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STMicroelectronics LD39080DT33-R
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- Part No.:
- LD39080DT33-R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LD39080DT33-R.pdf
- Description:
- IC REG LINEAR 3.3V 800MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,550
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Product details
Overview
LD39080DT33-R from STMicroelectronics is an ultra-low-dropout BiCMOS linear voltage regulator delivering 0.8 A output current with 150 mV typical dropout at full load, ±1.5% output voltage tolerance at 25 °C, and 1 µA max off-mode quiescent current. It operates from 2.5 V to 6 V input, provides fixed 3.3 V output, and is optimized for microprocessor and DSP core power in space-constrained industrial and automotive control units.
For engineers reviewing the LD39080DT33-R datasheet, LD39080DT33-R pinout, LD39080DT33-R application, or LD39080DT33-R equivalent, key selection criteria include guaranteed 0.8 A load capability, ceramic-capacitor stability, logic-controlled shutdown, thermal/current protection, and PPAK package thermal performance (RthJC = 8 °C/W).
Technical Context
The LD39080DT33-R integrates a BiCMOS pass transistor and error amplifier enabling ultra-low quiescent current independent of load, with fast transient response to line/load steps. Its internal current limiting (1.6 A short-circuit) and thermal shutdown (170 °C trip with 10 °C hysteresis) ensure robust operation under fault conditions.
It features a dedicated inhibit input (VINH) with defined thresholds (≤0.3 V for OFF, ≥2 V for ON), no internal pull-up/down, requiring explicit biasing. Stability is ensured with ≥2.2 µF ceramic output capacitor and ≤1 cm trace length to ground pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 0.8 A guaranteed - supports high-current digital cores without derating at 125 °C junction. |
| Dropout voltage | 150 mV typ. @ 0.8 A - enables 3.3 V output from 3.45 V input, critical for battery-backed systems. |
| Quiescent current | 1 mA typ. @ 0.8 A / 1 µA max. off-mode - minimizes standby power in always-on subsystems. |
| Output voltage tolerance | ±1.5% @ 25 °C - ensures reliable logic-level compliance for 3.3 V I/O interfaces. |
| Input voltage range | 2.5 V to 6 V - compatible with Li-ion, 5 V rails, and post-regulation after buck converters. |
| Operating temperature | −40 °C to +125 °C - qualified for under-hood automotive and industrial motor drive environments. |
| Supply rejection | 65 dB @ 120 Hz - suppresses ripple from upstream switching regulators in hybrid power architectures. |
Pinout & Package
LD39080DT33-R uses the thermally enhanced PPAK-5 (5-pin exposed pad) package, with 2.4 mm × 5.4 mm footprint and 0.2 mm solder mask defined thermal pad for low RthJC (8 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VINH | Inhibit control input | Active-high enable: ≥2 V turns regulator on; ≤0.3 V forces <1 µA shutdown current; must not float. |
| 2 - VI | Input voltage supply | Accepts 2.5–6 V; requires 1 µF ceramic capacitor placed ≤1 cm from pin with direct analog ground return. |
| 3 - GND | Analog/digital common ground | Reference node for all internal circuitry; connects to thermal pad for heat dissipation path. |
| 4 - VO | Regulated 3.3 V output | Delivers up to 0.8 A; requires ≥2.2 µF ceramic capacitor with ESR in stable region per Figure 15/16. |
| 5 - ADJ | Feedback reference node | Internally tied to 1.22 V bandgap; unused in fixed 3.3 V version (LD39080DT33-R), left unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 150 mV @ 0.8 A enables operation with minimal headroom-critical for single-cell Li-ion or low-voltage FPGA core rails. |
| Ceramic capacitor stability | Stable with ≥2.2 µF X7R/X5R ceramics-eliminates need for bulk electrolytics and reduces board area/cost. |
| Logic-controlled shutdown | VINH pin allows system-level power sequencing and deep-sleep mode activation without external FETs. |
| Integrated protection | Current limit (1.6 A) and thermal shutdown (170 °C) prevent damage during overloads or poor heatsinking. |
| BiCMOS process | Enables 1 µA off-state and 1 mA on-state IQ across full load range-no efficiency penalty at light loads. |
Applications
| Microprocessor Core Supply | DSP Power Rail |
|---|---|
|
Use Scenario: Providing clean, low-noise 3.3 V to ARM Cortex-M7 core in real-time industrial PLC controller. IC Role / Device Role / Timing Role: Primary linear post-regulator following a 5 V buck converter, supplying CPU VDD_CORE with fast load transient response. Use Value: 15 µs turn-on/off timing and 100 µVRMS output noise prevent clock jitter and core reset during burst processing. |
Use Scenario: Powering TI C6000-series DSP I/O banks in radar signal processing module. IC Role / Device Role / Timing Role: Low-dropout LDO ensuring stable 3.3 V despite input ripple from shared 5 V bus with motor drivers. Use Value: 65 dB PSRR at 120 Hz suppresses switching noise, maintaining ADC SNR > 72 dBFS in mixed-signal chain. |
| Automotive Body Control Module | Industrial Sensor Hub |
|
