XRP6142 Datasheet, PDF (4/17 Pages) Exar Corporation – Synchronous Step-Down Controller with DDR

PIN ASSIGNMENT
XRP6142
Synchronous Step-Down Controller with DDR
Memory Termination
Figure. 3: XRP6142 Pin Assignment
PIN DESCRIPTION
Name
AGND
VTTREF
VDDQ/2
V_REF
REFIN
FB
CSGND
ILIM
PGND
GL
SW
GH
BST
V_IN
Vcc
EN
Thermal pad
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
-
Description
Analog Ground
Buffered output of VDDQ/2
V_TT reference voltage for DDR applications.
Buffer input voltage.
Voltage used for the input to the V_TTREF buffer
Precision reference output
Reference input to the switching-regulator feedback comparator
Feedback input to feedback comparator
Current-sense ground
Connect a resistor between this pin and the low-side current-sense element in order to
set the current-limit-trip threshold. See applications section for instructions on how to
set this resistor
Gate driver GND.
Low-side N-channel MOSFET driver
Switch node for floating-high-side gate drive
High-side N-channel MOSFET driver
Bootstrap capacitor to drive the high-side gate driver, GH
Input voltage for the power train
Input voltage for the XRP6142 internal circuitry and gate drives. V_IN and V_CC can be tied
together when V_IN ≥ 3.0V
Precision enable pin. Pulling this pin above 1.2V will turn the part on
Internally connected to AGND
© 2010 Exar Corporation
Page 4 of 17
Rev. 1.0.0