B130 查看數據表（PDF） - Exar Corporation

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B130

3A 18V Synchronous PFM/ PWM Step-Down Regulator

Exar Corporation 

PIN ASSIGNMENT

XRP7 6 7 5

3 A 1 8 V Sy n ch r on ou s PFM/ PW M St ep - Dow n Reg u lat or

Fig. 3: XRP7675 Pin Assignment ( Exposed Pad SOIC - 8)

PIN DESCRIPTION

Name

Pin Number

BS

1

IN

2

SW

3

GND

4

FB

5

COMP

6

EN

SS

GND

7

8

Exposed Pad

Description

Bootstrap pin.

Connect a 0.01µF or greater bootstrap capacitor between the BS pin and the SW pin.

The voltage across the bootstrap capacitor drives the internal high

- side power MOSFET.

Power input pin.

A capacitor should be connected between the IN pin and GND pin to keep the input

voltage constant.

Power switch output pin.

This pin is connected to the inductor and the bootstrap capacitor.

Ground pin.

Feedback pin.

An external resistor divider connected to FB 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 o scillator frequency is lowered to achieve short - circuit

protection.

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.

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 1µA.

This input

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operations.

Soft - start control input pin.

Connec t a capacitor from SS to GND to set the soft

the soft start period to 1 5ms. To disable the soft

- start period. A 0.1µF capacitor sets

- start feature, leave SS unconnected.

Connect to ground signal

ORDERING INFORMATION

Part Number

XRP7675 ID BTR- F

XRP7675 EVB

Temperature

Range

Marking

XRP7675 I

- ƒ&A””7ƒ& YYWWF

X

XRP7675 Evaluation Board

Package

HSOIC -8

Packing

Quantity

Note 1

2.5 K/Tape & Reel RoHS Compliant

Halogen Free

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© 2013 Exar Corporation

4/ 12

Note 2

Rev. 1.0.0

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