2002 Microchip Technology Inc.
DS21437B-page 5
TC57
3.4
Input Capacitor
The addition of an input capacitor further reduces
output noise, and negates the effects of power supply
input impedance. A 10礔 (min) Tantalum capacitor is
recommended.
3.5
Shutdown Mode
The TC57 enters a low power shutdown mode when
the shutdown input (SHDN) is high. During shutdown,
the regulator is disabled, the output capacitor is
discharged through the load, and supply current to the
TC57 decreases to less than 1礎. Normal operation
resumes when SHDN is brought low. If the shutdown
mode is not used, SHDN should be tied to V
IN
.
TABLE 3-1:
COMPONENT SUPPLIERS
Device
Mounting
Method
Manufacturer
Website
CAPACITORS
267 Series
Surface Mount
Matsuo
http://www.matsuoelectronics.com
F95 Tantalum Series
Surface Mount
Nichicon
http://www.nichicon-us.com
595 Tantalum Series
Surface Mount
Sprague
http://www.vishay.com/brands/sprague
OS-CON Series
Through-Hole
Sanyo
http://www.sanyovideo.com
LXF Series
Through-Hole
United Chemi-Con
http://chemi-con.com
TRANSISTORS
ZTX749
Through-Hole
Zetex
http://www.zetex.com
2N4403
Through-Hole
ON SEMI
http://www.onsemi.com/home
2N2907A
Through-Hole
ON SEMI
http://www.onsemi.com/home
FZT749
Surface Mount
Zetex
http://www.zetex.com
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