Datasheet

1 Introduction
1.1 Background
1.2 Performance Specification Summary
Introduction www.ti.com
This user's guide contains background information for the TPS54140 as well as support documentation for
the TPS54140EVM-429 evaluation module (HPA429). Also included are the performance specifications,
the schematic, and the bill of materials for the TPS54140EVM-429.
The TPS54140 dc/dc converter is designed to provide up to a 1.5 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 may
be achieved when designing with the TPS54140 regulator. The switching frequency is externally set at a
nominal 500 kHz. The high-side MOSFET is incorporated inside the TPS54140 package along with the
gate drive circuitry. The low drain-to-source on resistance of the MOSFET allows the TPS54140 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 TPS54140 provides adjustable slow start and undervoltage
lockout inputs. The absolute maximum input voltage is 42 V for the TPS54140EVM-429.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS54140EVM-429 VIN = 25 V to 42 V 0 A to 1.5A
A summary of the TPS54140EVM-429 performance specifications is provided in Table 2 . Specifications
are given for an input voltage of V
IN
= 34 V and an output voltage of 3.3 V, unless otherwise specified.
The TPS54140EVM-429 is designed and tested for V
IN
= 25 V to 42 V. The ambient temperature is 25 ° C
for all measurements, unless otherwise noted.
Table 2. TPS54140EVM-429 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
V
IN
voltage range 25 34 42 V
Output voltage set point 3.3 V
Output current range V
IN
= 25 V to 42 V 0 1.5 A
Line regulation I
O
= 0.75 A, V
IN
= 25 V to 42 V ± 0.025%
Load regulation V
IN
= 34 V, I
O
= 0 A to 1.5 A ± 0.05%
Voltage change –55 mV
I
O
= 0.25 A to 1.25 A
Recovery time 1 ms
Load transient response
Voltage change 60 mV
I
O
= 1.25 A to 0.25 A
Recovery time 1 ms
Loop bandwidth V
IN
= 34 V, I
O
= 1.5 A 21 kHz
Phase margin V
IN
= 34 V , I
O
= 1.5 A 62 °
Input ripple voltage I
O
= 1.5 A 160 mV
PP
Output ripple voltage I
O
= 1.5A 5 mV
PP
Output rise time 4 ms
Operating frequency 500 kHz
Maximum efficiency TPS54140EVM-429, V
IN
= 25 V, I
O
= 0.6 A 86%
2 TPS54140EVM-429 1.5-A, SWIFT™ Regulator Evaluation Module SLVU285 – March 2009
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