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Exar XRP6142 Manual

Synchronous step-down controller with ddr memory termination
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Table of Contents

July 2010
GENERAL DESCRIPTION
The EXAR XRP6142 Evaluation kit is a fully
assembled and tested surface-mount PCB that
demonstrates the XRP6142 constant on-time
buck
controller.
The
supply regulator generates a preset 2.5V
output with a load of up to 15A.
The EVB kit requires a single input voltage V
source of 4.5V to 5.5V if V
jumper J1. If V
CC
independent 5V supply then the converter can
operate with V
ranging from 3.3V to 5.5V.
IN
EVALUATION BOARD SCHEMATICS
V I N
1
1
2
2
J1
3
3
EXT
V C C
O FF
1
1
2
2
J2
3
3
O N
E N
R1
3 8 .3 k, 1 %
R2
1 0 k, 1 %
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
S
y
S
y
switch-mode
power
is tied to V
CC
IN
is supplied through an
RV C C
1 0 O hm
C V C C 1
C V C C
C 4
4 .7 uF
0 .1 uF
0 .1 uF
C BST
0
PAD
1
XRP6142EL2.0-F
12
AGND
GH
2
U1
11
VTTREF
SW
3
10
VDDQ/2
GL
4
9
VREF
PGND
C FF
1 nF
RL I M
Figure 1: XRP6142 Evaluation Board Schematics
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S
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p
E
E
V
V
IN
via
FEATURES
• Input Voltage Range of 4.5V – 5.5V
(V
=V
CC
IN
• Input Voltage Range of 3.3V – 5.5V
(V
=5V)
CC
• 15A output current
• Current limit with hiccup
• Internal soft-start
• Internal bootstrap diode
• No compensation required
• Precision Enable
0 .1 uF
Q T
S i4 1 6 4 D Y
4
L 1
1
0 .8 2 uH
Q B
Si4 1 6 4 D Y
4
2 .2 k
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
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O
N
N
B
B
O
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A
A
R
R
D
D
M
M
)
T P 1
V I N
C 1
C 2
C 3
4 7 uF
4 7 uF
4 7 uF
G N D
T P 2
T P 3
2
V O U T
C 5
C 6
C s nb
2 2 0 uF
2 2 0 uF
3 .9 nF
G N D
Rs nb
0 .2 2 O hm
T P 4
X
R
P
6
1
4
2
X
R
P
6
1
4
2
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Rev. 0.0.2
A
A
N
N
U
U
A
A
L
L
www.exar.com

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Summary of Contents for Exar XRP6142

  • Page 1 July 2010 Rev. 0.0.2 GENERAL DESCRIPTION The EXAR XRP6142 Evaluation kit is a fully assembled and tested surface-mount PCB that demonstrates the XRP6142 constant on-time buck controller. switch-mode power supply regulator generates a preset 2.5V output with a load of up to 15A.

  • Page 2: Pin Assignement

    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. Vin and Vcc can be tied together when Vin ≥ 3.0V Precision enable pin. Pulling this pin above 1.2V will turn the part on...

  • Page 3: Using The Evaluation Board

    OFF). The board will power-up and regulate signal to be applied to EN. The Board is the output upon turning on the input supply. supplied from EXAR with jumper set at left The mean V is 2.48V for the pair of the side (position marked OFF).

  • Page 4: Evaluation Board Layout

    EVALUATION BOARD LAYOUT Figure 3: Top metal Figure 4: Bottom metal Figure 5: Internal layer 1 (Ground) Figure 6: Internal layer 2 (Ground) Figure 7: Component Placement © 2010 Exar Corporation Rev. 0.0.2...

  • Page 5: Bill Of Material

    BILL OF MATERIAL Reference Qty. Manufacturer Manufacturer Size Component Designator Part Number Exar XRP6142EB XRP6142 Evaluation kit Exar XRP6142EL2.0-F QFN-16 Constant on-time Buck Controller SO-8 QT, QB Vishay, Siliconix Si4164DY N-Ch. UltraFET TrenchMOSFET Wurth Elektronik 744355182 13x14mm Inductor 0.82uH, 1.2mOhm, 27A...

  • Page 6: Revision History

    EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness.

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