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Exar XRP6141 User Manual

35a synchronous step down cot controller
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November 2013

GENERAL DESCRIPTION

The XRP6141 is a synchronous step-down
controller for point-of load supplies up to 35A.
A wide 4.5V to 22V input voltage range allows
for single supply operation from industry
standard 5V, 12V and 19.6V rails.
With a proprietary emulated current mode
Constant On-Time (COT) control scheme, the
XRP6141 provides extremely fast line and load
transient
response
capacitors. It requires no loop compensation
hence simplifying circuit implementation and
reducing
overall
component
control loop also provides exceptional line
regulation and maintains constant operating
frequency.
A selectable power saving mode,
allows the user to operate in discontinuous
mode (DCM) at light current loads thereby
significantly
increasing
efficiency.
A host of protection features, including over-
current, over-temperature, short-circuit and
UVLO, help achieve safe operation under
abnormal operating conditions.
EN/MODE
CSS
47nF
PWRGD
R4
AGND
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
3
3
using
ceramic
output
count.
the
converter
D1
MMSZ4699T1G
R9 2.5k,
R8 1k,
R7 6k,
R6 2k
J1
Forced CCM
DCM/CCM
RLIM 1.8k,1%
RON
11.8k
CBST 1uF
RBST
0 Ohm
9
4
SS
GH
10
3
PGOOD
SW
10k
U1
11
XRP6141
2
FB
NC
12
1
AGND
GL
17
EXPAD
CIN
0.1uF
R5
OPEN
CVCC
4.7uF
VCC
Fig. 1: XRP6141 Evaluation Board Schematics
5
A
S
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n
c
h
r
o
n
o
u
s
5
A
S
y
n
c
h
r
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n
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u
E
V
E
V
The

FEATURES

• 35A Capable Step Down Controller
− Wide Input Voltage Range
− Integrated high Current 2A/3A Drivers
− 0.6V to 18V Adjustable Output Voltage
• Proprietary Constant On-Time Control
− No Loop Compensation Required
− Ceramic Output Cap. Stable operation
− Programmable 200ns-2µs
− Quasi Constant 200kHz-800kHz Freq.
− Selectable CCM or CCM/DCM Operation
C1,C2,C3,C4
VIN
CERAMIC 1210 X7R
C1
22uF
MT
FDMS7578
T5
T6
L1 IHLP-5050FD-01
0.47uH @ 41A, 1mOhm
Rsnub
1 Ohm
MB
FDMS7650DC
R3
Csnub
0 Ohm
6.8nF
T7
T8
CFF
R1
0.56nF
10k,1%
R2
VIN
10k,1%
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
S
t
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p
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w
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C
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s
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p
D
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C
O
A
L
U
A
T
I
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N
B
O
A
R
D
M
A
L
U
A
T
I
O
N
B
O
A
R
D
M
5V to 22V Single Supply
o
4.5V to 5.5V Low Vin
o
12V
VIN+
C2
C3
C4
C5
T9
22uF
22uF
22uF
22uF
T10
VIN-
C5,C6,C7,C8 POSCAP
1.2V @ 0-25A
2R5TPE330M7
C6
C7
C8
C9
C10
C11
C12
C13
T1
330uF
330uF
330uF
330uF
OPEN
OPEN
OPEN
OPEN
T2
T3
T4
X
R
P
6
1
4
1
X
R
P
6
1
4
1
T
C
o
n
t
r
o
l
l
e
r
T
C
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t
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r
Rev. 1.0.0
A
N
U
A
L
A
N
U
A
L
VOUT+
VOUT-
www.exar.com

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Summary of Contents for Exar XRP6141

  • Page 1: General Description

    A wide 4.5V to 22V input voltage range allows for single supply operation from industry standard 5V, 12V and 19.6V rails. With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XRP6141 provides extremely fast line and load transient response using ceramic output capacitors.

  • Page 2: Pin Assignment

    PIN ASSIGNMENT PGND AGND AGND EXPOSED PAD PGOOD ILIM Fig. 2: XRP6141 Pin Assignment PIN DESCRIPTION Name Pin Number Description Driver output for Low-side N-channel synchronous MOSFET. Internally not connected. Leave this pin floating. Lower supply rail for high-side gate driver GH. Connect this pin to the junction between the two external N-channel MOSFETs.
  • Page 3 34A. on load, at VIN=12V(+/-10%). In order to operate in DCM/CCM over a wider VIN range, remove Jumper and apply an auxilary voltage in the range of 3.1V-5V to the EN test point. © 2013 Exar Corporation Rev. 1.0.0...
  • Page 4 0.47uH @ 41A, 1mOhm 2R5TPE330M7 PGOOD XRP6141 330uF 330uF 330uF 330uF OPEN OPEN OPEN OPEN AGND Rsnub 1 Ohm VOUT- EXPAD FDMS7650DC AGND Csnub 0 Ohm 6.8nF 0.56nF 10k,1% 0.1uF OPEN CVCC 4.7uF 10k,1% © 2013 Exar Corporation Rev. 1.0.0...

  • Page 5: Bill Of Material

    BILL OF MATERIAL Reference Qty. Manufacturer Manufacturer Size Component Designator Part Number Exar XRP6141EVB XRP6141 Evaluation kit Exar XRP6141 QFN-16 Constant On-Time Buck controller FAIRCHILD FDMS7578 Power SO-8 N-Ch. 25V, 5.8mOhm MOSFET FAIRCHILD FDMS7650DC Power SO-8 N-Ch. 30V, 100A, 0.99mOhm, MOSFET...
  • Page 6 EVALUATION BOARD LAYOUT Fig. 4: Bottom Side Fig. 3: Component Placement – Top Side Fig. 5: Layer 2 Fig. 6: Layer 3 © 2013 Exar Corporation Rev. 1.0.0...

  • Page 7: Document 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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