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| XR77103 Datasheet, PDF (7/28 Pages) Exar Corporation – 3-Output Programmable Buck Regulator | |||
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Pin Configuration
XR77103
32 31 30 29 28 27 26 25
VOUT3 1
24 PGOOD
COMP3 2
23 VL
A0 3
22 SCL
VIN 4
21 SDA
GND 5
20 nWR
VCC 6
19 DGND
COMP1 7
18 COMP2
VOUT1 8
9
17 VOUT2
10 11 12 13 14 15 16
Pin Functions
Pin Number
Pin Name Description
1
VOUT3
Buck 3 output sense pin.
2
COMP3
Compensation pin for Buck 3. Connect a series RC circuit to this pin for compensation.
3
A0
I2C address select pin. A0 is internally pulled HIGH through a 100k⦠pull up resistor.
4
VIN(1)
IC supply pin. Connect a capacitor as close as possible to this pin and AGND.
5
GND
Ground.
6
VCC
Internal supply. Connect a ceramic capacitor from this pin to AGND. VCC tied to VIN for VIN = 5V
7
COMP1
Compensation pin for Buck 1. Connect a series RC circuit to this pin for compensation.
8
VOUT1
Buck 1 output sense pin.
9
BST1
Bootstrap capacitor for Buck 1. Connect a bootstrap capacitor from this pin to LX1.
10
VIN1(1)
Input supply for Buck 1. Connect a capacitor as close as possible to this pin and PGND.
11
LX1
Switching node for Buck 1.
12
LX1
Switching node for Buck 1.
13
LX2
Switching node for Buck 2.
14
LX2
Switching node for Buck 2.
15
VIN2(1)
Input supply for Buck 2. Connect a capacitor as close as possible to this pin and PGND.
16
BST2
Bootstrap capacitor for Buck 2. Connect a bootstrap capacitor from this pin to LX2.
17
VOUT2
Buck 2 output sense pin.
18
COMP2
Compensation pin for Buck 2. Connect a series RC circuit to this pin for compensation.
19
DGND
Digital ground.
20
nWR
Write protection input for NVM. The data can be written to NVM when this pin is low. This pin is internally
pulled high through 100k⦠pull up resistance.
NOTE:
1. VIN, VIN1, VIN2, and VIN3 must be tied together.
REV1B
7/28
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