Exar XRP6141 User Manual

XXRRPP66114

11

rr

Rev. 1.0.0

Forc ed CCM DCM/CCM

J1

1

1

2

2

3

3

R3

0 Ohm

R8 1k,

R9 2.5k,

U1
XRP6141

GL

1

SW

3

NC

2

GH

4

SS

9

PGOOD

10

FB

11

AGND

12

BST

5

ILIM

6

EN

7

TON

8

AGND

13

VIN14VCC

15

PGND

16

EXPAD

17

VCC

1.2V @ 0-25A

12V

Csnub

6.8nF

C1

22uF

CVCC 4.7uF

VOUT+

T1

PWRGD

C1,C2,C3,C4
CERAM IC 1210 X7R

C2

22uF

VOUT-

L1 IHLP- 5050FD- 01

0.47uH @ 41A, 1m Ohm

C3

22uF

C4

22uF

R1
10k,1%

VIN

CBST 1uF

R2
10k,1%

CSS

47nF

EN/MODE

CIN 0.1uF

R6 2k

T2

R7 6k ,

T9

T10

T5

T7

T6

R4 10k

R5
OPEN

AGND

CFF

0.56nF

MT

FDMS7578

C6
330uF

C7
330uF

C8
330uF

D1 MMSZ4699T1G

C10
OPEN

VIN

T8

T3

T4

RON 11. 8k

VIN+

MB

FDMS7650DC

C5

22uF

C11
OPEN

C12
OPEN

RBST
0 Ohm

RLIM 1.8k, 1%

C9

330uF
Rsnub
1 Ohm

VIN-

C5,C6,C7,C8 POSCAP
2R5TPE330M 7

C13
OPEN

4

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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 using ceramic output
capacitors. It requires no loop compensation
hence simplifying circuit implementation and
reducing overall component count. The
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 the converter
efficiency.

A host of protection features, including over­current, over-temperature, short-circuit and
UVLO, help achieve safe operation under
abnormal operating conditions.

EEVVAALLUUAATTIIOONN BBOOAARRDD MMAANNUUAALL

FEATURES

• 35A Capable Step Down Controller

− Wide Input Voltage Range

o 5V to 22V Single Supply
o 4.5V to 5.5V Low Vin

− 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

e

Fig. 1: XRP6141 Evaluation Board Schematics

Exar Corporation www.exar.com
48720 Kato Road, Fremont CA 94538, USA Tel. [phone] – Fax. [phone]