A6110
AiT Semiconductor Inc.
www.ait-ic.com
LOW DROPOUT VOLTAGE REGULATOR
1A HIGH PSRR CMOS,LINEAR REGULATOR
DETAILED INFORMATION
The A6110 is a low dropout CMOS-based positive voltage regulator that operates the input voltage from
+2.5V to 6.0V. Output voltages are optional ranging from 1.0V to 5.0V, and can supply current up to 1.0 A.
Thermal Protection
Thermal overload protection limits total power dissipation in the A6110. When the junction temperature
exceeds TJ=165°C, the OTP circuit starts the thermal shutdown function and turns the pass element off
allowing the IC to cool. The OTP circuit turns on the pass element again after IC’s junction temperature cool
by 30°C, result in a pulsed output during continuous thermal overload conditions. Thermal-overloaded
protection is designed to protect the A6110 in the event of fault conditions. Do not exceed the absolute
maximum junction temperature rating of TJ=125°C for continuous operation. The build-in fold-back current
limit protection circuit will reduce current value as output voltage drops. When output is shorted to ground,
current limit is reduced to 250mA, avoiding damaging the device.
Operating Region and Power Dissipation
The maximum power dissipation of A6110 depends on the thermal resistance of the case and circuit board,
the temperature difference between the die junction and ambient air, and the rate of airflow. The power
dissipation across the device is
PD = (VDD−VOUT) ×IOUT + VDD×IQ
The maximum power dissipation is
PD (MAX) = (TJ (MAX) − TA) /θJA
Where TJ (MAX) is the maximum operation junction temperature 125°C, TA is the ambient temperature and
the θJA is the junction to ambient thermal resistance. The GND pin of the A6110 performs the dual function of
providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using
a large pad or ground plane.
Capacitor Selection and Regulator Stability
Like any low-dropout regulator, the external capacitors used with the A6110 must be carefully selected for
regulator stability and performance. The A6110 requires an output capacitor between the VOUT and GND pins
for phase compensation. Using a capacitor whose value is ≥1μF on the A6110 input and the amount of
REV1.7
- OCT 2010 RELEASED, APR 2016 UPDATAED -
- 9 -
AITSEMI [ AiT Semiconductor ]
