Datasheet

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1 Introduction
The TPS54395 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 TPS54395 package along with the gate drive circuitry. The low,
drain-to-source on-resistance of the MOSFETs allows the TPS54395 to achieve high efficiencies and
helps keep the junction temperature low at high-output currents. The TPS54395 also features auto-skip
Eco-mode™ operation for improved light-load efficiency. The TPS54395 dual DC/DC synchronous
converter is designed to provide up to 3 A output on CH1 and 3 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 Table 1.
The TPS54395 EVM evaluation module is a dual, synchronous buck converter providing 3.3 V at 3 A on
CH1 and 1.5 V at 3 A on CH2 from 5 V to 18 V input. This user’s guide describes the TPS54395 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
TPS54395EVM Input Voltage Range Output Voltage Output Current Range
CH1 V
IN1
= 6 V to 18 V 3.3 V 0 A to 3 A
CH2 V
IN2
= 5 V to 18 V 1.5 V 0 A to 3 A
2 Performance Specification Summary
A summary of the TPS54395EVM performance specifications is provided in Table 2. 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. TPS54395EVM 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
Operating frequency V
IN1
, V
IN2
= 12 V, I
OUT1
, I
OUT2
= 1.5 A 700 kHz
CH1 0 3 A
Output
current range
CH2 0 3
I
OUT1
= 1.5 A, I
OUT2
= 0 A ,V
IN1
, V
IN2
= 6 +0.3 , - %
Line regulation, V
OUT1
V to 18 V 0.5
I
OUT1
= 1.5 A, I
OUT2
= 0 A ,V
IN1
, V
IN2
= 6 +0.2, - %
Line regulation, V
OUT2
V to 18 V 0.4
+0.5, -
Load regulation, V
OUT1
V
IN1
, V
IN2
= 12 V, I
OUT1
= 0 A to 3 A %
0.1
+0.55,
Load regulation, V
OUT2
V
IN1
, V
IN2
= 12 V, I
OUT2
= 0 A to 3 A %
-0.05
Over current limit, V
OUT1
V
IN1
= 12 V, L
1
= 2.2 µH 3.5 4.7 6.5 A
Over current limit, V
OUT2
V
IN2
= 12 V, L
1
= 2.2 µH 3.5 4.7 6.5 A
Output ripple voltage, V
OUT1
V
IN1
= 12 V, I
OUT1
= 3 A 20 mV
PP
Output ripple voltage, V
OUT2
V
IN2
= 12 V, I
OUT2
= 3 A 40 mV
PP
Maximum efficiency, V
OUT1
V
IN1
= 6 V, I
OUT1
= 0.7 A 94.8%
Maximum efficiency, V
OUT2
V
IN2
= 5 V, I
OUT2
= 0.7 A 90.5%
(1)
See Table 1
3
SLVU703–August 2012 TPS54395 Dual Channel SWIFT™ Evaluation Module
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