Output Load Transient Slew Rate (A/Ps)

0.01

0.1

1

0

5

10

15

20

25

30

35

D027

1-PF COUT

COUT Removed

16

TLV733P

SBVS235C – OCTOBER 2014 – REVISED JULY 2019

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

8.1.1 Input and Output Capacitor Selection

The TLV733 uses an advanced internal control loop to obtain stable operation both with and without the use of

input or output capacitors. Dynamic performance is improved with the use of an output capacitor, and may be

improved with an input capacitor. An output capacitance of 0.1 μF or larger generally provides good dynamic

response. Use X5R- and X7R-type ceramic capacitors because these capacitors have minimal variation in value

and equivalent series resistance (ESR) over temperature.

Although an input capacitor is not required for stability, increased output impedance from the input supply may

compromise the performance of the TLV733. Good analog design practice is to connect a 0.1-µF to 1-µF

capacitor from IN to GND. This capacitor counteracts reactive input sources and improves transient response,

input ripple, and PSRR. Use an input capacitor if the source impedance is greater than 0.5 Ω. Use a higher-value

capacitor if large, fast, rise-time load transients are anticipated, or if the device is located several inches from the

input power source.

Figure 33 shows the transient performance improvements with an external 1-µF capacitor on the output versus

no output capacitor. The data in this figure are taken with an increasing load step from 50 mA to 300 mA, and the

peak output voltage deviation (load transient response) is measured. For low output current slew rates,

(< 0.1 A/µs), the transient performance of the device is similar with or without an output capacitor. As the current

slew rate is increased, the peak voltage deviation is significantly increased. For loads that exhibit fast current

slew rates above 0.1 A/µs, use an output capacitor. For best performance, the maximum recommended output

capacitance is 100 µF.

TLV73333PDBV, output current stepped from 50 mA to 300 mA, output voltage change measured at positive dI/dt

Figure 33. Output Voltage Deviation vs Load Step Slew Rate

Some applications benefit from the removal of the output capacitor. In addition to space and cost savings, the

removal of the output capacitor lowers inrush current as a result of eliminating the required current flow into the

output capacitor upon startup. In these cases, take care to ensure that the load is tolerant of the additional output

voltage deviations.