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XRP7708 Datasheet(PDF) 6 Page - Exar Corporation

Part # XRP7708
Description  Quad Channel Digital PWM Step Down Controller
Download  27 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP7708 Datasheet(HTML) 6 Page - Exar Corporation

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© 2010 Exar Corporation
6/27
Rev. 1.0.3
PIN ASSIGNMENT
Fig. 3: XRP7708 Pin Assignment
PIN DESCRIPTION
Name
Pin Number
Description
VIN1
39
Power source for the internal linear regulators to generate VCCA, VDD and the Standby
LDO (LDOOUT). Place a decoupling capacitor close to the controller IC. Also used in
UVLO1 fault generation – if VIN1 falls below the user programmed limit, all channels
are shut down. The VIN1 pin needs to be tied to VIN2 on the board with a short trace.
VIN2
38
If the Vin2 pin voltage falls below the user programmed UVLO VIN2 level all channels
are shut down. The VIN2 pin needs to be tied to VIN1 on the board with a short trace.
VCCA
37
Output of the internal 5V LDO. This voltage is internally used to power analog blocks.
Note that a compensation capacitor should be used on this pin (see application note).
VCCD
26
Gate Drive input voltage. This is not an output voltage. This pin can be connected to
VCCA to provide power for the Gate Drive. VCCD should be connected to VCCA with the
shortest possible trace and decouple with a minimum 1µF capacitor. Alternatively,
VCCD could be connected to an external supply (not greater than 5V).
PGND1- PGND4
36,31,16,21
Power Ground. Ground connection for the low side gate driver.
AVDD
1
Output of the internal 1.8V LDO. A decoupling capacitor should be placed between
AVDD and AGND close to the chip (with short traces).
 


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