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STMicroelectronics LD39150PT-R
- Part No.:
- LD39150PT-R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LD39150PT-R.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:6,351
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Product details
Overview
LD39150PT-R from STMicroelectronics is an adjustable ultra-low-dropout linear voltage regulator in DFN6 (3×3 mm) package, delivering up to 1.5 A output current with 200 mV typical dropout at full load and 1 µA max quiescent current in shutdown mode. It operates from 2.5 V to 6 V input, supports ADJ output from 1.22 V to 5.0 V, and features logic-controlled inhibit, internal current/thermal limiting, and ±1.5% output voltage tolerance at 25 °C - designed for microprocessor core and memory power rails.
For engineers reviewing the LD39150PT-R datasheet, LD39150PT-R pinout, LD39150PT-R application, or LD39150PT-R equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for low-noise, high-efficiency linear regulation in space-constrained embedded systems.
Technical Context
The LD39150PT-R uses a BiCMOS process enabling load-independent quiescent current - 1 mA typ. at 1.5 A load and ≤1 µA in OFF mode - critical for battery-backed and always-on subsystems. Its error amplifier senses output via VSENSE (pin 5), supporting precise ADJ configuration with external resistor divider (R1/R2), while the inhibit input (pin 2) provides clean ON/OFF control with 0.3 V/2 V thresholds.
Stability is ensured with ≥2.2 µF ceramic output capacitor and 1 µF input capacitor placed within 1 cm of respective pins; the device exhibits fast transient response and 65 dB SVR at 120 Hz, making it suitable for post-regulation after switching converters where noise rejection and dynamic line/load regulation (<0.2% line, <0.4%/A load) are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1.5 A guaranteed - supports high-current digital loads like ARM Cortex-A cores without thermal derating under proper PCB heatsinking. |
| Dropout voltage | 200 mV typ. @ 1.5 A - enables 3.3 V output from 3.5 V input, minimizing power loss and heat generation in low-VIN applications. |
| Quiescent current | 1 µA max @ 25 °C in OFF mode - extends battery life in standby states for portable and IoT edge devices. |
| Output voltage accuracy | ±1.5% @ 25 °C, ±3% over -40 to 125 °C - ensures reliable logic-level compliance for 1.8 V/2.5 V/3.3 V I/O domains. |
| Supply voltage rejection | 65 dB @ 120 Hz - suppresses ripple from upstream DC-DC stages, reducing need for additional filtering in mixed-signal systems. |
| Operating temperature | -40 to 125 °C junction - qualified for automotive under-hood and industrial control environments without derating. |
| Noise voltage | 100 µVRMS (10 Hz–100 kHz) - meets low-noise requirements for ADC reference supplies and RF bias rails. |
Pinout & Package
LD39150PT-R is housed in a thermally enhanced DFN6 (3 × 3 mm) package with exposed thermal pad (TAB) electrically connected to GND. The 6-pin layout supports compact layout and efficient PCB heat dissipation when the TAB is soldered to a dedicated ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Common analog/digital return path; must be low-impedance connection to PCB ground plane. |
| 2 - VINH | Inhibit control input | Active-low enable: ≤0.3 V disables regulator (≤1 µA IQ); ≥2 V enables operation; must not float. |
| 3 - VI | Input voltage supply | 2.5–6 V DC input; requires 1 µF ceramic capacitor placed ≤1 cm away with direct GND trace. |
| 4 - VO | Regulated output | Adjustable output (1.22–5.0 V); requires ≥2.2 µF ceramic CO with ESR matching stability region per Fig. 15/16. |
| 5 - VSENSE | Feedback input (ADJ only) | Connects to resistor divider (R1/R2) for VO = 1.22 V × (1 + R1/R2); replaces VO pin on fixed versions. |
| 6 - N.C. | No connect | Not bonded internally; leave unconnected on PCB; no routing or copper fill required. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV @ 1.5 A enables high-efficiency regulation from tight input margins (e.g., Li-ion battery discharge tail). |
| BiCMOS architecture | Enables 1 mA IQ independent of load - eliminates efficiency collapse at light loads common in CMOS LDOs. |
| Ceramic capacitor stability | Stable with ≥2.2 µF X7R/X5R ceramics - reduces BOM cost and board area vs. tantalum or electrolytic alternatives. |
| Fast transient response | Load step recovery in <15 µs (TD-ON/TD-OFF) - maintains voltage integrity during CPU burst-mode operation. |
| Thermal shutdown | 170 °C trip with 10 °C hysteresis - protects against sustained overload without latch-up or manual reset. |
Applications
| Mobile Application Processor Core Supply | Automotive Infotainment SoC Rail |
|---|---|
|
Use Scenario: Powering ARM Cortex-A7/A53 core voltage (VDD_CORE) in smartphones/tablets requiring tight voltage tolerance and rapid load transients. IC Role / Device Role / Timing Role: Primary low-noise post-regulator converting 4.2 V battery or 3.3 V buck output to 1.1 V–1.3 V core rail via ADJ configuration. Use Value: 100 µVRMS noise and ±1.5% accuracy prevent timing violations; 15 µs transient response avoids brownout during CPU frequency scaling. |
Use Scenario: Providing clean 1.8 V I/O supply for multimedia SoCs (e.g., NXP i.MX8) in head-unit systems operating across -40 to 105 °C ambient. IC Role / Device Role / Timing Role: Secondary LDO for DDR3/4 interface power, decoupling high-speed data lines from noisy main DC-DC converters. Use Value: 65 dB SVR at 120 Hz suppresses switching ripple; -40 to 125 °C rating ensures reliability without derating in sealed enclosures. |
| Industrial PLC Digital I/O Module | Medical Wearable Sensor Hub |
