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

STMicroelectronics ST1L08PUR

Name: ST1L08PUR
Brand: STMicroelectronics
SKU: ST1L08PUR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1L08PUR

Manufacturer:: STMicroelectronics

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

Package:: 8-VFDFN Exposed Pad

Datasheet:: ST1L08PUR.pdf

Description:: IC REG LINEAR POS ADJ 800MA 8DFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,696

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Product details

Overview

ST1L08PUR from STMicroelectronics is an adjustable ultra-low-dropout linear regulator (LDO) delivering up to 800 mA output current with a maximum dropout voltage of 90 mV at full load, input voltage range of 1–5.5 V, and ±2.0% output voltage tolerance at 25 °C. It features logic-controlled enable, internal current/thermal protection, and operates across –40 °C to 125 °C for point-of-load regulation in space-constrained battery-powered systems.

For engineers reviewing the ST1L08PUR datasheet, ST1L08PUR pinout, ST1L08PUR application, or ST1L08PUR equivalent, this page delivers verified electrical specs, DFN8 package layout, thermal performance data, and real-world use cases - all grounded in DS10443 Rev 3 (November 2020).

Technical Context

The ST1L08PUR uses an N-channel power pass transistor biased via a dedicated VBIAS pin (requiring ≥VOUT + 1.5 V), enabling ultra-low dropout while maintaining stability with ceramic capacitors. Its dual-rail architecture separates input power (VIN) from bias supply (VBIAS), decoupling regulation performance from input rail limitations.

It integrates a precision 0.5 V reference for the ADJ pin, supporting output voltages from 0.5 V to 4.0 V via external resistor divider. The device lacks Power Good (PG) functionality - confirmed by datasheet note: "Power Good feature is not present on the ST1L08PUR" - distinguishing it from ST1L08SPUR variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	800 mA guaranteed - supports high-current SoC core rails or FPGA I/O banks without thermal derating under typical PCB layout.
Dropout voltage	70 mV typ. @ 800 mA - enables regulation from 1.2 V input to 1.1 V output, critical for sub-1.2 V logic domains.
Ground current	35 μA typ. @ no load - minimizes quiescent drain in always-on battery backup circuits.
PSRR	80 dB @ 100 Hz - suppresses low-frequency ripple from switching DC/DC stages upstream.
Output accuracy	±2.0% @ 25 °C - ensures reliable margin for 0.8 V ±2% CPU core supplies.
Thermal shutdown	165 °C with 20 °C hysteresis - provides self-recovery protection during sustained overload or poor heatsinking.
Operating temp	–40 °C to 125 °C junction - qualified for automotive infotainment power rails and industrial SSD controllers.

Pinout & Package

ST1L08PUR is housed in a thermally enhanced DFN8 (2 × 3 mm) package with exposed pad (EXP) requiring GND connection for optimal thermal performance and EMI control. R_thJA = 55 °C/W enables 800 mA operation with minimal board copper area.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Main power input	Supplies regulated output path; accepts 1–5.5 V; must be bypassed with ≥1 μF ceramic capacitor near pin.
VBIAS	Bias supply input	Provides gate drive for N-channel pass FET; must be ≥VOUT + 1.5 V and ≥2.7 V; separate from VIN for optimal dropout.
GND	Power and signal reference	Common return for VIN, VBIAS, EN, ADJ, VOUT; connects to EXP pad for thermal conduction and noise reduction.
EN	Enable control input	Active-high logic interface; <0.8 V = shutdown (I_Q < 1 μA), >1.3 V = active; supports system-level power sequencing.
ADJ	Feedback reference node	Internally biased at 0.5 V; sets VOUT = 0.5 V × (1 + R1/R2); enables remote sensing and precise low-voltage outputs.
VOUT	Regulated output	Delivers stable output (0.5–4.0 V); requires ≥4.7 μF ceramic capacitor with low ESR for stability per Figure 21.
NC	No connect	Unbonded terminal; must remain unconnected and unpopulated on PCB.
EXP	Exposed thermal pad	Not electrically active; must be soldered to solid GND plane for thermal dissipation and EMI shielding.

Key Features

Feature	Design Value
Ultra-low dropout	70 mV typ. @ 800 mA enables single-cell Li-ion (3.0–4.2 V) to power 3.3 V or 2.5 V rails with >90% efficiency.
High PSRR	80 dB @ 100 Hz rejects ripple from buck converters feeding VIN, reducing need for additional filtering stages.
Low ground current	35 μA typ. @ zero load extends battery life in standby mode for portable SSDs and IoT edge sensors.
Adjustable output	0.5–4.0 V via ADJ pin and resistor divider supports multiple SoC core/I/O voltages from one BOM item.
Integrated protection	Current limit (~1.8 A) and thermal shutdown (165 °C) prevent damage during short-circuit or airflow-blocked operation.

Applications

Hard Disk Drive Power Management

Solid-State Drive Core Regulation

Use Scenario: Regulating 1.2 V core voltage for HDD servo controller ASIC from a shared 3.3 V intermediate rail.

IC Role / Device Role / Timing Role: Low-noise LDO providing clean, tightly regulated supply with fast transient response to handle bursty servo actuation currents.

Use Value: 70 mV dropout allows use of 3.3 V rail without headroom penalty; 50 µV_RMS noise prevents timing jitter in position-sensing ADCs.

Use Scenario: Delivering 0.9 V DDR interface supply in embedded SSD modules powered by a 1.8 V system rail.

