TC1306 Datasheet, PDF (5/16 Pages) Microchip Technology – Dual 150mA CMOS LDOWith Select Mode™ Operation, Shutdown and RESET Output

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
1µF from V_OUT to Ground is required. The output
capacitor should have an effective series resistance
(ESR) of 0.1Ω to 10Ω for a 1µF capacitor and 0.01Ω to
10Ω for a 10µF capacitor. A 1µF capacitor should be
connected from the V_IN 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 0.5µA (max). If shutdown mode is not
necessary, the pins should be connected to V_IN.
TC1306
4.3 Select Mode™ Operation
The Select Mode™ operation is a dual-state input that
allows the user to select V_OUT2 from two different
values. By applying a logic low to the SELECT pin,
V_OUT2 is set to supply a 2.8V output voltage. A logic
high signal at the SELECT pin sets V_OUT2 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 (t_WK) and Settling
Time (t_S).
The TC1306 has a fast Wake Up Time (10µsec typical)
when released from shutdown. See Figure 4-1 for the
Wake Up Time designated as t_WK. The Wake Up Time
is defined as the time it takes for the output to rise to 2%
of the V_OUT value after being released from shutdown.
The total turn on response is defined as the Settling
Time (t_S), see Figure 4-1. Settling Time (inclusive with
t_WK) is defined as the condition when the output is
within 2% of its fully enabled value (40µsec typical)
when released from shutdown. The settling time of the
output voltage is dependent on load conditions, output
voltage and V_OUT (RC response).
FIGURE 4-1:
WAKE-UP RESPONSE
TIME
V_IH
V_IL
SHDN
V_OUT
t_S
98%
2%
t_WK
© 2002 Microchip Technology Inc.
DS21527B-page 5