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STMicroelectronics LD39300PT18-R
- Part No.:
- LD39300PT18-R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LD39300PT18-R.pdf
- Description:
- IC REG LINEAR 1.8V 3A PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,994
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Product details
Overview
LD39300PT18-R from STMicroelectronics is a 3A ultra-low-dropout linear voltage regulator in PPAK package, delivering fixed 1.8V output with 200mV typical dropout at full load, ±1.5% output tolerance at 25°C, and 1.2mA typical quiescent current-designed for microprocessor core power supply in embedded systems requiring stable low-voltage rail under dynamic load.
For engineers reviewing the LD39300PT18-R datasheet, LD39300PT18-R pinout, LD39300PT18-R application, or LD39300PT18-R equivalent, key selection factors include guaranteed 3A output current, ceramic-capacitor stability (≥4.7µF), logic-controlled inhibit function, thermal/current protection, and operation across –40°C to 125°C junction temperature.
Technical Context
The LD39300PT18-R employs BiCMOS process technology to decouple quiescent current from load, enabling 1.2mA typ. IQ at 3A while maintaining fast transient response to line/load changes. Its error amplifier drives an internal N-channel pass transistor with integrated current limiting and thermal shutdown at 170°C.
It operates from 2.5V to 6V input, supports external inhibit control (ON when VINH ≥2V, OFF when ≤0.3V), and achieves stability with ceramic output capacitors as low as 4.7µF-no ESR requirement-enabling compact, low-noise power delivery for noise-sensitive digital loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% at 25°C; ensures precise core rail for 1.8V I/O or logic domains. |
| Dropout Voltage | 200mV typ. @ 3A load; enables regulation from 2.0V input, critical for battery-backed or post-regulation use. |
| Quiescent Current | 1.2mA typ. @ 3A load; minimizes standby loss without sacrificing load-step response. |
| Shutdown Current | 1µA max @ 25°C in off mode; reduces system-level leakage during sleep states. |
| Input Voltage Range | 2.5V to 6V DC; compatible with single-cell Li-ion, 3.3V/5V rails, and buck-boost pre-regulators. |
| Thermal Shutdown | 170°C with 10°C hysteresis; prevents permanent damage during sustained overload or poor heatsinking. |
| Stability Capacitor | Stable with ≥4.7µF ceramic CO; eliminates need for tantalum or aluminum electrolytics, reducing BOM cost and footprint. |
Pinout & Package
LD39300PT18-R uses the PPAK (Power Package) thermally enhanced surface-mount package (6-pin, 6.0 × 6.6 mm body, 2.28 mm pitch), optimized for high-current thermal dissipation with RthJC = 8°C/W and RthJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINH | Inhibit Control Input | Logic-level enable: ≥2V = ON, ≤0.3V = OFF; must not float; drives internal MOSFET gate for fast shutdown. |
| VI | Input Voltage Supply | DC input (2.5–6V); requires 1µF ceramic capacitor placed ≤1 cm away to suppress high-frequency noise and prevent oscillation. |
| VO | Regulated Output | 1.8V output; minimum 4.7µF ceramic capacitor required at pin for loop stability and load-transient suppression. |
| GND | Power Ground Reference | Common return for VI, VO, and VINH; must be low-impedance analog ground plane to avoid PSRR degradation. |
| VSENSE/N.C. | Feedback Sense / No Connect | Not connected on fixed-output versions (e.g., LD39300PT18-R); reserved for ADJ variants' error amplifier input. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 200mV typ. @ 3A enables operation from marginal input rails (e.g., 2.0V) without dropout-induced brownout. |
| BiCMOS Quiescent Optimization | 1.2mA IQ independent of load ensures consistent efficiency across 10mA–3A, unlike bipolar LDOs whose IQ rises with IOUT. |
| Ceramic-Capacitor Stability | No minimum ESR requirement allows use of low-ESR X7R/X5R ceramics, reducing board area and improving reliability vs. tantalum. |
| Fast Load Transient Response | 20µs turn-on/off timing and <100µVRMS noise (10Hz–100kHz) support high-speed digital cores with burst-mode current demands. |
| Integrated Protection | Current limit (6A short-circuit), thermal shutdown (170°C), and reverse-voltage safe inputs prevent field failures without external circuitry. |
Applications
| Microprocessor Core Supply | DSP Power Rail |
|---|---|
|
Use Scenario: Providing clean 1.8V VDDCORE to ARM Cortex-M7 or RISC-V SoCs with 0–3A dynamic current draw. IC Role / Device Role / Timing Role: Primary low-noise linear regulator supplying processor core domain, replacing switching solutions where EMI must be minimized. Use Value: 100µVRMS output noise and fast load transient response (<20µs recovery) prevent clock jitter and instruction corruption during burst execution. |
Use Scenario: Powering TI C6000 or Analog Devices SHARC DSPs requiring tightly regulated 1.8V I/O and memory interface rails. IC Role / Device Role / Timing Role: Post-regulator after a 3.3V buck converter, delivering low-noise, low-ripple supply for high-speed parallel bus interfaces. Use Value: ±1.5% output tolerance and 0.06%/A load regulation ensure setup/hold timing margins remain intact across temperature and load variation. |
| Post-Regulator for Switchers | Industrial Sensor Node Power |
|
