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STMicroelectronics LD29080PT18R
- Part No.:
- LD29080PT18R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LD29080PT18R.pdf
- Description:
- IC REG LINEAR 1.8V 800MA PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,341
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Product details
Overview
LD29080PT18R from STMicroelectronics is a fixed-output 1.8 V, 800 mA low-dropout linear regulator in PPAK 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 FPGA core rails, microcontroller I/O supplies, and battery-powered embedded systems requiring ultra-low dropout and low quiescent current.
For engineers reviewing the LD29080PT18R datasheet, LD29080PT18R pinout, LD29080PT18R application, or LD29080PT18R equivalent, key selection criteria include dropout voltage at 800 mA, thermal resistance (RthJC = 8 °C/W), shutdown control interface compatibility, and output noise (72 µVRMS) in sensitive analog/digital mixed-signal domains.
Technical Context
The LD29080PT18R implements a high-accuracy bandgap reference with internal error amplifier and PMOS pass transistor, enabling stable regulation down to 0.4 V input–output differential at 800 mA. Its inhibit function requires external pull-up ≥2 V to maintain ON state, with no internal pull-up - a critical design constraint for power sequencing.
Thermal protection and current limiting are fully integrated, with junction-to-case thermal resistance of 8 °C/W in PPAK ensuring reliable operation up to 125 °C ambient when properly heatsinked. Output stability is guaranteed with 10 µF ceramic output capacitor, per Figure 17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.8 V ±1% (1.782–1.818 V) across –40 to +125 °C - ensures compliance with 1.8 V FPGA core and LPDDR I/O supply tolerances. |
| Max output current | 800 mA guaranteed - supports single-rail powering of mid-complexity microcontrollers or sensor hubs without external current boosting. |
| Dropout voltage | 0.4 V typ. at 800 mA - enables operation from 2.2 V input (e.g., single LiFePO₄ cell or buck-boost pre-regulator output). |
| Quiescent current | 14–35 mA at 800 mA load - balances efficiency vs. transient response; drops to 130–180 µA in shutdown mode. |
| Output noise | 72 µVRMS (10 Hz–100 kHz) - suitable for powering ADC reference buffers and RF front-end bias rails without added filtering. |
| Supply rejection | 62–72 dB at 120 Hz - suppresses ripple from upstream switching converters in post-regulation applications. |
| Shutdown control | Inhibit pin requires ≥2 V logic-high to enable; no internal pull-up - mandates external bias network for controlled power sequencing. |
Pinout & Package
LD29080PT18R uses the PPAK (Power Package) thermally enhanced surface-mount package (6-pin, 6.0 × 6.4 mm body, 0.23 mm max A2 height), optimized for high-power density and low thermal resistance (RthJC = 8 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INHIBIT | Active-high enable input; must be pulled ≥2 V externally - open-circuit or <0.8 V forces shutdown; no internal pull-up. |
| 2 | VI (Input) | Main power input (2.5–13 V); includes overvoltage shutdown above 14 V - protects against input transients. |
| 3 | GND | Power ground reference for regulator feedback and shutdown circuitry - requires low-inductance connection to minimize noise coupling. |
| 4 | VO (Output) | Regulated 1.8 V output; requires ≥2 mA minimum load to prevent leakage-induced voltage rise across temperature range. |
| 5 | NC | No connect - not bonded internally; must remain unconnected per datasheet Table 2 footnote 1. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 0.4 V typ. at 800 mA enables use with marginal input margins - critical for battery discharge curves and multi-rail sequencing. |
| Thermal & current protection | Internally limits output current and shuts down at safe junction temperature - eliminates need for external foldback or thermal sensors. |
| High accuracy output | ±1% initial tolerance over –40 to +125 °C ensures system-level timing margin compliance without calibration. |
| Low-noise regulation | 72 µVRMS output noise meets requirements for precision analog subsystems powered from same rail as digital logic. |
| Logic-controlled shutdown | EN-compatible inhibit pin allows synchronized power-down with system controller - reduces standby power to <0.2 mA. |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Powering ARM Cortex-M7 microcontroller core and I/O banks in industrial edge node. IC Role / Device Role / Timing Role: Primary 1.8 V LDO supplying CPU core, memory interface, and peripheral I/O - maintains voltage stability during burst-mode execution. Use Value: 0.4 V dropout allows direct regulation from 2.2 V buck converter output, minimizing conversion stages and improving overall system efficiency by ~3%. |
Use Scenario: Post-regulation stage after DC/DC converter in portable medical sensor module. IC Role / Device Role / Timing Role: Clean 1.8 V supply for low-noise analog front-end (AFE) and SAR ADC reference buffer. Use Value: 72 µVRMS noise and 72 dB PSRR suppress switching ripple from upstream 1.2 MHz buck, eliminating need for additional LC filtering. |
