XRP6142EL2-0-F Datasheet, PDF (13/17 Pages) Exar Corporation – Synchronous Step-Down Controller with DDR Memory Termination

XRP6142
Synchronous Step-Down Controller with DDR
Memory Termination
DESIGN EXAMPLES
5V STEP-DOWN CONVERTER
Note: The data shown in figures 6 trough 15 was collected using this circuit.
RVCC
10 Ohm
CVCC
4.7uF
CVCC1
0.1uF
C4
0.1uF
CBST
0.1uF
T. PAD
1 _{AGND XRP6142EL2.0-FGH} 12
2
11
VTTREF _U1
SW
3 _VDDQ/2
GL ¹⁰
4
VREF
9
PGND
RLIM 2.2k
CFF
1nF
R1
39.2k (1%)
R2
10k (1%)
VIN=4.5V-5.5V
C1
47uF
C2
47uF
C3
47uF
GND
QT
Vishay Si4164DY
4
C1-C3 ceramic, 10V
L1, Wurth Elektronik
0.82uH, 27A, 0.9 mOhm
1
2
VOUT=2.5V, 0-15A
QB
Vishay Si4164DY
Csnb
3.9nF
C5
220uF
C6
220uF
GND
4
Rsnb
C5-C6 SANY O
0.2 Ohm
POSCAP
6TPE220MI, 6.3V,
18mOhm
Snubber components
are optional
© 2010 Exar Corporation
Page 13 of 17
Rev. 1.0.0