|
Use Scenario: Generating stable 3.3 V logic rail for isolated digital I/O drivers in programmable logic controllers with wide input voltage variation. IC Role / Device Role / Timing Role: Input-flexible (2.5–6 V) LDO accepting variable 5 V bus or PoE-derived supply, with inhibit control for system-level power sequencing. Use Value: 200 mV dropout allows operation down to 3.5 V input; 1 µA shutdown current enables energy harvesting-compatible sleep modes. |
Use Scenario: Biasing ultra-low-power biosensor analog front-ends (e.g., ECG/PPG ICs) in battery-operated wearable patches. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator supplying 1.8 V to precision ADCs and op-amps, with shutdown synchronized to sensor sampling intervals. Use Value: 1 µA OFF-mode current extends 2-week battery life; 100 µVRMS noise preserves signal-to-noise ratio in sub-µV biomedical signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B122MR-G | 1 A max output, 150 mV dropout @ 1 A, 25 µA IQ (ON), SOT-25 package | Limited to 1 A and lacks thermal shutdown; smaller footprint but lower power capability | Select for cost-sensitive, low-current designs where 1.5 A headroom and robust protection are not required. |
| Analog Devices ADM7172ACPZ-R7 | 2 A output, 120 mV dropout @ 2 A, 250 µA IQ, 20-pin LFCSP, integrated soft-start | Higher performance but larger size, higher cost, and no inhibit pin - requires external enable logic | Choose when >1.5 A load or tighter transient specs demand premium performance, and PCB area permits larger package. |
Compared with XC6210B122MR-G and ADM7172ACPZ-R7, the LD39150PT-R uniquely balances 1.5 A capability, 1 µA shutdown, DFN6 compactness, and integrated inhibit - making it optimal for space-constrained, battery-aware systems needing robust protection and simple control.
Availability
LD39150PT-R is available at Aetrix Electronics and suitable for mobile processor core supplies, automotive infotainment SoC rails, and industrial PLC digital I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LD39150PT-R 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 components for industrial, automotive, and consumer markets.
The LD39150 belongs to ST's ultra-low-dropout linear regulator product line, engineered specifically for high-efficiency, low-noise post-regulation in battery-powered and thermally constrained embedded systems.
FAQ
What is the minimum output capacitance required for LD39150PT-R stability?
The LD39150PT-R requires a minimum 2.2 µF ceramic output capacitor for guaranteed stability across temperature and load conditions. Capacitor selection must also meet ESR constraints shown in Figures 15 and 16 of the datasheet - typically 5–30 mΩ for X7R types - and must be placed within 1 cm of the VO and GND pins using dedicated low-impedance traces.
Can LD39150PT-R be used without the inhibit pin connected?
No - the VINH pin (pin 2) is not internally pulled up or down and must never be left floating. If inhibit functionality is unused, VINH must be tied directly to VI (input voltage) to ensure continuous ON operation. Leaving it unconnected risks erratic enable/disable behavior and potential output instability due to noise coupling.
How does the VSENSE pin function in the LD39150PT-R adjustable configuration?
In LD39150PT-R (ADJ version), pin 5 (VSENSE) serves as the error amplifier's inverting input. It connects to the junction of an external resistor divider (R1–R2) between VO and GND, setting output voltage as VO = 1.22 V × (1 + R1/R2). Unlike fixed-output variants, VSENSE replaces the VO pin connection and enables precise, user-defined regulation from 1.22 V to 5.0 V.
What thermal considerations apply when using LD39150PT-R at 1.5 A output?
At 1.5 A and 3.3 V output from a 5 V input, power dissipation is ~2.55 W. With DFN6 RthJA = 40 °C/W (with PCB ground plane heatsink), junction temperature rise is ~102 °C - requiring careful thermal design. Use ≥200 mm² of 2-oz copper connected to the exposed TAB, minimize VI–VO differential, and verify TJ ≤ 125 °C under worst-case ambient and airflow conditions.
LD39150PT-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.4V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 2.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 65dB ~ 55dB (120Hz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PPAK
LD39150PT-R FAQ
1.How can I place an order for LD39150PT-R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD39150PT-R 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 LD39150PT-R reliable?
The price and inventory of LD39150PT-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39150PT-R is usually 5 days.
3.What payment methods are accepted for LD39150PT-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39150PT-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD39150PT-R?
LD39150PT-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD39150PT-R 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 LD39150PT-R?
For technical support, including LD39150PT-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39150PT-R requirements.
6.How does Aetrix verify that LD39150PT-R is sourced from the original manufacturer or authorized distributors?
All LD39150PT-R 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 LD39150PT-R meets industry standards.
7.What is the process for return or replacement of LD39150PT-R?
All LD39150PT-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39150PT-R, 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 LD39150PT-R part is unused and in its original packaging.
Return procedure for LD39150PT-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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