STMicroelectronics LD39130SJ10R

Overview

LD39130SJ10R from STMicroelectronics is a 300 mA ultra-low-quiescent-current linear voltage regulator in Flip-chip 4-bump (0.69 × 0.69 mm, 0.4 mm pitch) package, delivering fixed 1.0 V output with ±1.0% accuracy at 25 °C, 300 mV typical dropout at 300 mA, and automatic green mode for battery-powered digital still cameras and mobile phones.

For engineers reviewing the LD39130SJ10R datasheet, LD39130SJ10R pinout, LD39130SJ10R application, or LD39130SJ10R equivalent, key selection criteria include its 1 µA green-mode quiescent current, logic-controlled shutdown (<0.1 µA off-mode), ceramic-capacitor compatibility (≥330 nF), thermal/short-circuit protection, and operation across –40 °C to 125 °C junction temperature.

Technical Context

The LD39130SJ10R implements an adaptive dual-mode control architecture: it autonomously switches between ultra-low-power green mode (1 µA IQ) at light loads and high-speed normal mode (45 µA IQ, fast transient response) when load exceeds ~2 mA. Its internal bandgap reference, error amplifier, and GM logic circuitry enable seamless mode transition without external components.

Unlike standard LDOs, it integrates an output discharge MOSFET (RON = 100 Ω) activated during shutdown, ensuring rapid VOUT collapse, and features internal soft-start (100 µs turn-on time) to limit inrush current-critical for systems with large downstream capacitance and strict power sequencing requirements.

Key Specifications

Pinout & Package

LD39130SJ10R uses a Flip-chip 4-bump package (0.69 × 0.69 mm, 0.4 mm pitch), optimized for minimal PCB footprint and thermal performance (R_thJA = 130 °C/W). Unlike the DFN6 variant, this CSP version lacks GM and ADJ pins and operates exclusively in automatic green mode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B102MR-G and RT9080L-10GJ5, LD39130SJ10R uniquely combines 300 mA capability, 1 µA green-mode IQ, automatic load-triggered mode switching, and integrated output discharge-all in a 0.69 × 0.69 mm CSP, enabling superior battery life and system-level reliability in ultra-compact portable designs.

Availability

LD39130SJ10R is available at Aetrix Electronics and suitable for mobile phone power rails, digital still camera core supplies, cordless phone baseband systems, and portable media player audio codecs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD39130SJ10R 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 sensing solutions for automotive, industrial, and consumer markets.

The LD39130S family targets ultra-low-power portable electronics, with the SJ10R variant specifically engineered for space-constrained, battery-operated imaging and communication devices demanding minimal IQ and robust thermal behavior.

FAQ

What is the minimum input voltage required for LD39130SJ10R to regulate 1.0 V output at 300 mA?

The minimum input voltage is 1.4 V per datasheet absolute maximum ratings and electrical characteristics. At 300 mA load, the 300 mV typical dropout requires VIN ≥ 1.3 V theoretically, but ST specifies 1.4 V as the guaranteed operational lower limit across temperature and process variation-ensuring regulation stability and protection circuit functionality.

Does LD39130SJ10R require an external resistor divider to set output voltage?

No. LD39130SJ10R is a fixed-output variant delivering 1.0 V; it does not include an ADJ pin. The ADJ functionality exists only on the DFN6-packaged LD39130S (not SJ suffix), and the Flip-chip SJ version has only four terminals: IN, OUT, EN, and GND-eliminating any external feedback requirement.

How does the automatic green mode switch between operating states without external control?

Green mode switching is fully internal: the device monitors output current via on-die sense circuitry. When load drops below ~1–2 mA, it transitions to green mode (1 µA IQ); above ~10 mA, it reverts to normal mode (45 µA IQ) for faster transient response. No external signal or resistor is needed-the SJ10R version has no GM pin and performs this autonomously.

Can LD39130SJ10R be used with a 100 nF output capacitor?

No. The datasheet specifies minimum C_OUT = 330 nF (0.33 µF) for stability, with recommended values up to 22 µF. A 100 nF capacitor falls below the stability boundary shown in Figure 32 (Stability Plan vs. C_OUT/ESR) and risks oscillation or poor transient response-especially under load steps or temperature extremes.