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Exar XRP7664-65-74-75 Manual

2a/3a 18v synchronous step-down regulator, constant frequency (xrp7664-65), light-load efficiency (xrp7674-75)
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August 2014
GENERAL DESCRIPTION
The EXAR XRP76XX Evaluation kit is a fully
assembled and tested surface-mount PCB that
demonstrates
the
XRP7674
and
XRP7675
regulators.
The
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
configured to operate under the following
conditions and parameters:
• Input voltage range:
• Output voltage range:
• Output current/load range:
EVALUATION BOARD SCHEMATICS
VIN
C2
DNP
GND
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
2A/3A 18V Synchronous Step-Down Regulator, Constant frequency
XRP7664,
XRP7665,
synchronous buck
current-mode
switching
evaluation
board
4.5V - 18V
0 – 2A/3A
J1
EN=VIN
R4 100k
U1
CBS
10nF
XRP76XX
1
BS
SS
2
IN
EN
3
SW
COMP
SW
4
C1
GND
FB
uF
Fig. 1: XRP76XX Evaluation Board Schematics
(XRP7664-65), Light-Load efficiency (XRP7674-75)
EVALUATION BOARD MANUAL
FEATURES
• 2A/3A Continuous Output Current
• 4.5V to 18V Wide Input Voltage
• PWM Current-Mode Control
is
• Adjustable Output Voltage
− 2% Accuracy
• Programmable Soft-Start and Enable
Function
3.3V
• Constant frequency (XRP7664-65)
• Light-load efficiency (XRP7674-75)
• Built-in Thermal, Over Current, UVLO
and Output Over-Voltage Protections
• RoHS Compliant "Green"/Halogen Free
8-Pin Exposed Pad SOIC Package
EN=EXT
EN
1
CSS
0.1uF
8
7
L1
SW
6
CC1
CC
uH
5
DNP
nF
FB
RC
k
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
XRP7664-65-74-75
SW
1
VOUT
R1
26.1k
C3
C4
FB
22uF
22uF
R2
10k
GND
Rev. 2.0.0
www.exar.com

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Summary of Contents for Exar XRP7664-65-74-75

  • Page 1 XRP7664-65-74-75 2A/3A 18V Synchronous Step-Down Regulator, Constant frequency (XRP7664-65), Light-Load efficiency (XRP7674-75) August 2014 Rev. 2.0.0 GENERAL DESCRIPTION EVALUATION BOARD MANUAL The EXAR XRP76XX Evaluation kit is a fully assembled and tested surface-mount PCB that demonstrates XRP7664, XRP7665, XRP7674 XRP7675 synchronous buck regulators.

  • Page 2: Pin Assignment

    XRP7664-65-74-75 2A/3A 18V Synchronous Step-Down Regulator, Constant frequency (XRP7664-65), Light-Load efficiency (XRP7674-75) PIN ASSIGNMENT Fig. 2: XRP7664-65-74-75 Pin Assignment, Exposed Pad applicable to XRP7665 and XRP7675 PIN DESCRIPTION Name Pin Number Description Bootstrap pin. Connect a 0.01uF or larger bootstrap capacitor between the BS pin and the SW pin.

  • Page 3: Using The Evaluation Board

    XRP7664-65-74-75 2A/3A 18V Synchronous Step-Down Regulator, Constant frequency (XRP7664-65), Light-Load efficiency (XRP7674-75) USING THE EVALUATION BOARD supplied from EXAR with jumper set at left- side (position marked EN=VIN). This allows for automatic startup of the XRP76XX regulator NITIAL ETUP when VIN is applied.

  • Page 4: Evaluation Board Schematics

    XRP7664-65-74-75 2A/3A 18V Synchronous Step-Down Regulator, Constant frequency (XRP7664-65), Light-Load efficiency (XRP7674-75) EVALUATION BOARD SCHEMATICS EN=VIN EN=EXT R4 100k 10nF XRP76XX 0.1uF VOUT COMP 26.1k 22uF 22uF © 2014 Exar Corporation Rev. 2.0.0...
  • Page 5 Resistor 6.81k Ohm, 1% Panasonic ERJ-3EKF1003V Resistor 100k Ohm, 1% Wurth Elektronik 61304011121 Conn. Header 0.1" 3POS J1(JUMPER) Wurth Elektronik 609002115121 CONN JUMPER SHORT. VIN, VOUT, GND, EN, SW Vector Electronic K24C/M .042 Dia Test Point Post © 2014 Exar Corporation Rev. 2.0.0...
  • Page 6 Resistor 13K Ohm, 1% Vishay/Dale CRCW0603100KFKEA Resistor 100K Ohm, 1% Wurth Elektronik 61304011121 Conn. Header 0.1" 3POS J1(JUMPER) Wurth Elektronik 609002115121 CONN JUMPER SHORT. VIN, VOUT, GND, EN, SW Vector Electronic K24C/M .042 Dia Test Point Post © 2014 Exar Corporation Rev. 2.0.0...

  • Page 7: Evaluation Board Layout

    XRP7664-65-74-75 2A/3A 18V Synchronous Step-Down Regulator, Constant frequency (XRP7664-65), Light-Load efficiency (XRP7674-75) EVALUATION BOARD LAYOUT Fig. 3: Component Placement – Top Side Fig. 4: Layout – Bottom Side © 2014 Exar Corporation Rev. 2.0.0...

  • Page 8: 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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