Datasheet

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1 Introduction
1.1 Background
The TPS54622 dc/dc converter is designed to provide up to a 6-A output. The TPS54622 implements
split-input power rails with separate input voltage inputs for the power stage and control circuitry. The
power stage input (PVIN) is rated for 1.6 V to 17 V whereas the control input (VIN) is rated for 4.5 V to 17
V. The TPS54622EVM-012 provides both inputs but is designed and tested using the PVIN connected to
VIN. 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 TPS54622 regulator. The switching frequency is externally set at a nominal
480 kHz. The high-side and low-side MOSFETs are incorporated inside the TPS54622 package along with
the gate drive circuitry. The low drain-to-source on resistance of the MOSFET allows the TPS54622 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 TPS54622 provides adjustable slow start, tracking, and
undervoltage lockout inputs. The absolute maximum input voltage is 20 V for the TPS54622EVM-012.
Table 1. Input Voltage and Output Current Summary
OUTPUT CURRENT
EVM INPUT VOLTAGE RANGE
RANGE
TPS54622EVM-012 VIN = 8 V to 17 V (VIN start voltage = 6.521 V) 0 A to 6 A
1.2 Performance Specification Summary
A summary of the TPS54622EVM-012 performance specifications is provided in Table 2. Specifications
are given for an input voltage of V
IN
= 12 V and an output voltage of 3.3 V, unless otherwise specified. The
TPS54622EVM-012 is designed and tested for V
IN
= 8 V to 17 V with the VIN and PVIN pins connect
together with the J5 jumper. The ambient temperature is 25°C for all measurements, unless otherwise
noted.
Table 2. TPS54622EVM-012 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
V
IN
voltage range (PVIN = VIN) 8 12 17 V
V
IN
start voltage 6.528 V
V
IN
stop voltage 6.19 V
Output voltage set point 3.3 V
Output current range V
IN
= 8 V to 17 V 0 6 A
Line regulation I
O
= 3 A, V
IN
= 8 V to 17 V ±0.02 %
Load regulation V
IN
= 12 V, I
O
= 0 A to 6 A ±0.013 %
Voltage change –150 mV
I
O
= 1.5 A to 4.5 A
Recovery time 200 µs
Load transient response
Voltage change 150 mV
I
O
= 4.5 A to 1.5 A
Recovery time 200 µs
Loop bandwidth V
IN
= 12 V, I
O
= 1.9 A 44.7 kHz
Phase margin V
IN
= 12 V , I
O
= 1.9 A 54 °
Input ripple voltage I
O
= 6 A 420 mVPP
Output ripple voltage I
O
= 6 A 18 mVPP
Output rise time 6 ms
Operating frequency 480 kHz
Maximum efficiency TPS54622EVM-012, V
IN
= 8 V, I
O
= 2 A 94.9 %
2
TPS54622EVM-012, 6-A, SWIFT™ Regulator— Evaluation Module SLVU441A– May 2011–Revised September 2011
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