IC Role / Device Role / Timing Role: Adjustable LDO configured for 0.9 V output with remote sensing to compensate for PCB trace IR drop.

Use Value: ±2.0% accuracy ensures compliance with DDR4 VDDQ tolerance; 800 mA capacity supports multi-lane NVMe PHY operation.

Industrial Battery-Powered Sensor Hub

Automotive Infotainment Processor Core Rail

Use Scenario: Generating 1.8 V for ultra-low-power microcontroller and RF transceiver in a sealed, fanless environmental monitor.

IC Role / Device Role / Timing Role: Enable-controlled LDO enabling deep-sleep mode with <1 μA shutdown current while retaining fast wake-up capability.

Use Value: 35 μA no-load ground current extends 10-year battery life; –40 °C to 125 °C rating covers extended outdoor temperature ranges.

Use Scenario: Supplying 1.1 V core voltage to an ARM-based infotainment SoC in a vehicle cabin environment where ambient reaches 85 °C.

IC Role / Device Role / Timing Role: High-PSRR LDO rejecting alternator ripple and digital noise from display drivers and audio amplifiers.

Use Value: 80 dB PSRR @ 100 Hz attenuates 12 V battery ripple harmonics; thermal shutdown with hysteresis prevents lockup during thermal cycling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B122MR-G	Fixed 1.2 V output; no ADJ pin; 200 mA max output; SOT-25 package.	Lacks adjustability and current capacity; suitable only for low-power fixed-voltage rails.	Select only if output voltage is fixed and load ≤200 mA; incompatible for ST1L08PUR's 0.5–4.0 V or 800 mA requirements.
Analog Devices ADM7172ACPZ-R7	400 mA output; 175 mV dropout @ 400 mA; 20 μA ground current; 20 V max input.	Higher dropout and lower current limit; wider input range suits industrial 24 V systems but not low-VIN battery apps.	Prefer when input exceeds 5.5 V or ultra-low I_Q dominates over current capability; not drop-in for 800 mA loads.

Compared with XC6210B122MR-G and ADM7172ACPZ-R7, ST1L08PUR uniquely balances 800 mA output, 70 mV dropout, and 0.5–4.0 V adjustability in a 2×3 mm DFN - making it the only option for compact, high-current, battery-fed point-of-load designs requiring fine-grained voltage tuning.

Availability

ST1L08PUR is available at Aetrix Electronics and suitable for hard disk drives, solid-state drives, and battery-powered sensor hubs requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for ST1L08PUR 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 sensor solutions for automotive, industrial, and consumer markets.

ST1L08PUR belongs to ST's high-performance LDO portfolio targeting low-noise, high-PSRR, and ultra-low-dropout regulation in space-constrained, thermally demanding applications such as storage controllers and portable electronics.

FAQ

What is the minimum required VBIAS voltage for ST1L08PUR when regulating 1.8 V output?

VBIAS must be ≥VOUT + 1.5 V per datasheet Section 6.3, so for 1.8 V output, minimum VBIAS is 3.3 V. This ensures proper gate drive for the N-channel pass transistor and maintains specified dropout performance. Operating below this threshold risks increased dropout voltage or regulation failure.

Can ST1L08PUR be used without connecting the EXP pad?

No. The EXP pad is thermally critical: R_thJA is specified at 55 °C/W assuming EXP is soldered to a solid GND plane. Leaving it unconnected raises junction temperature significantly - potentially triggering thermal shutdown at ≤400 mA load. ST's recommended footprint (Figure 29) mandates EXP-to-GND connection.

Does ST1L08PUR support remote voltage sensing?

Yes. The ADJ pin enables remote sensing: connect the resistor divider's bottom leg directly to the load's VDD pin rather than the LDO's VOUT pin. This compensates for PCB trace resistance, maintaining ±2.0% accuracy at the point of load - essential for high-current, low-voltage rails like 0.9 V DDR interfaces.

Why does ST1L08PUR lack Power Good (PG) functionality while other ST1L08 variants include it?

ST1L08PUR is the base adjustable version without PG; ST1L08SPUR adds PG and VIN control circuitry. The absence reduces pin count (8-pin vs. 9-pin), simplifies layout, and lowers cost - ideal for applications where system monitoring is handled externally or unnecessary, such as basic point-of-load regulation in cost-sensitive consumer SSDs.

ST1L08PUR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.5V

Voltage - Output (Max):: 4V

Voltage Dropout (Max):: 0.09V @ 800mA

Current - Output:: 800mA

Current - Quiescent (Iq):: 35 µA

Current - Supply (Max):: -

PSRR:: 80dB ~ 50dB (100Hz ~ 1MHz)

Control Features:: Enable, Power Good

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (2x3)

ST1L08PUR FAQ

1.How can I place an order for ST1L08PUR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1L08PUR 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 ST1L08PUR reliable?

The price and inventory of ST1L08PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1L08PUR is usually 5 days.

3.What payment methods are accepted for ST1L08PUR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1L08PUR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1L08PUR?

ST1L08PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1L08PUR 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 ST1L08PUR?

For technical support, including ST1L08PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1L08PUR requirements.

6.How does Aetrix verify that ST1L08PUR is sourced from the original manufacturer or authorized distributors?

All ST1L08PUR 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 ST1L08PUR meets industry standards.

7.What is the process for return or replacement of ST1L08PUR?

All ST1L08PUR units undergo pre-shipment inspection (PSI). If there is an issue with ST1L08PUR, 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 ST1L08PUR part is unused and in its original packaging.

Return procedure for ST1L08PUR:

1.Submit a request within 90 days.

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

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