulse Width Modulation (PWM), Pulse Frequency Modulation (PFM), Ultrasonic, and Over Sampling (OVS). Each of these loops is fed by the Analog Front End (AFE) as shown at the left of the diagram. The AFE consist of an input voltage scaler, a programmable Voltage Reference (Vref) DAC, Error Amplifier, and a window comparator. Some of the functional blocks are common and shared by each channel by means of a multiplexer. 1. For output voltages from 1.6V to 3.2V (mid range) the scaler gain is 1/2 and for voltages greater than 3.2V (high range) the gain is 1/4. This results in the low range having an output voltage resolution of 12.5mV, the mid range having a resolution of 25mV and the high range having a resolution of 50mV. The error amp has a gain of 4 and compares the output voltage of the scaler to Vref to create an error voltage on its output. This is converted to a digital error term by the AFE ADC and is stored in the error register. The error register has a fine adjust function that can be used to improve the output voltage set point resolution by a factor of 5 resulting in a low range resolution of 2.5mV, a mid range resolution of 5mV and a high range resolution of 10mV. The output of the error register is then used by the Proportional Integral Derivative (PID) controller to manage the loop dynamics. PWM Loop The PWM loop operates in Voltage Control Mode (VCM) with optional VIN feed forward based on the voltage at the VCC pin. The reference voltage (Vref) for the error amp is generated by a 0.15V to 1.6V DAC that has 12.5mV resolution. In order to provide a 0.6V to 5.5V output voltage range, an input scaler is used to reduce feedback voltages for higher output voltages to bring them within the 0.15V to 1.6V control range. So for output voltages up to 1.6V (low range) the scaler has a gain of The XRP7725 PID is a 17-bit five-coefficient control engine that calculates the required duty cycle under the various operating conditions and feeds it to the Digital Pulse Width Modulator (DPWM). Besides the normal 14/35 Rev. 1.0.2 Not Recommended for New Designs (Suggested Alternate: XRP7714) XRP7725 Intel Node Manager Compatible Programmable Power Management System coefficients the PID also uses the VCC voltage to provide a feed forward function. # Cycles Reg Default = 20 The XRP7725 DPWM includes a special delay timing loop that provides a timing resolution that is 16 times the master oscillator frequency (103MHz) for a timing resolution of 607ps for both the driver pulse width and dead time delays. The DWPM produces the Gate High (GH) and Gate Low (GL) signals for the driver. The maximum and minimum on-times and dead time delays are programmable by configuration resisters. A CHx Fsw PFM Current Threshold Reg A Clk COUNTER Clear A