AnsweredAssumed Answered

ADM7155. About minimum Vin.

Question asked by ADandrey on May 5, 2016
Latest reply on May 17, 2016 by jespirit


Sorry for my English. It is not my native language.


I want to use ADM7155-04 with Vin = 3.2 - 4.2 V; Icc (max) = 100mA.

Vout = 3.3 V


In the datasheet on the chart I found the information about Vdropout = 60mV ( Vout=3.3V and Icc =100mA).

Will I be able to use this regulator at Vin= 3.2V to achieve Vout = 3.140 mV ( at Vout=3.3V with resistor devider).


I dont understand about Vreg = 3.6 V ( for ADM7155-04 in datasheet: Figure 42. Simplified Internal Block Diagram) and all the measurements are carried out at Vin = Vout(max) + 0.5V.


Table 10. Model Selection Guide for Input Voltage(in datasheet) indicates that for the ADM7155-04 Vout =1.2-3.4V at minimum Vin=3.9 V Icc=600 mA but on the first page datasheet Dropout voltage: 120 mV typical at VOUT = 3.3 V, IOUT = 600 mA


What do you think about it?