STMicroelectronics LD39130SJ41R

Overview

LD39130SJ41R from STMicroelectronics is a 4.1 V fixed-output, 300 mA ultra-low-dropout linear regulator with automatic green mode, 300 mV typical dropout at full load, ±1.0% output accuracy at 25 °C, and 1 µA quiescent current in green mode-designed for battery-powered digital still cameras and portable media players requiring stable low-noise voltage regulation.

For engineers reviewing the LD39130SJ41R datasheet, LD39130SJ41R pinout, LD39130SJ41R application, or LD39130SJ41R equivalent, this page delivers verified package mapping (Flip-chip 4-bump), validated pin functions (EN, GM, IN, OUT, GND), confirmed thermal shutdown (160 °C), and real-world green-mode transition thresholds (1–2 mA).

Technical Context

The LD39130SJ41R implements an adaptive dual-mode control architecture: green mode enables ultra-low IQ (1 µA) during light loads (<2 mA), while automatically switching to normal mode (45 µA IQ, fast transient response) above 10 mA. Its internal bandgap reference and error amplifier maintain ±1.0% output accuracy across -40 °C to 125 °C junction temperature.

It integrates logic-controlled shutdown (VEN < 0.4 V disables output, drawing ≤0.1 µA), internal soft-start (100 µs turn-on time), and output discharge path (100 Ω pull-down when disabled). The Flip-chip 4-bump package lacks GM and ADJ pins-green mode is always active and output is fixed at 4.1 V.

Key Specifications

Pinout & Package

LD39130SJ41R uses the ultra-compact Flip-chip 4-bump package (0.69 × 0.69 mm, 0.4 mm pitch), optimized for space-constrained mobile applications. Unlike the DFN6 variant, this version omits GM and ADJ pins-green mode is always enabled and output is factory-fixed at 4.1 V.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, fixed-output LDO applications.

Compared with XC6210B412MR-G and RT9013-41GB, LD39130SJ41R uniquely combines 1 µA green-mode IQ, integrated output discharge, and guaranteed 300 mV dropout-making it optimal for battery runtime and system-level power sequencing in space-constrained portable electronics.

Availability

LD39130SJ41R is available at Aetrix Electronics and suitable for digital still cameras, portable media players, and cordless phone handsets requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LD39130SJ41R 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.

LD39130SJ41R belongs to ST's LD39xx ultra-low-IQ LDO family, engineered specifically for battery-powered portable electronics demanding minimal standby power, small footprint, and high accuracy under wide input/output conditions.

FAQ

What is the minimum input voltage required for LD39130SJ41R to regulate 4.1 V output?

The LD39130SJ41R requires VIN ≥ VOUT + VDROP = 4.1 V + 0.3 V = 4.4 V for full 300 mA regulation. However, it remains functional down to 1.4 V input-just unable to sustain 4.1 V output below that headroom. At 4.4 V input, dropout is 300 mV; at 5.5 V input, line regulation is 0.02 %/V (typ.) in normal mode.

Does LD39130SJ41R require an external capacitor on the EN pin for noise immunity?

No external EN capacitor is required. The EN pin has built-in hysteresis and accepts standard 1.8 V/3.3 V logic levels directly. Its input leakage is only 100 nA, and logic thresholds are specified as VIL ≤ 0.4 V and VIH ≥ 1.0 V across -40 °C to 125 °C-ensuring robust noise margin without added components.

Can LD39130SJ41R be used with a 330 nF ceramic output capacitor?

Yes-ST explicitly qualifies stability with COUT ≥ 330 nF (0.33 µF) X7R/X5R ceramics. The device's control loop is optimized for low-ESR ceramics, and Figure 32 in DS9919 confirms stability across 0.33–22 µF with ESR ≤ 4 Ω. Using 330 nF reduces board area and cost while maintaining 100 µVRMS noise performance.

How does the green mode transition behave under temperature variation?

Green-to-normal mode threshold shifts from 1 mA at -40 °C to 2 mA at 125 °C (Figure 14), while normal-to-green drops from 2 mA to 1 mA over the same range. This hysteresis prevents oscillation during thermal cycling. Quiescent current remains ≤4 µA in green mode across full -40 °C to 125 °C operating range (Figure 17).