LM3670: LM3670MF-3.3/NOPB : workaround or device alternatives with better Vout stability at low load?

Hi AnBer,

No, it is not possible to disable the PFM mode in LM3670. 0.1% output voltage accuracy is too tight for the device. we have TPS62200 device which is with SOT23 package but doesn't have FPWM mode. If the package is not a major requirement than there are some devices with FPWM mode. So, I would suggest you look at the link for your require device: http://www.ti.com/power-management/overview.html 

Best regards,

Tanvee

Hi Tanvee,

Thanks for the answer.

Looking at alternatives you suggested in SOT-23 I saw:
http://www.ti.com/power-management/non-isolated-dc-dc-switching-regulators/step-down-buck/buck-converter-integrated-switch/products.html#p238min=1.5;4.5&p238max=5.5;6&p634min=-17;3.3&p634max=3.3;92&p451max=0.3;0.9&p236typ=0.00006;0.146&p212max=76.92307692307692;100&sort=p1130;asc

with Forced PWM but in SOT-23-THIN
TPS62561
TPS62240

Without Forced PWM in SOT-23:
TPS62200, TPS62203
TPS62260

-Any other options you would advise for 0.1% accuracy output at the specs specificied in my original post?
-Is the 0.1% accuracy output something that can be simulated on Webench?
-It does not seem we provide Webench sim for TPS62200, TPS62203. Is it planned?
Also only the PSPICE/TINA-TI transient model is provided.

Thanks in advance,

A.

Hi,

There is no device with 0.1% voltage accuracy. PSPICE or TINA model gives all information that can be achieved from the WEBENCH model. Currently, there is no planning for WEBENCH model.

Best regards,

Tanvee