STMicroelectronics LD39020DTPU33R

Overview

LD39020DTPU33R from STMicroelectronics is a 3.3 V, 200 mA ultra-low-dropout linear regulator with 200 mV typical dropout at full load, ±2.0 % output voltage tolerance at 25 °C, and 20 µA typical quiescent current at no load. It features logic-controlled enable, internal soft-start, thermal/overcurrent protection, and supports ceramic output capacitors as low as 0.47 µF - deployed in battery-powered mobile phones, tablets, and digital still cameras.

For engineers reviewing the LD39020DTPU33R datasheet, LD39020DTPU33R pinout, LD39020DTPU33R application, or LD39020DTPU33R equivalent, key selection criteria include dropout performance at 200 mA, shutdown current < 0.1 µA, PSRR (80 dB @ 1 kHz), output accuracy over temperature, and compatibility with space-constrained DFN4 1x1 or SOT23-5L PCB layouts.

Technical Context

The LD39020DTPU33R uses a bandgap-referenced error amplifier and PMOS pass transistor to deliver stable 3.3 V output across 1.5–5.5 V input range. Its internal soft-start limits inrush current by controlling output ramp-up over ~100 µs without external components.

Enable logic (EN pin) directly controls regulator state: high enables regulation, low forces shutdown with < 1 µA standby current. An optional integrated discharge MOSFET (present in "D" variants like this part) actively pulls VOUT to GND during disable, eliminating residual hold-up voltage.

Key Specifications

Pinout & Package

LD39020DTPU33R is available in DFN4 1x1 (1.0 mm × 1.0 mm, 0.4 mm height) and SOT23-5L packages. Both are RoHS-compliant, thermally enhanced, and optimized for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B332MR-G and BD39020MUV-E2, LD39020DTPU33R uniquely combines ultra-low dropout (200 mV), sub-0.1 µA shutdown current, and integrated output discharge - making it optimal for battery-critical, fast-wake architectures where residual voltage must be cleared.

Availability

LD39020DTPU33R is available at Aetrix Electronics and suitable for mobile phones, tablets, and digital still cameras requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LD39020DTPU33R 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, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

LD39020 belongs to ST's high-accuracy, ultra-low-I_Q LDO family - engineered specifically for space- and energy-constrained portable electronics where battery life, thermal density, and fast enable/disable response are critical.

FAQ

What is the minimum input voltage required for LD39020DTPU33R to regulate 3.3 V output?

The LD39020DTPU33R requires VIN ≥ VOUT + VDROP. With 200 mV typical dropout at 200 mA, it regulates stably from 3.5 V input. Absolute minimum VIN is 1.5 V, but below 3.5 V, output drops linearly - e.g., at VIN = 3.4 V, VOUT ≈ 3.2 V under full load. Always maintain ≥3.5 V for nominal 3.3 V operation.

Can LD39020DTPU33R be used with a 0.22 µF output capacitor?

No. The datasheet specifies a minimum 0.47 µF ceramic capacitor for guaranteed stability across temperature, load, and input voltage. Using 0.22 µF risks oscillation or poor transient response, especially above 85 °C or with >100 mA load steps. Figure 17 confirms instability below 0.47 µF in the ESR–capacitance stability region.

Does LD39020DTPU33R include thermal shutdown protection?

Yes. It integrates thermal shutdown that activates at 160 °C junction temperature, with 20 °C hysteresis. Once triggered, regulation halts until die cools to ~140 °C. This protection is independent of current limit and operates under all load and ambient conditions - confirmed in Table 5 and Section 4 (Maximum Ratings).

Is the EN pin 5 V tolerant when VIN = 3.3 V?

Yes. The EN pin accepts logic-high signals up to 7 V regardless of VIN, per Table 2 (Absolute Maximum Ratings). With VIN = 3.3 V, applying 5 V to EN is safe and ensures robust noise immunity. Input leakage remains ≤100 nA (Table 5), so no level-shifting is needed for standard GPIO interfaces.