Exar XRP7664-65-74-75 Manual de usuario

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

August 2014 Rev. 2

.0.0

Exar Corporation www.exar.com

48720 Kato Road, remont CA 94538, USA Tel. +1 510 668-7000 – ax. +1 510 668-7001

GENERAL DESCRIPTION

The EXAR XRP76XX Evaluation kit is a fully

assembled and tested surface-mount PCB that

demonstrates the XRP7664, XRP7665,

XRP7674 and XRP7675 synchronous buck

regulators. The current-mode switching

regulator generates a preset 3.3V output with

a load of up to 2A (XRP7664, XRP7674) and

3A (XRP7665, XRP7675).

The EVB kit requires a single input voltage VIN

source if EN is tied to VIN via jumper J1

(default setting as supplied from EXAR). If J1

is set to EN=EXT position then a logic-level

signal is required at EN pin in order to turn the

regulator on and off.

STANDARD CONFIGURATION

The XRP76XXEVB evaluation board is

configured to operate under the following

conditions and parameters:

•Input voltage range: 4.5V - 18V

•Output voltage range: 3.3V

•Output current/load range: 0 – 2A/3A

EVALUATION BOARD MANUAL

FEATURES

•2A/3A Continuous Output Current

•4.5V to 18V Wide Input Vo tage

•PWM Current-Mode Contro

•Adjustab e Output Vo tage

−2% Accuracy

•Programmab e Soft-Start and Enab e

Function

•Constant frequency (XRP7664-65)

•Light- oad efficiency (XRP7674-75)

•Bui t-in Therma , Over Current, UVLO

and Output Over-Vo tage Protections

•RoHS Comp iant “Green”/Ha ogen Free

8-Pin Exposed Pad SOIC Package

EVALUATION BOARD SCHEMATICS

ig. 1: XRP76XX Evaluation Board Schematics

22uF

CSS 0.1uFCBS 10nF

CC1

DNP

R4 100k

DNP C3

22uF

GND

VIN

VOUT

GND

XRP76XX

GND

4FB 5

COMP 6

EN 7

SS 8

uH R1

26.1k

10k

EN=EXTEN=VIN

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

PIN ASSIGNMENT

ig. 2: XRP7664-65-74-75 Pin Assignment, Exposed Pad applicable to XRP7665 and XRP7675

PIN DESCRIPTION

Name Pin Number Description

BS 1

Bootstrap pin. Connect a 0.01u or larger bootstrap capacitor between the BS pin and

the SW pin. The voltage across the bootstrap capacitor drives the internal high-side

power MOS ET.

IN 2 Supply input pin. A capacitor should be connected between the IN pin and GND pin to

keep the input voltage constant.

SW 3 Power switch output pin. This pin is connected to the inductor and the bootstrap

capacitor.

GND 4 Ground pin.

B 5

eedback pin. An external resistor divider connected to B programs the output voltage.

If the feedback pin exceeds 1.1V the over-voltage protection will trigger. If the

feedback voltage drops below 0.3V the oscillator frequency is lowered to short-circuit

protection.

COMP 6

Compensation pin. This is the output of transconductance error amplifier and the input

to the current comparator. It is used to compensate the control loop. Connect an RC

network form this pin to GND.

EN 7

Control input pin.

Drive EN high/low in order to turn on/off the regulator. When the IC is in shutdown

mode all functions are disabled to decrease the supply current below 0.1µA nominal.

SS 8

Soft-start control input pin. Connect a capacitor from SS to GND to set the soft-start

period. A 0.1µ capacitor sets the soft start period to 15ms. To disable the soft-start

feature, leave SS unconnected.

ORDERING INFORMATION

Refer to XRP7664-65-74-75’s datasheet and/or www.exar.com for exact and up to date ordering

information.

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

USING THE EVALUATION BOARD

NITIAL

ETUP

Set the input supply to 12V and connect it to

VIN and GND connectors on the left side of the

evaluation board. Connect the load to the

VOUT and GND connectors at the right side of

the board. Check to make sure that jumper J1

is set to the left side (position marked

EN=VIN). The board will power up and

regulate the output at 3.3V upon turning on

the input supply. The XRP76XX should provide

nominal efficiency equal to figure 4 of the

datasheet.

UMPER

FUNCTION

Jumper J1 can be used to either connect EN to

VIN or allow an independent logic-level control

signal to be applied to EN. The board is

supplied from EXAR with jumper set at left-

side (position marked EN=VIN). This allows for

automatic startup of the XRP76XX regulator

when VIN is applied.

