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STMicroelectronics LD49300PT10R
- Part No.:
- LD49300PT10R
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LD49300PT10R.pdf
- Description:
- IC REG LINEAR 1V 3A PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,895
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Product details
Overview
LD49300PT10R from STMicroelectronics is a 3.0 A, very low-dropout linear voltage regulator with dual-supply architecture (VIN = 1.4–5.5 V, VBIAS = 3–6 V), ±1.5% output accuracy at 25 °C, 400 mV max dropout at 3 A, and 0.8 V adjustable/1.0 V fixed output. It powers microprocessor core voltages in PC add-in cards and graphics processors requiring fast transient response up to 10 MHz bandwidth.
For engineers reviewing the LD49300PT10R datasheet, LD49300PT10R pinout, LD49300PT10R application, or LD49300PT10R equivalent, key selection criteria include dual-rail input compatibility, ceramic-capacitor stability, logic-controlled shutdown, thermal/current protection, and PPAK package thermal performance for high-current linear regulation.
Technical Context
The LD49300 implements a dual-supply topology where VIN delivers output power while VBIAS independently powers internal control circuitry-enabling ultra-low VIN operation down to 1.4 V and reducing effective dropout. Its high-bandwidth error amplifier supports 10 MHz transient response, critical for CPU core supply dynamics.
It features an active-high EN pin with 0.4 V shutdown / 1.4 V enable thresholds, integrated thermal shutdown and current limiting (4.5 A), and operates across –25 °C to 125 °C junction temperature. Output voltage is fixed at 1.0 V for this variant (LD49300PT10R), with reference voltage of 0.8 V ±1.2% over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.0 A continuous - supports high-current digital IC core rails without derating at 125 °C junction. |
| Dropout Voltage | 400 mV at 3 A - enables regulation from 1.4 V input to 1.0 V output, minimizing power loss and heat generation. |
| Output Accuracy | ±1.5% at 25 °C - ensures tight core voltage compliance for modern low-voltage microprocessors. |
| Input Voltage Range | VIN: 1.4–5.5 V; VBIAS: 3–6 V - decouples power delivery and biasing, allowing independent sequencing and low-VIN operation. |
| Transient Bandwidth | Up to 10 MHz - suppresses load-induced voltage droop/surge during CPU burst activity (e.g., GPU shader clock transitions). |
| Protection Features | Thermal shutdown + current limit (4.5 A) - prevents damage during short-circuit or overload without external circuitry. |
| Capacitor Compatibility | Stable with ≥1 µF ceramic output capacitor - eliminates need for bulky electrolytics and reduces PCB footprint. |
Pinout & Package
LD49300PT10R uses the thermally enhanced PPAK (Power Package) package: 5-pin, exposed thermal pad soldered to PCB ground plane, dimensions 6.0 × 6.4 × 1.1 mm (max height), with 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable input | Active-high logic control: ≥1.4 V enables regulator; ≤0.4 V forces shutdown with 5 µA quiescent current. |
| 2 (VIN) | Main power input | Supplies output current path; accepts 1.4–5.5 V - enables direct regulation from low-voltage sources like SMPS outputs. |
| 3 (GND) | Ground reference & thermal tab | Common return for all circuits; exposed copper tab must be soldered to PCB ground plane for heatsinking. |
| 4 (VOUT) | Regulated output | Delivers fixed 1.0 V at up to 3.0 A; requires ≥1 µF ceramic capacitor placed adjacent to pin for stability. |
| 5 (VBIAS) | Bias supply input | Powers internal control circuitry only; draws 3–5 mA regardless of load - allows stable operation even when VIN is near VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply architecture | Separates power delivery (VIN) and control biasing (VBIAS), enabling 1.4 V minimum input and eliminating VBIAS current dependency on load. |
| Ultra-fast transient response | 10 MHz bandwidth maintains ±15 mV output deviation under 3 A step load (10–90% rise time < 1 µs), critical for CPU/GPU core supply. |
| Logic-controlled shutdown | EN pin reduces ground current to 5 µA in shutdown - ideal for system-level power gating in portable/embedded platforms. |
| Ceramic-capacitor stability | Stable with 1–10 µF X7R/X5R ceramics (ESR < 10 mΩ) - avoids tantalum/electrolytic cost, size, and reliability trade-offs. |
| Integrated protection | Thermal shutdown triggers at ~150 °C junction; current limit clamps at 4.5 A - eliminates need for external foldback or thermal sensors. |
Applications
| Graphics Processor Core Supply | PC Add-in Card Power |
|---|---|
Use Scenario: Delivering stable 1.0 V @ 2–3 A to GPU shader clusters during dynamic clock scaling and memory bandwidth bursts. IC Role / Device Role / Timing Role: Primary core voltage regulator with sub-µs transient recovery, directly replacing multi-phase buck converters in space-constrained designs. Use Value: Eliminates external MOSFET drivers and inductors while maintaining < ±20 mV output deviation under 2 A/µs load steps. | Use Scenario: Powering FPGA or ASIC cores on PCIe-based accelerator cards where board area and thermal density are constrained. IC Role / Device Role / Timing Role: Fixed-output LDO providing clean, low-noise 1.0 V rail synchronized with host system enable signals via EN pin. Use Value: Enables single-rail input design (VIN from 3.3 V SMPS) with VBIAS derived locally, simplifying power tree and reducing BOM count by 4+ components. |
| Microprocessor Core Voltage | High-Efficiency Linear Power Supply |
