AP1159ADSXX Datasheet, PDF (17/19 Pages) Asahi Kasei Microsystems – 14V Input / 100mA Low voltage Output LDO Regulator

[AP1159ADS]
12. Definition of technical terms
■Relating Characteristic
・Output Voltage (Vout)
The output voltage is specified with Vin=(Vout_TYP+1V) and Iout=5mA.
・Maximum Output Current (Iout MAX)
The rated output current is specified under the condition where the output voltage drops 0.3V the value
specified with Iout=5mA. The input voltage is set to Vout_TYP+1V and the current is pulsed to minimize
temperature effect.
・Dropout Voltage (Vdrop)
The dropout voltage is the difference between the input voltage and the output voltage at which point the
regulator starts to fall out of regulation. Below this value, the output voltage will fall as the input voltage is
reduced. It is dependent upon the load current and the junction temperature.
・Line Regulation (LinReg)
Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes.
The line regulation is specified as the input voltage is changed from Vin=Vout_TYP+1V to Vin=Vout_TYP+6V. It
is a pulse measurement to minimize temperature effect.
・Load Regulation (LoaReg)
Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes.
It is a pulsed measurement to minimize temperature effects with the input voltage set to Vin=Vout_TYP+1V. The
load regulation is specified output current step conditions of
5mA to 100mA.
・Ripple Rejection (R.R)
Ripple rejection is the ability of the regulator to attenuate the ripple content of the input voltage at the output.
It is specified with 200mV_rms, 1kHz super-imposed on the input voltage, where Vin=Vout+1.5V. Ripple
rejection is the ratio of the ripple content of the output vs. input and is expressed in dB.
・Standby Current (Istandby)
Standby current is the current, which flows into the regulator when the output is turned off by the control
function (Vcont=0V).
■Relating Protection Circuit
・Over Current Sensor
The over current sensor protects the device when there is excessive output current. It also protects the device if
the output is accidentally connected to ground.
・Thermal Sensor
The thermal sensor protects the device in case the junction temperature exceeds the safe value (T_J=150C).
This temperature rise can be caused by external heat, excessive power dissipation caused by large input to
output voltage drops, or excessive output current. The regulator will shut off when the temperature exceeds the
safe value. As the junction temperatures decrease, the regulator will begin to operate again. Under sustained
fault conditions, the regulator output will oscillate as the device turns off then resets. Damage may occur to the
device under extreme fault.
Please reduce the loss of the regulator when this protection operate, by reducing the input voltage or make
better heat efficiency.
In the case that the power, VinIshort (Short Circuit Current), becomes more than twice of the maximum
rating of its power dissipation in a moment, there is a possibility that the IC is destroyed before internal
thermal protection works.
・Reverse Voltage Protection
Reverse voltage protection prevents damage due to the output voltage being higher than the input voltage. This
fault condition can occur when the output capacitor remains charged and the input is reduced to zero, or when
an external voltage higher than the input voltage is applied to the output side
・ESD
MM: 200pF 0 200V or more
HBM: 100pF 1.5k 2000V or more
Rev.0.1
- 17 -
2014/09