SETTING THE OUTPUT VOLTAGE

Use an external resistor divider to set the

output voltage. Program the output voltage

from:

1  2  



0.925 1

Where:

R1 is the resistor between V

OUT

and B

R2 is the resistor between B and GND

(nominally 10kΩ)

0.925V is the nominal feedback voltage.

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

EVALUATION BOARD SCHEMATICS

22uF

CSS 0.1uFCBS 10nF

CC1

DNP

R4 100k

DNP C3

22uF

GND

VIN

VOUT

GND

XRP76XX

GND

4FB 5

COMP 6

EN 7

SS 8

uH R1

26.1k

10k

EN=EXTEN=VIN

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

XRP7664 BILL OF MATERIAL

XRP7665 BILL Of MATERIAL

Reference Qty. Manufacturer Part Number Size Component

PCB 1 Exar XRP7664EVB 1.3"x2" XRP7664 Evaluation kit

U1 1 Exar XRP7664 SO-8 2A Buck regulator

L1 1 COOPER-Bussmann DR74-100R 7.6x7.6mm 10uH shielded inductor

C1 1 Murata Corp. GRM32DR61E106KA12L 1210 CER CAP 10u , 25V, X5R

C3, C4 2 Murata Corp. GRM31CR61A226ME19L 1206 CER CAP 22u , 10V, X5R

CBS 1 Murata Corp. GRM188R71H103KA01D 0603 CAR CEP 10000p , X7R, 50V

CC 1 Murata Corp. GRM188R71H332KA01D 0603 CAP CER 3300p , X7R, 50V

CSS 1 Murata Corp. GRM188R71H104KA57D 0603 CAP CER 0.1u , X7R, 50V

R1 1 Panasonic ERJ-3EK 2612V 0603 Resistor 26.1K Ohm, 1%

R2 1 Panasonic ERJ-3EK 1002V 0603 Resistor 10K Ohm, 1%

RC 1 Panasonic ERJ-3EK 5621V 0603 Resistor 5.62K Ohm, 1%

R4 1 Panasonic ERJ-3EK 1003V 0603 Resistor 100K Ohm, 1%

J1 1 Wurth Elektronik 61304011121 Conn. Header 0.1" 3POS

J1(JUMPER) 1 Wurth Elektronik 609002115121 CONN JUMPER SHORT.

VIN, VOUT, GND, EN, SW 6 Vector Electronic K24C/M .042 Dia Test Point Post

Reference Qty. Manufacturer Part Number Size Component

PCB 1 Exar XRP7665EVB 1.3"x2" XRP7665 Evaluation kit

U1 1 Exar XRP7665 PSO-8 3A Buck Regulator

L1 1 Wurth Elektronik 744314850 7x7x5mm 8.5uH shielded inductor

C1 1 Murata Corp. GRM32ER61E226KE15L 1210 CER CAP 22u , 25V, X5R

C3, C4 2 Murata Corp. GRM31CR61A226KE19L 1206 CER CAP 22u , 10V, X5R

CBS 1 Murata Corp. GRM188R71H103KA01D 603 CAP CEP 10000p , X7R, 50V

CC 1 Murata Corp. GRM188R71H392KA01D 603 CAP CER 3900p , X7R, 50V

CSS 1 Murata Corp. GRM188R71H104KA57D 603 CAP CER 0.1u , X7R, 50V

R1 1 Panasonic ERJ-3EK 2612V 603 Resistor 26.1k Ohm, 1%

R2 1 Panasonic ERJ-3EK 1002V 603 Resistor 10k Ohm, 1%

RC 1 Panasonic ERJ-3EK 6821V 603 Resistor 6.81k Ohm, 1%

R4 1 Panasonic ERJ-3EK 1003V 603 Resistor 100k Ohm, 1%

J1 1 Wurth Elektronik 61304011121 Conn. Header 0.1" 3POS

J1(JUMPER) 1 Wurth Elektronik 609002115121 CONN JUMPER SHORT.

