CM1117
1A L
OW
D
ROPOUT
V
OLTAGE
R
EGULATOR
Note 1:
Typical Values represent the most likely parametric norm.
Note 2:
All limits are guaranteed by testing or statistical analysis.
Note 3:
Load and line regulation are measured at constant junction room temperature.
Note 4:
The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input
voltage. It is measured when the output voltage has dropped 100mV from the nominal value obtained at V
IN
= V
OUT
+1.5V.
Note 5:
The minimum output current required to maintain regulation.
Note 6:
Minimum pad size of 0.038in
2
Application Hints
Like any linear voltage regulator, CM1117 requires
external capacitors to ensure stability. The external
capacitors must be carefully selected to ensure
performance.
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded.
The CM1117 has built-in thermal
protection. When the thermal limit is exceeded, the IC
will enter protection, and V
OUT
will be pulled to ground.
The power dissipation for a given application can be
calculated as following:
The power dissipation (P
D
) is
P
D
= I
OUT
* [V
IN
– V
OUT
]
Input Capacitor
An input capacitor of at least 10μF is required.
Ceramic or Tantalum can be used. The value can be
increase without upper limit.
Output Capacitor
An output capacitor is required for stability.
It must be
placed no more than 1 cm away from the V
OUT
pin, and
connected directly between V
OUT
and GND pins. The
minimum value is 22μF but may be increase without
limit.
2007/05/02 Rev1.9
Champion Microelectronic Corporation
Page 4
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
