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STMicroelectronics LD29080DT25R
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- Part No.:
- LD29080DT25R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LD29080DT25R.pdf
- Description:
- IC REG LINEAR 2.5V 800MA DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,935
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Product details
Overview
LD29080DT25R from STMicroelectronics is a fixed-output 2.5 V, 800 mA low-dropout linear regulator in DPAK package, featuring 0.4 V typical dropout at full load, ±1% output voltage accuracy over temperature, and logic-controlled electronic shutdown. It delivers stable power for microcontroller core supplies, FPGA I/O banks, and battery-powered instrumentation where low quiescent current (14–35 mA at 800 mA) and tight regulation are critical.
For engineers reviewing the LD29080DT25R datasheet, LD29080DT25R pinout, LD29080DT25R application, or LD29080DT25R equivalent, key selection criteria include dropout performance at 800 mA, thermal resistance (RthJA = 100 °C/W), shutdown control interface compatibility, and output noise (100 µVRMS) in sensitive analog subsystems.
Technical Context
The LD29080DT25R implements a PNP pass transistor architecture with internal current and thermal limiting, enabling robust operation without external protection components. Its fixed 2.5 V output is trimmed at 25 °C with ±1% tolerance maintained across –40 to +125 °C via on-chip bandgap reference and error amplifier feedback.
Shutdown is controlled by an inhibit pin requiring ≥2 V to enable operation; it draws only 130–180 µA in shutdown mode. The device supports input voltages from 3.5 V to 13 V and maintains 55–70 dB supply voltage rejection at 120 Hz with 400 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.5 V ±1% (2.475–2.525 V) at –40 to +125 °C, ensuring stable MCU core rail under thermal stress |
| Max output current | 800 mA guaranteed, supporting mid-power SoCs and multi-rail PMIC secondary stages |
| Dropout voltage | 0.4 V typ. at 800 mA (0.7 V max), enabling 2.5 V output from 3.2 V input - critical for Li-ion single-cell systems |
| Quiescent current | 14–35 mA at 800 mA load, balancing efficiency vs. transient response in always-on subsystems |
| Output noise | 100 µVRMS (10 Hz–100 kHz), suitable for ADC reference supplies and RF bias rails |
| Supply rejection | 55–70 dB at 120 Hz, suppressing ripple from upstream switching converters |
| Thermal resistance | RthJA = 100 °C/W (DPAK), enabling 800 mA operation up to +85 °C ambient with minimal heatsinking |
Pinout & Package
DPAK (TO-252) package: surface-mount, 3-pin, exposed thermal pad for enhanced heat dissipation; compatible with standard PCB reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VI | Input voltage supply | Accepts 3.5–13 V DC; must be decoupled with ≥330 nF ceramic capacitor near pin |
| 2 - GND | Ground reference and thermal path | Common return for all circuits; connects to large copper pour for thermal management |
| 3 - VO | Regulated output | Delivers 2.5 V ±1%; requires ≥10 µF low-ESR output capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.4 V typ. at 800 mA enables operation from single Li-ion (3.0–4.2 V) or 3.3 V buck output |
| Logic-controlled shutdown | Inhibit pin accepts 2–13 V to enable/disable regulator; draws only 130–180 µA in shutdown |
| Internal protection | Integrated current limit and thermal shutdown prevent damage during overload or poor heatsinking |
| High accuracy output | ±1% initial tolerance and <1% total variation over –40 to +125 °C ensures reliable digital logic margining |
| Low noise performance | 100 µVRMS output noise avoids degradation of precision ADCs and low-phase-noise oscillators |
Applications
| Microcontroller Core Supply | FPGA I/O Bank Regulation |
|---|---|
|
Use Scenario: Powering ARM Cortex-M4/M7 cores requiring clean 2.5 V at up to 600 mA peak current. IC Role / Device Role / Timing Role: Primary LDO delivering tightly regulated voltage to processor VDDCORE pins with fast load transient response. Use Value: 0.4 V dropout allows direct regulation from 3.3 V intermediate rail, reducing system BOM count and improving PSRR over switching alternatives. |
Use Scenario: Providing configurable I/O voltage for Xilinx Artix-7 or Intel Cyclone V FPGA banks operating at 2.5 V. IC Role / Device Role / Timing Role: Fixed-output LDO supplying stable termination voltage to parallel I/O interfaces (e.g., LVCMOS25). Use Value: ±1% output accuracy ensures setup/hold timing margins remain intact across temperature and load variations. |
| Battery-Powered Instrumentation | Post-Regulation for Switching Supplies |
|
Use Scenario: Powering portable multimeters and handheld oscilloscopes with 2.5 V ADC reference and analog front-end circuitry. IC Role / Device Role / Timing Role: Low-noise LDO generating precision reference rail isolated from noisy battery and digital domains. Use Value: 100 µVRMS noise floor preserves ENOB in 16-bit SAR ADCs without additional filtering stages. |
