TC1306_07 datasheet(5/18 Pages) MICROCHIP

No de pièce	TC1306

Description	Dual 150mA CMOS LDO With Select Mode??Operation, Shutdown and RESET Output

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DS21527C-page 5

TC1306

4.0

TYPICAL APPLICATIONS

4.1

Input and Output Capacitor

The TC1306 is stable with a wide range of capacitor

values and types. A capacitor with a minimum value of

1

μF from VOUT to Ground is required. The output

capacitor should have an effective series resistance

(ESR) of 0.1

Ω to 10Ω for a 1μF capacitor and 0.01Ω to

10

Ω for a 10μF capacitor. A 1μF capacitor should be

connected from the VIN to GND if there is more than 10

inches of wire between the regulator and the AC filter

capacitor, or if a battery is used as the power source.

Aluminum electrolytic or tantalum capacitor types can

be used. (Since many aluminum electrolytic capacitors

freeze at approximately -30°C, solid tantalums are

recommended for applications operating below -20°C).

When operating from sources other than batteries,

supply-noise rejection and transient response can be

improved by increasing the value of the input and

output capacitors and employing passive filtering

techniques.

4.2

Shutdown Mode

Applying a logic high to each of the shutdown pins turns

on the corresponding output. Each regulator enters

shutdown mode when a logic low is applied to the

corresponding input. During shutdown mode, output

voltage falls to zero, and regulator supply current is

reduced to 0.5

μA (max). If shutdown mode is not

necessary, the pins should be connected to VIN.

4.3

Select Mode™ Operation

The Select Mode™ operation is a dual-state input that

allows the user to select VOUT2 from two different

values. By applying a logic low to the SELECT pin,

VOUT2 is set to supply a 2.8V output voltage. A logic

high signal at the SELECT pin sets VOUT2 to 3.0V. This

output voltage functionality provides high design

flexibility and minimizes cost associated with inventory,

time-to-market and new device qualifications.

4.4

Turn On Response

The turn on response is defined as two separate

response categories, Wake Up Time (tWK) and Settling

Time (tS).

The TC1306 has a fast Wake Up Time (10

μsec typical)

when released from shutdown. See Figure 4-1 for the

Wake Up Time designated as tWK. The Wake Up Time

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 Settling

Time (tS), see Figure 4-1. Settling Time (inclusive with

tWK) is defined as the condition when the output is

within 2% of its fully enabled value (40

μsec typical)

when released from shutdown. The settling time of the

output voltage is dependent on load conditions, output

voltage and VOUT (RC response).

FIGURE 4-1:

WAKE-UP RESPONSE

TIME

tS

tWK

98%

2%

SHDN

VIL

VOUT

VIH

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