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TC1306 Datasheet(PDF) 5 Page - Microchip Technology

Part No. TC1306
Description  Dual 150mA CMOS LDO With Select Mode™ Operation, Shutdown and RESET Output
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1306 Datasheet(HTML) 5 Page - Microchip Technology

 
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© 2007 Microchip Technology Inc.
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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