Datasheet
VIN
SW
FB
MODE
GND
EN
C
I
TPS8267XSIP
L
V
IN
C
O
MODE
SELECTION
ENABLE
DC/DC Converter
GND
V
OUT
TPS82670
,
TPS82671
,
TPS82672
,
TPS82673
,
TPS82674
,
TPS82675
TPS82676
,
TPS82677
,
TPS826711
,
TPS826721
,
TPS826745
,
TPS826765
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SLVSAI0H –OCTOBER 2010–REVISED OCTOBER 2014
10 Applications and Implementation
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.
10.1 Application Information
The TPS8267x devices are complete power supply modules, not needing further external devices. The devices
are optimized to work best with the components populated. However application conditions might demand for
different input and/or output capacitance values.
10.2 Typical Application
Figure 10. MicroSIP Converter Module Schematic
10.2.1 Design Requirements
For applications requiring additional input and/or output capacitance, the following procedures should be
considered. For the maximum recommended values see Recommended Operating Conditions.
10.2.2 Detailed Design Procedure
10.2.2.1 Input Capacitor Selection
Because of the pulsating input current nature of the buck converter, a low ESR input capacitor is required to
prevent large voltage transients that can cause misbehavior of the device or interference in other circuits in the
system.
For most applications, the input capacitor that is integrated into the TPS8267x should be sufficient. If the
application exhibits a noisy or erratic switching frequency, experiment with additional input ceramic capacitance
to find a remedy.
The TPS8267x uses a tiny ceramic input capacitor. When a ceramic capacitor is combined with trace or cable
inductance, such as from a wall adapter, a load step at the output can induce ringing at the VIN pin. This ringing
can couple to the output and be mistaken as loop instability or can even damage the part. In this circumstance,
additional "bulk" capacitance, such as electrolytic or tantalum, should be placed between the input of the
converter and the power source lead to reduce ringing that can occur between the inductance of the power
source leads and C
I
.
10.2.2.2 Output Capacitor Selection
The advanced, fast-response, voltage mode, control scheme of the TPS8267x allows the use of a tiny ceramic
output capacitor (C
O
). For most applications, the output capacitor integrated in the TPS8267x is sufficient.
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TPS826711 TPS826721 TPS826745 TPS826765