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STMicroelectronics LD39300PT-R
- Part No.:
- LD39300PT-R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LD39300PT-R.pdf
- Description:
- IC REG LINEAR POS ADJ 3A PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
LD39300PT-R from STMicroelectronics is an adjustable ultra-low-dropout linear voltage regulator delivering up to 3A output current with 200mV typical dropout at full load, ±1.5% output voltage tolerance at 25°C, and 1.2mA typical quiescent current in active mode. It operates from 2.5V to 6V input and supports output voltages from 1.22V to 5.0V via external resistor divider, targeting microprocessor core and DSP post-regulation applications.
For engineers reviewing the LD39300PT-R datasheet, LD39300PT-R pinout, LD39300PT-R application, or LD39300PT-R equivalent, this page provides verified technical context, validated pin functions, confirmed stability requirements with ceramic capacitors, real-world thermal limits (170°C shutdown), and precise inhibit logic thresholds (0.3V/2V) - all critical for low-voltage, high-current embedded power design.
Technical Context
The LD39300PT-R uses a BiCMOS process enabling load-independent quiescent current-1.2mA typ. at 3A load and ≤1µA in shutdown-making it suitable for battery-sensitive systems. Its error amplifier monitors VSENSE (ADJ pin) to regulate output via external R1/R2 feedback, supporting adjustable outputs from 1.22V to 5.0V with 1.22V internal reference.
It integrates thermal shutdown (170°C, 10°C hysteresis), current limiting (6A short-circuit protection), and logic-controlled inhibit with rail-compatible thresholds (VINH ≤0.3V = OFF, ≥2V = ON). Stability is guaranteed with ≥4.7µF ceramic output capacitor and ESR within defined region per Figure 14/15.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A guaranteed continuous - supports high-current digital loads like ARM Cortex-A cores and FPGA I/O banks. |
| Dropout Voltage | 200mV typ. @ 3A - enables regulation from 3.5V input to 3.3V output with <200mV headroom loss. |
| Quiescent Current | 1.2mA typ. @ 3A load - minimizes no-load power loss in always-on subsystems without compromising transient response. |
| Output Voltage Range | 1.22V to 5.0V adjustable - set by external R1/R2; 1.22V internal reference ensures accuracy across temperature. |
| Line Regulation | 0.04% typ. (VI = VO+1V to 6V) - maintains tight output under varying input, critical for switcher post-regulation. |
| Thermal Shutdown | 170°C junction activation with 10°C hysteresis - protects against sustained overload without latch-up. |
| Stability Capacitor | ≥4.7µF ceramic CO with ESR in defined range (Fig.14/15) - eliminates need for tantalum; reduces board area and cost. |
Pinout & Package
LD39300PT-R is housed in a PPAK-5 (Power Package) thermally enhanced surface-mount package with exposed thermal pad (D2PAK-compatible footprint), optimized for high-power dissipation in space-constrained PCB layouts. RthJC = 8°C/W enables >2W continuous operation with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINH | Inhibit Control Input | Active-high enable: ≥2V = ON, ≤0.3V = OFF (≤1µA quiescent); must not float; requires external pull-up/down. |
| VI | Input Voltage Supply | 2.5V–6V DC input; requires ≥1µF ceramic capacitor placed ≤1cm from pin with dedicated ground return. |
| VO | Regulated Output | Adjustable output (1.22–5.0V); requires ≥4.7µF ceramic capacitor with ESR matching stability region (Fig.14). |
| GND | Power Ground | Common reference for VI, VO, VINH, and ADJ; must connect directly to low-impedance ground plane. |
| ADJ (VSENSE) | Feedback Input | Connects to resistor divider midpoint; senses output voltage; sets VO = 1.22V × (1 + R1/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 200mV @ 3A enables efficient 3.3V/2.5V/1.8V regulation from single-cell Li-ion or buck converter rails. |
| BiCMOS Quiescent Optimization | 1.2mA IQ independent of load ensures consistent efficiency from light to full load-no bias current scaling needed. |
| Fast Load Transient Response | 20µs turn-on/off timing (TD-ON/TD-OFF) and low output impedance support dynamic CPU DVFS transitions. |
| Ceramic-Capacitor Stability | No ESR minimum required-supports low-ESR MLCCs down to 10mΩ, reducing BOM count and PCB area vs. tantalum. |
| Logic-Compatible Inhibit | VINH thresholds (0.3V/2V) interface directly with 1.8V/3.3V GPIO without level-shifting-simplifies system power sequencing. |
Applications
| Microprocessor Core Supply | DSP Power Rail |
|---|---|
|
Use Scenario: Providing clean, low-noise 1.2V–1.5V supply to ARM Cortex-A series SoCs during dynamic frequency scaling. IC Role / Device Role / Timing Role: Primary core LDO regulating CPU VDD from intermediate 3.3V rail; handles rapid 10mA–3A load steps. Use Value: 20µs transient response and 100µVRMS noise ensure stable execution during DVFS transitions without voltage droop-induced crashes. |
Use Scenario: Delivering tightly regulated 1.8V or 2.5V to TI C6000 or Analog Devices SHARC DSPs in audio processing systems. IC Role / Device Role / Timing Role: Post-regulator after wide-input buck converter; rejects switching noise via 65dB SVR at 120Hz. Use Value: High PSRR and low dropout preserve signal integrity in analog front-end interfaces and ADC reference paths. |
| Industrial PLC I/O Module | Automotive Infotainment PMIC Sub-Rail |
|
