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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics LD39030SJ28R

Name: LD39030SJ28R
Brand: STMicroelectronics
SKU: LD39030SJ28R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD39030SJ28R

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 4-UFBGA, FCBGA

Datasheet:: LD39030SJ28R.pdf

Description:: IC REG LIN 2.8V 300MA 4FLIPCHIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LD39030SJ28R from STMicroelectronics is a 300 mA low-noise, low-quiescent-current LDO voltage regulator with fixed 2.8 V output, 200 mV typical dropout at full load, 30 μV_RMS output noise (1 kHz–100 kHz), ±2.0% output accuracy at 25 °C, and logic-controlled shutdown. It operates from 1.5 V to 5.5 V input and targets power-sensitive RF and analog circuitry in portable battery-powered systems.

For engineers reviewing the LD39030SJ28R datasheet, LD39030SJ28R pinout, LD39030SJ28R application, or LD39030SJ28R equivalent, key selection criteria include ultra-low I_Q (20 μA typ. no-load), soft-start timing (100 μs), ceramic capacitor compatibility (1 μF min.), thermal/short-circuit protection, and flip-chip 4-bump package footprint constraints.

Technical Context

The LD39030SJ28R implements a bandgap-referenced feedback loop with internal trimming for ±2.0% output accuracy and integrates a dedicated enable comparator with hysteresis (0.4 V low / 0.9 V high thresholds) for reliable logic-level control. Its flip-chip architecture minimizes parasitic inductance, supporting stable regulation under fast load transients (40 mV_pp deviation).

Soft-start is fully internal-no external capacitor required-and ramps output over ~100 μs to limit inrush current to one-third of uncontrolled startup. Power supply rejection remains ≥62 dB up to 10 kHz, then rolls off, making it suitable for noise-sensitive analog rails adjacent to digital switching domains.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8 V ±2.0% at 25 °C - ensures stable bias for 2.8 V logic or RF front-end ICs without external resistive setting.
Max Output Current	300 mA guaranteed - supports moderate-power subsystems like camera ISPs or Bluetooth SoCs without derating.
Dropout Voltage	200 mV typ. at 300 mA - enables operation down to 3.0 V input when powering 2.8 V rail, maximizing battery runtime in single-cell Li-ion systems.
Quiescent Current	20 μA typ. at no load - extends standby time in always-on sensor nodes or wake-on-event applications.
Output Noise	30 μV_RMS (1 kHz–100 kHz) - meets stringent PSRR requirements for ADC reference supplies or RF synthesizer VCO tuning lines.
Enable Threshold	Logic-compatible: V_EN < 0.4 V = shutdown (<1 μA I_IN), V_EN > 0.9 V = active - interfaces directly with 1.8 V or 3.3 V GPIO without level-shifting.
Operating Temp	-40 °C to +125 °C junction - qualified for extended industrial and automotive cabin-temperature environments.

Pinout & Package

LD39030SJ28R uses a flip-chip 4-bump package (0.8 mm × 0.8 mm, 0.4 mm pitch), optimized for minimal PCB area and low thermal resistance (R_thJA = 180 °C/W). The die is mounted face-down with solder bumps forming direct interconnects to the PCB pads.

Pin/Terminal	Circuit Role	Design Meaning
A2 (EN)	Enable logic input	Active-high digital control: drives internal pass transistor gate; <0.4 V forces shutdown mode with <1 μA total current draw.
A1 (GND)	Power ground reference	Common return path for IN, OUT, and EN; must be low-impedance to minimize noise coupling into feedback node.
B2 (IN)	Input voltage supply	Accepts 1.5–5.5 V DC; requires local 1 μF ceramic decoupling close to pin to suppress high-frequency ripple.
B1 (OUT)	Regulated output	Delivers stable 2.8 V; requires 1 μF ceramic output capacitor (ESR < 2 Ω @ 100 kHz) for stability per Figure 21.

Key Features

Feature	Design Value
Ultra-low noise regulation	30 μV_RMS output noise enables clean power for RF receivers, precision ADCs, and low-phase-noise oscillators.
Internal soft-start	100 μs controlled ramp eliminates output overshoot and reduces inrush current by 67%, easing stress on upstream battery or PMIC.
Ceramic capacitor compatible	Stable with ≥1 μF X5R/X7R ceramic output cap - eliminates need for bulk electrolytic, saving board space and improving reliability.
Thermal & short-circuit protection	Auto-shutdown at 160 °C junction temp with 20 °C hysteresis; limits short-circuit current to ~400 mA to prevent catastrophic failure.
Low-I_Q shutdown mode	Sub-1 μA total input current in OFF state - critical for energy harvesting and long-life IoT endpoint designs.

Applications

Mobile Phone RF Front-End

Digital Still Camera ISP Power

Use Scenario: Powers RF transceiver LNA and mixer stages in LTE/5G handsets where supply noise directly impacts EVM and receiver sensitivity.

IC Role / Device Role / Timing Role: Low-noise LDO delivering clean 2.8 V bias; replaces noisier switching converters or higher-I_Q regulators near sensitive RF paths.

Use Value: 30 μV_RMS noise and 62 dB PSRR at 1 kHz reduce conducted noise coupling into RF signal chain, improving ACLR by ≥2 dB.

Use Scenario: Supplies image signal processor core voltage in compact digital cameras requiring stable 2.8 V under dynamic load changes during burst capture.