| Application 3 | Application 4 |
Use Scenario: FPGA configuration and I/O bank supply in compact test equipment. IC Role / Device Role / Timing Role: Fixed 1.8 V rail for Spartan-7 FPGA I/O banks and configuration logic - requires tight voltage tolerance and fast load transient response. Use Value: ±1% output accuracy and 10 µF-stable design ensure setup/hold timing margins remain intact across temperature and line variations. |
Use Scenario: Battery-backed real-time clock (RTC) and SRAM retention supply in automotive telematics unit. IC Role / Device Role / Timing Role: Low-quiescent LDO delivering 1.8 V from 3.3 V main rail during ignition-off sleep mode. Use Value: 130–180 µA shutdown current extends coin-cell or supercapacitor backup runtime beyond 3 months under nominal conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | 1.8 V fixed, 800 mA, 0.25 V dropout (typ.), SOT-23-5 package, no shutdown pin. | Lacks inhibit control; smaller package limits thermal performance at full load. | Select when board space is constrained and shutdown sequencing is handled externally or not required. |
| ON Semiconductor NCP1117ST18T3G | 1.8 V fixed, 1 A, 1.2 V dropout (min.), TO-220/SOT-223, no shutdown, higher IQ (6 mA min). | Higher dropout restricts use with low-input sources; no enable function limits power management flexibility. | Select when cost sensitivity outweighs efficiency needs and thermal headroom is ample. |
Compared with XC6210B182MR-G and NCP1117ST18T3G, LD29080PT18R uniquely combines ultra-low dropout (0.4 V), integrated shutdown control, and PPAK thermal performance - making it optimal for space-constrained, battery-sensitive, and thermally demanding 1.8 V rail designs.
Availability
LD29080PT18R is available at Aetrix Electronics and suitable for FPGA power delivery, microcontroller I/O regulation, and portable medical device power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LD29080PT18R 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 dropout voltage, noise, and enable control are critical.
FAQ
What is the minimum load current required for stable operation?
The LD29080PT18R requires a minimum load current of 2 mA across its full operating temperature range (–40 to +125 °C) to prevent output voltage rise caused by internal leakage currents. This is specified in Note 4 of Table 6 and applies regardless of input voltage or load transients.
Can the INHIBIT pin be left floating?
No - the INHIBIT pin has no internal pull-up and must be actively driven to ≥2 V to maintain regulation. Leaving it floating results in undefined behavior and likely forces the device into shutdown mode due to leakage paths. A dedicated pull-up resistor to VI or system VCC is mandatory.
What output capacitor is required for stability?
A minimum 10 µF ceramic output capacitor is required for stability, as confirmed in Figure 17 (Stability vs. CO) and Section 4 electrical test conditions. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR and aging effects that may compromise phase margin.
Does LD29080PT18R support adjustable output configurations?
No - LD29080PT18R is a fixed 1.8 V output variant. Adjustable versions (e.g., LD29080PTR) use the ADJ pin and external resistor divider; the PT18R variant has ADJ pin internally disconnected (NC), as stated in Table 2 footnote 1 and Figure 2 schematic.
LD29080PT18R 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 800mA
- Current - Output:
- 800mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 35 mA
- PSRR:
- 72dB (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
LD29080PT18R FAQ
1.How can I place an order for LD29080PT18R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29080PT18R 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 LD29080PT18R reliable?
The price and inventory of LD29080PT18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29080PT18R is usually 5 days.
3.What payment methods are accepted for LD29080PT18R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29080PT18R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29080PT18R?
LD29080PT18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29080PT18R 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 LD29080PT18R?
For technical support, including LD29080PT18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29080PT18R requirements.
6.How does Aetrix verify that LD29080PT18R is sourced from the original manufacturer or authorized distributors?
All LD29080PT18R 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 LD29080PT18R meets industry standards.
7.What is the process for return or replacement of LD29080PT18R?
All LD29080PT18R units undergo pre-shipment inspection (PSI). If there is an issue with LD29080PT18R, 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 LD29080PT18R part is unused and in its original packaging.
Return procedure for LD29080PT18R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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