STMicroelectronics LD59030DTPU12R

Overview

LD59030DTPU12R from STMicroelectronics is a 1.2 V fixed-output, 300 mA ultra-low-dropout linear regulator (LDO) in DFN4 1×1 mm package, featuring 135 mV typical dropout at 300 mA, ±1% output voltage accuracy at 25 °C, and 28 µA typical quiescent current at no load. It delivers stable power to low-power microcontrollers and sensors in space-constrained battery-powered systems such as wearables and IoT edge nodes.

For engineers reviewing the LD59030DTPU12R datasheet, LD59030DTPU12R pinout, LD59030DTPU12R application, or LD59030DTPU12R equivalent, key selection criteria include dropout performance at 300 mA load, thermal behavior up to 125 °C junction temperature, compatibility with 0.47 µF ceramic output capacitors, and logic-controlled shutdown with sub-0.03 µA standby current.

Technical Context

The LD59030DTPU12R integrates a bandgap reference, error amplifier, and PMOS pass transistor in a closed-loop regulation architecture optimized for low-noise, high-PSRR operation. Its internal soft-start circuit limits inrush current by controlling output ramp-up over 145 µs without external components.

It features an optional integrated discharge MOSFET activated during EN low, enabling rapid VOUT discharge to prevent residual voltage hold-up in power sequencing-critical applications. Thermal protection triggers at 160 °C with 20 °C hysteresis, and current fold-back limits short-circuit current to 120–170 mA.

Key Specifications

Pinout & Package

LD59030DTPU12R uses the DFN4 1×1 mm package with exposed thermal pad (tied to GND), offering 140 °C/W junction-to-ambient thermal resistance. The compact footprint minimizes PCB area while enabling efficient heat dissipation in thin-profile designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B122MR-G and RT9013-12GB, LD59030DTPU12R provides superior dropout (135 mV), lower I_Q (28 µA), smaller DFN4 1×1 mm footprint, and integrated discharge/soft-start-making it optimal for space- and energy-constrained designs requiring robust power sequencing.

Availability

LD59030DTPU12R is available at Aetrix Electronics and suitable for wearable electronics, industrial sensor nodes, smart meter backup supplies, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LD59030DTPU12R 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-I_Q LDO family engineered specifically for battery-powered and thermally demanding applications where minimal dropout, tight voltage tolerance, and reliable shutdown behavior are mandatory.

FAQ

What is the minimum input voltage required for 1.2 V output at 300 mA load?

The LD59030DTPU12R requires VIN ≥ VOUT + VDROP = 1.2 V + 0.135 V = 1.335 V minimum at 25 °C. At −40 °C to +85 °C, max dropout rises to 220 mV, so VIN ≥ 1.42 V is recommended for full-load operation across temperature. Absolute minimum VIN per datasheet is 1.5 V.

Can LD59030DTPU12R operate with a 0.47 µF output capacitor?

Yes. The device is explicitly characterized and stable with 0.47 µF ceramic capacitors (X5R/X7R), as confirmed in Table 5 and Figure 15 of DS12219. This enables ultra-compact designs and eliminates reliance on larger, less reliable capacitor types.

Does LD59030DTPU12R include thermal shutdown protection?

Yes. It incorporates thermal shutdown at 160 °C junction temperature with 20 °C hysteresis, as specified in Table 5. This protects against sustained overload or poor PCB thermal design while allowing automatic recovery once temperature falls below 140 °C.

Is the EN pin 5 V tolerant?

No. The EN pin absolute maximum rating is 7 V, but its logic thresholds are defined for VIN = 1.5–5.5 V operation. For direct connection to 5 V logic, a series resistor is recommended to limit current if VEN exceeds VIN, though typical use assumes EN driven from same supply domain as VIN.