ACE1117_12 Datasheet, PDF (4/8 Pages) ACE Technology Co., LTD. – 1A Positive Voltage Regulators

ACE1117
1A Positive Voltage Regulators
Input Capacitor
An input capacitor of 10μF is recommended. Ceramic or Tantalum can be used. The value can be
increased without upper limit.
Output Capacitor
An output capacitor of 22uF is recommended for better transient and PSRR performance. It should be
placed no more than 1 cm away from the V_OUT pin, and connected directly between V_OUT and GND pins.
The value may be increased without upper limit.
Thermal Considerations
It is important that the thermal limit of the package is not exceeded. The ACE1117 has built-in thermal
protection. When the thermal limit is exceeded, the IC will enter protection, and VOUT 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]
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, T_A is the ambient temperature, and Θ_JA is around 180°C/W for ACE1117. ACE1117 is
designed to enter thermal protection at 175°C. For example, if TA is 25°C then the maximum PD is limited
to about 0.83W. In other words, if I_OUT(MAX) = 500mA, then [V_IN – V_OUT] can not exceed 1.66V. (Ref.
SOT-223 without heat sink.)
Typical Performance Characteristic
Reference Voltage vs Junction Temperature
Output Voltage vs Junction Temperature
Junction Temperature (℃)
Junction Temperature (℃)
VER 1.4 4