3.7V to 5V/8V/9V/12V Mini DC-DC Step-Up Boost Converter Module

3.7V to 5V/8V/9V/12V Mini DC-DC Step-Up Boost Converter Module is an ultra-compact fixed/solder-selectable synchronous boost regulator board that steps up a 2.5V to 5V DC input (such as a single 3.7V 18650/LiPo battery) to a regulated 5V, 8V, 9V, or 12V DC output. Featuring two onboard solder jumper pads (A and B) for dead-accurate output voltage selection without bulky potentiometers, plus a jumper-disableable LED power indicator, it fits into the tightest wearable and handheld enclosures.

Key Features:

• Solder-Pad Selectable Output (5V / 8V / 9V / 12V): Two binary solder jumpers (Pad A and Pad B) set the exact output voltage to 5V, 8V, 9V, or 12V (default factory setting is 12V with both jumpers closed).
• Optimized for Single-Cell 3.7V Lithium Batteries: Operates across a 2.5V to 5.0V input range (VOUT must remain higher than VIN), extracting full capacity from 3.7V Li-Ion and LiPo cells.
• Power-Saving LED Disable Jumper: Onboard solder jumper next to the red status LED can be opened with a soldering iron to eliminate LED current draw in ultra-low-power battery applications.
• Sub-Miniature Postage-Stamp Size: Measures just 22mm × 11mm × 3.6mm, easily hiding inside battery compartments, multimeter bays, and miniature sensors.
• Low Ripple Synchronous Boost: Shielded SMD power inductor and MLCC output capacitors deliver clean DC power up to 1A input current.

Technical Specifications:

• Input Voltage Range: 2.5V to 5.0V DC (Must be lower than selected output voltage)
• Selectable Output Voltages: 5V, 8V, 9V, or 12V DC (Set via Solder Pads A & B; Default = 12V)
• Output Current Capability (from 3.7V Li-Ion Input): 5V at ~1.0A–1.2A | 8V at ~0.7A | 9V at ~0.6A | 12V at ~0.5A
• Solder Jumper Truth Table (Pad A / Pad B): A=0, B=0 → 5V | A=0, B=1 → 8V | A=1, B=0 → 9V | A=1, B=1 → 12V (Default)
• Operating Temperature Range: -25°C to +85°C

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Blue Fiberglass PCB
• Connection Pads: VIN+, GND, VOUT+, GND Through-Hole / Castellated Edge Pads

Dimensions:

• Length: 22 mm
• Width: 11 mm
• Height: 3.6 mm
• Weight: ~1.5 g

Pinout and Wiring:

• VIN+ / GND (Input Side): Connect 2.5V–4.2V DC positive and negative battery leads.
• VOUT+ / GND (Output Side): Regulated 5V, 8V, 9V, or 12V DC output.
• Pads A & B: Bridge (1) or unbridge (0) with a soldering iron while powered off to select 5V (0,0), 8V (0,1), 9V (1,0), or 12V (1,1).

Datasheet Reference:

• Controller Architecture: High-Frequency Current-Mode Step-Up Boost Regulator with Resistive Divider Jumper Matrix

Commonly Used in:

• 3.7V LiPo to 9V Multimeter & Wireless Microphone Battery Conversions
• Compact 3.7V to 12V Sensor, Relay, and RF Transmitter Supplies
• Wearable 5V Arduino / ESP32 Battery Packs
• RC Receiver and FPV Camera 5V/9V/12V Power Rails

Applications:

• Replaces Vibration-Prone Trimmer Potentiometers with fixed, shock-proof 5V, 8V, 9V, or 12V solder-jumper settings in mobile robotics and drones.
• Steps up a single 3.7V LiPo pouch cell to 9V or 12V inside handheld test instruments and guitar active pickups.
• Saves standby battery life in remote IoT sensors by disconnecting the onboard indicator LED jumper.

Equivalent Models:

• MT3608 DC-DC 2A Adjustable Step-Up Boost Converter Module: Potentiometer-adjustable 5V–28V boost module.
• 1.5V to 5V DC-DC Boost Converter Module: Fixed 5V boost converter optimized for 0.9V–3.7V AA/AAA/Li-Ion inputs.

Package Includes:

• 1 × 3.7V to 5V/8V/9V/12V Mini DC-DC Step-Up Boost Converter Module