My Inquiry
My Account
STMicroelectronics LD29080PT50R
- Part No.:
- LD29080PT50R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LD29080PT50R.pdf
- Description:
- IC REG LINEAR 5V 800MA PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,211
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LD29080PT50R from STMicroelectronics is a fixed-output, 5.0 V, 800 mA low-dropout linear regulator in PPAK package with 0.4 V typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable post-regulation for DC-DC converter outputs and powers microcontroller cores in battery-backed industrial controllers.
For engineers reviewing the LD29080PT50R datasheet, LD29080PT50R pinout, LD29080PT50R application, or LD29080PT50R equivalent, key selection criteria include dropout voltage at 800 mA, quiescent current across load range, thermal resistance (RthJA = 100 °C/W), and inhibit input compatibility with 2 V logic-high threshold.
Technical Context
The LD29080PT50R integrates internal current limiting and thermal shutdown circuitry, with an inhibit pin (INHIBIT) requiring ≥2 V to maintain regulation-no internal pull-up exists. Its reference voltage (1.23 V typ.) sets the fixed 5.0 V output via internal resistor divider, eliminating external feedback components.
Designed for medium-current loads, it operates from 6 V to 13 V input while maintaining regulation down to 0.4 V headroom at 800 mA. Output noise is 180 µVRMS (10 Hz–100 kHz), and supply voltage rejection reaches 64 dB at 120 Hz with 400 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5.0 V ±1% (4.95–5.05 V) over –40 to +125 °C; enables direct powering of 5 V logic without trimming. |
| Max output current | 800 mA guaranteed; supports single-rail MCU power domains and sensor interface circuits. |
| Dropout voltage | 0.4 V typ. at 800 mA; allows operation from 5.4 V input in battery systems with >10% voltage margin. |
| Quiescent current | 14–35 mA at 800 mA load; balances efficiency vs. transient response in always-on subsystems. |
| Supply rejection | 64 dB min. at 120 Hz, 400 mA load; suppresses ripple from upstream switching regulators. |
| Output noise | 180 µVRMS (10 Hz–100 kHz); suitable for analog front-ends and precision ADC references. |
| Inhibit threshold | VIH = 2 V min.; compatible with 3.3 V GPIO without level-shifting. |
Pinout & Package
LD29080PT50R uses the PPAK (Power Package) thermally enhanced surface-mount package (6.0 × 6.6 × 2.4 mm), optimized for high-power density and low junction-to-ambient thermal resistance (RthJA = 100 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INHIBIT) | Enable control input | Active-high logic input; must be tied ≥2 V to enable regulation; no internal pull-up. |
| 2 (VI) | Input voltage supply | Accepts 6–13 V DC; internal protection limits operation above 14 V to shutdown mode. |
| 3 (GND) | Ground reference | Common return for input, output, and control; requires low-impedance PCB plane for stability. |
| 4 (VO) | Regulated output | Delivers 5.0 V ±1%; requires 10 µF ceramic output capacitor for stability per datasheet. |
| 5 (N.C.) | No connection | Not bonded; left floating-no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.4 V typ. at 800 mA enables use in 5.5 V input systems where legacy LDOs fail. |
| Fixed 5.0 V output | ±1% accuracy over –40 to +125 °C eliminates need for external feedback resistors or calibration. |
| Logic-controlled shutdown | Inhibit pin accepts standard 3.3 V logic; draws only 5–10 µA when disabled. |
| Integrated protection | Internal current limit (1.2 A) and thermal shutdown prevent damage during overload or poor heatsinking. |
| Low-noise regulation | 180 µVRMS output noise supports noise-sensitive analog circuits without added filtering. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powers isolated CAN transceiver and digital I/O drivers from a 12 V rail after buck conversion. IC Role / Device Role / Timing Role: Post-regulator providing clean, stable 5 V to interface ICs with tight noise and dropout requirements. Use Value: 0.4 V dropout ensures regulation remains active even as 12 V bus sags to 6.5 V during cold-crank events. |
Use Scenario: Supplies 5 V to microcontroller core and LIN transceivers in door module electronics. IC Role / Device Role / Timing Role: Primary LDO for safety-critical subsystem; enabled/disabled via vehicle ECU GPIO. Use Value: 2 V inhibit threshold matches automotive 3.3 V domain logic; 100 °C/W RthJA allows operation up to +105 °C ambient without heatsink. |
| Battery-Powered Data Logger | Set-Top Box Power Management |
|
Use Scenario: Regulates output of boost converter (from 2×AA) to 5 V for MCU and SD card interface. IC Role / Device Role / Timing Role: Low-quiescent, low-dropout regulator enabling extended battery life and deep discharge operation. Use Value: 130–180 µA shutdown current preserves battery during sleep; 0.4 V dropout extends usable cell voltage down to 3.0 V. |