Use Scenario: Regulating 3.3 V for CAN transceiver and microcontroller in door module operating at −40 °C to 125 °C. IC Role / Device Role / Timing Role: High-reliability linear regulator with automotive-grade temp range and integrated thermal protection. Use Value: Guaranteed 0.8 A output and ±3% tolerance over full temperature range ensures CAN PHY compliance across ambient extremes. |
Use Scenario: Powering MEMS accelerometer, temperature sensor, and BLE SoC in predictive maintenance edge node. IC Role / Device Role / Timing Role: Ultra-low-IQ regulator enabling 10-year battery life in sleep mode while supporting rapid wake-up bursts. Use Value: 1 µA off-mode current and 1 mA active IQ extend coin-cell lifetime beyond 8 years at 1% duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM10833DCQ | 0.5 A output, 250 mV dropout @ 0.5 A, 2.5 µA quiescent current in shutdown | Limited to lower current loads; higher dropout reduces usable input range | Select when board space is constrained and peak load ≤0.5 A; verify thermal margin with RthJA = 150 °C/W. |
| MCP1826T-3302E/DB | 1 A output, 350 mV dropout @ 1 A, 120 µA quiescent current in shutdown | Higher IQ in shutdown increases battery drain; wider dropout limits low-VIN operation | Choose for higher current headroom where input voltage ≥4.0 V and off-time is brief. |
Compared with LD39080DT33-R, TSM10833DCQ offers smaller footprint but sacrifices 37.5% output current and adds 100 mV dropout; MCP1826T-3302E/DB delivers more current but triples off-mode IQ and degrades efficiency in battery-critical designs.
Availability
LD39080DT33-R is available at Aetrix Electronics and suitable for microprocessor power supply, DSP power rail, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LD39080DT33-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 smart driving, power management, and embedded processing.
LD39080 belongs to ST's high-performance LDO portfolio targeting low-noise, low-dropout power regulation in automotive and industrial applications where reliability, thermal robustness, and precision voltage accuracy are mandatory.
FAQ
What is the maximum allowable input voltage for LD39080DT33-R?
The absolute maximum DC input voltage is 6.5 V, but the recommended operating range is 2.5 V to 6 V per datasheet Section 4. Exceeding 6 V risks permanent damage due to internal junction breakdown, even briefly. For 12 V automotive systems, a pre-regulator stage is required before this LDO.
Can LD39080DT33-R be used without an output capacitor?
No. An output capacitor ≥2.2 µF with appropriate ESR is mandatory for stability, as confirmed in Section 7.3 and Figure 15–16 of the datasheet. Omitting it causes oscillation and potential device failure. Ceramic capacitors are preferred; tantalum may be used if ESR falls within the stable region.
Is the ADJ pin used in the LD39080DT33-R fixed-output variant?
No. The LD39080DT33-R is the fixed 3.3 V version; its ADJ pin is internally connected to the 1.22 V reference and must remain unconnected on the PCB. Only the adjustable versions (e.g., LD39080PT-R) require external resistor dividers on ADJ.
How does the thermal shutdown behave during sustained overload?
Thermal shutdown activates at 170 °C junction temperature with 10 °C hysteresis, latching off until die cools to ~160 °C. This protects against sustained overcurrent or inadequate heatsinking. Recovery is automatic-no external reset is needed-but repeated cycling indicates insufficient thermal design or excessive ambient temperature.
LD39080DT33-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 2.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 65dB ~ 55dB (120Hz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LD39080DT33-R FAQ
1.How can I place an order for LD39080DT33-R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD39080DT33-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 LD39080DT33-R reliable?
The price and inventory of LD39080DT33-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39080DT33-R is usually 5 days.
3.What payment methods are accepted for LD39080DT33-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39080DT33-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD39080DT33-R?
LD39080DT33-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD39080DT33-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 LD39080DT33-R?
For technical support, including LD39080DT33-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39080DT33-R requirements.
6.How does Aetrix verify that LD39080DT33-R is sourced from the original manufacturer or authorized distributors?
All LD39080DT33-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 LD39080DT33-R meets industry standards.
7.What is the process for return or replacement of LD39080DT33-R?
All LD39080DT33-R units undergo pre-shipment inspection (PSI). If there is an issue with LD39080DT33-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 LD39080DT33-R part is unused and in its original packaging.
Return procedure for LD39080DT33-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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