STMicroelectronics LD39020DTPU30R

Overview

LD39020DTPU30R from STMicroelectronics is a 3.0 V, ±2% tolerance, 200 mA ultra-low-dropout linear regulator in DFN4 1x1 package, featuring 200 mV typical dropout at full load, 20 µA typical quiescent current, and logic-controlled enable. It delivers stable power to core logic rails in space-constrained portable devices such as digital still cameras and cordless phones.

For engineers reviewing the LD39020DTPU30R datasheet, LD39020DTPU30R pinout, LD39020DTPU30R application, or LD39020DTPU30R equivalent, this page provides verified electrical specifications, validated pin functions, confirmed thermal performance (R_thJA = 250 °C/W), real-world stability requirements (C_OUT ≥ 0.47 µF ceramic), and documented soft-start/enable behavior - all critical for battery-powered LDO selection.

Technical Context

The LD39020DTPU30R integrates a bandgap reference, error amplifier, and PMOS pass transistor in a fixed-output configuration with internal soft-start and logic-controlled shutdown. Its architecture enables stable regulation down to 1.5 V input while maintaining <200 mV dropout across temperature and load.

It supports optional output discharge via an integrated NMOS switch (enabled in DT variants like this part), operates over –40 °C to +125 °C junction temperature, and achieves 80 dB PSRR at 1 kHz with only 0.47 µF ceramic output capacitance - eliminating need for bulk electrolytics.

Key Specifications

Pinout & Package

LD39020DTPU30R is housed in a 1 mm × 1 mm, 0.4 mm height DFN4 1x1 package with wettable flanks and exposed thermal pad connected to GND. The package enables high-density layout and efficient heat dissipation in thin-profile handhelds.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with XC6210B302MR-G and RT9013-30GB, LD39020DTPU30R uniquely combines sub-200 mV dropout, 80 dB PSRR, integrated enable, soft-start, and output discharge - making it optimal for compact, battery-critical systems demanding both efficiency and robustness.

Availability

LD39020DTPU30R is available at Aetrix Electronics and suitable for digital still cameras, cordless phone base stations, and portable media players requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for LD39020DTPU30R includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

LD39020 belongs to ST's high-accuracy, ultra-low-quiescent-current LDO family, engineered specifically for space- and energy-constrained portable electronics where battery life, thermal density, and noise immunity are design-critical.

FAQ

What is the minimum output capacitor required for stable operation?

The LD39020DTPU30R is stable with a minimum 0.47 µF X5R or X7R ceramic capacitor on the output. This value ensures phase margin >45° across –40 °C to +125 °C and full load range. Using smaller capacitors risks oscillation; larger values (up to 22 µF) improve transient response but are not required.

Does LD39020DTPU30R include output discharge functionality?

Yes. The "DT" suffix in LD39020DTPU30R indicates inclusion of an internal NMOS discharge switch between VOUT and GND. When EN is pulled low, this MOSFET actively discharges the output capacitor, reducing VOUT to near-zero within microseconds - essential for safe rail sequencing and fast system resets.

Can LD39020DTPU30R operate from a 1.8 V input?

No. The absolute minimum input voltage is 1.5 V, but regulation requires VIN ≥ VOUT + V_DROP. At 200 mA load, V_DROP is up to 350 mV over temperature, so 1.8 V input cannot sustain 3.0 V output. Minimum functional input is ~3.35 V under worst-case conditions - verify against actual load and thermal environment.

How does thermal performance differ between DFN4 1x1 and SOT23-5L packages?

The DFN4 1x1 package has R_thJA = 250 °C/W (with proper thermal pad soldering), while the SOT23-5L variant has R_thJA = 255 °C/W. Both offer identical electrical specs, but the DFN4's smaller footprint and lower junction-to-ambient resistance make it preferable for thermally dense layouts where PCB area and thermal headroom are constrained.