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ME4894-G / ME4925 / ME4946 / ME4946A Synchronous Buck Converter IC — SOP-8, 95% Efficiency (10-Pack)
ME4894-G / ME4925 / ME4946 / ME4946A Synchronous Buck Converter IC SOP-8, 95% Efficiency (10-Pack)
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ME4894-G / ME4925 / ME4946 / ME4946A Synchronous Buck Converter IC — SOP-8, 95% Efficiency (10-Pack)
The ME4894-G, ME4925, ME4946, and ME4946A are high-efficiency synchronous step-down (buck) DC-DC converter ICs in SOP-8 SMD packages. Integrating both high-side and low-side power MOSFETs with a current-mode PWM controller, they deliver up to 95% conversion efficiency with minimal external components. Full protection including OCP, OVP, and thermal shutdown makes them suitable for consumer electronics power supply design and repair.
Variant Comparison
| Part Number | Input Voltage | Output Current | Key Feature |
|---|---|---|---|
| ME4894-G | 4.5–18V | 3A | Wide input, high current |
| ME4925 | 4.5–25V | 2A | Higher input voltage range |
| ME4946 | 4.5–18V | 4A | High current output |
| ME4946A | 4.5–18V | 4A | Improved soft-start, lower EMI |
Key Specifications (All Variants)
| Parameter | Value |
|---|---|
| Package | SOP-8 (SMD) |
| Topology | Synchronous buck (integrated MOSFETs) |
| Peak Efficiency | Up to 95% |
| Switching Frequency | ~300–500kHz (variant dependent) |
| Protection | OCP, OVP, thermal shutdown, soft-start, UVLO |
| Output Voltage | Adjustable (external resistor divider) |
| Operating Temperature | -40°C to +85°C |
| Quantity | 10 pieces |
Why Choose ME4894/ME4925/ME4946?
- 95% peak efficiency — synchronous rectification eliminates freewheeling diode loss
- Integrated MOSFETs — no external power transistors needed, minimal BOM
- Full protection suite — OCP/OVP/thermal/UVLO/soft-start for robust operation
- SOP-8 compact package — direct replacement in existing consumer electronics PCB footprints
- 10-pack value — sufficient for multiple designs and repair stock
Compatible With / Common Use Cases
- Consumer electronics power supply: 12V to 5V/3.3V step-down for set-top boxes, routers, and smart speakers
- LCD monitor power board: Logic supply rail step-down (12V→3.3V)
- Industrial embedded supply: 24V to 5V/3.3V for PLC and industrial controller logic supply
- PCB repair: Replacement for failed synchronous buck IC on consumer electronics boards
- Arduino/ESP32 power supply: Efficient 5V or 3.3V supply from 12V adapter
Frequently Asked Questions
Q: How do I set the output voltage for ME4946?
A: Use a resistor divider from Vout to the FB pin to GND. Vout = Vref × (1 + R1/R2), where Vref is typically 0.8V for ME4946. For 3.3V output: R1=31.25kΩ, R2=10kΩ. For 5V output: R1=52.5kΩ, R2=10kΩ. Use 1% tolerance resistors for accurate output voltage.
Q: Can ME4946 replace MP2307 or XL4016 in an existing design?
A: Only if the pinout matches. SOP-8 buck converter ICs are not universally pin-compatible. Always compare the datasheet pinout of the original IC with ME4946 before substituting. Verify input voltage range, output current, and switching frequency compatibility.
Q: What inductor should I use with ME4946 for 12V to 5V at 3A?
A: For 12V input, 5V output, 3A load at 400kHz: L = (Vin−Vout)×D/(f×ΔIL) where D=5/12=0.42, ΔIL=30%×3A=0.9A. L≈(12−5)×0.42/(400kHz×0.9A)≈8.2μH. Use a 10μH shielded inductor rated for ≥4A saturation current.
Package Contents
- 10× ME4894-G / ME4925 / ME4946 / ME4946A Synchronous Buck Converter IC (SOP-8) — variant as selected
