Hi Team,
I am looking for a converter. Can you suggest a part which meets below spec.
Input Voltage : 5V - 33V
Output Voltage : 3.3V
Iout : 1A - 2A
Efficiency : >90%
Quicent Current should be very low.
Regards
Anuraj NK
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Hi Anurai,
You can try LM61440(7.5uA, 4A ) or LM63625(25uA, 2.5A).
Thanks for Quick replay. From simulation I can see that the efficiency is only ~70%. Why this so. What should I do get higher efficiency.
My nominal operating range will be below.
Vin : 24V
Iout : 0.3A - 0.75A
Vout : 3.3V
Can you suggest few more parts which current capacity is between 0.75A & 1.5A.
Hello Anuraj,
The device has 6A fets integrated. Losses become less prevalent at higher load currents due to higher output power. At lower load current, lower output power, losses appear more significant. Regardless, if this is battery application this may become issue. If you are concerned with heat, as low output power, "degraded" eff results in minimal temp rise.
If you want higher output power capability, your low load current eff fig will take a hit.
LM63615
LM63610
Above parts good for the lower current level.
Hi Beck,
My team suggested a part. LMR50410
I am planning to use this part LMR50410 for 3.3V and 5V with 1A output.
What is your comments/suggestion on LMR50410 over LM63615 & LM63610
Regards
Anuraj NK
What should be the lead time of this part LMR50410.
I am not able to find this part online.
Hi,
Thanks for the replay.
Can you suggest a part/solution meeting the below requirement.
Input Voltage : 10V - 30V
Output Voltage : 5V
Output Drawn by the circuit is <5mA during normal operation of circuit.
I could see the efficiency of most of the converters are very less. Can you suggest a apart with high efficiency.
Would LMR36503 fulfill your requirements?
Device has fixed 5V output variant for improved light load performance.
Hi,
I decide to use the part LMR36510ADDAR. I could see the EN is having Hysterisis.
I have the set the value of Von as 7V and designed. Do you have any tool available to calculate the Von anf Voff value from the selected Resistor value.
What should be the value of Ven-h & Ven-hys to be used in the equation to calculate the Von and Voff. please let me know
Hi,
I decide to use the part LMR36510ADDAR. I could see the EN is having Hysterisis.
I have the set the value of Von as 7V and designed. Do you have any tool available to calculate the Von anf Voff value from the selected Resistor value.
What should be the value of Ven, Ven-h & Ven-hys to be used in the equation to calculate the Von and Voff. please let me know.
Von and Voff can be determined using EC specification VEN-VOUT-H and hysteresis specification, in addition to voltage divider equation.
Sorry, I am bit confused here.
Von & Voff can calculate from the below equation. Please confirm.
I designed the resistors values (Rent & Renb) using TI Design tool for 7V UVLO and the resistor values are 422K & 100K Respectively. may i know with this resistor combination, what is the Von voltage?
I am not sure about what should be the value of Ven-h, Ven-hys, Ven to be considered in the above equation to calculate the Von & Voff voltage.
Hello,
I will share excel sheet shortly with the calculations.
Please allow me to follow up.
Thanks. Waiting for the excel to confirm and freeze the design. Will be appreciated if share the excel before Monday 19/10/202.
var
RENT=xOhms
RENB=xOhms
VEN-VOUT-HYS (typ) = 110mV
VEN-VOUT-H (typ) = 1.23V
"VEN-VOUT-L" = VEN-VOUT-H - VEN-VOUT-HYS
vin rising
VEN-VOUT-H = (RENB/(RENT+RENB*))VIN
vin falling
"VEN-VOUT-L" = (RENB/(RENT+RENB*))VIN