CM1117F Datasheet, PDF (5/8 Pages) List of Unclassifed Manufacturers – 1A LOW DROPOUT VOLTAGE REGULATOR

CM1117F
1A LOW DROPOUT VOLTAGE REGULATOR
Application Hints
Like any linear voltage regulator, CM1117F requires
external capacitors to ensure stability. The external
capacitors must be carefully selected to ensure
performance.
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.
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded. The CM1117F 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]
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.
The thermal limit of the package is then limited to
P_D(MAX) = [T_J – T_A]/Θ_JA where T_J is the junction
temperature, TA is the ambient temperature, and Θ_JA is
around 60°C/W for CM1117F. CM1117F is designed
to enter thermal protection at 175°C. For example, if
T_A is 25°C then the maximum P_D is limited to about
2.5W. In other words, if I_OUT(MAX) = 1A, then [V_IN –
V_OUT] cannot exceed 2.5V.
2006/03/07 Rev1.0
Champion Microelectronic Corporation
Page 5