PDF XRP7725 Data sheet ( Hoja de datos )

Número de pieza	XRP7725
Descripción	Intel Node Manager Compatible Programmable Power Management System
Fabricantes	Exar
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No Preview Available ! XRP7725 Intel Node Manager Compatible Programmable Power Management System January 2014 Rev. 1.0.0 GENERAL DESCRIPTION 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. 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. 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. 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. FEATURES • Quad Channel Step-down Controller − Digital PWM 105kHz-1.23MHz Operation − Individual Channel Frequency Selection − Patented digital PFM with Ultrasonic mode − Patented Over Sampling Feedback • Instantaneous current monitoring – Intel® Node Manager Compatible • 4.75V to 25V Input Voltage − 4.75V-5.5V and 5.5V-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 • Supported by PowerArchitect™ 5 APPLICATIONS • Blade Servers • Micro Servers • Network Adapter Cards • Base Stations • Switches/Routers • Broadcast Equipment • Industrial Control Systems • Automatic Test Equipment TYPICAL APPLICATION DIAGRAM XRP7725 Figure 1: XRP7725 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 XRP7725 Intel Node Manager Compatible Programmable Power Management System CURRENT AND AUX ADC (MONITORING ADCS) Parameter Current Sense Accuracy Current Sense ADC INL DNL Current Limit Set Point Resolution and Current Sense ADC Resolution Current Sense ADC Range VOUT ADC Resolution VOUT ADC Accuracy VCC ADC Range UVLO WARN SET UVLO WARN CLEAR UVLO FAULT SET (Note 3) VCC ADC Resolution VCC ADC Accuracy Die Temp ADC Resolution Die Temp ADC Range Min. -3.75 -10 -5 -12.5 -120 -280 -1 4.6 4.4 4.4 4.2 -1 -44 Typ. ±1.25 ±2.5 ±0.4 0.27 1.25 2.5 15 30 60 200 5 Max. 3.75 10 5 +12.5 20 40 1 25 4.72 4.72 4.55 1 156 Units mV mV mV mV LSB mV mV mV mV LSB V V V V mV LSB °C °C Conditions Low Range (≤120mV) • -60mV applied High Range (≤280mV) • -150mV Low Range (≤120mV) High Range (≤280mV) Low Range (≤120mV) High Range (≤280mV) Low Range Mid Range High Range Note 2 UVLO WARN set point 4.6V, VCC =LDO5 UVLO WARN set point 4.6V, VCC =LDO5 UVLO FAULT set point 4.4V, VCC =LDO5 Vin <= 20V Output value is in Kelvin Note 2: Although Range of VCC ADC is 0V to 25V, operation below 4.55 is not supported. Note 3: This test ensures an UVLO FAULT flag will be given before the LDO5 hardware UVLO trips. LINEAR REGULATORS Parameter LDO5 Output Voltage Min. 4.85 Typ. 5.0 Max. 5.15 Units V Conditions 5.5V ≤ VCC ≤ 25V • 0mA < ILDO5OUT < 130mA, LDO3_3 Off LDO5 Current Limit 135 155 180 mA • LDO5 Fault Set LDO5 UVLO 4.74 V • VCC Rising LDO5 PGOOD Hysteresis 375 mV VCC Falling LDO5 Bypass Switch Resistance 1.1 1.5 Ω Bypass Switch Activation Threshold 2.5 2.5 % • V5EXT Rising, % of threshold setting Bypass Switch Activation Hysteresis 150 mV V5EXT Falling LDO3_3 Output Voltage LDO3_3 Current Limit 3.15 3.3 3.45 V • 4.6V ≤ LDO5 ≤ 5.5V 0mA < ILDO3_3OUT < 50mA 53 85 mA • LDO3_3 Fault Set Maximum total LDO loading during ENABLE start-up 30 mA ENABLE transition from logic low to high. Once LDO5 in regulation above limits apply. © 2014 Exar Corporation 5/34 Rev. 1.0.0 5 Page 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. See XRP7725EVB-DEMO-1 Manual. Figure 5: PFM to PWM Transition Figure 1: PWM to PFM Transition Figure 2: 0-6A Transient 300kHz PWM only Figure 3: 0-6A Transient 300kHz with OVS ±5.5% Figure 4: Sequential Start-up © 2014 Exar Corporation 11/34 Figure 5: Sequential Shut Down Rev. 1.0.0 11 Page

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