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MT3608

2A boost converter, 2-24V in, up to 28V out, 1.2MHz, SOT-23-6, popular DIY boost module

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Manufacturer Part：

MT3608

Package：

SOT-23-6 (2.9 x 2.8 x 1.5mm)

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Description

Product Overview

The MT3608 from Aerosemi is a 2A step-up (boost) DC-DC converter with a fixed 1.2MHz switching frequency. Operating from 2V to 24V input, it can generate output voltages up to 28V with internal 1.2A switch current limit in a compact SOT-23-6 package.

Key Specifications

Input Voltage Range 2V to 24V
Output Voltage Range VIN to 28V (adjustable)
Switch Current Limit 1.2A (internal MOSFET)
Output Current Up to 2A (depends on VIN/VOUT ratio)
Switching Frequency 1.2 MHz (fixed)
Reference Voltage 0.6V
Shutdown Current <1 uA
Efficiency Up to 93%
Operating Temperature -40 to 85 C
Package SOT-23-6

Features

  • Internal 1.2A N-channel MOSFET switch
  • Fixed 1.2MHz frequency allows small external components
  • Adjustable output voltage via external resistor divider
  • Internal soft-start and current mode control
  • Under-voltage lockout and over-temperature protection

Applications

  • Battery-powered boost converters
  • OLED and LCD bias supplies
  • LED string drivers
  • USB power bank boost circuits
  • Solar-powered energy harvesting

The MT3608 from Aerosemi is a compact and cost-effective step-up (boost) DC-DC converter with an integrated 1.2A N-channel MOSFET. Operating from 2V to 24V input, it can boost the voltage up to 28V output using a fixed 1.2MHz switching frequency. The current-mode control architecture provides fast transient response and stable operation. With efficiency up to 93% and a shutdown current below 1uA, it is widely used in battery-powered boost applications, USB power banks, and bias supply generation for displays.

The MT3608 employs a current-mode boost converter architecture. **Power Stage**: The internal N-channel MOSFET switches at 1.2MHz, storing energy in an external inductor during the on-time and releasing it to the output through an external Schottky diode during the off-time. **Control Loop**: Current-mode control compares the peak inductor current against the error amplifier output. This architecture provides inherent cycle-by-cycle current limiting and simplifies loop compensation. The output voltage is set by an external resistor divider connected to the FB pin (reference 0.6V). **Soft-Start**: Internal soft-start gradually increases the current limit during startup, preventing excessive inrush current that could damage the input supply or cause output overshoot. **Protection**: Under-voltage lockout (UVLO) prevents operation when input voltage drops below approximately 1.6V. Thermal shutdown protects the device when junction temperature exceeds safe limits.

Pin Name Description
1 LX Switching node (inductor connection, internal MOSFET drain)
2 GND Ground
3 EN Enable input (high=on, low=shutdown)
4 FB Feedback voltage input (reference 0.6V)
5 VIN Input supply voltage (2V to 24V)
6 LX Switching node (inductor connection, internal MOSFET drain)
  • Power Banks: Boosting single-cell Li-ion (3.7V) to 5V USB output for portable charging
  • Display Bias: Generating 12V-15V bias voltage for OLED and TFT-LCD modules from 3.3V/5V
  • LED Drivers: Powering series LED strings from low-voltage battery sources
  • Solar Harvesting: Boosting low-voltage solar panel output to usable voltage levels
  • Arduino Projects: 5V to 12V boost for motor drivers and relay modules from USB power
Model Manufacturer Key Difference
MT3608 with module Aerosemi Pre-assembled boost module with potentiometer
XL6009E1 XLSEMI 4A, 35V output, 400kHz, TO-263
LM2733XMF TI 1A, 2.7-14V in, 1.6MHz, SOT-23-5
TPS61021ADSGR TI 3A, 0.5-5.5V in, 2.5MHz, WQFN
SX1308 Suosemi 2A, 2-24V in, 28V out, SOT-23-6, pin-compatible
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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