STMicroelectronics LD39130SPUR

Overview

LD39130SPUR from STMicroelectronics is a 300 mA ultra-low-quiescent-current linear voltage regulator with automatic green mode, operating from 1.4 V to 5.5 V input and delivering ±1.0% output accuracy at 25 °C. It features 300 mV typical dropout at full load, 1 µA quiescent current in green mode, and logic-controlled shutdown. Designed for space-constrained battery-powered systems like digital still cameras and portable media players, it supports ceramic output capacitors as low as 330 nF.

For engineers reviewing the LD39130SPUR datasheet, LD39130SPUR pinout, LD39130SPUR application, or LD39130SPUR equivalent, key selection criteria include dropout voltage under 300 mA load, green-mode transition thresholds (1–2 mA), thermal shutdown at 160 °C, and compatibility with DFN6 1.2×1.3 mm packaging.

Technical Context

The LD39130SPUR integrates dual operating modes: fast-response normal mode (45 µA IQ) and ultra-low-power green mode (1 µA IQ), automatically switching based on load current thresholds (IGH = 10 mA, IGL = 1–2 mA). Its internal bandgap reference, error amplifier, and GM control logic enable precise output regulation across –40 °C to 125 °C junction temperature.

It employs internal soft-start (100 µs turn-on time), output discharge path (RON = 100 Ω), and foldback current limiting (50 mA short-circuit protection), all without external components. The adjustable version uses an 800 mV ADJ reference; fixed versions offer outputs up to 4.0 V in 100 mV steps.

Key Specifications

Pinout & Package

LD39130SPUR is packaged in DFN6 1.2 × 1.3 mm, 0.4 mm pitch, with wettable flank terminations for automated optical inspection. Pin functions are validated per DS9919 Rev 8 (page 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B122MR-G and RT9080AL, LD39130SPUR uniquely balances 300 mA delivery, sub-µA green-mode IQ, and integrated thermal/foldback protection - making it optimal for thermally constrained, battery-limited systems requiring both peak and standby efficiency.

Availability

LD39130SPUR is available at Aetrix Electronics and suitable for digital still cameras, portable media players, and cordless phone systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LD39130SPUR 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 industrial, automotive, and consumer markets.

The LD39130SPUR belongs to ST's high-accuracy, ultra-low-IQ LDO family - engineered specifically for battery-powered portable electronics demanding extended runtime and minimal board area.

FAQ

What is the minimum output capacitor required for stability?

The LD39130SPUR is stable with as little as 330 nF ceramic output capacitance, verified per DS9919 Figure 32. For optimal transient response and PSRR, ST recommends 1 µF X7R/X5R MLCC placed directly adjacent to the OUT and GND pins. ESR must remain below 4 Ω across the operating temperature range.

How does the auto green mode switch between operating states?

Auto green mode switches based on measured load current: it enters green mode when I_OUT drops below 1–2 mA (IGL threshold) and reverts to normal mode above 10 mA (IGH threshold). This transition is managed by internal current-sense circuitry and requires no external components - GM pin must be low (or floating, since internally pulled down) to enable the function.

Can LD39130SPUR be used with a 0.8 V output?

Yes - the adjustable version (LD39130S) supports 0.8 V output using the ADJ pin with a resistor divider (V_OUT = 0.8 V × (1 + R1/R2)). Fixed-output variants start at 0.8 V and scale in 100 mV increments up to 4.0 V. Output accuracy remains ±1.0% at 25 °C for V_OUT > 2 V, and ±20 mV for V_OUT ≤ 2 V.

Is the DFN6 package lead-free and RoHS compliant?

Yes - LD39130SPUR is supplied in ECOPACK2-compliant DFN6 packaging, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements. The "P" suffix in the part number denotes lead-free, halogen-free, and matte-tin terminal finish, qualified for reflow soldering per JEDEC J-STD-020.