Texas Instruments TPS6291 EVM-161 Series User Manual

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User's Guide
TPS62913 Inverting Buck Boost EVM User Guide
The TPS6291xEVM-161 (BSR161) facilitates the evaluation of the TPS6291x 2-A and 3-A pin-to-pin compatible
Low Noise ( < 20 μV ) and Low Ripple ( < 10 μV
RMS
when used in an inverting buck-boost (IBB) topology. The BSR161-001 uses the 3-A TPS62913 to output a -5-V
output voltage from input voltages between 3 V and 11.5 V. Due to its extremely low noise, the TPS6291x is a
high-efficiency alternative to low-dropout (LDO) linear regulators in noise-sensitive circuits that need a negative
output voltage such as optical modules for telecom infrastructure, instrumentation and operational amplifiers for
medical, test and measurement, and aerospace and defense applications.
1 Introduction.............................................................................................................................................................................2
1.1 Performance Specification.................................................................................................................................................
1.2 EVM Features and Modifications.......................................................................................................................................
2 Setup........................................................................................................................................................................................6
2.1 Input/Output Connector Descriptions.................................................................................................................................
2.2 Ripple Measurement..........................................................................................................................................................
3 Test Results.............................................................................................................................................................................8
4 Board Layout.........................................................................................................................................................................
5 Schematic and Bill of Materials...........................................................................................................................................14
5.1 Schematic........................................................................................................................................................................
6 Bill of Materials.....................................................................................................................................................................
Figure 1-1. Output Current Limitations by Input Voltage and Output
Figure 1-2. Loop Response Measurement Modification (Bottom Layer).....................................................................................
Figure 1-3. Loop Response Measurement Modification (Top
Figure 2-1. Output Voltage Ripple, Measured at J4 (First LC
Figure 2-2. Output Voltage Ripple, Measured at J5 (After Ferrite
Figure 3-1. Efficiency for -5 V Output with 1MHz f
Figure 3-2. Startup with No
Figure 3-3. Startup with 1A Load.................................................................................................................................................
Figure 3-4. Shutdown with No Load............................................................................................................................................
Figure 3-5. Shutdown with 1A
Figure 3-6. Loop Response Measurement (V
Figure 4-1. Top Assembly..........................................................................................................................................................
Figure 4-2. Top Layer.................................................................................................................................................................11
Figure 4-3. Internal Layer 1 ......................................................................................................................................................
Figure 4-4. Internal Layer 2.......................................................................................................................................................
Figure 4-5. Bottom Layer ..........................................................................................................................................................
Figure 4-6. Bottom Layer (Mirrored)..........................................................................................................................................
Figure 5-1. TPS62913-IBB-EVM
Table 1-1. TPS62913EVM-161 Performance Specification
Table 6-1. TPS62913-IBB-EVM Bill of
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SLVUC22 - JULY 2021
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Table of Contents

List of Figures
.................................................................................................................
SW
Load.................................................................................................................................................8
Load...........................................................................................................................................10
= 5 V, V
IN OUT
Schematic..............................................................................................................................14
List of Tables
Materials........................................................................................................................15
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ABSTRACT
) buck converters in small 2-mm by 2-mm QFN packages
RMS
Voltage..............................................................................3
Layer)...........................................................................................5
Filter)............................................................................................7
Bead).....................................................................................7
= -5 V, I = 1000 mA, Ferrite Bead
OUT
Summary.........................................................................................2
TPS62913 Inverting Buck Boost EVM User Guide
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