LD39020DTPU33R

Overview

The LD39020DTPU33R is a fixed-output linear regulator IC from STMicroelectronics, providing a stable 3.3 V output with a maximum current of 200 mA. It 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. The device incorporates logic-controlled electronic shutdown, reducing standby current to below 0.1 µA. It includes internal soft-start, constant current limiting, and thermal protection. Designed for space-constrained applications, it utilizes a DFN4 1x1 package and supports ceramic capacitors as small as 0.47 µF.

Feature Summary

• Ultra-low quiescent current consumption with logic-controlled shutdown capability
• Internal soft-start circuit limits inrush current during startup
• Integrated output discharge MOSFET for rapid capacitor discharge upon disable
• High power supply rejection ratio (PSRR) for low noise performance

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, as this distinguishes it from standard versions. Ensure the ordering code matches the required tolerance level, as the 'D' variant specifies ±2% accuracy at 25 °C. Confirm the package type corresponds to the DFN4 1x1 footprint requirements for your PCB layout. Check RoHS compliance status if environmental regulations apply to your deployment.

Selection Notes

Select this component when minimizing board space is critical due to its compact DFN4 1x1 packaging. It is suitable for designs requiring precise output voltage regulation with tight tolerance specifications. Consider the internal soft-start feature if managing startup inrush currents is necessary for system stability. Verify that the application environment stays within the specified -40 °C to 125 °C operating temperature range.

Part Context

This part belongs to the LD39020 family of high-accuracy voltage regulators designed for low-power portable electronics. The series offers various output voltages and packages, including SOT23-5L. The LD39020DTPU33R specifically targets applications needing efficient power management with minimal static current draw, making it ideal for battery-operated devices where extending runtime is a priority.

Replacement Considerations

LD39020TPU33R: Identical electrical characteristics but lacks the auto-discharge feature.

FAQ

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

The 'DT' suffix indicates that the device includes an integrated output discharge MOSFET, which rapidly discharges the output capacitor when the enable pin is set to a low logic level.

How does the LD39020DTPU33R handle startup inrush current?

It features an internal soft-start circuit that increases the turn-on time to approximately 100 µs, effectively controlling the inrush current without requiring external components.