LD39020DTPU18R

Overview

The LD39020DTPU18R is a fixed-output linear regulator IC manufactured by STMicroelectronics. It provides a nominal output voltage of 1.8 V with a guaranteed maximum output current of 200 mA. The device operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load. Quiescent current is specified as 40 µA maximum at no load, while standby current drops below 1 µA in shutdown mode. The component utilizes a DFN4 1x1 surface-mount package and maintains stability using ceramic output capacitors.

Feature Summary

• Logic-controlled electronic shutdown enables ultra-low power consumption when disabled
• Internal soft-start circuit limits startup inrush current without external components
• Integrated MOSFET discharges the output capacitor upon disable for rapid state transition
• High supply voltage rejection ratio ensures stable operation under noisy input conditions

Applications

• Mobile phones
• Tablets
• Digital still cameras (DSC)
• Cordless phones and similar battery-powered systems
• Portable media players

Procurement Notes

Verify the specific suffix 'DT' confirms the inclusion of the auto-discharge feature on this variant. Confirm the package type matches the required footprint. Check RoHS compliance status against local regulations. Ensure the ordering code corresponds to the correct output voltage tolerance level. Validate that the manufacturer's part number aligns with the requested specifications before finalizing orders.

Selection Notes

Select this component for applications requiring minimal PCB area due to its compact DFN4 1x1 package. Choose this regulator when low quiescent current is critical for extending battery life in portable devices. Consider this part if internal soft-start functionality is needed to manage power supply ramp-up. Verify that the required output voltage tolerance meets the ±2% specification inherent to this standard version.

Part Context

This device belongs to the LD39020 family of high-accuracy voltage regulators designed for space-constrained electronics. The series offers various fixed output voltages ranging from 0.8 V to 5.0 V. It is engineered for low-noise performance and compatibility with small ceramic capacitors. The family supports both DFN4 1x1 and SOT23-5L packages to accommodate different design constraints.

Replacement Considerations

LD39020ADTPU18R: Offers tighter voltage tolerance but retains the same discharge feature.

FAQ

Does the LD39020DTPU18R include an output discharge function?

Yes, the 'DT' suffix indicates the device includes an integrated MOSFET that actively discharges the output capacitor when the enable pin is driven low.

What is the minimum recommended output capacitance for stability?

While the device remains stable with a minimum effective capacitance of 220 nF, a minimum output capacitor of 0.47 µF is recommended to ensure stability across all operating conditions.