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

STMicroelectronics LDL112D12R

Name: LDL112D12R
Brand: STMicroelectronics
SKU: LDL112D12R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LDL112D12R

Manufacturer:: STMicroelectronics

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

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LDL112D12R.pdf

Description:: IC REG LINEAR 1.2V 1.2A 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:651

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Product details

Overview

LDL112D12R from STMicroelectronics is a 1.2 A low-dropout linear regulator with fixed 1.2 V output, 300 mV typical dropout at 1 A, ±2.0% output voltage accuracy at 25 °C, reverse current protection, and logic-controlled shutdown. It operates from 1.6 V to 5.5 V input and supports ceramic output capacitors as low as 1 µF - ideal for USB-powered devices and battery-powered point-of-load regulation.

For engineers reviewing the LDL112D12R datasheet, LDL112D12R pinout, LDL112D12R application, or LDL112D12R equivalent, key selection criteria include dropout voltage under 1.2 A load, sub-1 µA shutdown current, thermal/short-circuit protection behavior, and compatibility with 1 µF ceramic COUT in space-constrained consumer and embedded systems.

Technical Context

The LDL112D12R uses a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse current blocking without external components. Its internal bandgap reference (800 mV) and error amplifier regulate output via feedback to maintain stability across temperature and load.

Logic-controlled enable (EN) drives the device into sub-1 µA off-mode; thermal shutdown activates at 165 °C with 20 °C hysteresis. Reverse current protection operates in both on- and off-states by dynamically switching gate and bulk terminals to VOUT when VOUT exceeds VIN + 100 mV.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	Fixed 1.2 V ±2.0% at 25 °C - ensures stable core voltage for low-power microcontrollers and sensors.
Max output current	1.2 A guaranteed - supports moderate-power peripherals without external current boosting.
Dropout voltage	300 mV typ. at 1 A load - enables operation down to VIN = 1.5 V while maintaining regulation.
Quiescent current	35 µA typ. at no load - minimizes standby power loss in always-on battery systems.
Shutdown current	≤1 µA max. - extends shelf life and runtime in deep-sleep modes of portable electronics.
Input voltage range	1.6 V to 5.5 V - compatible with single-cell Li-ion, Li-Po, and USB 5 V rails.
Output capacitor	1 µF ceramic minimum - eliminates need for bulky tantalum or electrolytic capacitors.
Operating temperature	−40 °C to +125 °C junction - qualified for automotive cabin and industrial edge applications.

Pinout & Package

LDL112D12R is available in SO8-batwing and PPAK packages. Both use identical 5-pin functional mapping with exposed pad tied to GND for thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
VIN	LDO input supply	Accepts 1.6–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin.
GND	Power and signal reference	Common return path; exposed pad must be soldered to PCB ground plane for thermal dissipation.
EN	Enable control input	Active-high logic: <0.35 V = shutdown (<1 µA), >1.4 V = active; must not float.
VOUT	Regulated output	Delivers fixed 1.2 V ±2% to load; requires ≥1 µF ceramic capacitor directly at pin.
NC	No-connect terminal	Not internally bonded; left unconnected per datasheet - no routing or stitching required.

Key Features

Feature	Design Value
Reverse current protection	Blocks backflow from VOUT to VIN in all states (on/off), eliminating need for external blocking diode.
Ultra-low dropout	300 mV at 1 A enables high-efficiency regulation even with marginal input margins (e.g., 1.5 V VIN → 1.2 V OUT).
Thermal & short-circuit protection	Internally limits current to ~2 A and shuts down at 165 °C with 20 °C hysteresis - prevents damage during fault conditions.
Ceramic capacitor compatibility	Stable with 1 µF COUT - reduces BOM cost, board area, and ESL vs. traditional tantalum solutions.
Wide temperature operation	Specified from −40 °C to +125 °C junction - supports under-hood, industrial, and extended-range portable designs.

Applications

USB Power Delivery Interface

Low-Power Microcontroller Core Supply

Use Scenario: Regulating 5 V USB input to clean 1.2 V for ARM Cortex-M0+ core logic.

IC Role / Device Role / Timing Role: Primary point-of-load LDO delivering stable core voltage with fast transient response to CPU burst loads.

Use Value: 300 mV dropout allows full 1.2 V regulation even as USB voltage sags to 1.5 V; 1 µF COUT fits tight layout near SoC.

Use Scenario: Powering sensor hub MCU in wearable device powered by single-cell Li-Po (2.7–4.2 V).

IC Role / Device Role / Timing Role: Main system regulator enabling <1 µA shutdown mode during motion-sensing sleep cycles.

Use Value: 35 µA quiescent current and ≤1 µA off-mode extend battery life beyond 6 months in intermittent-use applications.

