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1 Introduction
This user's guide contains background information for the TPS5401 as well as support documentation for
the TPS5401EVM-708 evaluation module (HPA708). Also included are the performance specifications, the
schematic, and the bill of materials for the TPS5401EVM-708.
1.1 Background
The TPS5401 dc/dc converter is designed to provide up to a 0.5-A output from an input voltage source of
3.5 V to 42 V. Rated input voltage and output current range for the evaluation module are given in
Table 1. This evaluation module is designed to demonstrate the small printed-circuit-board areas that can
be achieved when designing with the TPS5401 regulator. The switching frequency is internally set at a
nominal 700 kHz. The high-side MOSFET is incorporated inside the TPS5401 package along with the
gate drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS5401 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 TPS5401 provides adjustable slow start and undervoltage lockout inputs.
The absolute maximum input voltage is 42 V for the TPS5401EVM-708.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS5401EVM-708 VIN = 7.5 V to 35 V 0 A to 0.5 A
1.2 Performance Specification Summary
A summary of the TPS5401EVM-708 performance specifications is provided in
Table 2. Specifications are given for an input voltage of V
IN
= 24 V and an
output voltage of 5 V, unless otherwise specified. The TPS5401EVM-708 is
designed and tested for V
IN
= 7.5 V to 35 V. The ambient temperature is 25°C
for all measurements, unless otherwise noted.
Table 2. TPS5401EVM-708 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
V
IN
voltage range 7.5 24 35 V
Output voltage set point 5 V
Output current range V
IN
= 7.5 V to 35 V 0 0.5 A
Line regulation I
O
= 0.25 A, V
IN
= 7.5 V to 35 V ±0.06%
Load regulation V
IN
= 24 V, I
O
= 0.001 A to 0.5 A ±0.07%
Voltage change –35 mV
I
O
= 0.125 A to 0.375 A
Recovery time 2 ms
Load transient response
Voltage change 35 mV
I
O
= 0.375 A to 0.125 A
Recovery time 2 ms
Loop bandwidth V
IN
= 24 V, I
O
= 0.5 A 15 kHz
Phase margin V
IN
= 24 V , I
O
= 0.5 A 74 °
Input ripple voltage I
O
= 0.5 A 80 mV
PP
Output ripple voltage I
O
= 0.5 A 5 mV
PP
Output rise time 4 ms
Operating frequency 700 kHz
Maximum efficiency TPS5401EVM-708, V
IN
= 12 V, I
O
= 0.3 A 92%
SWIFT, Eco-mode are trademarks of Texas Instruments.
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TPS5401EVM-708 0.5-A, SWIFT™ Regulator Evaluation Module SLVU430–January 2011
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