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

STMicroelectronics LD3980PU08R

Name: LD3980PU08R
Brand: STMicroelectronics
SKU: LD3980PU08R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LD3980PU08R

Manufacturer:: STMicroelectronics

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

Package:: 6-VDFN Exposed Pad

Datasheet:: LD3980PU08R.pdf

Description:: IC REG LINEAR 0.8V 300MA 6DFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,656

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Product details

Overview

LD3980PU08R from STMicroelectronics is a 0.8V fixed-output, 300mA low-dropout linear regulator in DFN6 (3x3) package, featuring 130mV typical dropout at full load, ±1.0% output accuracy at 25°C, and 110µA typical quiescent current at no load-designed for local regulation in battery-powered mobile phones and PDAs.

For engineers reviewing the LD3980PU08R datasheet, LD3980PU08R pinout, LD3980PU08R application, or LD3980PU08R equivalent, key selection criteria include ultra-low dropout under 1.7V input, ceramic capacitor compatibility down to 1µF, active-low logic-controlled shutdown, and thermal/current protection for portable power integrity.

Technical Context

The LD3980PU08R employs a P-channel MOSFET pass transistor with internal bandgap reference (0.7V) and error amplifier feedback loop, enabling stable 0.8V output across 1.7–3.6V input range. Its architecture supports operation down to 100mV headroom and maintains >60dB PSRR at 1kHz despite falling input voltage-critical for Li-ion discharge profiles.

Shutdown is implemented via active-low SHDN pin that disables all internal circuitry including reference and bias, reducing supply current to ≤0.5µA. Thermal protection activates at 140°C junction temperature with 15°C hysteresis, causing pulsed output during sustained overload rather than latch-off.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 0.8V ±1.0% @ 25°C; enables direct core supply for ultra-low-voltage ASICs and RF ICs
Dropout Voltage	130mV typ. @ 300mA; allows regulation down to 0.93V input-supports single-cell Li-ion (2.7–4.2V) and Li-poly discharge tail
Quiescent Current	110µA typ. @ no load; ensures >1-year shelf life in always-on standby circuits
Shutdown Current	0.5µA max.; reduces system leakage when subsystems enter deep sleep
Output Capacitor	Stable with 1µF ceramic; eliminates need for bulky tantalum or electrolytic caps-saves PCB area and cost
PSRR	60dB @ 1kHz; suppresses switching noise from adjacent DC-DC converters in mixed-power domains
Thermal Shutdown	140°C activation with 15°C hysteresis; prevents permanent damage during transient overloads without requiring external thermal management

Pinout & Package

Package: DFN6 (3×3 mm, 0.75 mm height), ECOPACK® lead-free, exposed pad for thermal enhancement.

Pin/Terminal	Circuit Role	Design Meaning
1 OUT	Regulated output node	Delivers stable 0.8V to load; requires 1µF ceramic capacitor to ground for stability
2,3 NC	No-connect terminals	Internally unconnected; must remain floating-no routing or soldering required
4 GND	Power and signal reference	Primary return path; connects to thermal pad for optimal heat dissipation
5 SHDN	Active-low enable control	Pull to GND to disable regulator (I_Q ≤ 0.5µA); tie to IN for always-on operation
6 IN	Unregulated input supply	Accepts 1.7–3.6V; must be decoupled with ≥1µF ceramic near pin

Key Features

Feature	Design Value
Ultra-low dropout	130mV @ 300mA enables use with deeply discharged batteries (e.g., 0.93V min input for 0.8V out)
Ceramic capacitor compatibility	Stable with 1µF CO; eliminates ESR dependency and reduces BOM count vs. tantalum-based LDOs
Logic-controlled shutdown	Active-low SHDN reduces I_Q to 0.5µA-critical for multi-rail power sequencing in handheld devices
Integrated protection	Current limit (~650mA) + thermal shutdown (140°C) prevent failure during short-circuit or ambient overheating
High PSRR at low VIN	60dB @ 1kHz maintained down to 1.7V input-preserves signal integrity in noise-sensitive RF/analog sections

Applications

Mobile Phone Baseband Core Supply

Wireless Headset DSP Power Rail

Use Scenario: Powers ARM9/ARM11 application processor core operating at 0.8V nominal voltage in dual-mode GSM/UMTS handsets.

IC Role / Device Role / Timing Role: Local point-of-load regulator delivering clean, low-noise 0.8V from main PMIC buck output.

Use Value: 130mV dropout extends usable battery life by 8–12 minutes during final 0.2V of Li-ion discharge curve.

Use Scenario: Supplies 0.8V to Bluetooth audio DSP in compact wireless earbuds with tight thermal constraints.

IC Role / Device Role / Timing Role: Low-quiescent-current LDO providing always-on bias for wake-on-voice detection circuitry.

