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1 Introduction
This user’s guide contains background information for the TPS54226 as well as support documentation for the
TPS54226EVM-539 evaluation module. Also included are the performance specifications, schematic, and the bill
of materials for the TPS54226EVM-539.
1.1 Background
The TPS54226 is a single, adaptive on-time D-CAP2
™
mode synchronous buck converter requiring a very
low external component count. The D-CAP2 control circuit is optimized for low-ESR output capacitors such as
POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The
switching frequency is internally set at a nominal 700 kHz. The high-side and low-side switching MOSFETs
are incorporated inside the TPS54226 package along with the gate drive circuitry. The low drain-to-source
on resistance of the MOSFETs allow the TPS54226 to achieve high efficiencies and helps keep the junction
temperature low at high output currents. The TPS54226 also has an auto-skip mode to enable higher efficiency
at light loads. The TPS54226 DC/DC synchronous converter is designed to provide up to a 2-A output from an
input control voltage source of 4.5 V to 18 V and an input power voltage source of 2 V to 18 V. The output
voltage range is from 0.76-V to 5.5-V voltage. The output current range for the evaluation module are given in
Table 1-1. Input Voltage and Output Current Summary
EVM
INPUT VOLTAGE RANGE
OUTPUT VOLTAGE AND CURRENT
RANGE
TPS54226EVM-539
VIN = 4.5 V to 18 V
VOUT = 1.05 V, 0 A to 2 A
1.2 Performance Specification Summary
A summary of the TPS54226EVM-539 performance specifications is provided in
. Specifications are
given for an input voltage of VIN = 12V and an output voltage of 1.05V, unless otherwise noted. The ambient
temperature is 25°C for all measurement, unless otherwise noted.
Table 1-2. TPS54226 EVM and Performance Specifications Summary
SPECIFICATIONS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input voltage range (VIN)
4.5
12
18
V
CH1
Output voltage
1.05
V
Operating frequency
VIN = 12 V, I
O
= 1 A
700
kHz
Output current range
0
2
A
Over current limit
VIN = 12 V
3.1
A
Output ripple voltage
VIN = 12 V, I
O
= 2 A
7
mV
PP
1.3 Modifications
These evaluation modules are designed to provide access to the features of the TPS54226. Some modifications
can be made to this module.
1.3.1 Output Voltage Set Point
To change the output voltage of the EVMs, change the value of resistor R1. Changing the value of R1 can
change the output voltage above 0.765 V. The value of R1 for a specific output voltage can be calculated using
For output voltage from 0.76 V to 2.5 V:
O
R1
V
= 0.765
1+
R2
æ
ö
´ ç
÷
è
ø
(1)
For output voltage over 2.5 V:
Introduction
2
TPS54226 Step-Down Converter Evaluation Module User's Guide
SLVU336A – NOVEMBER 2009 – REVISED OCTOBER 2021
Copyright © 2021 Texas Instruments Incorporated
