Texas Instruments TPS62851 EVM-139 Series, Руководство пользователя, Страница: 2 / 16

1 Introduction
The TPS62851x device is a synchronous, step-down converter optimized for a small solution size and high
efficiency. The devices focus on high-efficiency, step-down conversion over a different output current range. The
internal compensation circuit allows a compact solution and small external components. The device is available
in a 2.1-mm × 1.6-mm (including pins) in SOT583 package.
1.1 Performance Specifications
Table 1-1 provides a summary of the TPS62851xEVM-139 performance specifications.
Table 1-1. Performance Specifications Summary
SPECIFICATIONS TEST CONDITIONS MIN TYP MAX UNIT
Input voltage 2.7 6.0 V
Output voltage setpoint 1.8 V
Output current TPS628510EVM-139
0 0.5 A
TPS628511EVM-139 0 1.0 A
TPS628512EVM-139 0 2.0 A
1.2 Modifications
The printed-circuit board (PCB) for this EVM is designed to accommodate the different adjustable output voltage
versions of this integrated circuit (IC). On the EVM, additional input and output capacitors can be added and the
soft-start time can be modified.
1.2.1 Input and Output Capacitors
Footprints for an additional input capacitor (C11) and output capacitors (C9 and C10) are provided. These
capacitors are not required for proper operation but can be used to reduce the input and output voltage ripple
and to improve the load transient response. For proper operation, the total output capacitance must remain
within the recommended range described in the
TPS62851x 2.7-V to 6-V Adjustable-Frequency Step-Down
Converter in SOT583 Package Data Sheet .
1.2.2 Adjustable-Output IC U1 Operation
U1 is configured for evaluation of the adjustable-output version. This unit is set to 1.8 V. Resistors R1 and R2
can be used to set the output voltage between 0.6 V and 5.5 V. For recommended values, see the
TPS62851x
2.7-V to 6-V Adjustable-Frequency Step-Down Converter in SOT583 Package Data Sheet .
1.2.3 Feedforward Capacitor
C8 is the feedforward capacitor. For recommended values, see the TPS62851x 2.7-V to 6-V Adjustable-
Frequency Step-Down Converter in SOT583 Package Data Sheet .
1.2.4 Soft-Start Time
C16 controls the soft-start time of the converter. It can be changed for a faster or slower ramp up of
output voltage. For recommended values, see the
TPS62851x 2.7-V to 6-V Adjustable-Frequency Step-Down
Converter in SOT583 Package Data Sheet .
Introduction www.ti.com
2 TPS62851xEVM-139 Evaluation Module SLVUBY6A – AUGUST 2020 – REVISED JUNE 2021
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