Use Scenario: Down-converting 3.3V buck output to 1.8V for FPGA I/O banks or DDR memory termination supplies. IC Role / Device Role / Timing Role: Low-noise linear post-regulator suppressing switcher ripple and harmonics that could couple into sensitive analog or RF sections. Use Value: 65dB PSRR at 120Hz and 55dB at 1kHz attenuates switching noise from upstream DC/DC converters before reaching noise-critical circuits. |
Use Scenario: Powering ultra-low-power IoT sensor nodes (e.g., STM32L4 + BME680) operating from coin cell or energy harvesting sources. IC Role / Device Role / Timing Role: Main system regulator with enable control synchronized to MCU sleep/wake cycles to minimize average system current. Use Value: 1µA shutdown current extends battery life in deep-sleep modes; 2.5V–6V input range accommodates wide VBAT swing (2.7–5.5V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM1083-1.8 | 2A rated, 300mV dropout @ 2A, 2.5µA IQ in shutdown, SOT-223 package | Limited to 2A; higher dropout reduces usable input headroom; smaller package limits thermal performance at full load | Select when board space is constrained and peak current stays below 2A; verify thermal margin with PCB copper area |
| MCP1826T-1802E/DB | 3A rated, 250mV dropout @ 3A, 120µA IQ in active mode, DFN-8 package | Higher active IQ increases light-load inefficiency; DFN lacks exposed thermal pad, raising RthJA to 130°C/W | Prefer for cost-sensitive designs where thermal load is moderate and shutdown current is less critical than active-mode IQ |
Compared with TSM1083-1.8 and MCP1826T-1802E/DB, LD39300PT18-R delivers superior thermal performance (RthJA = 100°C/W), lower dropout (200mV vs. ≥250mV), and tighter output tolerance (±1.5% vs. ±2%), making it optimal for high-current, high-precision 1.8V core rails in thermally demanding environments.
Availability
LD39300PT18-R is available at Aetrix Electronics and suitable for microprocessor core supply, DSP power rail, and post-regulator for switchers requiring stable component supply, long-lifecycle assurance, and automotive-grade temperature capability (–40°C to 125°C).
Supply support for LD39300PT18-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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
LD39300 belongs to ST's ultra-low-dropout linear regulator product line, engineered specifically for high-current, low-noise power delivery in space-constrained embedded systems where efficiency, precision, and thermal robustness are critical.
FAQ
What is the minimum output capacitance required for stability?
The LD39300PT18-R requires a minimum 4.7µF ceramic output capacitor placed within 1 cm of the VO and GND pins. This value ensures loop stability across –40°C to 125°C and 10mA–3A load range, with no ESR constraint-unlike many LDOs that mandate specific ESR ranges.
Can the inhibit pin be left unconnected?
No. The VINH pin has no internal pull-up or pull-down; leaving it floating risks unpredictable ON/OFF behavior. It must be tied to VI for always-on operation or driven actively to ≥2V (ON) or ≤0.3V (OFF) using a clean logic signal with adequate drive strength.
Is an input capacitor mandatory, and what type is recommended?
Yes-a minimum 1µF ceramic capacitor is required at the VI pin, placed ≤1 cm from the pin and connected directly to the GND pin with a dedicated low-impedance trace. Ceramic (X7R/X5R), tantalum, or film types are acceptable; electrolytics are discouraged due to ESR and aging effects.
How does the LD39300PT18-R handle thermal overload?
It features integrated thermal shutdown at 170°C junction temperature with 10°C hysteresis. When triggered, the output disables completely and remains off until junction temperature falls below 160°C, preventing latch-up or permanent damage during sustained overload or inadequate heatsinking.
LD39300PT18-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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 5 µA
- Current - Supply (Max):
- 2.5 mA
- PSRR:
- 65dB ~ 55dB (120Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PPAK
LD39300PT18-R FAQ
1.How can I place an order for LD39300PT18-R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD39300PT18-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 LD39300PT18-R reliable?
The price and inventory of LD39300PT18-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39300PT18-R is usually 5 days.
3.What payment methods are accepted for LD39300PT18-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39300PT18-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD39300PT18-R?
LD39300PT18-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD39300PT18-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 LD39300PT18-R?
For technical support, including LD39300PT18-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39300PT18-R requirements.
6.How does Aetrix verify that LD39300PT18-R is sourced from the original manufacturer or authorized distributors?
All LD39300PT18-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 LD39300PT18-R meets industry standards.
7.What is the process for return or replacement of LD39300PT18-R?
All LD39300PT18-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39300PT18-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 LD39300PT18-R part is unused and in its original packaging.
Return procedure for LD39300PT18-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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