Part Number: LMZ21700 We have a design that is using a LMZ21700 to step down an input voltage.
We have observed that if we apply +5V to EN and then some seconds later apply +5V to Vin, the part fails and is not recoverable.
The circuit only works…
Part Number: LMZ21700 I used the LMZ21700 in my design and now that we are trying to build our manufacturer is saying that they have had issues with soldering this part in the past. They pointed me to a study done by Flextronics about Bottom Terminated…
Part Number: LMZ21700 Hello,
We have a customer inquiring about the plating process for this device. I am not finding anything, other than "Call TI".
From customer:
"What is the plating on the area where this gets soldered to our PCB? If gold, is…
Doug,
I'd like to reference the PCB layout example in the datasheet (Section 10.2.1.1) This is similar to your PCB layout with the exception that Layer 3 and Layer 4 are GND layers which helps further isolate the noise and "sandwich" the VOS signal…
Denislav,
Thanks for the information.
I checked with the PCB layout Eng and he stated the Cin Cap is 0.043 Inches away from the LMZ21700. Cin is on the same side as LMZ21700. We need to keep the area of this current loop small. Is this close enough…
Hi Nicholas,
To summarize, I think the main issue you had was with your EN signal not working. This is caused by the capacitor that is storing enough charge and preventing you from pulling EN pin low. I'd recommend removing this 100nF capacitor. Regarding…
Other Parts Discussed in Thread: LMZ21700 I am designing an circuit to use the LMZ21700 for an output of 5.5 V with max 0.5 A of current. Input Voltage is 14 - 17 V DC. Pg 22 of the datasheet indicates for a 5 V output V RFBT = 232K and RFBB = 44.2K.…
Other Parts Discussed in Thread: LMZ21700 Hi,
LMZ21700 is rated for 0.9 < Vout < 6.0 under "Recommended Operating Conditions". Using the datasheet feedback equation RFBT = RFBB x (VOUT/ 0.8 – 1), it's possible to achieve Vout = 7.1V using:
Vin = 11…
Other Parts Discussed in Thread: LMZ21700 I'm using an lmz21700 in our product.
I saw a bad behavior on low input voltage.
In our application we supply the board with a rechargable lithium battery, the input range is 3.3 to 4.1V, the output…
Other Parts Discussed in Thread: LMZ21700 Hi Team,
What is the maximum Soft-Start time supported, or the maximum capacitive load supported by the LMZ21700 which will keep the internal FETs in their SOA (Safe-Operating-Area)?
Thanks,
Nabeel
