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TPS62684 Datasheet(PDF) 18 Page - Texas Instruments

No. de Pieza. TPS62684
Descripción  1600-mA, High-Efficiency Step-Down Converter Optimized for Smallest Solution Size
Descarga  27 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS62684 Datasheet(HTML) 18 Page - Texas Instruments

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V = 5.0 V, V = 2.85V
I
O
400mA to 1600mA Load Step
100ns trise/tfall
V = 2.85V
O
No Load
4.5V to 5.5V Line Step
5us trise/tfall
VIN
SW
FB
GND
AVIN
EN
VOUT = 2.85 V
@ up to 1600mA peak
C
1.5 F
I
m
TPS62684
L
0.47 H
m
C
10 F
O
m
VBAT = 5.0V
TPS62684
SLVSAC5 – APRIL 2014
www.ti.com
10.2 Typical Application
Figure 26. Typical Application Circuit
10.2.1 Design Requirements
Figure 26 shows the schematic of the typical application. The TPS62684 allows the design of a power supply
with small solution size. In order to properly dissipate the heat, wide copper traces for the power connections
should be used to distribute the heat across the PCB. If possible, a GND plane should be used as it provides a
low impedance connection as well as serves as a heat sink. The EN pin should be set high after the supply
voltage has ramped to at least the minimum input voltage level of 3.25V.
10.2.2 Detailed Design Procedure
The TPS62684 allows the design of a complete power supply with only 3 small external components. A X5R or
X7R ceramic input capacitor close to the VIN pin and GND pin with a nominal value of 1.5uF or higher is
required. The input capacitance can be increased in case the source impedance is large or if there are high load
transients expected at the output. The inductor should be placed close to the SW node with a saturation current
above the current limit. A X5R or X7R ceramic output capacitor should be placed close to the inductor terminal
and GND. A low impedance GND connection on the output capacitor is required. The feedback (FB) pin should
be routed to the terminal of the output capacitor. The dc bias effect of the input and output capacitors must be
taken into account and the total capacitance on the output must not exceed the value given in the recommended
operating conditions.
10.2.3 Application Curves
Figure 27. Load Transient Response
Figure 28. Line Transient Response
18
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Product Folder Links: TPS62684


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