VIN, VOUT, GND, EN, SW 6 Vector Electronic K24C/M .042 Dia Test Point Post

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

XRP7674 BILL OF MATERIAL

XRP7675 BILL Of MATERIAL

Reference Qty. Manufacturer Part Number Size Component

PCB 1 Exar XRP7674EVB 1.3"x2" XRP7674 Evaluation kit

U1 1 Exar XRP7674 SO-8 2A Buck Regulator, light-load efficient

L1 1 COOPER-Bussmann DR74-100R 7.6x7.6mm 10uH shielded inductor

C1 1 Murata Corp. GRM32DR61E106KA12L 1210 CER CAP 10u , 25V, X5R

C3, C4 2 Murata Corp. GRM31CR61A226ME19L 1206 CER CAP 22u , 10V, X5R

CBS 1 Murata Corp. GRM188R71H103KA01D 0603 CAR CEP 10000p , X7R, 50V

CC 1 Murata Corp. GRM188R71H472KA01D 0603 CAP CER4700p , X7R, 50V

CSS 1 Murata Corp. GRM188R71H104KA57D 0603 CAP CER 0.1u , X7R, 50V

R1 1 Vishay/Dale CRCW060326K1 KEA 0603 Resistor 26.1K Ohm, 1%

R2 1 Vishay/Dale CRCW060310K0 KEA 0603 Resistor 10K Ohm, 1%

RC 1 Vishay/Dale CRCW060313K0 KEA 0603 Resistor 13K Ohm, 1%

R4 1 Vishay/Dale CRCW0603100K KEA 0603 Resistor 100K Ohm, 1%

J1 1 Wurth Elektronik 61304011121 Conn. Header 0.1" 3POS

J1(JUMPER) 1 Wurth Elektronik 609002115121 CONN JUMPER SHORT.

VIN, VOUT, GND, EN, SW 6 Vector Electronic K24C/M .042 Dia Test Point Post

Reference Qty. Manufacturer Part Number Size Component

PCB 1 Exar XRP7675EVB 1.3"x2" XRP7675 Evaluation kit

U1 1 Exar XRP7675EVB PSO-8 3A Buck Regulator, Light-Load efficient

L1 1 Wurth Elektronik 744314850 7x7x5mm 8.5uH shielded inductor

C1 1 Murata Corp. GRM32ER61E226KE15L 1210 CER CAP 22u , 25V, X5R

C3, C4 2 Murata Corp. GRM31CR61A226ME19L 1206 CER CAP 22u , 10V, X5R

CBS 1 Murata Corp. GRM188R71H103KA01D 603 CAR CEP 10000p , X7R, 50V

CC 1 Murata Corp. GRM188R71H332KA01D 603 CAP CER 3300p , X7R, 50V

CSS 1 Murata Corp. GRM188R71H104KA57D 603 CAP CER 0.1u , X7R, 50V

R1 1 Vishay/Dale CRCW060326K1 KEA 603 Resistor 26.1K Ohm, 1%

R2 1 Vishay/Dale CRCW060310K0 KEA 603 Resistor 10K Ohm, 1%

RC 1 Vishay/Dale CRCW060313K0 KEA 603 Resistor 13K Ohm, 1%

R4 1 Vishay/Dale CRCW0603100K KEA 603 Resistor 100K Ohm, 1%

J1 1 Wurth Elektronik 61304011121 Conn. Header 0.1" 3POS

J1(JUMPER) 1 Wurth Elektronik 609002115121 CONN JUMPER SHORT.

VIN, VOUT, GND, EN, SW 6 Vector Electronic K24C/M .042 Dia Test Point Post

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

EVALUATION BOARD LAYOUT

ig. 3: Component Placement – Top Side

ig. 4: Layout – Bottom Side

XRP7664-65-74-

2A/3A 18V Synchronous Step-

Down Regu ator, Constant frequency

(XRP7664-65), Light-Load efficiency (XRP7674-

75)

DOCUMENT REVISION HISTORY

Revision Date Description

1.0.0 10/29/10 Initial release of XRP7664-65 EVB Manual

1.0.0 03/22/13 Initial release of XRP7674-75 EVB Manual

2.0.0 08/19/14 Initial release of combined XRP7664-65-74-75 EVB Manual

BOARD REVISION HISTORY

Board Revision

Date Description

146-6688-01 10/29/10 Initial release of evaluation board XRP7664-65

146-6688-04 03/22/13 Initial release of evaluation board XRP7674-75

146-6688-05 08/19/14 Initial release of combined XRP7664-65-74-75 EVB

FOR FURTHER ASSISTANCE

Email: customersupport@exar.com

Powertechsupport@exar.com

Exar Technical Documentation: http://www.exar.com/TechDoc/

XAR

ORPORATION

EADQUARTERS AND

ALES

FFICES

48720 Kato Road

remont, CA 94538 – USA

Tel.: +1 (510) 668-7000

ax: +1 (510) 668-7030

www.exar.com

NOTICE

EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve

design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,

conveys no license under any patent or other right, and makes no representation that the circuits are free of patent

infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a

user’s specific application. While the information in this publication has been carefully checked; no responsibility, however,

is assumed for inaccuracies.

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. Products are not authorized for use in such applications unless EXAR Corporation receives, in

writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all

such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.

Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.

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