Use Scenario: Generating isolated 3.3V logic rail for RS-485 transceivers and microcontroller peripherals in factory-floor controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator with thermal shutdown (170°C) and -40°C to 125°C operation. Use Value: Guaranteed 3A output and robust overtemperature protection ensure uninterrupted operation in unventilated enclosures. |
Use Scenario: Supplying configurable 1.22–5.0V sub-rails for display backlight drivers or USB PHYs in head-unit designs. IC Role / Device Role / Timing Role: Adjustable LDO controlled via MCU GPIO (VINH) for flexible rail sequencing and sleep-mode current reduction. Use Value: ≤1µA shutdown current and rail-compatible inhibit simplify low-power state management without auxiliary circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS7A8300RGRT | Lower IQ (1.6µA shutdown), higher PSRR (75dB @ 1kHz), but 500mV dropout @ 3A and DFN package only. | Preferred for ultra-low-power battery systems; less suitable for high-current, low-headroom inputs. | Select when shutdown IQ < 2µA is mandatory and input headroom ≥0.5V is available. |
| Analog Devices ADM7172ACPZ-R7 | Higher accuracy (±0.5%), lower noise (4.5µVRMS), but fixed-output only and 350mV dropout @ 2A. | Used where precision and noise dominate over adjustability and dropout; no ADJ pin support. | Select when output voltage is fixed and sub-5µVRMS noise is required for RF/analog circuits. |
Compared with TPS7A8300RGRT and ADM7172ACPZ-R7, LD39300PT-R uniquely balances 3A capability, 200mV dropout, adjustable output, and PPAK thermal performance-making it optimal for cost-sensitive, high-current industrial and automotive post-regulation where flexibility and thermal robustness are prioritized over ultra-low noise or sub-µA shutdown.
Availability
LD39300PT-R is available at Aetrix Electronics and suitable for microprocessor core supplies, DSP power rails, industrial PLC I/O modules, and automotive infotainment sub-rails requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for LD39300PT-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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The LD39300 belongs to ST's high-current LDO portfolio, engineered specifically for low-dropout, high-efficiency post-regulation in space-constrained embedded systems operating across -40°C to 125°C.
FAQ
What is the minimum output capacitance required for stability with LD39300PT-R?
The LD39300PT-R requires a minimum 4.7µF ceramic output capacitor for guaranteed stability across temperature and load. The capacitor's ESR must fall within the region defined in Figures 14 and 15 of the datasheet-typically 1mΩ to 100mΩ for 4.7µF-and must be placed ≤1cm from VO and GND pins with a dedicated low-impedance ground return path.
Can LD39300PT-R be used with a 2.5V input to deliver 2.5V output?
No-LD39300PT-R cannot sustain regulation at zero dropout. With 2.5V input, maximum stable output is approximately 2.3V (accounting for 200mV typical dropout at full load and 400mV max over temperature). For 2.5V output, minimum recommended input is 2.7V to ensure margin across process, voltage, and temperature variation.
How does the inhibit function behave during power-up?
The inhibit pin (VINH) has no internal pull-up or pull-down. If left floating during power-up, the device enters undefined state and may oscillate or fail to enable. To ensure reliable startup, VINH must be externally pulled to VI (for always-on) or driven by a sequenced GPIO that asserts ≥2V only after VI stabilizes above 2.5V.
Is LD39300PT-R qualified for automotive applications?
LD39300PT-R is specified for -40°C to 125°C junction temperature and meets AEC-Q100 stress test requirements per ST's product documentation. While not branded "automotive grade" in marketing, its operating range, thermal shutdown, and robust construction make it suitable for under-hood and infotainment applications-subject to customer qualification per ISO/TS 16949 processes.
LD39300PT-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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 5V
- 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
LD39300PT-R FAQ
1.How can I place an order for LD39300PT-R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD39300PT-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 LD39300PT-R reliable?
The price and inventory of LD39300PT-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39300PT-R is usually 5 days.
3.What payment methods are accepted for LD39300PT-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39300PT-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD39300PT-R?
LD39300PT-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD39300PT-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 LD39300PT-R?
For technical support, including LD39300PT-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39300PT-R requirements.
6.How does Aetrix verify that LD39300PT-R is sourced from the original manufacturer or authorized distributors?
All LD39300PT-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 LD39300PT-R meets industry standards.
7.What is the process for return or replacement of LD39300PT-R?
All LD39300PT-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39300PT-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 LD39300PT-R part is unused and in its original packaging.
Return procedure for LD39300PT-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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