Use Scenario: Regulating core voltage for low-power ARM Cortex-A series SoCs in industrial gateways requiring deterministic startup timing. IC Role / Device Role / Timing Role: Main core LDO with precise power sequencing: VBIAS applied first, then EN/VIN, preventing output overvoltage spikes. Use Value: Achieves < 100 µs startup delay after EN assertion and sustains regulation during 100 ns VIN transients per Figure 21–22. | Use Scenario: Final-stage regulation in hybrid SMPS-LDO architectures where noise-sensitive analog subsystems require ultra-low ripple. IC Role / Device Role / Timing Role: Post-regulator suppressing switching noise from upstream DC-DC converters operating at 500 kHz–2 MHz. Use Value: Delivers < 20 µVRMS output noise (10 Hz–100 kHz) and >68 dB PSRR at 120 Hz - outperforming standard LDOs by 15–20 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, high-current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS7A8300RGRT | 3 A, 1.0 V fixed, 200 mV dropout at 3 A; requires only single input (no VBIAS); higher quiescent current (2.5 mA vs. 4–6 mA active). | Eliminates VBIAS rail but lacks dual-supply flexibility for ultra-low VIN use cases (< 2.0 V). | Select when board space prohibits dual-input routing and VIN ≥ 2.5 V; avoid when VIN may dip below 2.0 V. |
| Analog Devices ADM7172ACPZ-R7 | 3 A, 1.0 V fixed, 175 mV dropout at 3 A; single-supply; integrated soft-start; no enable pin. | No logic-controlled shutdown; soft-start limits inrush but adds 1.2 ms startup delay vs. LD49300's < 100 µs. | Select for noise-sensitive analog rails where soft-start prevents system reset; avoid when fast enable/disable cycling is required. |
Compared with TPS7A8300RGRT and ADM7172ACPZ-R7, LD49300PT10R uniquely supports 1.4 V minimum VIN via dual-supply architecture-critical for post-regulation from low-headroom SMPS-while offering faster transient response and integrated enable control, albeit with added VBIAS routing complexity.
Availability
LD49300PT10R is available at Aetrix Electronics and suitable for graphics processor core supplies, PC add-in card power systems, and microprocessor core voltage regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LD49300PT10R 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 microcontrollers, power management ICs, and analog/mixed-signal devices for industrial, automotive, and consumer markets.
The LD49300 belongs to ST's high-performance LDO family targeting high-current, low-noise core voltage regulation in computing and graphics applications-designed specifically for fast transient loads and ultra-low input voltage operation.
FAQ
What is the minimum input voltage required for LD49300PT10R to regulate 1.0 V output?
The minimum main input voltage (VIN) is 1.4 V, enabled by the dual-supply architecture: VBIAS powers the control circuitry independently, allowing VIN to operate as low as (VOUT + dropout) = 1.0 V + 0.4 V = 1.4 V. VBIAS must be ≥3 V and ≥2.1 V above VOUT, so 3.1 V minimum is required for 1.0 V output.
Can LD49300PT10R be used without the VBIAS supply?
No. VBIAS is mandatory: it powers the internal error amplifier, reference, and driver stages. Omitting VBIAS prevents regulation regardless of VIN level. The datasheet specifies VBIAS = 3–6 V, and operation is undefined outside this range-even if VIN is within spec.
What is the recommended output capacitor for optimal transient performance?
A 10 µF X7R ceramic capacitor placed within 2 mm of the VOUT and GND pins is recommended for best transient response. While 1 µF meets minimum stability requirements, 10 µF reduces peak deviation by ~40% under 3 A load steps and improves PSRR above 10 kHz, per Figures 24 and 17 in the datasheet.
How does the EN pin behave during power sequencing?
EN must be held low until VBIAS reaches ≥3.0 V and stabilizes; applying EN high before VBIAS settling causes uncontrolled output overshoot. Once VBIAS is stable, asserting EN high enables regulation within <100 µs. Pulling EN to VIN (not floating) ensures default-on operation if sequencing control is unavailable.
LD49300PT10R 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 3A
- Current - Output:
- 3A
- 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
LD49300PT10R FAQ
1.How can I place an order for LD49300PT10R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD49300PT10R 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 LD49300PT10R reliable?
The price and inventory of LD49300PT10R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD49300PT10R is usually 5 days.
3.What payment methods are accepted for LD49300PT10R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD49300PT10R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD49300PT10R?
LD49300PT10R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD49300PT10R 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 LD49300PT10R?
For technical support, including LD49300PT10R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD49300PT10R requirements.
6.How does Aetrix verify that LD49300PT10R is sourced from the original manufacturer or authorized distributors?
All LD49300PT10R 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 LD49300PT10R meets industry standards.
7.What is the process for return or replacement of LD49300PT10R?
All LD49300PT10R units undergo pre-shipment inspection (PSI). If there is an issue with LD49300PT10R, 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 LD49300PT10R part is unused and in its original packaging.
Return procedure for LD49300PT10R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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