STMicroelectronics LD39030SJ10R

Overview

LD39030SJ10R from STMicroelectronics is a 300 mA low-noise, low-quiescent-current LDO voltage regulator delivering 1.0 V output with ±2.0 % accuracy at 25 °C, 200 mV typical dropout at 300 mA load, and 30 μVRMS output noise (1 kHz–100 kHz). It features logic-controlled shutdown (EN pin), internal soft-start (100 μs), and operates from 1.5 V to 5.5 V input in battery-powered portable electronics.

For engineers reviewing the LD39030SJ10R datasheet, LD39030SJ10R pinout, LD39030SJ10R application, or LD39030SJ10R equivalent, key selection criteria include ultra-low IQ (20 μA typ. no-load), ceramic-capacitor compatibility (1 μF min), -40 °C to 125 °C junction temperature range, and flip-chip 4-bump package footprint for space-constrained mobile power rails.

Technical Context

The LD39030SJ10R integrates a precision 1.22 V bandgap reference, trimming network, and thermal/short-circuit protection circuitry within a flip-chip architecture. Its enable-controlled NMOS pass transistor enables fast turn-on (100 μs) and sub-1 μA off-mode current, while internal soft-start limits inrush current without external components.

Supply voltage rejection is 62 dB at 1 kHz and remains stable up to 10 kHz, supporting clean power delivery to noise-sensitive analog and RF blocks. The regulator maintains regulation across full temperature and load ranges using internal current limiting and thermal shutdown (160 °C trip with 20 °C hysteresis).

Key Specifications

Pinout & Package

LD39030SJ10R uses a flip-chip 4-bump package (0.8 mm × 0.8 mm, 0.4 mm pitch), with exposed die pad for thermal conduction and minimal PCB footprint. No external soft-start capacitor required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B102MR-G and RT9013-10GB, LD39030SJ10R uniquely combines 1.5 V minimum input, 200 mV dropout, 20 μA IQ, and EN control in a 0.8×0.8 mm flip-chip package - making it optimal for space- and energy-constrained single-cell battery systems where both efficiency and sequencing flexibility are mandatory.

Availability

LD39030SJ10R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, PDAs, and cordless phone systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for consumer electronics production.

Supply support for LD39030SJ10R 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 sensor solutions for industrial, automotive, and consumer markets.

LD39030SJ10R belongs to ST's LD39xx ultra-low-noise LDO family, engineered specifically for battery-powered portable devices demanding high PSRR, minimal quiescent current, and compact packaging without performance trade-offs.

FAQ

What is the minimum input voltage required for LD39030SJ10R to regulate 1.0 V output?

The LD39030SJ10R requires a minimum input voltage of 1.5 V to maintain regulation at 1.0 V output. This is defined by its 200 mV typical dropout voltage plus output tolerance margin. Below 1.5 V, the device enters dropout mode and output voltage tracks input minus dropout, verified across -40 °C to 125 °C junction temperature range per Table 5 in the datasheet.

Can LD39030SJ10R be used with a 1 μF ceramic output capacitor?

Yes - LD39030SJ10R is explicitly designed and characterized for stability with a 1 μF ceramic output capacitor (X5R/X7R, ESR <2 Ω at 100 kHz). Figure 21 in the datasheet confirms the stable zone for 1 μF COUT with ESR between 0.075 Ω and 1.25 Ω, eliminating need for larger or higher-ESR capacitors.

Does LD39030SJ10R include thermal protection, and how does it behave under overload?

Yes - LD39030SJ10R incorporates thermal shutdown that activates at 160 °C junction temperature with 20 °C hysteresis. Under sustained overload, it cycles between regulation and shutdown to limit die temperature. Short-circuit current is internally limited to 400 mA (typ.), preventing damage during output faults without external current-sense circuitry.

What is the actual enable pin voltage threshold for turning LD39030SJ10R on and off?

The LD39030SJ10R enable pin has a guaranteed logic-high threshold of ≥0.9 V and logic-low threshold of ≤0.4 V over -40 °C to 125 °C, per Table 5. At room temperature, typical turn-on occurs at 1.48 V and turn-off at 1.35 V, providing robust noise immunity against 1.2 V or 1.8 V GPIO signals without external pull-ups or level shifters.