Use Scenario: Provides 5 V standby rail for HDMI CEC and remote wake-up circuitry in consumer media devices. IC Role / Device Role / Timing Role: Always-on LDO with logic-controlled enable synchronized to system power state transitions. Use Value: 5 µA inhibit leakage ensures <1 µA total system standby current; ±1% output tolerance meets HDMI compliance specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV7555PDBVR | 500 mA max output; 0.22 V dropout at 500 mA; 25 µA quiescent current in active mode. | Limited to lower-current loads; better suited for ultra-low-power IoT sensors than industrial 800 mA rails. | Select if system load ≤500 mA and sub-30 µA active IQ is critical; not drop-in due to lower current rating. |
| MCP1703T-5002E/MB | 250 mA max output; 0.6 V dropout at 250 mA; RthJA = 150 °C/W in SOT-223. | Thermal derating begins earlier; unsuitable for sustained 800 mA in compact enclosures. | Choose only for cost-sensitive, low-power designs where thermal margin exceeds 25 °C and peak load <300 mA. |
Compared with TLV7555PDBVR and MCP1703T-5002E/MB, LD29080PT50R uniquely supports 800 mA continuous load with 0.4 V dropout and 100 °C/W thermal resistance in PPAK-making it the sole option among the three for thermally constrained, high-current 5 V regulation.
Availability
LD29080PT50R is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, battery-powered data loggers, and set-top box standby power requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LD29080PT50R 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
The LD29080 series belongs to ST's high-accuracy, medium-current LDO portfolio, designed specifically for post-regulation in space-constrained systems where ultra-low dropout and thermal robustness are mandatory.
FAQ
What is the minimum input voltage required for LD29080PT50R to regulate 5.0 V at 800 mA?
The minimum input voltage is 5.4 V, calculated as VO + VDROP = 5.0 V + 0.4 V (typical dropout at 800 mA). The device guarantees regulation down to this headroom across –40 to +125 °C, provided input does not exceed 13 V maximum operating voltage.
Does LD29080PT50R require an external capacitor on the INHIBIT pin?
No external capacitor is required on the INHIBIT pin. It is a CMOS-compatible digital input with 5–10 µA leakage current; a simple pull-up to 3.3 V or direct GPIO connection suffices. Datasheet Figure 4 confirms no filtering or decoupling is specified for this terminal.
Can LD29080PT50R be used without a load?
No. A minimum load current of 2 mA is mandatory to prevent output voltage rise due to internal leakage, as explicitly stated in Note 4 of Tables 5–12. Applications must ensure ≥2 mA sink (e.g., pull-down resistor or downstream bias) across all operating temperatures.
What is the recommended output capacitor for stability?
A 10 µF ceramic capacitor (X5R/X7R, 6.3 V rated) is required on VO per Table 5 test conditions and Figure 17 (stability vs. CO). Equivalent series resistance (ESR) should be <100 mΩ; tantalum or aluminum electrolytics are not recommended due to higher ESR and aging effects.
LD29080PT50R 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):
- 13V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 35 mA
- PSRR:
- 64dB (120Hz)
- 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
LD29080PT50R FAQ
1.How can I place an order for LD29080PT50R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29080PT50R 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 LD29080PT50R reliable?
The price and inventory of LD29080PT50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29080PT50R is usually 5 days.
3.What payment methods are accepted for LD29080PT50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29080PT50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29080PT50R?
LD29080PT50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29080PT50R 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 LD29080PT50R?
For technical support, including LD29080PT50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29080PT50R requirements.
6.How does Aetrix verify that LD29080PT50R is sourced from the original manufacturer or authorized distributors?
All LD29080PT50R 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 LD29080PT50R meets industry standards.
7.What is the process for return or replacement of LD29080PT50R?
All LD29080PT50R units undergo pre-shipment inspection (PSI). If there is an issue with LD29080PT50R, 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 LD29080PT50R part is unused and in its original packaging.
Return procedure for LD29080PT50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD29080PT50R Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
