STMicroelectronics LD39130SJ18R

Overview

LD39130SJ18R from STMicroelectronics is a 300 mA ultra-low-quiescent-current linear voltage regulator with fixed 1.8 V output, housed in a Flip-chip 4-bump 0.69 × 0.69 mm package. It delivers ±1.0% output accuracy at 25 °C, 300 mV typical dropout at 300 mA, and operates from 1.4 V to 5.5 V input. Its automatic green mode reduces quiescent current to 1 µA under light load, making it ideal for battery-powered mobile phones and portable media players.

For engineers reviewing the LD39130SJ18R datasheet, LD39130SJ18R pinout, LD39130SJ18R application, or LD39130SJ18R equivalent, key selection criteria include dropout voltage at full load, green-mode transition thresholds (1–2 mA), output discharge resistance (100 Ω), thermal shutdown threshold (160 °C), and compatibility with 330 nF ceramic output capacitors.

Technical Context

The LD39130SJ18R implements an adaptive dual-mode control architecture: normal mode enables fast transient response (≤100 µs turn-on time) for dynamic loads, while green mode activates below ~2 mA load to minimize IQ to 1 µA. The internal bandgap reference and error amplifier maintain tight output regulation across –40 °C to 125 °C junction temperature.

It integrates logic-controlled shutdown (VEN), output discharge MOSFET (RON = 100 Ω), current foldback protection (ISC = 50 mA), and thermal shutdown (TSHDN = 160 °C, 20 °C hysteresis). Unlike the DFN6 version, the LD39130SJ variant lacks GM and ADJ pins - green mode is always active and output is fixed at 1.8 V.

Key Specifications

Pinout & Package

LD39130SJ18R uses the ultra-compact Flip-chip 4-bump package (0.69 × 0.69 mm, 0.4 mm pitch), optimized for space-constrained portable designs. No external passive components are required for stability beyond a 330 nF ceramic output capacitor.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Compared with XC6210B182MR-G and RT9080L-18GJ5, LD39130SJ18R uniquely combines ultra-low 1 µA green-mode IQ, integrated output discharge, and 100 µs soft-start - critical for energy-efficient portable systems requiring precise power sequencing and minimal leakage.

Availability

LD39130SJ18R is available at Aetrix Electronics and suitable for mobile phone power management, digital still camera core supply, and cordless phone baseband IC applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LD39130SJ18R 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 automotive, industrial, and consumer markets.

LD39130SJ18R belongs to ST's high-accuracy, ultra-low-IQ LDO family targeting battery-powered portable electronics - engineered specifically for extended runtime, minimal footprint, and seamless integration into space- and power-constrained designs.

FAQ

What is the minimum input voltage required for LD39130SJ18R to regulate 1.8 V output?

The LD39130SJ18R requires a minimum input voltage of 1.4 V, but to sustain 1.8 V output at 300 mA load, VIN must exceed VOUT + VDROP = 1.8 V + 0.3 V = 2.1 V. At lighter loads, regulation is maintained down to VIN = 1.8 V + 100 mV (per datasheet dropout definition), enabling operation from partially discharged single-cell batteries.

Does LD39130SJ18R require an external capacitor on the EN pin for noise immunity?

No external capacitor is required on the EN pin. The device features internal RC filtering on the enable input, and the datasheet specifies logic thresholds (0.4 V low, 1.0 V high) with 100 nA input current - making it inherently robust against typical PCB-level noise. Layout best practice remains routing EN away from noisy signals and using a short, direct trace to the controller GPIO.

Can LD39130SJ18R be used with a 100 nF output capacitor?

No. The LD39130SJ18R requires a minimum output capacitance of 330 nF (ceramic, X5R/X7R) for loop stability, as confirmed in Section 5 of DS9919 Rev 8. Using 100 nF risks oscillation or excessive overshoot during load transients. The recommended range is 0.33 µF to 22 µF, with ESR <10 mΩ at 100 kHz.

Is the green mode function user-controllable on LD39130SJ18R?

No. LD39130SJ18R is the Flip-chip (CSP) variant and has green mode permanently enabled - it lacks the GM pin present on the DFN6 version (LD39130S). The device autonomously switches between 1 µA green mode and 45 µA normal mode based on load current (thresholds: 1–2 mA), with no external configuration required.