ACE1117 datasheet(4/8 Pages) ACE

4 / 8 page

ACE1117

1A Positive Voltage Regulators

VER 1.4

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 VOUT pin, and connected directly between VOUT 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 (PD) is PD = IOUT * [VIN – VOUT]

The thermal limit of the package is then limited to PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction

temperature, TA is the ambient temperature, and ΘJA 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 IOUT(MAX) = 500mA, then [VIN – VOUT] 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 (℃)

ACE1117 Datasheet(PDF) 4 Page - ACE Technology Co., LTD.