Datasheet

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1 Introduction
The TPS54294 is a dual, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a 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 of 700 kHz. The high-side and
low-side switching MOSFETs are incorporated inside the TPS54294 package along with the gate drive
circuitry. The low, drain-to-source on-resistance of the MOSFETs allows the TPS54294 to achieve high
efficiencies and helps keep the junction temperature low at high-output currents. The TPS54294 also
features auto-skip Eco-mode™ operation for improved light-load efficiency. The TPS54294 dual DC/DC
synchronous converter is designed to provide up to 2 times 2 A output from an input voltage source of 4.5
V to 18 V. The output voltage range is from 0.76 V to 7 V. Rated input voltage and output current range
for the evaluation module are given in Table 1.
The TPS54294EVM evaluation module is a dual, synchronous buck converter providing 1.2 V and 3.3 V at
2 A from 4.5 V to 18 V input. This user’s guide describes the TPS54294EVM performance.
NOTE: Throughout the document, x means 1 or 2, e.g., VFBx means VFB1 or VFB2.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Output Current Range for both outputs
TPS54294EVM V
INx
= 4.5 V to 18 V 0 A to 2 A
2 Performance Specification Summary
A summary of the TPS54294EVM performance specifications is provided in Table 2. Specifications are
given for an input voltage of V
INx
= 12 V and an output voltage of 1.2 V and 3.3 V, unless otherwise noted.
The ambient temperature is 25°C for all measurement, unless otherwise noted.
Table 2. TPS54294EVM Performance Specifications Summary
Specifications Test Conditions Min Typ Max Unit
Input voltage range (V
INx
) 4.5 12 18 V
V
OUT1
1.2
Output
V
voltages
V
OUT2
3.3
Operating frequency V
INx
= 12 V, I
OUTx
= 1 A 700 kHz
Output current range 0 2 A
Line regulation, V
OUT1
I
OUTx
= 1 A, V
INx
= 4.5 V to 18 V 0.040 %/V
Line regulation, V
OUT2
I
OUTx
= 1 A, V
INx
= 5 V to 18 V 0.049 %/V
Load regulation, V
OUT1
V
INx
= 12 V, I
OUTx
= 0 A to 2 A 0.375 %/A
Load regulation, V
OUT2
V
INx
= 12 V, I
OUTx
= 0 A to 2 A 0.167 %/A
Over current limit, V
OUTx
V
INx
= 12 V, L
x
= 2.2 µH 4 A
Output ripple voltage, V
OUTx
V
INx
= 12 V, I
OUTx
= 2 A 15 mV
PP
Maximum efficiency, V
OUT1
V
INx
= 5 V, I
OUTx
= 0.4 A 88.1%
Maximum efficiency, V
OUT2
V
INx
= 5 V, I
OUTx
= 0.3 A 95.1%
3
SLVU491–November 2011 TPS54294 Dual Channel SWIFT™ Evaluation Module
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