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Texas Instruments LP3892ESX-1.2/NOPB
- Part No.:
- LP3892ESX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LP3892ESX-1.2/NOPB.pdf
- Description:
- IC REG LINEAR 1.2V 1.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:889
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Product details
Overview
LP3892ESX-1.2/NOPB from Texas Instruments is a 1.5A ultra-low-dropout linear regulator in DDPAK/TO-263-5 package, delivering 1.2V output with ±1.5% accuracy at 25°C, 140 mV typical dropout at full load, and 60 nA shutdown current - designed for post-regulation in DSP, microcontroller core, and server I/O power supplies.
For engineers reviewing the LP3892ESX-1.2/NOPB datasheet, LP3892ESX-1.2/NOPB pinout, LP3892ESX-1.2/NOPB application, or LP3892ESX-1.2/NOPB equivalent, key selection factors include bias rail dependency (4.5–6V VBIAS), N-MOS pass transistor architecture enabling fast transient response, thermal shutdown and overcurrent protection, and SO PowerPAD-8 / TO-220 / DDPAK package variants with distinct thermal resistance profiles.
Technical Context
The LP3892ESX-1.2/NOPB uses a CMOS-based N-MOS pass transistor architecture requiring dual-rail operation: VIN supplies load current while VBIAS (4.5–6V) drives the gate, enabling regulation down to ultra-low input-to-output differentials. Its bandwidth is optimized for fast transient response without demanding high-ESR output capacitors.
It integrates internal overtemperature and overcurrent protection, supports shutdown via S/D pin with 20 µs turn-off delay, and maintains stability with ≥10 µF tantalum output capacitance - avoiding ceramic-only solutions due to ESR sensitivity. Ground current remains low (3 mA typ at 1.5A) across load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.2 V ±1.5% at 25°C - ensures stable core voltage for low-power microcontrollers and DSPs |
| Max Output Current | 1.5 A - supports high-current digital loads without external current boosting |
| Dropout Voltage | 140 mV (typ) at 1.5A - enables operation with minimal headroom (e.g., 1.34V input for 1.2V output) |
| Quiescent Current | 60 nA (typ) in shutdown - critical for battery-backed or always-on standby circuits |
| VBIAS Range | 4.5 V to 6 V - mandates dedicated bias rail; not self-biased from VIN |
| Operating Temp | −40°C to +125°C junction - qualified for industrial and automotive under-hood environments |
| PSRR @ 1 kHz | 65 dB (VIN), 65 dB (VBIAS) - suppresses ripple from upstream SMPS or noisy bias sources |
Pinout & Package
LP3892ESX-1.2/NOPB is housed in a thermally enhanced DDPAK/TO-263-5 package (KTT drawing), featuring an exposed thermal pad soldered to PCB copper for efficient heat dissipation. θJA ≈ 40°C/W with ≥1.5 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Main power input | Supplies load current; must be ≥ (VOUT + VDO) and ≤5.5V |
| 2: GND | Analog ground reference | Common return for control circuitry and feedback path; separate from power ground in high-noise systems |
| 3: S/D | Shutdown control input | Active-low logic input; requires pull-up resistor (10–100 kΩ) if driven by open-drain source |
| 4: VBIAS | Bias supply input | Provides gate drive for N-MOS pass transistor; must be 4.5–6V independent of VIN |
| 5: VOUT | Regulated output | Delivers 1.2V to load; requires ≥10 µF low-ESR tantalum capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| N-MOS pass transistor | Enables wide bandwidth and fast transient response without complex compensation |
| Ultra-low dropout | 140 mV at 1.5A allows use in tight-voltage-margin systems (e.g., Li-ion battery-powered devices) |
| Dual-supply architecture | Separate VIN and VBIAS rails decouple power delivery from gate drive, improving PSRR and load step immunity |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or poor heatsinking |
| Low shutdown IQ | 60 nA enables multi-year battery life in maintenance-free IoT sensor nodes |
Applications
| Server Core and I/O Supplies | DSP Power Supplies |
|---|---|
Use Scenario: Regulating 1.2V core voltage for multi-core server processors with dynamic load steps up to 1.5A. IC Role / Device Role / Timing Role: Post-regulator after primary buck converter, providing clean, low-noise DC for sensitive digital cores. Use Value: 140 mV dropout minimizes power loss at high current; 65 dB PSRR at 1 kHz attenuates switching noise from upstream SMPS. | Use Scenario: Supplying 1.2V to fixed-point or floating-point DSPs in telecom baseband processing units. IC Role / Device Role / Timing Role: Local point-of-load regulator placed near DSP BGA package to reduce IR drop and noise coupling. Use Value: Fast transient response handles rapid current surges during FFT or filter computation bursts without output sag. |
