X RP7 6 6 5
3 A 1 8 V S y n c h r o n o u s S t e p - D o w n Co n v e r t e r
PIN DESCRIPTION
Name
BS
Pin Number
1
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 signal 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.
Forcing this pin above 2.7V enables the IC. Forcing this pin below
Soft - start control input pin.
Connect a capacitor from SS to GND to set the soft
the soft start period to 1
5ms. To disable the soft
Exposed Pad
Connect to GND through PCB .
0.75 V shuts down the
IN
SW
GND
2
3
4
FB
5
COMP
6
EN
7
SS
-
8
EP
- start period. A 0.1µF capaci
tor sets
- start feature, leave SS unconnected.
ORDERING INFORMATION
Part Number
XRP766 5ID BTR- F
XRP766 5EVB
Temperature
Range
Marking
Package
SOIC -8(EP)
Packing
Quantity
2.5 K/Tape & Reel
Note 1
RoHS Compliant
Halogen Free
Note 2
XRP766 5I
YYWWF
-
A
X
XRP766 5 Evaluation Board
; when applicable.
© 2013 Exar Corporation
4/ 12
Rev. 2.0. 1
EXAR [ EXAR CORPORATION ]
