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XRP7708ILB-F Datasheet(PDF) 7 Page - Exar Corporation

Part # XRP7708ILB-F
Description  Quad Channel Digital PWM Step Down Controller
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP7708ILB-F Datasheet(HTML) 7 Page - Exar Corporation

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© 2010 Exar Corporation
7/27
Rev. 1.0.3
Name
Pin Number
Description
DVDD
2
Input for powering the internal digital logic. This pin should be connected to AVDD.
DGND
10
Digital Ground. This pin should be connected to the ground plane at the exposed pad
with a separate trace.
AGND
11
Analog Ground. This pin should be connected to the ground plane at the exposed pad
with a separate trace
GL1-GL4
17,22,30,55
Output pin of the low side gate driver. Connect directly to the respective gate of an
external N-channel MOSFET.
GH1-GH4
19,24,28,33
Output pin of the high side gate driver. Connect directly to the respective gate of an
external N-channel MOSFET.
LX1-LX4
34,29,23,18
Lower supply rail for the high-side gate driver (GHx). 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
32,27,20,25
High side driver supply pin(s). Connect BST to an external boost diode and a capacitor
as shown in the front page diagram.
The high side driver is connected between the BST pin and LX pin.
GPIO0-GPIO3
3,4,5,6
These pins can be configured as inputs or outputs to implement custom flags, power
good signals and enable/disable controls. A GPIO pin can also be programmed as an
input clock synchronizing IC to external clock. Refer to the “GPIO Pins” Section and the
“External Clock Synchronization” Section for more information.
GPIO4_SDA,
GPIO5_SCL
7,8
I2C serial interface communication pins. These pins can be re-programmed to perform
GPIO functions in applications when I2C bus is not used.
VOUT1-VOUT4
12,13,14,15
Voltage sense.
Connect to the output of the corresponding power stage.
LDOOUT
40
Output of the Standby LDO. It can be configured as a 5V or 3.3V output. A
compensation capacitor should be used on this pin [see Application Note].
ENABLE
9
If ENABLE is pulled high, the chip powers up (logic reset, registers configuration loaded,
etc.). If pulled low for longer than 100us, the XRP7708 is placed into shutdown.
AGND
Exposed Pad
Analog Ground.
Connect to analog ground (as noted above for pin 11).
ORDERING INFORMATION
Part Number
Temperature Range
Marking
Package
Packing Quantity
Note 1
Note 2
XRP7708ILB- F
-40°C≤TJ≤+125°C
XRP7708ILB
YYWW X
40-pin TQFN
Bulk
Halogen Free
XRP7708ILBTR-F
-40°C≤TJ≤+125°C
XRP7708ILB
YYWW X
40-pin TQFN
3K/Tape & Reel
Halogen Free
XRP7708EVB
XRP7708 Evaluation Board
“YY” = Year – “WW” = Work Week – “X” = Lot Number


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