STMicroelectronics LD39130SJ33R

Overview

LD39130SJ33R from STMicroelectronics is a 3.3 V fixed-output, 300 mA ultra-low-dropout linear regulator with automatic green mode, 300 mV typical dropout at full load, ±1.0% output voltage accuracy at 25 °C, and 1 µA quiescent current in green mode - designed for power management in space-constrained, battery-powered mobile and portable systems.

For engineers reviewing the LD39130SJ33R datasheet, LD39130SJ33R pinout, LD39130SJ33R application, or LD39130SJ33R equivalent, key selection criteria include dropout voltage under 300 mA load, green-mode transition thresholds (1–2 mA), thermal shutdown at 160 °C, compatibility with 330 nF ceramic output capacitors, and DFN6 1.2×1.3 mm package footprint.

Technical Context

The LD39130SJ33R 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 load. Its bandgap reference and error amplifier drive a PMOS pass transistor with internal soft-start (100 µs turn-on time) and output discharge path (100 Ω).

Stability is ensured with ceramic output capacitors ≥330 nF and ESR <8 Ω; the device integrates current foldback (50 mA short-circuit limit), thermal shutdown (160 °C, 20 °C hysteresis), and logic-controlled enable/shutdown (VEN logic low = <0.4 V, shutdown current <0.1 µA).

Key Specifications

Pinout & Package

LD39130SJ33R is packaged in Flip-chip 4 bumps (0.69 × 0.69 mm, 0.4 mm pitch), a chip-scale package optimized for minimal PCB area. Unlike the DFN6 variant, this version omits GM and ADJ pins - green mode is always enabled, and output is fixed at 3.3 V.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B332MR-G and RT9080A-33PU5, LD39130SJ33R uniquely combines sub-µA green-mode IQ, 300 mV dropout, and integrated output discharge - making it optimal for battery-powered devices with highly variable, bursty load profiles.

Availability

LD39130SJ33R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, cordless phones, and portable media players requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD391330SJ33R 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 silicon solutions for automotive, industrial, and consumer markets since 1987.

The LD39130S family targets ultra-low-power portable electronics, emphasizing minimal quiescent current, miniature packaging, and intelligent power-state adaptation - directly addressing battery runtime and PCB space constraints in next-generation handheld devices.

FAQ

What is the minimum input voltage required for LD39130SJ33R to regulate 3.3 V output?

The LD39130SJ33R requires a minimum input voltage of 3.6 V to maintain regulation at 3.3 V output under 300 mA load, based on its 300 mV typical dropout voltage. At lighter loads, regulation is possible down to 1.4 V input, but output will drop below 3.3 V if VIN − VDROP < 3.3 V.

Can LD39130SJ33R be used with a 2.2 µF ceramic output capacitor?

Yes - the LD39130SJ33R is stable with ceramic output capacitors ranging from 330 nF to 22 µF, including 2.2 µF X7R types. This value falls well within the recommended stability region shown in Figure 32 of DS9919, ensuring robust phase margin across temperature and load.

Does LD39130SJ33R support remote sensing of the output voltage?

No - LD39130SJ33R is a fixed-output (3.3 V) variant in Flip-chip package and lacks the ADJ pin. Remote sensing is only available on the adjustable LD39130S DFN6 version, which includes dedicated ADJ and GM pins for feedback and mode control.

How does the green mode switching threshold behave over temperature?

The green-to-normal mode threshold is 10 mA (typ.) at 25 °C and remains stable across −40 °C to +125 °C, with measured variation ≤±0.5 mA per datasheet Figure 14. The normal-to-green threshold is 1–2 mA and exhibits similarly tight thermal consistency, enabling predictable power-state transitions in wide-temperature environments.