Part Number: LMZ21700 Hi.
I'd like to get VOUT = 4.5 V (Output Current = 0.1 A) at Vin = 4.75 V using the LMZ 21700, Is there a problem with the dropout characteristic of this device? I saw the figure 8. Dropout of the data sheet (SNVS 872 C) and it…
Hi Nick,
Adding the diode in the feedback path may affect the converter loop and stability. I have not tried that before. Consider testing this using the PSpice model and run steady state, load transient, startup, etc to see if the converter shows signs…
Part Number: LMZ21700 I have a PCB designed with the LMZ21700SILT device. I like it for the small package due to size constraints on my board. However there is considerable audible noise associated with the 22uf input & output MLCC SMT caps (22uf, X7R…
Hi Ben,
There is an error that I've identified in the Ultralibrarian tool when generating the 3D step model using the bxl file found on the LMZ21700 product folder. I'll get in contact with the modeling/packaging team to get this resolved. I'm hoping…
Part Number: LMZ21700 I have observed a failure mode on the LMZ21700SILR regulator, the symptom is as follows:
When the regulator is not powered, the impedance between pin 4 and ground is 4.7 ohms.
When the regulator is powered with 12V, the…
Part Number: LMZ21700 The front page of the data sheet says that it is OK for startup into pre-biased outputs, but there is no information in the datasheet concerning any functional details or constraints.
Is the following an accurate description of…
Part Number: LMZ21700 Hello,
We use this IC in an automotive application to convert a +12V battery rail to 1.8V and have observed a failure. The output impedance between pin 4 and ground is 4 ohms and the output voltage is zero. Are you aware of any…
Part Number: LMZ21700 Are there any known issues with this device? I have experienced a failure in a new design after about 20 hours of normal operation. The device steps 12V down to 5.2V. The output impedance to ground now measures about 1.4ohms and…
Hi Massimo,
We were able to setup the testbench in SIMPLIS to measure output impedance for LMZ21700. Test conditions: VIN=12V, VOUT=1.2V, ILOAD=3A CLOAD=200uF, ESR=0.3Ohms.
Please find the simulation result below. I hope it helps.
Thanks & Regards…
Hi Romain,
Sorry for the late reply. This is definitely engineering samples that predate the existing finalized LMZ21700 package. Just wanted to be clear that this was never released as an option for during production. This molded package was most…
