1 Introduction
This user's guide contains background information for the TPS54331 as well as support documentation for
the TPS54331EVM-232 evaluation module (HPA232). Also included are the performance specifications, the
schematic, and the bill of materials for the TPS54331EVM-232.
1.1 Background
The TPS54331 dc/dc converter is designed to provide up to a 3-A output from an input voltage source of 3.5
V to 28 V. Rated input voltage and output current range for the evaluation module are given in
This evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved
when designing with the TPS54331 regulator. The switching frequency is internally set at a nominal 570 kHz.
The high-side MOSFET is incorporated inside the TPS54331 package along with the gate drive circuitry. The
low drain-to-source on resistance of the MOSFET allows the TPS54331 to achieve high efficiencies and helps
keep the junction temperature low at high output currents. The compensation components are external to the
integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54331
provides adjustable slow start and undervoltage lockout inputs. The absolute maximum input voltage is 30 V for
the TPS54331EVM-232.
Table 1-1. Input Voltage and Output Current Summary
EVM
INPUT VOLTAGE RANGE
OUTPUT CURRENT RANGE
TPS54331EVM-232
VIN = 7 V to 28 V
0 A to 3 A
1.2 Performance Specification Summary
A summary of the TPS54331EVM-232 performance specifications is provided in
. Specifications are
given for an input voltage of VIN = 15 V and an output voltage of 3.3V, unless otherwise specified. The
TPS54331EVM-232 is designed and tested for VIN = 10 V to 35 V. The ambient temperature is 25°C for all
measurements, unless otherwise noted.
Table 1-2. TPS54331EVM-232 and Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIN voltage range
7
15
28
V
Output voltage set point
3.3
V
Output current range
V
IN
= 7 V to 28 V
0
3
A
Line regulation
I
O
= 1.5 A, VIN = 7 V – 28 V
±0.2%
Load regulation
VIN = 14 V, I
O
= 0 A to 3 A
±0.15%
Load transient response
I
O
= 0.75 A to 2.25 A
Voltage change
–100
mV
Recovery time
160
μs
I
O
= 2.25 A to 0.75 A
Voltage change
100
mV
Recovery time
160
μs
Loop bandwidth
VIN = 25 V, I
O
= 1 A
25.0
kHz
Phase margin
VIN = 25 V , I
O
= 1 A
58
°
Input ripple voltage
I
O
= 3 A
200
mVpp
Output ripple voltage
I
O
= 3 A
10
mVpp
Output rise time
3.5
ms
Operating frequency
570
kHz
Maximum efficiency
VIN = 10 V, V
O
= 5 V, I
O
= 0.75 A
91.6%
Introduction
2
TPS54331 Step-Down Converter Evaluation Module User's Guide
SLVU247A – JULY 2008 – REVISED OCTOBER 2021
Copyright © 2021 Texas Instruments Incorporated
