KCC's Quizzes AQQ305 about a mutual exponentiation equation
1. Quote of the month: "A train station is where a train stops. A bus station is where a bus stops. I have a work station on my desk, so..." - unknown
2. Quiz AQQ305 about finding a mutual exponential equation
Good luck, and try to be among the
View All
September Monthly Blog Quiz! Read the blog, take the quiz, and you could win a gift card
Quiz: How Well Do You Know Adaptive Power Switching?
Is your I/O module overheating? The AD74416H's Adaptive Power Switching (APS) can cut heat dissipation by up to 40% — but how well do you really understand how it works?
Read the blog first: Cooling
View All
ADP160
Production
The ADP160 / ADP161 / ADP162 / ADP163 are ultralow quiescent
current, low dropout, linear regulators that operate from 2.2 V
to 5.5 V and provide up to...
Datasheet
ADP160 on Analog.com
Hello Sir,
i have designed a power supply circuit based on ADP160AUJZ-3.0, the circuit diagram is below
PWR_BATT is Vin = 4.5V
PWR_RTC is Vout = 3.0V
The result is:
1. when load current is 3uA, Iq = 87uA
2. when no load on output port, Iq > 80uA
3. if i cut pin 3 from Vin, and connected to gnd, Iq < 1uA
So i think there must be something wrong with my design. because Iq is more great than spec..
Please help me, thank you.
Michael,
it would be necessary to know how you measure the currents.
Can you draw a picture of how you connect all your instruments when you measure 3uA on the load and 87uA on the input?
Are you sure you measurement equipment is not drawing that additional 80uA?
80uA at 3.3V output is equivalent to a 41Kohm resitance, that seems like a lot of load but are you sure your DMM is really high impedance?
LucaV
Hello LucaV,
actually, i didn't measure the load current, i used a RTC IC(pcf8563) as load, and it's working current is less than 3uA.
so there was no DMM on Vout port.
on the other hand,,when i make Vout open, Iq was still large than 80uA.
How did you measure the input current?
Can you draw everything that is connected.
And can you give me the part numbers of the caps you used?
Luca
Hi,
pls refer to the diagram below:
The power is 4.5V, XMM1 is DMM(Agilent 34401A)
C35 and C36 are ceramic capacitors: 1uF,16V
when i connected EN to GND, the current read from DMM is less than 1uA, so C36 is ok
when i cut off the load, and even delete C35, the current is higher than 80uA
and i also test current from EN, it's less than 0.1uA
So was there anything i do wrong?
It looks correct,, have you tested other ADP160s, maybe you damaged the part with ESD or something else.
LucaV
i have change IC to XC6504-3v in same design, and now,goes right.
i have change several piece of adp160, and still not work well, so i didn;t think it was ESD problem.
Michael,
I am interested to know if the ADP160 you were testing was exposed to ligh. Look at this discussion
https://ez.analog.com/message/34596#34596
It may be possible that exposure to ligh would also increase quescent current. I think you were using the SOT23 package but maybe that could be affected also?.
LucaV
