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PDF XRP7724 Data sheet ( Hoja de datos )
| Número de pieza | XRP7724 | |
| Descripción | Quad Channel Digital PWM/PFM Programmable Power Management System | |
| Fabricantes | Exar | |
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October 2012
XRP7724
Quad Channel Digital PWM/PFM
Programmable Power Management System
Rev. 1.0.1
GENERAL DESCRIPTION
The XRP7724 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 XRP7724
reduces overall component count and solution
footprint and optimizes conversion efficiencies.
A selectable digital Pulse Frequency Mode
(DPFM) capable of better than 80% efficiency
at light current load and low operating current
allow for portable and Energy Star compliant
applications. Each XRP7724 output channel is
individually programmable as low as 0.6V with
a resolution as fine as 2.5mV, and
configurable for precise soft start and soft stop
sequencing, including delay and ramp control.
The XRP7724 operations are fully controlled
via a 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 XRP7724 is offered in a RoHS compliant,
“green”/halogen free 44-pin TQFN package.
APPLICATIONS
Servers
Base Stations
Switches/Routers
Broadcast Equipment
Industrial Control Systems
Automatic Test Equipment
Video Surveillance Systems
FEATURES
Quad Channel Step-down Controller
Digital PWM 105kHz-1.23MHz Operations
Individual Channel Frequency Selection
Patented digital PFM with Ultrasonic mode
Patented Over Sampling Feedback
Integrated MOSFET Drivers
Programmable 5 coefficient PID control
4.75V to 25V Input Voltage
4.75V-5.5 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™
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7724 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  
XRP7724
Quad Channel Digital PWM/PFM
Programmable Power Management System
PWM GENERATORS AND OSCILLATOR
Parameter
Switching Frequency (fsw)
Range
fsw Accuracy
CLOCK IN
Synchronization Frequency
CLOCK IN
Synchronization Frequency
Min.
105
–5
20
10
Typ.
25.7
12.8
Max.
1230
5
31
15.5
Units
kHz
%
MHz
MHz
GPIOS5
Parameter
Input Pin Low Level
Input Pin High Level
Input Pin Leakage Current
Output Pin Low Level
Output Pin High Level
Output Pin High Level
Output Pin High-Z leakage
Current (GPIO pins only)
Maximum Sink Current
I/O Frequency
Min.
2.0
Typ.
2.4
3.3
Note 5: 3.3V CMOS logic compatible, 5V tolerant.
Max.
0.8
1
0.4
3.6
10
1
30
Units
V
V
µA
V
V
V
µA
mA
MHz
PSIOS6
Parameter
Input Pin Low Level
Input Pin High Level
Input Pin Leakage Current
Output Pin Low Level
Min.
2.0
Typ.
Max.
0.8
1
0.4
Units
V
V
µA
V
Output Pin High Level
15 V
Output Pin High-Z leakage
Current (PSIO pins only)
I/O Frequency
10 µA
5 MHz
Note 6: 3.3V/5.0V CMOS logic compatible, maximum rating of 15.0V
Conditions
Steps defined in table
When synchronizing to an external clock
(Range 1)
When synchronizing to an external clock
(Range 2)
Conditions
ISINK = 1mA
ISOURCE = 1mA
ISOURCE = 0mA
Open Drain Mode
Conditions
ISINK = 3mA
Open Drain. External pull-up resistor to
user supply
© 2012 Exar Corporation
5/29
Rev. 1.0.1
5 Page 
Example
XRP7724
Quad Channel Digital PWM/PFM
Programmable Power Management System
Fig. 11: Simultaneous Start-up
Fig. 12 Simultaneous Shut Down
Fig. 13: PFM Zero Current Accuracy
1.00
0.95
0.90
0.85
Vin=25V
Rising
0.80
0.75
0.70
Vin=25V
Falling
Vin=4.75
V Rising
0.65
0.60
-40°C
25°C
85°C
125°C
Vin=4.75
V Falling
Fig. 15: Enable Threshold Over Temp
Fig. 14: LDO5 Brown Out Recovery, No Load
© 2012 Exar Corporation
11/29
Rev. 1.0.1
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet XRP7724.PDF ] | |
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