TC1016_13 datasheet(10/22 Pages) MICROCHIP

10 / 22 page

TC1016

DS21666B-page 10

4.1

Input Capacitor

Low input source impedance is necessary for the LDO

to operate properly. When operating from batteries, or

in applications with long lead length (> 10") between

the input source and the LDO, some input capacitance

is required. A minimum of 0.1 µF is recommended for

most applications and the capacitor should be placed

as close to the input of the LDO as is practical. Larger

input capacitors will help reduce the input impedance

and further reduce any high-frequency noise on the

input and output of the LDO.

4.2

Output Capacitor

A minimum output capacitance of 1 µF for the TC1016

is required for stability. The ESR requirements on the

output capacitor are between 0 and 2 ohms. The output

capacitor should be located as close to the LDO output

as is practical. Ceramic materials X7R and X5R have

low temperature coefficients and are well within the

acceptable ESR range required. A typical 1 µF X5R

0805 capacitor has an ESR of 50 milli-ohms. Larger

output capacitors can be used with the TC1016 to

improve dynamic behavior and input ripple rejection

performance.

Ceramic, aluminum electrolytic or tantalum capacitor

types can be used. Since many aluminum electrolytic

capacitors freeze at approximately –30

°C, ceramic or

solid tantalums are recommended for applications

operating below –25

°C. When operating from sources

other than batteries, supply noise rejection and tran-

sient response can be improved by increasing the

value of the input and output capacitors, and by

employing passive filtering techniques.

4.3

Turn-On Response

The turn on response is defined as two separate

response categories, Wake-up Time (tWK) and Settling

Time (tS).

The TC1016 has a fast tWK (10 µsec, typ.) when

released from shutdown. Figure 4-3 provides the

TC1016’s tWK. The tWK is defined as the time it takes

for the output to rise to 2% of the VOUT value after being

released from shutdown.

The total turn-on response is defined as the t

S (see

Figure 4-3). The t

S (inclusive with t

WK) is defined as the

condition when the output is within 98% of its fully

enabled value (42 µsec, typ.) when released from shut-

down. The settling time of the output voltage is

dependent on load conditions and output capacitance

on VOUT (RC response).

Table 4-1 demonstrates the typical turn-on response

timing for different input voltage power-up frequencies:

VOUT = 2.8V, VIN = 5.0V, IOUT = 60 mA and COUT = 1 µF.

TABLE 4-1:

TYPICAL TURN-ON

RESPONSE TIMING

FIGURE 4-3:

Wake-Up Time from Shutdown.

Frequency

Typical (tWK)

Typical (tS)

1000 Hz

5.3 µsec

14 µsec

500 Hz

5.9 µsec

16 µsec

100 Hz

9.8 µsec

32 µsec

50 Hz

14.5 µsec

52 µsec

10 Hz

17.2 µsec

77 µsec

OUT

98%

SHDN

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