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STMicroelectronics LD49150PT12R
- Part No.:
- LD49150PT12R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LD49150PT12R.pdf
- Description:
- IC REG LINEAR 1.2V 1.5A PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,777
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Product details
Overview
LD49150PT12R from STMicroelectronics is a 1.5 A ultra-low-dropout linear voltage regulator with fixed 1.2 V output, dual-supply architecture (VIN and VBIAS), ±1.5% initial output accuracy, 200 mV dropout at 1.5 A, and operation down to 1.4 V input-designed for microprocessor core voltage supply in PC add-in cards and graphics processors.
For engineers reviewing the LD49150PT12R datasheet, LD49150PT12R pinout, LD49150PT12R application, or LD49150PT12R equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints (e.g., mandatory VBIAS ≥ 3 V, VIN ≥ VO + 0.2 V), and confirmed alternative options for low-voltage core regulation.
Technical Context
The LD49150PT12R implements a dual-rail architecture: main input (VIN: 1.4–5.5 V) powers the output stage, while bias input (VBIAS: 3–6 V) independently supplies control circuitry-enabling ultra-low VIN operation without sacrificing transient response or stability. This separation reduces effective output impedance and supports up to 10 MHz bandwidth.
It features active-high enable (EN), thermal shutdown, current limiting (2.5 A), and operates across –25 °C to 125 °C junction temperature. Output stability requires ≥1 µF ceramic capacitor, and it achieves ±1% load regulation from 0–1.5 A with <0.1 %/V line regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.2 V ±1.5% at TJ = 25 °C; ±3% over –25 °C to 125 °C - ensures stable core rail for low-voltage digital ICs. |
| Max dropout (VIN–VO) | 200 mV at 1.5 A - enables efficient regulation from 1.4 V input, minimizing power loss in space-constrained designs. |
| VBIAS range | 3 V to 6 V - powers internal circuitry independently; must exceed VO by ≥2.1 V for full performance. |
| Ground current | 4–6 mA at 1.5 A load - low quiescent consumption preserves efficiency in always-on subsystems. |
| Enable threshold | VEN > 1.4 V to enable; VEN < 0.4 V to shut down - compatible with standard logic-level control signals. |
| Thermal protection | Active thermal shutdown at TJ > 150 °C - prevents damage during overload or poor heatsinking conditions. |
| Stability capacitor | ≥1 µF ceramic at VOUT - enables compact layout; 10 µF recommended for fast load transients (>100 mA/µs). |
Pinout & Package
LD49150PT12R uses the PPAK DFN6 (3×3 mm) package with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation. The 6-pin configuration supports dual-supply operation and logic-controlled shutdown.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PPAK) / 2 (DFN) | EN | Active-high enable input; ties to VIN if always-on operation required; must not float. |
| 2 (PPAK) / 3 (DFN) | VIN | Main power input (1.4–5.5 V); supplies output transistor; dropout defined relative to VOUT. |
| 3 (PPAK) / 1 (DFN) | GND | Power and signal ground; thermal tab is internally connected to GND - requires solid PCB copper pour. |
| 4 (PPAK) / 4 (DFN) | VOUT | Regulated 1.2 V output; minimum 1 µF ceramic capacitor required for stability. |
| 5 (PPAK) / 6 (DFN) | VBIAS | Bias supply input (3–6 V); powers control circuitry; must be ≥ VO + 2.1 V for full spec compliance. |
| 5 (PPAK) / N.C. (DFN) | N.C. | No internal connection; left unconnected per datasheet - no routing or pull-up/pull-down required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply architecture | Separate VIN and VBIAS rails decouple power delivery: enables 1.4 V minimum input while maintaining 10 MHz bandwidth and low noise. |
| Ultra-low dropout | 200 mV at full 1.5 A load - reduces heat generation and extends battery life in portable low-voltage systems. |
| Ceramic capacitor stability | Stable with ≥1 µF X5R/X7R ceramic output cap - eliminates need for tantalum or electrolytic, saving board space and cost. |
| Fast transient response | Up to 10 MHz closed-loop bandwidth - suppresses voltage droop during CPU burst loads (e.g., GPU core switching). |
| Integrated protection | Thermal shutdown + current limit (2.5 A) + logic-controlled shutdown - eliminates need for external fault management circuitry. |
Applications
| Graphics Processor Core Supply | PC Add-in Card Voltage Regulation |
|---|---|
|
Use Scenario: Powers GPU core logic operating at 1.2 V with dynamic current draw up to 1.5 A during rendering bursts. IC Role / Device Role / Timing Role: Primary low-noise, fast-response core regulator delivering stable 1.2 V under rapid load transients. Use Value: 200 mV dropout and 10 MHz bandwidth prevent >50 mV undershoot during 500 mA/µs load steps, avoiding GPU reset or artifacting. |
Use Scenario: Supplies 1.2 V to FPGA or ASIC on PCIe expansion cards where board space limits use of switching regulators. IC Role / Device Role / Timing Role: Fixed-output LDO replacing discrete regulator solutions; EN pin synchronized to PCIe slot power sequencing. Use Value: Dual-supply architecture allows use of 1.8 V auxiliary rail as VBIAS, enabling reliable startup even when main 3.3 V rail ramps slowly. |
| Microprocessor Core Voltage | Low-Voltage Digital IC Power |
|
