AP3211KTR-G1 GCI 1.5A Step-Down DC-DC Converter SOT23-6 – 4.5V-18V Input
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AP3211KTR-G1 (GCI) 1.4MHz 1.5A Step-Down DC-DC Converter in SOT23-6
The AP3211KTR-G1 (marking GCI) is a current-mode PWM step-down DC-DC converter running at a fixed 1.4MHz. In a small SOT23-6 package, it drives a 1.5A load with up to 92% efficiency and excellent line and load regulation, from a 4.5V to 18V input to an adjustable 0.81V to 15V output.
The device integrates a low on-resistance N-channel power MOSFET switch, so the buck stage needs only a few external parts. Current-mode control gives a fast transient response and cycle-by-cycle current limiting. Use it to replace a failed AP3211 on a control board or PCB assembly that derives a local low-voltage rail from a 12V supply.
Built-in Protections
- Overcurrent protection with cycle-by-cycle current limiting.
- Thermal shutdown against overheating.
- Undervoltage lockout (UVLO) to keep the converter off when the input is too low.
- Overvoltage protection on the output.
- Soft-start to limit inrush current at power-up.
Signs of a Failed Step-Down Converter
- Missing output voltage on the rail the converter supplies.
- Output voltage too low, too high or unstable under load.
- Chip running hot, or a visible crack or burn mark on the package.
- Input rail pulled down or shorted to ground at the converter.
AP3211KTR-G1 Specifications
| Parameter | Value |
|---|---|
| Part Number | AP3211KTR-G1 |
| Marking Code | GCI |
| Type | Current-mode PWM step-down DC-DC converter |
| Input Voltage | 4.5V to 18V |
| Output Voltage | Adjustable, 0.81V to 15V |
| Output Current | 1.5A |
| Switching Frequency | 1.4MHz (fixed) |
| Efficiency | Up to 92% |
| Power Switch | Integrated low on-resistance N-channel MOSFET |
| Protections | OCP, thermal shutdown, UVLO, OVP, soft-start |
| Package | SOT23-6 |
| Applications | LCD TV, digital photo frames, portable DVD, PCB assemblies |
| Condition | New |
FAQ
What does the GCI marking mean?
GCI is the marking code printed on the AP3211KTR-G1 package. Compare it with the chip on your board before replacing it.
How is the output voltage set?
The output is adjustable from 0.81V to 15V with an external resistor divider. When you replace the chip, keep the original divider on the board and the output stays the same.
Can it run from a 12V supply?
Yes. The input range is 4.5V to 18V, which covers 5V and 12V supplies.
Do you sell it in volume?
Yes. Email us with the quantity you need and we will send a quote.
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Need AP3211KTR-G1 converters for a repair bench? Email contact@lys-sz.com for volume pricing.
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