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
............................................................................................................................................................................................
BIAS AND BOOTSTRAP CAPACITORS
Every
TPS54073
design
requires
capacitor, C3, and a bias capacitor, C4. The
bootstrap capacitor must be a 0.1 F. The bootstrap
capacitor is located between the PH pins and BOOT.
The bias capacitor is connected between the VBIAS
pin and AGND. The value should be 1.0
capacitors should be high-quality ceramic types with
X7R or X5R grade dielectric for temperature stability.
They should be placed as close to the device
connection pins as possible.
POWER GOOD
The TPS54073 is provided with a power-good output
pin PWRGD. This output is an open-drain output and
is intended to be pulled up to a 3.3-V logic supply. A
10-kΩ pullup works well in this application. The
absolute maximum voltage is 6 V, so care must be
taken not to connect this pull up to Vin if the
maximum input voltage exceeds 6 V.
Figure 13. 1.5 V Power Supply With Ceramic Output Capacitors
14
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SNUBBER CIRCUIT
a
bootstrap
R8 and C14 of the application schematic comprise a
snubber circuit. The snubber is included to reduce
over-shoot and ringing on the phase node when the
internal high side FET turns on. Since the frequency
and amplitude of the ringing depends to a large
F. Both
degree on parasitic effects, it is best to choose these
component values based on actual measurements of
any design layout. See literature number
for more detailed information on snubber design
DESIGN WITH CERAMIC CAPACITORS
Figure 13
shows an application where all ceramic
capacitors, including the main output filter capacitor,
are used. The compensation network components
were calculated using SWIFT Designer Software. See
Figure 23
through
performance graphs, and switching waveforms for
this circuit.
Product Folder Link(s):
TPS54073
www.ti.com
SLUP100
Figure 26
for loop response,
Connect to Optional
Precharge Voltage
Copyright © 2005, Texas Instruments Incorporated