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STMicroelectronics LD29300V18
- Part No.:
- LD29300V18
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD29300V18.pdf
- Description:
- IC REG LINEAR 1.8V 3A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,536
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Product details
Overview
LD29300V18 from STMicroelectronics is a fixed-output, 1.8 V, 3 A low-dropout linear regulator with ±1% output voltage tolerance at 25°C, 0.4 V typical dropout at 3 A, and logic-controlled electronic shutdown. It operates across –40°C to +125°C junction temperature and delivers stable power for FPGA core rails in battery-powered embedded systems.
For engineers reviewing the LD29300V18 datasheet, LD29300V18 pinout, LD29300V18 application, or LD29300V18 equivalent, key selection criteria include guaranteed 3 A output current, sub-0.5 V dropout at full load, thermal/current protection, and compatibility with 10 µF ceramic output capacitance in space-constrained industrial power supplies.
Technical Context
This LDO employs internal PNP pass transistor architecture enabling ultra-low dropout and high PSRR (62–72 dB at 120 Hz). Its integrated inhibit function accepts TTL/CMOS-compatible control signals (VIL ≤ 0.8 V, VIH ≥ 2 V) for precise system-level power sequencing.
Thermal protection activates at ~150°C junction temperature, and current limiting caps short-circuit output at 4.5 A. Ground current remains below 100 mA at 3 A load, supporting efficiency-critical portable applications without compromising transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±1% (±18 mV) over –40°C to +125°C - ensures reliable FPGA core biasing within JEDEC Class 3A voltage margin. |
| Dropout Voltage | 0.4 V typ. at 3 A - enables operation from 2.2 V input, critical for single-cell Li-ion or buck-LDO hybrid architectures. |
| Output Current | Guaranteed 3 A continuous - supports high-current digital loads including ARM SoCs and DDR memory termination. |
| PSRR | 62–72 dB at 120 Hz - suppresses ripple from upstream switching regulators, reducing need for additional filtering stages. |
| Quiescent Current | 45–100 mA at 3 A load - balances low-noise regulation with thermal management in sealed enclosures. |
| Shutdown Control | TTL/CMOS-compatible inhibit pin (VIL ≤ 0.8 V, VIH ≥ 2 V) - enables clean power-down sequencing in multi-rail systems. |
| Noise | 60 µVRMS (10 Hz–100 kHz) - meets noise-sensitive analog supply requirements for ADC reference or PLL VCO rails. |
Pinout & Package
LD29300V18 is packaged in D2PAK (TO-263) surface-mount housing with exposed thermal pad for enhanced heat dissipation. Thermal resistance junction-to-case is 3°C/W, enabling >2 W continuous power delivery with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.5 V to 30 V DC; must be ≥ VO + VDROP for regulation - minimum 2.2 V input required for 1.8 V output at 3 A. |
| OUT | Regulated output | Delivers stable 1.8 V ±1%; requires ≥10 µF ceramic output capacitor for stability per datasheet Figure 11. |
| GND | Power ground reference | Low-impedance return path for load and control currents; must be routed with minimal inductance to avoid instability. |
| INH | Inhibit control input | Active-low enable: <0.8 V = OFF (high-Z output), >2 V = ON; draws ≤10 µA - compatible with microcontroller GPIO. |
| Tab | Thermal pad / case | Internally connected to GND; must be soldered to PCB copper pour for thermal conduction and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.4 V typ. at 3 A load - extends battery runtime and enables use with low-headroom input sources. |
| High accuracy output | ±1% tolerance over temperature and load - eliminates need for external trimming in precision digital supply rails. |
| Integrated protection | Thermal shutdown + current limiting (4.5 A short-circuit) - prevents damage during fault conditions without external circuitry. |
| Logic-compatible shutdown | VIL ≤ 0.8 V / VIH ≥ 2 V - allows direct interfacing with 3.3 V or 5 V logic without level-shifting components. |
| Low noise performance | 60 µVRMS (10 Hz–100 kHz) - suitable for powering noise-sensitive analog blocks adjacent to digital cores. |
Applications
| Industrial PLC I/O Module | FPGA Core Power Supply |
|---|---|
|
Use Scenario: Providing clean 1.8 V power to FPGA configuration banks and transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary post-regulator delivering low-noise, high-current bias for Xilinx Artix-7 or Intel Cyclone V core logic. Use Value: 0.4 V dropout enables direct regulation from 3.3 V intermediate rail, reducing component count and board area vs. two-stage conversion. |
Use Scenario: Powering ARM Cortex-A9 processor cores in ruggedized edge computing gateways operating from 12 V automotive input. IC Role / Device Role / Timing Role: High-current LDO supplying stable 1.8 V to CPU core domain with fast load transient response. Use Value: 62 dB PSRR at 120 Hz attenuates switching noise from upstream 12 V → 3.3 V buck converter, preventing timing jitter in high-speed interfaces. |
