Schematic for Low Current Boost Converter based on MT3608: Cheap and...

Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
A net identifier used to create connectivity to other Net Portal with the same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
jharwinbarrozo
14.2k
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Manufacturer Part Number

MT3608

Resistance

39k Ω

Manufacturer Part Number

1N5817WS

Capacitance

10u F

Inductance

4.7u H

Capacitance

10u F

Resistance

2k Ω

Distributor	Qty 1
	LCSC	$0.23–$0.24
	Mouser	$0.00

can you suggest equivalent replacement for MT3608?

jharwinbarrozo

@copilot can you suggest equivalent replacement for MT3608?

3mo

copilot

I don't have direct access to databases for component specifications, but I can suggest some equivalent boost converter ICs based on the MT3608, which is a 1.2MHz step-up converter designed for small, low power applications. Some potential alternatives might include:

TPS61032 by Texas Instruments: A step-up DC-DC converter that can handle similar voltage ranges and has a high switching frequency.

MIC2605 by Microchip Technology: Offers similar features with low-profile package options.

LT1302 by Analog Devices: Another boost converter with similar applications, although its switching frequency is lower, which might affect your inductor size if space is a constraint.

NCP1406 by ON Semiconductor: A high-efficiency step-up DC-DC converter suitable for 12V applications.

These parts may differ in terms of package size, voltage, and current capabilities, so be sure to check the specific datasheets and verify that the component meets the required specifications of your design, such as input/output voltage and current requirements. If you have more specific constraints or requirements, please let me know!

3mo

what does this circuit do?

jharwinbarrozo

@copilot what does this circuit do?

3mo

copilot

This circuit is a boost converter, designed to increase (or "boost") a lower input voltage to a higher output voltage. It's using the MT3608, which is a step-up converter IC.

Here are some key points about this circuit and its components:

Input and Output: The circuit takes a (likely lower) input voltage through the IN connector and provides a boosted output voltage through the OUT connector.

MT3608 IC ( $U1$ ): This IC is responsible for the voltage boost. It uses a switch-mode power supply design to perform the boost conversion efficiently.

Inductor L1 (CPY160808T-4R7M-NP): Connected to the switching pin of the MT3608, the inductor stores energy when the switch is on and releases energy to the load when the switch is off. This is a crucial component in the boost operation.

Diode D1 (1N5817WS): Used to ensure current flows in the correct direction during the energy release phase of the boost operation.

Capacitors C1 and C2 (C0603X5R106M250NT): These are used to filter the input and output voltages, smoothing the supply and output to reduce ripple.

Resistors R1 (0603WAF3902T5E) and R2 (0603WAF2001T5E): These form a voltage divider connected to the feedback pin of the MT3608, setting the output voltage by regulating the feedback voltage to a set reference.

This specific design is used for low current applications with a maximum current requirement of 30mA, making it suitable for powering small electronic devices that need a stable higher voltage from a low voltage input source. If you have any further questions or need details on any specific part of the circuit, feel free to ask!

3mo

can you explain the circuit working and what could be the output voltage for 3.3...

rehman225

@copilot can you explain the circuit working and what could be the output voltage for 3.3v of input for the circuit.

copilot

This is a typical step-up (boost) converter using the MT3608 step-up adjustable DC-DC switcher IC. This type of converter is used to step up an input voltage to a higher level at the output.

Here is a basic rundown of the circuit function:

The input voltage (2.5V to 24V) is fed into pin IN and EN of the MT3608. The IN pin is for the input supply, while the EN pin is a chip enable pin (active high). The input voltage is also bypassed by a 10uF capacitor (C2).

The MT3608 switcher IC boosts the voltage at the SW pin, which is connected through the inductor L1, and the Schottky diode D1, to charge the output capacitor C1.

The resistive divider network of R1 and R2 is connected to the feedback (FB) pin of MT3608. This network sets the output voltage using the following formula:

V_{OUT} = V_{FB} (1 + \frac{R1} {R2} )

where $ V_{FB} $ is typically 0.6V for MT3608.

Now, if you want to find the output voltage for an input of 3.3V, the input voltage doesn't directly relate to the output because this is a fixed output boost converter and the output voltage is determined by the feedback resistors R1 and R2. You can adjust these resistors to set the desired voltage.

If you are using the resistors as per your component list (39k for R2 and 2k for R1), the output voltage can be calculated as:

V_{OUT} = 0.6V * (1 + \frac{39000} {2000} )

V_{OUT} = 12.6V

So, irrespective of the input being 3.3V, the output will be around 12.6V, provided the input voltage is within the operating range of the MT3608 (which is 2.5V to 24V) and the load does not require more current than the converter can supply.

Hey, I'm copilot! I can help you with all kinds of stuff in your project. Reac...

copilot

Hey, I'm copilot! I can help you with all kinds of stuff in your project. Reach me at any time by tagging me on comments or in the chat with my handle, @copilot.

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	Designator	Ruleset
	-	fabShape hidden
	＊`REF`＊	Override rule for ＊`REF`＊
	P2	C1 P2 pad
	＊`REF`＊	Override rule for ＊`REF`＊
	-	hide inductors value
	-	Connectors Silk Disable
	P2	R2 P2 pad
	＊`REF`＊	Override rule for ＊`REF`＊
	＊`REF`＊	Override rule for ＊`REF`＊
	Pin_2	Override rule for Pin_2
	-	IN 3d model
	Pin_1	Override rule for Pin_1
	-	All text size
	＊`VALUE`＊	Override rule for ＊`VALUE`＊
	＊`REF`＊	Override rule for ＊`REF`＊
	Pin_1	IN GND pad
	-	hide capacitors ref
	Pin_2	Override rule for Pin_2
	-	hide resistors designator
	＊`VALUE`＊	Override rule for ＊`VALUE`＊
	＊`REF`＊	Override rule for ＊`REF`＊
	-	hide inductors REF
	P2	C2 P2 pad
	-	keepout min
	＊`VALUE`＊	Override rule for ＊`VALUE`＊
	-	hide capacitors value
	Pin_1	New ruleset
	Pin_1	Override rule for Pin_1
	＊`REF`＊	Override rule for ＊`REF`＊
	＊`REF`＊	Override rule for ＊`REF`＊
	-	hide resistors value
	＊`VALUE`＊	Override rule for ＊`VALUE`＊
	＊`REF`＊	Override rule for ＊`REF`＊
	＊`VALUE`＊	Override rule for ＊`VALUE`＊

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jharwinbarrozo / Low Current Boost Converter based on MT3608

Schematic

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