Use Scenario: Provides clean 1.2 V core voltage to ARM Cortex-A series SoCs in embedded computing modules. IC Role / Device Role / Timing Role: Core rail regulator with thermal monitoring; shutdown triggered via EN during system sleep states. Use Value: ±1.5% initial accuracy and <1% load regulation ensure SoC meets AVS (Adaptive Voltage Scaling) timing margins across temperature. |
Use Scenario: Powers high-speed SerDes PHYs, DDR I/O buffers, or AI accelerator tiles requiring tightly regulated 1.2 V. IC Role / Device Role / Timing Role: Post-regulator after buck converter; cleans residual ripple and provides fast transient headroom. Use Value: 68 dB PSRR at 120 Hz and low output impedance (<10 mΩ) suppress switching noise from upstream SMPS, reducing bit error rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-dropout core voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS7A8300RGRT | 1.5 A, 1.2 V fixed, 125 mV dropout, single-supply (no VBIAS), 3 µA IQ in shutdown | Lacks dual-supply flexibility; cannot operate below 1.45 V input; better for space-constrained single-rail systems | Select when VBIAS rail is unavailable and input ≥1.45 V; trade lower dropout for reduced transient bandwidth (3 MHz vs. 10 MHz) |
| Analog Devices ADP1763ARDZ-1.2-R7 | 1.5 A, 1.2 V fixed, 180 mV dropout, single-supply, 1.2 µA shutdown current, integrated soft-start | No VBIAS dependency; simpler BOM; higher ground current (12 mA @ 1.5 A) than LD49150PT12R | Select for cost-sensitive industrial controllers where startup sequencing is less critical and thermal margin is ample |
Compared with TPS7A8300RGRT and ADP1763ARDZ-1.2-R7, LD49150PT12R uniquely supports sub-1.45 V inputs via its dual-rail architecture-critical for legacy or low-power SoCs-while delivering superior transient response for burst-mode workloads, albeit with added VBIAS routing complexity.
Availability
LD49150PT12R is available at Aetrix Electronics and suitable for graphics processor core supply, PC add-in card voltage regulation, and microprocessor core voltage applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LD49150PT12R 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 analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The LD49150 belongs to ST's high-performance LDO portfolio targeting low-voltage, high-current core regulation-specifically engineered for fast transient response and ultra-low-input-voltage operation in computing and graphics subsystems.
FAQ
Can LD49150PT12R operate with VIN = 1.25 V?
No. The absolute minimum VIN is 1.4 V per datasheet Section 5 (Maximum Ratings) and Section 6 (Electrical Characteristics). At 1.25 V, the device fails to regulate-output collapses regardless of load. For sub-1.4 V requirements, consider redesigning the power tree to raise VIN or selecting a different topology.
What happens if VBIAS is applied before VIN during power-up?
Applying VBIAS before VIN is the recommended sequencing per Section 8.6. It ensures internal circuitry is fully biased before the output stage activates, preventing output overvoltage spikes. Delaying VIN by ≥10 ms after VBIAS settling avoids instability and guarantees clean startup with <50 mV overshoot.
Is the thermal pad (GND pin) electrically isolated?
No. The exposed thermal pad is internally connected to the GND terminal (Pin 3 in PPAK), as confirmed in Table 2 (Pin Description) and Figure 5 (Pin connections). It must be soldered to a dedicated PCB ground plane with ≥4 thermal vias to meet θJA ≤ 100 °C/W and avoid thermal shutdown under 1.5 A load.
Does LD49150PT12R require an external resistor divider for 1.2 V output?
No. LD49150PT12R is the fixed-output variant-pin 2 (ADJ) is unused and not bonded out. The 1.2 V reference is trimmed internally; no external resistors are needed. Only adjustable versions (e.g., LD49150PT08R) require R1/R2 feedback networks per Section 8.9.
LD49150PT12R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 4 mA
- Current - Supply (Max):
- 6 mA
- PSRR:
- 68dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -25°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PPAK
LD49150PT12R FAQ
1.How can I place an order for LD49150PT12R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD49150PT12R 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 LD49150PT12R reliable?
The price and inventory of LD49150PT12R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD49150PT12R is usually 5 days.
3.What payment methods are accepted for LD49150PT12R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD49150PT12R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD49150PT12R?
LD49150PT12R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD49150PT12R 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 LD49150PT12R?
For technical support, including LD49150PT12R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD49150PT12R requirements.
6.How does Aetrix verify that LD49150PT12R is sourced from the original manufacturer or authorized distributors?
All LD49150PT12R 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 LD49150PT12R meets industry standards.
7.What is the process for return or replacement of LD49150PT12R?
All LD49150PT12R units undergo pre-shipment inspection (PSI). If there is an issue with LD49150PT12R, 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 LD49150PT12R part is unused and in its original packaging.
Return procedure for LD49150PT12R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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