Use Value: 110µA no-load IQ enables >6-month shelf life without battery replacement or recharge.

PDA Application Processor I/O Bank

Cordless Phone DECT Transceiver Bias

Use Scenario: Regulates 0.8V for FPGA-configurable I/O banks in industrial handheld data collectors.

IC Role / Device Role / Timing Role: Digitally enabled LDO synchronized with host MCU GPIO to isolate unused peripheral sections.

Use Value: Active-low SHDN allows dynamic power gating-reducing system idle current by 210µA per disabled rail.

Use Scenario: Provides 0.8V bias to DECT transceiver RF front-end in eco-mode cordless phone base stations.

IC Role / Device Role / Timing Role: Low-noise linear regulator filtering switching noise from upstream DC-DC converter.

Use Value: 60dB PSRR at 1kHz suppresses 1.8MHz converter ripple, preventing TX spectral regrowth and EMI failures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout, low-I_Q LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P082MR	0.8V fixed, 300mA, 250mV dropout @ 300mA, 1.0µA I_Q in shutdown	Higher dropout limits usable input range to ≥1.05V; better for ultra-low-I_Q sleep modes	Select when lowest possible shutdown current (<1µA) outweighs dropout penalty
Richtek RT9193-08GB	0.8V fixed, 300mA, 200mV dropout @ 300mA, 80µA I_Q no-load, no thermal shutdown	Lacks thermal protection; requires external thermal design oversight	Select only in thermally managed environments where board-level heatsinking is guaranteed

Compared with XC6206P082MR and RT9193-08GB, LD3980PU08R uniquely balances ultra-low dropout (130mV), integrated thermal protection, and ceramic-capacitor stability-making it optimal for space-constrained, battery-limited systems where both efficiency and robustness are non-negotiable.

Availability

LD3980PU08R is available at Aetrix Electronics and suitable for mobile phone baseband supplies, wireless headset DSP rails, and PDA I/O bank regulation requiring stable component supply across long-life consumer electronics programs.

Supply support for LD3980PU08R 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 automotive, industrial, and consumer markets.

The LD3980 belongs to ST's high-efficiency, low-voltage LDO family targeting battery-powered portable electronics-engineered specifically for sub-1V core supplies in next-generation mobile SoCs and RF ICs.

FAQ

What is the minimum input voltage required for LD3980PU08R to maintain 0.8V output at 300mA?

The LD3980PU08R requires a minimum input voltage of 0.93V (0.8V + 130mV dropout) to sustain regulated 0.8V output at 300mA load. This enables operation through the final 0.2V of a single Li-ion cell's discharge curve, extending usable runtime in portable devices.

Can LD3980PU08R be used with a 0.47µF ceramic output capacitor?

No-ST specifies minimum 1µF ceramic output capacitance for stability. Using 0.47µF risks oscillation or poor transient response, as confirmed by Figure 8 and Section 6.5 of the datasheet, which defines stability boundary at CO ≥ 1µF with ESR ≤ 5000mΩ.

Does LD3980PU08R require an input capacitor, and if so, what value?

Yes-an input capacitor is required. ST recommends ≥1µF ceramic placed as close as possible to the IN pin to suppress high-frequency noise and ensure stability during line transients, as validated in Figure 11 and Section 3 (Typical Application).

How does the thermal shutdown behavior manifest during continuous overload?

When junction temperature exceeds 140°C, the LD3980PU08R disables the pass transistor; after cooling by ~15°C (to ~125°C), it automatically re-enables-resulting in pulsed output rather than latched-off state. This protects the device while maintaining visibility of fault condition to system firmware.

LD3980PU08R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 6-VDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 3.6V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 300mA

Current - Quiescent (Iq):: 110 µA

Current - Supply (Max):: 130 µA

PSRR:: 60dB ~ 58dB (1kHz ~ 10kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-DFN (3x3)

LD3980PU08R FAQ

1.How can I place an order for LD3980PU08R through Aetrix?

Please submit a Request for Quotation (RFQ) for LD3980PU08R 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 LD3980PU08R reliable?

The price and inventory of LD3980PU08R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD3980PU08R is usually 5 days.

3.What payment methods are accepted for LD3980PU08R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD3980PU08R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LD3980PU08R?

LD3980PU08R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LD3980PU08R 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 LD3980PU08R?

For technical support, including LD3980PU08R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD3980PU08R requirements.

6.How does Aetrix verify that LD3980PU08R is sourced from the original manufacturer or authorized distributors?

All LD3980PU08R 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 LD3980PU08R meets industry standards.

7.What is the process for return or replacement of LD3980PU08R?

All LD3980PU08R units undergo pre-shipment inspection (PSI). If there is an issue with LD3980PU08R, 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 LD3980PU08R part is unused and in its original packaging.

Return procedure for LD3980PU08R:

1.Submit a request within 90 days.

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

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