10

s/div

m

V

OUT

I

OUT

50mA

0mA

t =t =1

s

R

F

m

V

OUT =1.8V

1ms/div

V

OUT

V

IN

2.9V

2.3V

V

=1.8V

I

1mA

OUT

OUT =

SlewRate=1V/ s

m

14

TLV702-Q1

SLVSC35D – AUGUST 2013 – REVISED JULY 2019

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Product Folder Links: TLV702-Q1

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Copyright © 2013–2019, Texas Instruments Incorporated

8.2.2 Detailed Design Procedure

8.2.2.1 Input and Output Capacitor Requirements

1-μF X5R- and X7R-type ceramic capacitors are recommended because these capacitors have minimal variation

in value and equivalent series resistance (ESR) over temperature.

However, the TLV702-Q1 is designed to be stable with an effective capacitance of 0.1 μF or larger at the output.

Thus, the device is stable with capacitors of other dielectric types as well, as long as the effective capacitance

under operating bias voltage and temperature is greater than 0.1 μF. This effective capacitance refers to the

capacitance that the LDO sees under operating bias voltage and temperature conditions; that is, the capacitance

after taking both bias voltage and temperature derating into consideration. In addition to allowing the use of

lower-cost dielectrics, this capability of being stable with 0.1-μF effective capacitance also enables the use of

smaller footprint capacitors that have higher derating in size- and space-constrained applications.

Using a 0.1-μF rated capacitor at the output of the LDO does not ensure stability because the effective

capacitance under the specified operating conditions must not be less than 0.1 μF. Maximum ESR should be

less than 200 mΩ.

Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1-μF to 1-

μF, low ESR capacitor across the IN pin and GND pin of the regulator. This capacitor counteracts reactive input

sources and improves transient response, noise rejection, and ripple rejection. A higher-value capacitor may be

necessary if large, fast rise-time load transients are anticipated, or if the device is not located close to the power

source. If source impedance is more than 2 Ω, a 0.1-μF input capacitor may be necessary for stability.

8.2.2.2 Transient Response

As with any regulator, increasing the size of the output capacitor reduces overshoot and undershoot magnitude,

but increases the duration of the transient response.

8.2.3 Application Curves

Figure 25. Load Transient Response

Figure 26. Line Transient Response