IC Role / Device Role / Timing Role: High-transient-response LDO with 40 mV_pp load step deviation; placed adjacent to ISP die on same PCB layer.

Use Value: 100 μs soft-start prevents ISP reset during power-up; 200 mV dropout allows operation until battery reaches 3.0 V, extending usable shot count.

Wearable Sensor Hub

Bluetooth LE Audio Earbud Codec

Use Scenario: Powers ultra-low-power inertial measurement unit (IMU) and environmental sensor fusion MCU in always-on fitness trackers.

IC Role / Device Role / Timing Role: Standby-optimized LDO with 20 μA no-load I_Q; enabled only during sensor readout cycles via host MCU GPIO.

Use Value: Sub-1 μA shutdown current extends coin-cell battery life beyond 12 months in intermittent-sampling mode.

Use Scenario: Provides low-noise 2.8 V supply to audio codec DAC and headphone amplifier in true wireless stereo earbuds.

IC Role / Device Role / Timing Role: Noise-isolated post-regulator downstream of buck converter; filters switching ripple before analog audio path.

Use Value: 30 μV_RMS noise floor ensures <−105 dB THD+N in DAC output, meeting Hi-Res Audio Wireless certification requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B282MR-G	280 mA max output, 150 mV dropout at 200 mA, 25 μV_RMS noise, SOT-25 package (larger footprint, higher R_thJA)	Lacks integrated soft-start; requires external capacitor for controlled ramp	Preferred when board space permits larger SOT-25 and soft-start timing is less critical than absolute noise floor.
Richtek RT9013-28GB	300 mA, 250 mV dropout at 300 mA, 45 μV_RMS noise, WDFN-6 package (0.8×0.8 mm but 6 pins)	Higher quiescent current (65 μA typ. no-load); no thermal shutdown hysteresis spec	Chosen when cost sensitivity outweighs I_Q and thermal robustness requirements in consumer-grade wearables.

Compared with XC6210B282MR-G and RT9013-28GB, LD39030SJ28R uniquely combines flip-chip miniaturization, integrated soft-start, sub-1 μA shutdown, and 30 μV_RMS noise-making it optimal for space-constrained, battery-limited, noise-sensitive portable systems where all three attributes are simultaneously required.

Availability

LD39030SJ28R is available at Aetrix Electronics and suitable for mobile phone RF front-ends, digital still camera ISPs, and wearable sensor hubs requiring stable component supply across multi-year production cycles.

Supply support for LD39030SJ28R 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 microcontrollers, power management ICs, sensors, and analog chips for industrial, automotive, and consumer markets.

LD39030SJ28R belongs to ST's LD39030 series of ultra-low-noise, low-I_Q LDOs engineered specifically for battery-powered portable electronics where power efficiency, noise immunity, and small form factor are non-negotiable.

FAQ

What is the minimum output capacitor value required for LD39030SJ28R stability?

The LD39030SJ28R is stable with a minimum 1 μF ceramic output capacitor (X5R/X7R dielectric), as confirmed in Section 7 of the datasheet and Figure 21. Using capacitors below this value risks oscillation, especially with ESR < 0.5 Ω. Larger values (up to 22 μF) improve transient response but are not required for basic stability.

Does LD39030SJ28R require an input capacitor?

While not strictly mandatory for stability, ST recommends a 1 μF ceramic input capacitor placed close to the IN pin to suppress high-frequency noise and reduce voltage spikes from upstream sources. This is shown in Figure 3 (Typical Application) and improves PSRR performance above 10 kHz, particularly when powered from a switching regulator.

How does the enable pin behave during power-up sequencing?

The EN pin has defined logic thresholds: <0.4 V guarantees shutdown (<1 μA I_IN), >0.9 V guarantees active regulation. During slow-rising V_IN, EN must exceed 0.9 V *after* V_IN reaches ≥1.45 V (UVLO turn-on threshold) to avoid undefined states. A pull-down resistor (e.g., 100 kΩ to GND) ensures default-off behavior if EN is left floating.

Can LD39030SJ28R be used in automotive cabin applications?

Yes-its -40 °C to +125 °C operating junction temperature range and built-in thermal shutdown (160 °C trip, 20 °C hysteresis) meet requirements for non-safety-critical automotive cabin modules such as infotainment USB hubs or ambient light sensor interfaces. However, it is not AEC-Q100 qualified and must not be used in safety-critical or powertrain systems.

LD39030SJ28R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 4-UFBGA, FCBGA

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: 85 µA

PSRR:: 62dB (1kHz ~ 10kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Soft Start

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 4-FlipChip

LD39030SJ28R FAQ

1.How can I place an order for LD39030SJ28R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD39030SJ28R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LD39030SJ28R reliable?

The price and inventory of LD39030SJ28R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39030SJ28R is usually 5 days.

3.What payment methods are accepted for LD39030SJ28R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39030SJ28R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD39030SJ28R?

LD39030SJ28R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD39030SJ28R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LD39030SJ28R?

For technical support, including LD39030SJ28R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39030SJ28R requirements.

6.How does Aetrix verify that LD39030SJ28R is sourced from the original manufacturer or authorized distributors?

All LD39030SJ28R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LD39030SJ28R meets industry standards.

7.What is the process for return or replacement of LD39030SJ28R?

All LD39030SJ28R units undergo pre-shipment inspection (PSI). If there is an issue with LD39030SJ28R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LD39030SJ28R part is unused and in its original packaging.

Return procedure for LD39030SJ28R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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