XR77103 Datasheet, PDF (8/28 Pages) Exar Corporation – 3-Output Programmable Buck Regulator

XR77103
Pin Functions (Continued)
Pin Number
Pin Name Description
21
SDA
Data I/O pin for I²C serial interface.
22
SCL
Clock input pin for I²C serial interface.
23
VL
Supply pin for I²C interface. Supply 3.3V typically for I²C communication. This pin can be left floating if the I²C
interface is not used.
24
PGOOD
Power good output. Open drain output asserted after all converters are sequenced and within regulation.
25
SYNC
External clock input pin. Connect to AGND when unused.
26
EN
Enable control input. Set EN high to enable converters.
27
AGND
Analog ground.
28
VIN⁽¹⁾
IC supply pin. Connect a capacitor as close as possible to this pin and AGND.
29
LX3
Switching node for Buck 3.
30
LX3
Switching node for Buck 3.
31
VIN3⁽¹⁾
Input supply for Buck 3. Connect a capacitor as close as possible to this pin and PGND.
32
BST3
Bootstrap capacitor for Buck 3. Connect a bootstrap capacitor from this pin to LX3.
-
e-PAD
Power ground (PGND).
NOTE:
1. VIN, VIN1, VIN2, and VIN3 must be tied together.
REV1B
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