STMicroelectronics LD59030DTPU30R

Overview

LD59030DTPU30R from STMicroelectronics is a 3.0 V fixed-output, 300 mA ultra-low-dropout linear voltage regulator in DFN4 1×1 mm package, featuring 135 mV typical dropout at 300 mA, ±1 % output voltage accuracy at 25 °C, 75 dB PSRR at 1 kHz, and logic-controlled shutdown with 0.03 µA standby current. It delivers stable power to low-power microcontrollers and RF transceivers in space-constrained portable devices.

For engineers reviewing the LD59030DTPU30R datasheet, LD59030DTPU30R pinout, LD59030DTPU30R application, or LD59030DTPU30R equivalent, key selection considerations include dropout performance at 300 mA load, ceramic capacitor compatibility (≥0.47 µF), thermal behavior up to 125 °C junction temperature, and enable-controlled output discharge functionality.

Technical Context

The LD59030DTPU30R integrates a bandgap reference, error amplifier, and internal PMOS pass transistor with fold-back current limiting and thermal shutdown. Its architecture supports operation from 1.5 V to 5.5 V input while maintaining regulation down to VIN − VOUT = 135 mV (typ.) at full load.

It implements an internal soft-start circuit (145 µs turn-on time) and optional output discharge MOSFET activated during EN low, both managed without external components. The device is optimized for stability with ceramic output capacitors as low as 0.47 µF and exhibits 70 µV_RMS integrated noise (10 Hz–100 kHz) at 1.8 V output.

Key Specifications

Pinout & Package

LD59030DTPU30R is housed in a thermally enhanced DFN4 1×1 mm package with exposed thermal pad connected to GND. The 4-pin layout supports minimal PCB footprint and efficient heat dissipation in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B302MR-G and RT9080A-30GB, LD59030DTPU30R provides superior dropout (145 mV vs. ≥150 mV), built-in discharge functionality, and tighter initial accuracy (±1 % vs. ±2 %), making it optimal for space-constrained, battery-sensitive designs requiring deterministic power sequencing.

Availability

LD59030DTPU30R is available at Aetrix Electronics and suitable for wearable health monitors, IoT edge nodes, automotive cabin controllers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LD59030DTPU30R 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 industrial, automotive, and consumer markets.

The LD59030 belongs to ST's high-accuracy, ultra-low-IQ LDO family targeting battery-powered and thermally constrained applications where minimal dropout, fast transient response, and integrated power management features are essential.

FAQ

What is the minimum output capacitor required for stable operation?

The LD59030DTPU30R is stable with a minimum 0.47 µF ceramic capacitor (X5R/X7R dielectric) on the output. This value ensures phase margin >45° across temperature, input voltage, and load variations per Figure 15 in DS12219. Larger values (up to 22 µF) improve transient response but are not required for stability.

Does LD59030DTPU30R include output discharge, and how is it activated?

Yes - the "D" in LD59030DTPU30R denotes the version with integrated output discharge MOSFET. It activates automatically when the EN pin is driven low, pulling VOUT to GND through a 120 Ω on-resistance path. This feature eliminates residual voltage on downstream capacitance within milliseconds, supporting safe power-down sequencing.

Can LD59030DTPU30R operate with input voltage below 1.8 V?

Yes - the LD59030DTPU30R supports input voltages as low as 1.5 V, enabling use with single-cell LiFePO₄ (2.5–3.65 V) or NiMH (0.9–1.4 V/cell, stacked) batteries. At VIN = 1.5 V, it regulates 3.0 V output only if dropout condition is met (i.e., VIN ≥ VOUT + VDROP ≈ 3.145 V), so it operates in dropout mode below that threshold and cannot maintain regulation.

What is the thermal pad connection requirement for reliable operation?

The exposed thermal pad on the DFN4 1×1 package must be soldered to a dedicated GND copper pour on the PCB. Per DS12219, this connection establishes the primary thermal path and achieves R_thJA = 140 °C/W. Leaving the pad unconnected or floating increases junction temperature by >30 °C under 300 mA load and risks thermal shutdown activation.