XR77103 Datasheet, PDF (14/28 Pages) Exar Corporation – 3-Output Programmable Buck Regulator

Typical Performance Characteristics (Continued)
Thermal Characteristics
1.4
1.2V
1.2
1.8V
2.5V
1
3.3V
0.8
0.6
0.4
0.2
0
0
0.4
0.8
1.2
1.6
2
IOUT (A)
Figure 33. Channel 3 Power Loss at
f_SW = 1MHz, V_IN = 5V, No Airflow
Functional Block Diagram
28
VIN
46
VIN VCC
Internal
Supply
24
PGOOD
PGOOD
OSC
SYNC
25
10 ^VIN1
15 ^VIN2
31 ^VIN3
XR77103
BST3
32
30 ^LX3
29 ^LX3
1 ^VOUT3
2 ^COMP3
3 ^A0
BUCK3
NVM
I²C
Interface
BUCK1
BST1
9
LX1
12
LX1
11
VOUT1 ₈
COMP1 ₇
BUCK2
BST2 ₁₆
LX2 ₁₄
LX2 ₁₃
VOUT2 ₁₇
COMP2 ₁₈
nWR VL SDA SCL
20 23
21 22
EN AGND DGND GND
26 27 19 5 EP
Figure 34. Functional Block Diagram
REV1B
XR77103
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