Industrial Sensor Node

Automotive Body Control Module

Use Scenario: Providing 1.2 V bias to precision ADC and analog front-end in wired industrial sensor transmitter.

IC Role / Device Role / Timing Role: Low-noise local regulator isolating sensitive analog circuitry from noisy digital supply rails.

Use Value: 135 µV_RMS output noise (10 Hz–100 kHz) and 57 dB PSRR preserve ADC SNR in 24-bit measurement systems.

Use Scenario: Supplying 1.2 V to CAN transceiver logic interface in 12 V automotive body control unit.

IC Role / Device Role / Timing Role: Protected auxiliary LDO with reverse-current blocking to prevent backfeed during battery jump-start events.

Use Value: Reverse current protection eliminates risk of VOUT→VIN backfeed when external 12 V source overrides main supply during service.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TSM101212DCQ	1.2 A, 1.2 V fixed, 400 mV dropout at 1 A, 50 µA IQ - higher dropout and quiescent current.	Lacks reverse current protection; requires external diode for backfeed prevention.	Choose only if cost sensitivity outweighs efficiency and protection requirements.
MCP1703T-1202E/MB	250 mA max, 1.2 V fixed, 600 mV dropout at 250 mA - lower current rating and higher dropout.	Not suitable for 1.2 A loads; limited thermal capability in SO-8 package.	Acceptable only for light-load subsystems where peak current stays below 250 mA.

Compared with TSM101212DCQ and MCP1703T-1202E/MB, LDL112D12R delivers superior current capability, lower dropout, integrated reverse-current blocking, and tighter output tolerance - making it the only choice for 1.2 A, 1.2 V applications requiring robustness and minimal external components.

Availability

LDL112D12R is available at Aetrix Electronics and suitable for USB-powered devices, battery-powered point-of-load systems, and low-voltage microcontroller core supplies requiring stable component supply across production lifecycles.

Supply support for LDL112D12R 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

LDL112D12R belongs to ST's high-efficiency LDO family targeting ultra-low-power, space-constrained applications - engineered specifically for battery longevity, thermal resilience, and integration simplicity in portable and embedded systems.

FAQ

What is the minimum input voltage required to maintain 1.2 V output at 1.2 A load?

The LDL112D12R requires VIN ≥ VOUT + VDROP. With a maximum dropout of 600 mV at 1.2 A and 125 °C, the minimum input is 1.2 V + 0.6 V = 1.8 V. At room temperature, typical dropout is 350 mV, so 1.55 V suffices - but design margin should assume worst-case 600 mV.

Can LDL112D12R be used with a 0.47 µF output capacitor?

No. The datasheet specifies a minimum 1 µF ceramic capacitor for stability across all operating conditions. Using 0.47 µF risks oscillation or poor transient response, especially under load steps or temperature extremes - confirmed by Figure 25's stability boundary showing instability below 1 µF.

Does the NC pin require PCB connection or grounding?

No. The NC (No Connect) pin is not internally bonded and serves no electrical function. It must remain unconnected - neither routed nor tied to GND or any other net - as stated in Table 1 and validated in DFN6/SO8/PPAK pinout diagrams (Figures 3–4).

How does reverse current protection behave when EN = GND and VOUT = 3.3 V while VIN = 0 V?

With EN = GND, the device is in shutdown. If VOUT rises to 3.3 V (e.g., from another supply), reverse current protection actively blocks conduction: the PMOS pass transistor is fully off, and gate/bulk terminals are switched to VOUT, ensuring zero current flows from VOUT to VIN - verified in Section 6.3 Case 1 of DS10321 Rev 3.

LDL112D12R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

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):: 1.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.6V @ 1.2A

Current - Output:: 1.2A

Current - Quiescent (Iq):: 70 µA

Current - Supply (Max):: 400 µA

PSRR:: 57dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Reverse Current

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

LDL112D12R FAQ

1.How can I place an order for LDL112D12R through Aetrix?

Please submit a Request for Quotation (RFQ) for LDL112D12R 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 LDL112D12R reliable?

The price and inventory of LDL112D12R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDL112D12R is usually 5 days.

3.What payment methods are accepted for LDL112D12R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDL112D12R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDL112D12R?

LDL112D12R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDL112D12R 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 LDL112D12R?

For technical support, including LDL112D12R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDL112D12R requirements.

6.How does Aetrix verify that LDL112D12R is sourced from the original manufacturer or authorized distributors?

All LDL112D12R 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 LDL112D12R meets industry standards.

7.What is the process for return or replacement of LDL112D12R?

All LDL112D12R units undergo pre-shipment inspection (PSI). If there is an issue with LDL112D12R, 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 LDL112D12R part is unused and in its original packaging.

Return procedure for LDL112D12R:

1.Submit a request within 90 days.

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

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