TPS65263-Q1_15 Datasheet, PDF (29/47 Pages) Texas Instruments – TPS65263-Q1 4.0- to 18-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous Step-Down Converter With I2C Controlled Dynamic Voltage Scaling

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8 Application and Implementation
TPS65263-Q1
SLVSCS9B – DECEMBER 2014 – REVISED JANUARY 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The device is triple-synchronous step-down dc/dc converter with I²C interface. It is typically used to convert a
higher dc voltage to lower dc voltages with continuous available output current of 3 A/2 A/2 A.
8.2 Typical Application
The following design procedure can be used to select component values for the TPS65263-Q1. This section
presents a simplified discussion of the design process.
VIN 4 to 18 V
VIN
C5
10 µF
C6
C7
10 µF 10 µF
C4
1 µF
GND
GND
C9
1 µF
C11
GND 22 pF
R8
10.0 kΩ
C14
C15 22pF
2200 pF
GND
R10
10.0 kΩ
C16
C18 22 pF
3300 pF
GND
V7V
R12
10.0 kΩ _EN1
EN2
C19
EN3
3300 pF
GND
U?
29
28
12
13
VIN
PVIN1
PVIN2
PVIN3
30 _V7V
23 _COMP1
7 _COMP2
18 _COMP3
31
32
1
EN1
EN2
EN3
24
8
17
SS1
SS2
SS3
SDA
SCL
C21
0.01 µF C22
0.01 µF C25
0.01 µF
GND
GND
GND
2
3
SDA
SCL
PAD
4 _AGND
TPS65263Q
GND
BST1 ²⁵
LX1 ²⁶
C1
0.047 µF
R1
0
FB1
BST2
LX2
22 _VFB1
C10
0.047 µF
9
R7
0
10
VOUT2
FB2
BST3
LX3
5
6 _VFB2
C20
0.047 µF
16
R15
0
15
FB3 ¹⁹ VFB3
PGOOD ²⁰
ROSC ²¹
PGND1
PGND2
PGND3
27
11
14
R30
V7V
R23 ^{100 kΩ}
88.7 kΩ
GND
L1
4.7 µH
L2
4.7 µH
L3
4.7 µH
GND
C2
C3
22 µF 22 µF
GND GND
C12
C13
22 µF 22 µF
GND GND
C23
C24
22 µF 22 µF
GND GND
Figure 42. Typical Application Schematic
R6
15.0 kΩ
C8
VFB1
R5
10.0 kΩ
82 pF
GND
R14
10.0 kΩ
C17
VFB2
R13
10.0 kΩ
VOUT1 1.5 V 3 A
VOUT1
VOUT2 1.2 V 2 A
VOUT2
(VOUT2 0.68 to 1.95 V via I²C)
100pF
GND
R22
31.6 kΩ
C26
VFB3
R21
10.0 kΩ
22 pF
GND
VOUT3 2.5 V 2 A
VOUT3
8.2.1 Design Requirements
This example details the design of triple-synchronous step-down converter. A few parameters must be known to
start the design process. These parameters are typically determined at the system level. For this example, we
start with the following known parameters:
Table 9. Design Parameters
PARAMETER
Vout1
Iout1
Vout2
Iout2
Vout3
Iout3
Transient response 1-A load step
Input voltage
Output voltage ripple
Switching frequency
VALUE
1.5 V
3A
1.2 V
2A
2.5 V
2A
±5%
12 V normal, 4 to 18 V
±1%
500 kHz
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