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Número de pieza | XRP7725 | |
Descripción | Intel Node Manager Compatible Programmable Power Management System | |
Fabricantes | Exar | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de XRP7725 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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 |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet XRP7725.PDF ] |
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