Datasheet

OUT
V
R1 R2 1
1.229V
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= ´ -
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Background www.ti.com
1 Background
The TPS55330 DC/DC converter is a step-up boost converter. Rated input voltage and output current
range for the evaluation module are given in Table 1. This EVM demonstrates the performance of the
TPS55330 in an example application and accommodates evaluation of other boost applications supported
by the TPS55330. This design shows that a small printed-circuit-board area is possible when designing
with the TPS55330 regulator. However, appropriate sizing of the inductor and diode for the desired
application can further reduce the board area. The switching frequency is externally set at a nominal 600
kHz. The 24-V, 5-A, low-side MOSFET is incorporated inside the TPS55330 package along with the gate-
drive circuitry. The low drain-to-source on-resistance of the MOSFET achieves high efficiencies with the
TPS55330. The compensation components are external to the integrated circuit (IC). The absolute
maximum input voltage is 18 V for the EVM.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Maximum Output Current
TPS55330EVM-017 V
IN
= 2.9 V to 4.2 V I
OUT
max = 2.1 A
2 Performance Specification Summary
Table 2 provides a summary of the EVM performance specifications. Specifications are given for an input
voltage of V
IN
= 3.6 V with an output voltage of 5 V, unless otherwise specified. The ambient temperature
is 25°C for all measurements, unless otherwise noted.
Table 2. Performance Specification Summary
Specification Test Conditions Min Typ Max Unit
V
IN
voltage range 2.9 3.6 4.2 V
Output voltage set point 5 V
Line regulation I
OUT
= 2.1 A, V
IN
= 2.9 V to 4.2 V ±0.1%
Operating frequency 600 kHz
Output current range 0.001 2.1 A
Load regulation I
OUT
= 1 mA to 2.1 A ±0.1%
Voltage change –220 mV
I
OUT
= 525 mA to 1.575 A
Recovery time 400 µs
Load transient response
Voltage change 180 mV
I
OUT
= 1.575 A to 525 mA
Recovery time 400 µs
Loop bandwidth I
OUT
= 2.1 A 10 kHz
Phase margin I
OUT
= 2.1 A 76 °
Output ripple voltage I
OUT
= 2.1 A 20 mVpp
Maximum efficiency TPS55330EVM-017, V
IN
= 4.2 V, I
OUT
= 700 mA 92.5%
3 Modifications
These evaluation modules provide access to the features of the TPS55330. Some modifications to this
module are possible.
3.1 Output Voltage Set Point
The resistor divider network of R1 and R2 sets the output voltage. Keep R2 fixed at or close to 10 kΩ.
Change the output voltage of the EVM by changing the value of resistor R1. Calculate the value of R1 for
a specific output voltage by using Equation 1.
(1)
Note that V
IN
must be in a range so that the on-time is greater than the minimum controllable on-time (77
ns typical), and the maximum duty cycle is less than 89% minimum and 93% typical.
2
TPS55330EVM-017 2.9-V to 4.2-V Input, 5.0-V Output Boost Evaluation SLVU930–July 2013
Module
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