Texas Instruments TPS54494 Evaluation Module TPS54494EVM-057 TPS54494EVM-057 Data Sheet
Product codes
TPS54494EVM-057
Introduction
1
Introduction
The TPS54494 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 TPS54494 package along with the gate drive circuitry. The low,
drain-to-source on-resistance of the MOSFETs allows the TPS54494 to achieve high efficiencies and
helps keep the junction temperature low at high-output currents. The TPS54494 also features auto-skip
Eco-mode™ operation for improved light-load efficiency. The TPS54494 dual DC/DC synchronous
converter is designed to provide up to 4 A output on CH1 and 2 A output on CH2 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
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 TPS54494 package along with the gate drive circuitry. The low,
drain-to-source on-resistance of the MOSFETs allows the TPS54494 to achieve high efficiencies and
helps keep the junction temperature low at high-output currents. The TPS54494 also features auto-skip
Eco-mode™ operation for improved light-load efficiency. The TPS54494 dual DC/DC synchronous
converter is designed to provide up to 4 A output on CH1 and 2 A output on CH2 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
.
The TPS54494EVM evaluation module is a dual, synchronous buck converter providing 3.3 V at 4 A on
CH1 and 1.5 V at 2 A on CH2. This user’s guide describes the TPS54494 EVM performance.
CH1 and 1.5 V at 2 A on CH2. This user’s guide describes the TPS54494 EVM performance.
NOTE:
Throughout the document, x means 1 or 2, for example, VFBx means VFB1 or VFB2.
Table 1. Input Voltage, Output Voltage and Output Current Summary
TPS54494EVM
Input Voltage Range
Output Voltage
Output Current Range
CH1
V
IN1
= 6 V to 18 V
3.3 V
0 A to 4 A
CH2
V
IN2
= 5 V to 18 V
1.5 V
0 A to 2 A
2
Performance Specification Summary
A summary of the TPS54494 EVM performance specifications is provided in
. Specifications are
given for an input voltage of V
INx
= 12 V and an output voltage of 3.3 V and 1.5 V, unless otherwise noted.
The ambient temperature is 25°C for all measurement, unless otherwise noted.
Table 2. TPS54494 EVM Performance Specifications Summary
Specifications
Test Conditions
Min
Typ
Max
Unit
Input voltage range (V
INx
)
(1)
12
18
V
V
OUT1
3.3
Output
V
voltages
V
OUT2
1.5
V
IN1
, V
IN2
= 12 V, I
OUT1
= 2 A, I
OUT2
= 1
700
kHz
Operating frequency
A
CH1
0
4
A
Output
current range
current range
CH2
0
2
I
OUT1
= 2 A, I
OUT2
= 0 A, V
IN1
, V
IN2
= 6 V
+0.25 ,
%
Line regulation, V
OUT1
to 18 V
-0.52
I
OUT2
= 1 A, I
OUT1
= 0 A, V
IN1
, V
IN2
= 5 V
+0.2, -
%
Line regulation, V
OUT2
to 18 V
0.4
+0.65,
Load regulation, V
OUT1
V
IN1
, V
IN2
= 12 V, I
OUT1
= 0 A to 4 A
%
-0.1
+0.6, -
Load regulation, V
OUT2
V
IN1
, V
IN2
= 12 V, I
OUT2
= 0 A to 2 A
%
0.05
Over current limit, V
OUT1
V
IN1
= 12 V, L
1
= 2.2 µH
4.5
5.7
7.0
A
Over current limit, V
OUT2
V
IN2
= 12 V, L
1
= 1.5 µH
2.8
3.9
5.0
A
Output ripple voltage, V
OUT1
V
IN1
= 12 V, I
OUTx
= 4 A
15
mV
PP
Output ripple voltage, V
OUT2
V
IN2
= 12 V, I
OUTx
= 2 A
25
mV
PP
Maximum efficiency, V
OUT1
V
IN1
= 5 V, I
OUTx
= 0.7 A
94.9%
Maximum efficiency, V
OUT2
V
IN2
= 5 V, I
OUTx
= 0.7 A
90.1%
(1)
See
3
SLVU677 – August 2012
TPS54494 Dual Channel SWIFT™ Evaluation Module
Copyright © 2012, Texas Instruments Incorporated