As a member of the SWIFT™ family of dc/dc regulators, the TPS54073 low-input voltage high-output current synchronous buck PWM converter integrates all required active components

TPS54073

Manufacturer Part NumberTPS54073
DescriptionAs a member of the SWIFT™ family of dc/dc regulators, the TPS54073 low-input voltage high-output current synchronous buck PWM converter integrates all required active components
ManufacturerTexas Instruments
TPS54073 datasheet
 


Specifications of TPS54073

Iout(max)(a)14Vin(min)(v)2.2
Vin(max)(v)4Vout(min)(v)0.9
Vout(max)(v)2.5Iq(typ)(ma)13
Switching Frequency(max)(khz)700Switch Current Limit(typ)(a)14.5
TopologyBuckOperating Temperature Range(c)-40 to 85
Pin/package28HTSSOPDuty Cycle(max)(%)90
Regulated Outputs(#)1  
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TPS54073
SLVS547 – FEBRUARY 2005
............................................................................................................................................................................................
PCB LAYOUT
COMPENSATION
NETWORK
VOUT
OUTPUT INDUCTOR
OUTPUT
FILTER
CAPACITOR
The PVIN pins are connected together on the printed-
circuit board (PCB) and bypassed with a low ESR
ceramic bypass capacitor. Care should be taken to
minimize the loop area formed by the bypass
capacitor connections, the PVIN pins, and the
TPS54073 ground pins. The minimum recommended
bypass capacitance is a 10- F ceramic capacitor with
a X5R or X7R dielectric. The optimum placement is
as close as possible to the PVIN pins, the AGND,
and PGND pins. See
Figure 10
for an example of a
board layout. If the VIN is connected to a separate
source supply, it is bypassed with its own capacitor.
There is an area of ground on the top layer of the
PCB, directly under the IC, with an exposed area for
connection to the PowerPAD. Use vias to connect
this ground area to any internal ground planes. Use
8
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APPLICATION INFORMATION
OPTIONAL PRE-CHARGE DIODES
ANALOG GROUND TRACE
AGND
VSENSE
SYNC
COMP
SS/ENA
PWRGD
VBIAS
BOOT
BOOT
CAPACITOR
EXPOSED
PH
POWERPAD
AREA
PH
PH
PH
PH
PGND
PH
PGND
PH
PGND
PH
PGND
PH
PGND
PH
TOPSIDE GROUND AREA
Figure 10. TPS54073 Layout
additional vias at the ground side of the input and
output filter capacitors. The AGND and PGND pins
are tied to the PCB ground by connecting them to the
ground area under the device as shown in
Use a separate wide trace for the analog ground
signal path. This analog ground is used for the
voltage set point divider, timing resistor RT, slow-start
capacitor, and bias capacitor grounds. The PH pins
are tied together and routed to the output inductor.
Because the PH connection is the switching node, an
inductor is located close to the PH pins, and the area
of the PCB conductor is minimized to prevent
excessive capacitive coupling. Connect the boot
capacitor between the phase node and the BOOT pin
as shown in
to the IC, and minimize the conductor trace lengths.
Product Folder Link(s):
TPS54073
www.ti.com
CONNECT TO PRE-CHARGE
VOLTAGE SOURCE
FREQUENCY SET RESISTOR
RT
SLOW START
INPUT
CAPACITOR
BYPASS
CAPACITOR
BIAS CAPACITOR
VIN
VIN
PVIN
PVIN
PVIN
PVIN
PVIN
INPUT
INPUT
BYPASS
BULK
CAPACITOR
FILTER
VIA to Ground Plane
Figure
Figure
10. Keep the boot capacitor close
Copyright © 2005, Texas Instruments Incorporated
10.