Texas Instruments TPS62840-1YBGEVM56, User Manual

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Introduction
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2 SLUUC17 – May 2019
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Copyright © 2019, Texas Instruments Incorporated
TPS62840-1YBGEVM56 User's Guide
1 Introduction
The TPS6284x is a family of synchronous, step-down converters in a 1.47-mm × 0.97-mm wafer chip-
scale package (WCSP) with 0.4-mm pitch. The BSR056 EVM contains 2 completely independent circuits,
each for a different IC version. See
Table 1 for a summary of the BSR056 EVMs.
The reference designator order is grouped together by sub-circuit. Reference designators beginning with
'1' (for example, R1x, J1x, C1x) are part of one sub-circuit. The second digit of each reference designator
is the same for the same component in different sub-circuits. R11 and R21, for example, refer to the same
resistor in each sub-circuit.
Table 1. BSR056 Circuit Options
EVM Version IC Installed Output Voltage Output Voltage Range Output Current
TPS62840-1YBGEVM56
(BSR056-001)
TPS62840 (U11) 1.8 V 1.8 - 3.3 V (selectable) 750 mA
TPS62841 (U21) 1.2 V 0.8 - 1.55 V (selectable) 750 mA
1.1 Performance Specification
Table 2 provides a summary of the TPS62840-1YBGEVM56 performance specifications.
Table 2. Performance Specification Summary
SPECIFICATION MIN TYP MAX UNIT
Input voltage 1.8 3.6 6.5 V
Output voltage See Table 1 V
Output current 0 See Table 1 mA
1.2 Modifications
The printed-circuit board (PCB) for this EVM uses the adjustable output voltage versions of this integrated
circuit (IC). Additional input and output capacitors can also be added. Finally, the loop response of the IC
can be measured.
1.2.1 Adjusting the Output Voltage
The output voltage is adjusted though the choice of Rx1 and Rx3 resistors. Since Rx1 and Rx3 are in
parallel, only Rx1 or Rx3 should be installed at the same time. Rx1 is an 0201 size to represent a typical
final solution. However, such a small size is difficult to manually replace. Therefore, Rx3 is provided in an
0603 size to easily change the output voltage. Simply remove Rx1 and install Rx3 in the desired value.
1.2.2 Input and Output Capacitors
Cx4 is provided for an additional input capacitor. This capacitor is not required for proper operation but
can be used to reduce the input voltage ripple.
Cx5, Cx6, and Cx7 are provided for additional output capacitors. These capacitors are not required for
proper operation but can be used to reduce the output voltage ripple and to improve the load transient
response. The total output capacitance must remain within the recommended range in the data sheet for
proper operation.