TPS62080_15 Datasheet, PDF (11/27 Pages) Texas Instruments – TPS6208x 1.2-A High-Efficiency, Step-Down Converter With DCS-Control™ and Snooze Mode

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9 Application and Implementation
TPS62080, TPS62080A, TPS62081, TPS62082
SLVSAE8E – SEPTEMBER 2011 – REVISED APRIL 2015
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.
9.1 Application Information
The TPS62080 and TPS62080A are synchronous step-down converter whose output voltage is adjusted by
component selection. The following section discusses the design of the external components to complete the
power supply design for several input and output voltage options by using typical applications as a reference.
The TPS62081 and TPS62082 provide a fixed output volage which do not need an external resistor divider.
9.2 Typical Application
TPS62080
V_IN
2.3V .. 6V
VIN
10µF
EN
PG
1mH
SW
MODE
VOS
GND
FB
POWER GOOD
178k
V_OUT
22µF
R₁
R₂
Figure 7. Typical Application Schematic
9.2.1 Design Requirements
For this design example, use Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER
Input voltage
Output voltage
Output ripple voltage
Maximum output current
EXAMPLE VALUE
2.3 V to 6 V
1.2 V
< 20 mV
1.2 A
9.2.2 Detailed Design Procedure
Table 2 lists the components used for the example.
REFERENCE
C1
C2
L1
R1
R2
R3
Table 2. List of Components
DESCRIPTION
10 uF, Ceramic Capacitor, 6.3 V, X5R, size 0603
22 uF, Ceramic Capacitor, 6.3 V, X5R, size 0805,
GRM21BR60J226ME39L
1.0 µH, Power Inductor, 2.2 A, size 3 × 3 × 1.2 mm, XFL3012-
102MEB
Depending on the output voltage of TPS62080, 1%; Not populated
for TPS62081, TPS62082;
39.2k, Chip Resistor, 1/16W, 1%, size 0603
178k, Chip Resistor, 1/16W, 1%, size 0603
MANUFACTURER
Std
Murata
Coilcraft
Std
Std
Std
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