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MT3608 — Compact SOT23-6 Boost Converter
The MT3608 is a fixed-frequency, current-mode PWM step-up (boost) converter from XI'AN Aerosemi Technology, housed in a tiny 6-pin SOT23-6 package. It accepts input voltages from 2V to 24V and regulates output up to 28V, making it one of the most versatile small boost ICs available. Its 1.2MHz fixed switching frequency keeps external components small — inductors as small as 4.7µH are sufficient — and its internal compensation eliminates the need for an external compensation network.
The internal soft-start mechanism significantly reduces inrush current, which is critical for extending battery life in lithium-polymer applications. At light loads, the converter automatically shifts to Pulse Frequency Modulation (PFM) mode, dropping quiescent current to around 100µA and keeping standby power drain low. An EN pin allows logic-controlled shutdown, pulling supply current below 1µA when disabled — useful for any battery-powered design with sleep modes.
Output voltage is set entirely by two external resistors on the FB pin using the formula VOUT = 0.6 × (1 + R1/R2), with no other programming components needed. Capacitors on the input and output smooth voltage fluctuations, making this setup well-suited to portable gadgets, USB charging circuits, LED drivers, or anywhere adjustable voltage boosting is needed in a tight footprint.
Pinout Explorer
The interactive explorer below maps all six pins of the MT3608's SOT23-6 package. Click any pin to see its full description, operating range, and design notes — including the SW switching node layout warnings, FB resistor divider guidance, and EN tie-off requirements.
Feel free to adjust the tone or length. A few things you might want to add depending on your post style: a typical application schematic description, a component selection table (inductor value vs. output current), or a comparison callout against the MT3608's common alternatives like the XL6009 or SX1308.
