TPS546C23 Datasheet, PDF (77/97 Pages) Texas Instruments – 4.5-V to 18-V, 35-A Stackable Synchronous Buck Converters With PMBus

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8 Applications and Implementation
TPS546C23
SLUSCC7A – JULY 2016 – REVISED AUGUST 2016
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 TPS546C23 devices are highly-integrated, synchronous step-down DC-DC converters. These devices are
used to convert a higher DC-input voltage to a lower DC-output voltage, with a maximum output current of 35 A.
Use the following design procedure to select key component values for this device, and set the appropriate
behavioral options through the PMBus.
8.2 Typical Application
8.2.1 4.5-V to 18-V Input, 1-V Typical Output, 35-A Converter
TP1
AVIN
C3
1µF
TP2
R1
PVIN
0
C4
6800pF
C5
6800pF
C6
C7
6800pF 22µF
TP3
C8
22µF
C9
22µF
C10
22µF
GND
C1
100µF
PVIN
C2
100µF
GND
C12
R3
1200pF ^1.10k
R4
10.0k
CHACHB
TP5
TP6
R5
49.9
R6
5.60k
C14
C21 2200p
270p
Rbias
Optional
C23
C24
0.1µF 4.7µF
R11
C25 34.8k
2.2µF
GND
CNTL
R9
10.0k
R12
78.7k
CLK
DATA
R13
68.1k
SMBALRT
U1
21
22
23
24
25
PVIN
PVIN
PVIN
PVIN
PVIN
29 _AVIN
35 _DIFFO
36 _FB
37 _COMP
39 _SYNC
40 _CNTL
27 _BP3
28 _BP6
30 _RESET/PGD
3 _ADDR0
2 _ADDR1
5 _{PMB_CLK}
4 _{PMB_DATA}
1 _RT
6 _{SMB_ALRT}
26 _DRGND
38 _AGND
TPS546C23
BOOT ⁷
SW
SW
SW
SW
SW
8
9
10
11
12
C11
R2
0.1µF ⁰
RSP ³³
RSN ³⁴
ISHARE ³¹
VSHARE ³²
C22
330pF
SW
TP4
SLC1480-301MLB
300 nH
L1
C13
1000pF
R7
1.0
GND
R8
49.9
R10
49.9
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
13
14
15
16
17
18
19
20
PAD ⁴¹
J1
1
2
ED120/2DS
VIN = 4.5 - 18 VDC
1
J2
2
ED120/2DS
C17
47µF
C18
47µF
C19
47µF
C20
47µF
VOUT
TP7
C15
470µF
Vout=0.35-5.5V/35A
J3
1
2
VOUT
C16
470µF
ED120/2DS
ED120/2DS
J4
1
2
GND
GND
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 39. Typical Application Schematic, TPS546C23
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: TPS546C23
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