STMicroelectronics LD39130SJ30R

Overview

LD39130SJ30R from STMicroelectronics is a 3.0 V fixed-output, 300 mA ultra-low-dropout linear regulator in Flip-chip 4-bump (0.69 × 0.69 mm, 0.4 mm pitch) package, featuring 300 mV typical dropout at full load, ±1.0% output voltage accuracy at 25 °C, and automatic green mode for sub-1 µA quiescent current under light load - deployed in mobile phone baseband power rails and DSC sensor biasing.

For engineers reviewing the LD39130SJ30R datasheet, LD39130SJ30R pinout, LD39130SJ30R application, or LD39130SJ30R equivalent, key selection criteria include dropout voltage at 300 mA, green-mode transition thresholds (1–2 mA), thermal shutdown at 160 °C, output discharge resistance (100 Ω), and compatibility with 330 nF ceramic output capacitors.

Technical Context

The LD39130SJ30R implements an internal bandgap reference, fast-turn-on RC filter, and dual-mode control logic that dynamically switches between green mode (ultra-low IQ) and normal mode (fast transient response) based on real-time load current detection. It integrates foldback current limiting and thermal shutdown at 160 °C with 20 °C hysteresis.

Unlike the DFN6 version, the LD39130SJ30R (Flip-chip CSP) has no GM or ADJ pins - green mode is always active, eliminating external mode control but simplifying layout. Its output discharge path (RON = 100 Ω) actively sinks VOUT when EN is low, enabling rapid capacitor discharge without external circuitry.

Key Specifications

Pinout & Package

LD39130SJ30R uses a Flip-chip 4-bump package (0.69 × 0.69 mm, 0.4 mm pitch) with bottom-side solder bumps - no exposed leads, requiring controlled reflow and X-ray inspection for void detection. Pin numbering follows top-view orientation per DS9919 Rev 8 Figure 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B302MR-G and RT9013-30GB, the LD39130SJ30R delivers superior battery efficiency via adaptive green mode and faster system-level power cycling through integrated output discharge - critical for space-constrained, battery-limited portable systems.

Availability

LD39130SJ30R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and cordless phone systems requiring stable component supply with guaranteed 300 mA output current, -40 °C to 125 °C operation, and ultra-low quiescent current performance.

Supply support for LD39130SJ30R 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 LD39130S family targets ultra-low-power portable electronics, emphasizing minimal IQ, small footprint, and robust protection - specifically engineered for battery-operated devices where runtime and PCB area are primary constraints.

FAQ

What is the minimum input voltage required for LD39130SJ30R to regulate 3.0 V output?

The LD39130SJ30R requires a minimum input voltage of 3.3 V to maintain regulation at 300 mA load, based on its 300 mV typical dropout voltage. At lighter loads, it can regulate from as low as 3.1 V due to reduced dropout - verified by electrical characteristics Table 5, where VDROP is specified at 300 mV for IOUT = 300 mA and VOUT > 2 V.

Does LD39130SJ30R support ceramic output capacitors smaller than 1 µF?

Yes - the LD39130SJ30R is explicitly characterized for stability with 330 nF ceramic capacitors (0.33 µF), as stated in the Features section and confirmed in Table 5's COUT specification (0.33–22 µF). This enables use in space-constrained designs where 1 µF would exceed area budget.

How does the green mode switching threshold behave across temperature?

The green-to-normal mode threshold is 10 mA minimum and 2 mA maximum across -40 °C to 125 °C, per Table 5's IGH and IGL specifications. This hysteresis prevents oscillation during marginal load conditions and ensures reliable mode transitions in varying thermal environments.

Is there an internal pull-down on the EN pin, and what is its strength?

Yes - the EN pin has an internal pull-down to GND, with input leakage current ≤100 nA (Table 5, IEN), ensuring reliable default shutdown when left unconnected. This eliminates the need for external pull-down resistors in most implementations, reducing BOM count and board area.