dc to dc converter circuit is needed please

[Abdulhakim]

i want some to send me a 3.7v to 5v converter circuit diagram please

 

[ashugtiwari]

voltage rating is not enough, u also need to provide the load current continuous, peak and average. For anything less than equal to 1A, u can use the boost converter IC from different manufacturer like NI, linear tech, analog devices etc. U can get the complete part selection from their respective websites.
For currents more than few amperes, usually a separate boost converter is used with MCU to control switching cycle. U can designs from google. microchip.com has several reference designs and application notes for boost, buck and flyback converters with complete design guide.

 

[D.A.(Tony)Stewart]

Besides performance specs, you also need to specify functional and realistic requirements for Cost, Size and Efficiency

Lowest Cost is not always highest Efficiency and fewest parts is not always best performance.

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Since you are obviously new at this, I took the liberty of selecting a design for you.

Read all the details and don't substitute without good reason.
This took me all of 1 minute to design using 3~4.2 Vin, 5Vo , 1Aout ,ξ= 93%, low part count.

EDIT
But then wasted many minutes to copy and paste here ... and to make matters worse , I pasted the wrong snapshot of schematic.
Apologies

Create a free login to www.ti.com then use all the features on the main page for the Power Supply Design, Analyzer, Simulator, BOM creator.
It is limited to low power designs.

Part	Manufacturer	Part Number	Quantity	Price	Attribute 1 Name	Attribute 1 Value	Attribute 2 Name	Attribute 2 Value	Attribute 3 Name	Attribute 3 Value	Footprint
Cin	TDK	C2012X5R0J226M	1	0.06	Cap	22uF	ESR	0Ohm	VDC	6.3V	805
Cout	MuRata	GRM21BR61A106KE19L	3	0.03	Cap	10uF	ESR	2mOhm	VDC	10V	805
Css	MuRata	GRM033R60J153KE01D	1	0.01	Cap	15nF	ESR	0Ohm	VDC	6.3V	201
L1	Bourns	SRU1028-1R0Y	1	0.33	L	1uH	DCR	4.9mOhm	IDC	7A	SRU1028
U1	Texas Instruments	TPS61232DRCR	1	1.15							DRC0010G

 

[Abdulhakim]

i want. input voltage 3.7v and output 5v, 1amp usb charger

 

[bowman1710]

Sunny sun sky, what software did you use for that?

 

[D.A.(Tony)Stewart]

You can do same after you create a free login to www.ti.com. The design tool is on front page.

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i want. input voltage 3.7v and output 5v, 1amp usb charger

Abdul which part of my comments/solution did you not understand?

 

[D.A.(Tony)Stewart]

I selected the wrong schematic for post #3 ,so I deleted it and corrected it here.,

 

[Abdulhakim]

sir. any replacement for IC tps6123

 

[D.A.(Tony)Stewart]

sir. any replacement for IC tps6123

You mean a tps61232drc ?
There are hundreds of different solutions. Go to your favorite site. I suggested one site and 1 solution.
You offered no criteria. This does what you asked and only costs <$3 in 7 parts,
3 Caps being to same to achieve ultra low ESR.

 

[Easyrider83]

**broken link removed**

 

[D.A.(Tony)Stewart]

**broken link removed**

This cheap converter is good for couple hundred mA with more ripple.
KB2301

 

[Anna Conda]

A LMC555 based boost converter will do this nicely, very few parts, low power consumption at no load.