NCP4680DSQ12T1G

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The NCP4680DSQ12T1G is a CMOS linear voltage regulator providing a fixed 1.2 V output with a maximum current capability of 150 mA. It operates within an input voltage range of 1.40 V to 5.25 V and maintains an output voltage accuracy of ±1.0%. The device features a typical supply current of 50 µA, dropout voltage of 0.25 V at full load, and high power supply rejection ratio (PSRR) of 75 dB at 1 kHz. It includes fold-back current limit protection and an active-high Chip Enable function for power saving.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Includes an auto discharge transistor between the output and ground to rapidly dissipate stored energy when disabled.
• Features fold-back current limit protection that minimizes power loss during overcurrent or short circuit conditions.
• Designed for stability with small ceramic capacitors, requiring only 0.1 µF on both input and output terminals.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery-powered portable equipment
• Networking and communication equipment
• Cameras, DVRs, set-top boxes, and camcorders
• Home appliances

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'SQ' confirms the inclusion of the output discharger feature and SC-70 package. Confirm RoHS compliance status as indicated in the ordering information. Ensure the datasheet revision matches the required design specifications before finalizing procurement.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a low-noise, compact LDO with fast shutdown response is required. The SC-70 package suits space-constrained designs. Verify that the minimum startup load requirements are met for the 1.2 V version due to the fold-back protection characteristics.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the NCP4680 series of 150 mA low-dropout regulators manufactured by onsemi. The series offers various fixed output voltages and packages including XDFN4, SC-70, and SOT-23-5. The DSQ variant specifically denotes the SC-70 package with the integrated output discharge function.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct replacements include other NCP4680 variants with different output voltages or packages, such as NCP4680DSQ15T1G or NCP4680DSQ18T1G, provided the voltage requirement differs. Cross-family replacements require matching electrical parameters and pin compatibility.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the function of the 'D' suffix in the part number?

The 'D' indicates that the device includes an internal transistor connected between the output and ground to actively discharge the output capacitor when the Chip Enable pin is deactivated.

How does the fold-back current limit affect startup?

For the 1.2 V version, the fold-back protection may cause issues if the initial load is too light. It is recommended to ensure the equivalent load resistance is at least double the minimum calculated value during startup.