Use Scenario: Cleaning ripple from 3.3 V buck converter output feeding sensitive RF transceivers or clock buffers. IC Role / Device Role / Timing Role: Secondary LDO acting as ripple filter and voltage stabilizer downstream of primary DC/DC stage. Use Value: 55–70 dB SVR at 120 Hz suppresses switching artifacts, preventing spurious tones in RF signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM10802DTR | 2.5 V fixed, 800 mA, RthJA = 90 °C/W, higher Iq (45 mA typ. at 800 mA) | Larger dropout (0.55 V typ.) and higher noise (150 µVRMS) reduce suitability for noise-sensitive analog rails | Prefer when board space permits larger thermal pad or when higher quiescent current is acceptable for cost savings |
| AP2210K-2.5TRG1 | 2.5 V fixed, 500 mA, RthJA = 110 °C/W, lower Iq (10 mA typ. at 500 mA) | Lower current rating limits use to sub-500 mA loads; not suitable for high-current MCU cores or FPGA banks | Select only for space-constrained designs with ≤400 mA average load and no thermal derating requirements |
Compared with TSM10802DTR and AP2210K-2.5TRG1, the LD29080DT25R offers superior thermal performance (100 °C/W vs. 90/110), lowest noise (100 µVRMS), and highest guaranteed current (800 mA), making it optimal for thermally demanding, mixed-signal applications requiring both precision and power density.
Availability
LD29080DT25R is available at Aetrix Electronics and suitable for industrial control HMI panels, medical point-of-care devices, and automotive infotainment head units requiring stable component supply with long-term lifecycle assurance.
Supply support for LD29080DT25R 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 LD29080 series belongs to ST's high-accuracy, medium-current LDO portfolio, engineered specifically for post-regulation, battery-powered, and thermally constrained applications where ultra-low dropout and tight output tolerance are mandatory.
FAQ
What is the minimum input voltage required for stable 2.5 V output at 800 mA?
The LD29080DT25R requires a minimum input voltage of 2.9 V to maintain regulation at 800 mA, based on its 0.4 V typical dropout voltage. Operation below this threshold causes output collapse; datasheet specifies 3.5 V as recommended minimum for full-spec compliance across temperature and process variation.
Does the inhibit pin require a pull-up resistor for normal operation?
No external pull-up is required. The inhibit pin must be driven to ≥2 V to enable regulation; leaving it floating or connecting to GND forces shutdown. ST specifies no internal pull-up, so a dedicated voltage source (e.g., microcontroller GPIO or bias rail) is necessary for active control.
Can LD29080DT25R be used without an output capacitor?
No. The device requires a minimum 10 µF low-ESR ceramic output capacitor for stability, as confirmed in Figure 17 (Stability vs. CO) and Section 4 electrical conditions. Omitting it risks oscillation, especially under dynamic load changes, and violates absolute maximum ratings for output impedance.
How does thermal performance differ between DPAK and PPAK packages for this part?
Both DPAK and PPAK versions share identical RthJC = 8 °C/W and RthJA = 100 °C/W per Table 4. Mechanical data confirm identical thermal pad dimensions and mounting recommendations; therefore, PCB layout and copper area dominate thermal behavior - not package variant choice.
LD29080DT25R 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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 35 mA
- PSRR:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
LD29080DT25R FAQ
1.How can I place an order for LD29080DT25R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29080DT25R 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 LD29080DT25R reliable?
The price and inventory of LD29080DT25R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29080DT25R is usually 5 days.
3.What payment methods are accepted for LD29080DT25R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29080DT25R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29080DT25R?
LD29080DT25R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29080DT25R 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 LD29080DT25R?
For technical support, including LD29080DT25R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29080DT25R requirements.
6.How does Aetrix verify that LD29080DT25R is sourced from the original manufacturer or authorized distributors?
All LD29080DT25R 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 LD29080DT25R meets industry standards.
7.What is the process for return or replacement of LD29080DT25R?
All LD29080DT25R units undergo pre-shipment inspection (PSI). If there is an issue with LD29080DT25R, 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 LD29080DT25R part is unused and in its original packaging.
Return procedure for LD29080DT25R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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