Introduction
2
SLUUC44 – July 2019
Copyright © 2019, Texas Instruments Incorporated
TPSM82810EVM Evaluation Module
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1
Introduction
The TPSM8281x device is a high-frequency, synchronous, step-down converter power module optimized
for a small solution size and high efficiency. The devices focus on high-efficiency, step-down conversion
over a wide output current range. When the MODE/SYNC pin is pulled low, the power module operates in
PWM mode at medium to heavy loads and automatically enters
Power Save Mode
operation at light loads
to maintain high efficiency over the entire load-current range. The internal compensation circuit allows a
compact solution and small external components. The power module is available in a 3.0-mm × 4.0-mm x
2.4-mm, uSilL package.
1.1
Performance Specification
provides a summary of the TPSM82810EVM-089 performance specifications.
Table 1. Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input voltage
2.75
6.0
V
Output voltage setpoint
1.8
V
Output current
TPSM82810EVM-089
0
4.0
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, the soft-start time can be changed, and the switching frequency can be modified.
1.2.1
Input and Output Capacitors
Footprints for an additional input capacitor (C3) as well as for additional output capacitors (C9, 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
Adjustable-frequency Step-down Converter with Integrated Inductor 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. See the
Voltage, Fixed Frequency Step-down Converter Module Data Sheet
for recommended values.
1.2.3
Feedforward Capacitor
C11 is the feedforward capacitor. If the feedback divider (R1 and R2) has been modified, you may have to
adjust the value of the feedforward capacitor as well. See the
TPSM82810 Low Input Voltage, Fixed
Frequency Step-down Converter Module Data Sheet
for the recommended values.
1.2.4
Soft-Start Time
C12 controls the soft-start time of the output voltage. It can be changed for a faster or slower ramp-up of
the output voltage. See the
TPSM82810 Low Input Voltage, Fixed Frequency Step-down Converter
for recommended capacitor values..