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What is the output voltage of a LDO?
When I give this pulse at the LDO input, the output voltage 5V goes to 0V like shown below. The current was stable at 150mA but when this pulse is applied, it goes above 350mA and then to 0A and oscillates as shown below.
Why is my LDO not providing an enable signal?
Initially when I power on the LDO by given the input voltage but I am not providing an ENABLE signal to the LDO, I am getting a voltage of 2.65V at the LDO output for 5 seconds. Please see the below waveform. Can someone tell me why this is happening? I am not able to find anything related to this in the datasheet.
What to do when LDO output goes high?
Maybe use a pull-down resistor on enable pin if it is active high, or vice versa if it is active low. It might be floating at power-up and so output goes high momentarily until it settles and goes low. That would charge the output capacitors – until the output capacitors drain, there will be a (residual) voltage present at Vout. Maybe.
How does a low dropout regulator ( LDO ) work?
An LDO regulates the output voltage with a low dropout voltage (the difference between Vout and the lowest specified value of Vin at the rated load current). Basic LDO architecture 4. An LDO consists of a voltage reference, an error amplifier, a feedback voltage divider, and a pass transistor, as shown in Figure 1.
Input voltage range is 3.6 V to 4.5 V. Output current range is 80 mA to 100 mA. The maximum quiescent current is 17 µA. Then, the minimum efficiency is obtained as follows: Efficiency 100 mA 3.3 V (100 mA 17 µA)4.5 V ×100 73.3 % 2.
What is the standby current in a LDO regulator?
Standby current is the input current drawn by a regulator when the output voltage is disabled bya shutdown signal. The reference and the error amplifier in an LDO regulator are not loadedduring the standby mode, as shown in Figure 4.
What’s the best way to do voltage translation?
The general way to handle voltage translation for such applications is to use high speed logic, and a combination of the WR/RD and CS pulses to set the direction of a more traditional level translating buffer like the SN74LVC1T45 and it’s 2, 8, 16 bit variants.
How is the quiescent current of an LDO determined?
Quiescent current consists of bias current (such as band-gap reference, sampling resistor, anderror amplifier currents) and the gate drive current of the series pass element, which do notcontribute to output power. The value of quiescent current is mostly determined by the seriespass element, topologies, ambient temperature, etc.