Datasheet
Background
1-2
1.1 Background
The TPS54314EVM evaluation module uses the TPS54314 synchronous
buck regulator to provide a 1.8-V output over an input range of 3 V to 6 V and
over a load range of 0 A to 3 A. The electrical components of the TPS54314
circuit consume less than 0.6 square inches of board space. Additional pads
are provided to support multiple input and output capacitors. A jumper is
provided to allow the switching frequency to be easily changed from 350 kHz
to 550 kHz.
The TPS54314 has two key features that reduce the number of additional
components compared to traditional synchronous buck controllers. The first
feature is that the MOSFETs are incorporated inside the TPS54314 package.
This eliminates the need for external MOSFETs and their associated drivers.
The second feature is that the compensation components that stabilize the
feedback loop are also incorporated inside the TPS54314 package.
Because the internal compensation of the TPS54314 is fixed, loop stability is
assured by the proper selection of an output inductor and output capacitor. For
guidelines on selecting an output inductor and output capacitor for a specific
application, refer to Texas Instruments application report, literature number
SLVA111, Designing With The TPS54311 Through TPS54316 Synchronous
Buck Regulators.
1.2 Performance Specification Summary
Table 1–1 provides a summary of the TPS54314EVM performance
specifications. All specifications are given for an ambient temperature of 25°C,
unless otherwise noted.
Table 1–1.Performance Specification Summary
Specification Test Conditions Min Typ Max Units
Input voltage range 3 5 6 V
Output voltage set point 1.8 V
Output current range 0 3 A
Load regulation V
I
= 5 V –7 7 mV
I 0Ato3A
–60 mV
PK
Load transient response
I
O
= 0 A to 3 A
30 µs
Load transient response
I 3Ato0A
70 mV
PK
I
O
= 3 A to 0 A
30 µs
Loop bandwidth V
I
= 5 V, I
O
= 3 A 70 kHz
Phase margin V
I
= 5 V, I
O
= 3 A 49 °
Input ripple voltage 150 mV
PP
Output ripple voltage 15 30 mV
PP
Output rise time 2.6 3.6 4.1 ms
Operating frequency 640 700 760 kHz
Efficiency V
I
= 5 V, I
O
= 1 A 91.5%