| Battery-Powered Test Equipment | Medical Imaging Sensor Interface |
|
Use Scenario: Regulating power for portable oscilloscope front-end ADCs and FPGA-based signal processing units. IC Role / Device Role / Timing Role: Low-noise 1.8 V source for precision analog signal chain biasing and digital logic domains. Use Value: 60 µVRMS output noise avoids degradation of 14-bit ADC ENOB; shutdown control enables deep-sleep mode with <180 µA quiescent draw. |
Use Scenario: Supplying 1.8 V to CMOS image sensor interface ASICs in handheld ultrasound probes. IC Role / Device Role / Timing Role: Stable, low-EMI power rail for high-speed LVDS serializer/deserializer blocks. Use Value: D2PAK thermal pad enables passive cooling in sealed enclosures; ±1% tolerance ensures consistent pixel clock generation across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM1083-1.8 | 0.35 V dropout at 3 A; 120 µVRMS noise; no inhibit pin | Lacks shutdown control - unsuitable for sequenced multi-rail systems requiring power-down coordination | Select when lowest possible dropout is prioritized and system-level enable is handled externally. |
| MCP1826T-1802E/DC | 0.6 V dropout at 3 A; ±2% tolerance; 100 µVRMS noise; includes power-good flag | Higher dropout and looser tolerance reduce usable input range and margin for downstream logic | Prefer when power-good monitoring is required and 0.4 V dropout is not mandatory. |
Compared with TSM1083-1.8 and MCP1826T-1802E/DC, LD29300V18 uniquely combines 0.4 V dropout, ±1% accuracy, and logic-controlled shutdown in a thermally optimized D2PAK package - making it optimal for compact, high-reliability 1.8 V core supplies where input headroom and sequencing are constrained.
Availability
LD29300V18 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA core power supplies, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LD29300V18 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.
LD29300V18 belongs to the LD29300 series of high-current, ultra-low-dropout regulators designed specifically for post-regulation in space- and efficiency-constrained digital systems requiring precise, robust, and thermally efficient voltage conversion.
FAQ
What is the minimum input voltage required for LD29300V18 to regulate 1.8 V at 3 A?
The minimum input voltage is 2.2 V, calculated as VO + VDROP = 1.8 V + 0.4 V (typical dropout at 3 A). The absolute minimum specified in Absolute Maximum Ratings is 2.5 V across –40°C to +125°C, ensuring reliable operation under worst-case thermal and load conditions.
Can LD29300V18 be used with ceramic output capacitors?
Yes - the device is stable with ≥10 µF ceramic output capacitance, as confirmed in Figure 11 (Stability vs CO) and application circuit notes. X5R/X7R dielectrics are recommended; ESR should be ≤10 mΩ to maintain phase margin above 45°.
Does LD29300V18 require an input bypass capacitor?
Yes - a minimum 330 nF ceramic capacitor is required between IN and GND, placed as close as possible to the IN and GND pins. This reduces high-frequency input impedance and prevents oscillation during fast load transients, per datasheet Section 4 test conditions.
How does the INH pin behave during power-up?
The INH pin defaults to high-impedance until VIN reaches ~2.5 V; once powered, it samples logic level at power-on reset. To ensure defined startup, drive INH to >2 V (ON) or <0.8 V (OFF) before VIN exceeds 2.5 V - no external pull-up/down is required due to internal biasing.
LD29300V18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 50 mA
- Current - Supply (Max):
- 100 mA
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LD29300V18 FAQ
1.How can I place an order for LD29300V18 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD29300V18 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 LD29300V18 reliable?
The price and inventory of LD29300V18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD29300V18 is usually 5 days.
3.What payment methods are accepted for LD29300V18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD29300V18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD29300V18?
LD29300V18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD29300V18 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 LD29300V18?
For technical support, including LD29300V18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD29300V18 requirements.
6.How does Aetrix verify that LD29300V18 is sourced from the original manufacturer or authorized distributors?
All LD29300V18 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 LD29300V18 meets industry standards.
7.What is the process for return or replacement of LD29300V18?
All LD29300V18 units undergo pre-shipment inspection (PSI). If there is an issue with LD29300V18, 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 LD29300V18 part is unused and in its original packaging.
Return procedure for LD29300V18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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