| Microcontroller Power Supplies | SMPS Post-Regulators |
Use Scenario: Powering ARM Cortex-M7 or RISC-V SoCs in industrial PLCs operating from −40°C to +125°C ambient. IC Role / Device Role / Timing Role: Primary LDO for MCU core domain, with S/D pin controlled by system supervisor IC. Use Value: 60 nA shutdown current extends battery backup runtime; −40°C to +125°C rating ensures reliability in uncontrolled enclosures. | Use Scenario: Tight-tolerance final-stage regulation after 3.3V or 5V buck converter in medical imaging power trees. IC Role / Device Role / Timing Role: Precision post-regulator correcting residual ripple and load-induced drift from upstream converters. Use Value: 0.04%/A load regulation and 0.01%/V line regulation maintain <±10 mV output deviation across full load and input range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 200 mA max output, 15 µVRMS noise, no VBIAS requirement, adjustable output | Lower current capacity; suited for analog signal chain biasing, not high-current digital cores | Select when ultra-low noise and simplicity outweigh current demand |
| TPS74901KTTR | 1.5A output, single-supply (no VBIAS), 250 mV dropout at 1.5A, 12 µVRMS noise | Higher dropout limits use in low-headroom systems; lacks VBIAS flexibility for ultra-low VIN scenarios | Select when eliminating bias rail simplifies design and 250 mV dropout is acceptable |
Compared with LP3892ESX-1.2/NOPB, TPS7A4700RGWR trades current capability for precision analog performance, while TPS74901KTTR removes VBIAS complexity but sacrifices dropout margin - making LP3892ESX-1.2/NOPB optimal for high-current, ultra-low-VIN post-regulation where bias rail overhead is justified.
Availability
LP3892ESX-1.2/NOPB is available at Aetrix Electronics and suitable for server I/O supplies, DSP power domains, and industrial microcontroller applications requiring stable component supply, long-term lifecycle support, and RoHS-exempt packaging for high-reliability assembly.
Supply support for LP3892ESX-1.2/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power regulation and signal conditioning.
The LP3892 product line was engineered for high-current, fast-transient LDO applications in computing and communications infrastructure - emphasizing ultra-low dropout, dual-rail efficiency, and robust thermal behavior in TO-263 and PowerPAD packages.
FAQ
What is the minimum input voltage required for LP3892ESX-1.2/NOPB to regulate 1.2V output?
The LP3892ESX-1.2/NOPB requires VIN ≥ (VOUT + VDO). With 140 mV typical dropout at 1.5A, minimum VIN is 1.34V. However, recommended operating conditions specify VIN ≥ (VOUT + VDO) to 5.5V, and VBIAS must be maintained at 4.5–6V independently. Below 1.34V, regulation fails and output drops proportionally.
Does LP3892ESX-1.2/NOPB require an external bias supply, and why?
Yes, LP3892ESX-1.2/NOPB requires a dedicated 4.5–6V VBIAS supply to drive the gate of its N-MOS pass transistor. This architecture enables ultra-low dropout and high efficiency but separates gate drive from load current path - unlike P-MOS LDOs, which self-bias from VIN. Omitting VBIAS prevents regulation entirely.
Can ceramic capacitors be used for the output of LP3892ESX-1.2/NOPB?
No - ceramic capacitors alone are unsuitable for LP3892ESX-1.2/NOPB output due to their extremely low ESR (<10 mΩ), which destabilizes the control loop. The datasheet mandates ≥10 µF tantalum (recommended) or aluminum electrolytic (restricted temp range); ceramics may only supplement up to 15% of total tantalum capacitance.
What thermal considerations apply to LP3892ESX-1.2/NOPB in DDPAK/TO-263 package?
LP3892ESX-1.2/NOPB in DDPAK/TO-263 has θJA ≈ 40°C/W when soldered to ≥1.5 in² copper area. Power dissipation is PD = (VIN − VOUT) × IOUT + VIN × IGND. Junction temperature must stay ≤125°C; derating is required above 25°C ambient. Thermal vias under the exposed pad significantly improve heat transfer to inner layers.
How does the shutdown function operate on LP3892ESX-1.2/NOPB?
LP3892ESX-1.2/NOPB enters shutdown when the S/D pin voltage falls below 0.3V (typ), reducing quiescent current to 60 nA. The pin requires active pull-up (10–100 kΩ) to VBIAS or VIN if driven by open-drain logic. Turn-off delay is 20 µs; turn-on delay is 15 µs. Leaving S/D unconnected risks undefined operation.
LP3892ESX-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 0.50V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 30 µA
- Current - Supply (Max):
- 8 mA
- PSRR:
- 80dB ~ 65dB (120Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LP3892ESX-1.2/NOPB FAQ
1.How can I place an order for LP3892ESX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3892ESX-1.2/NOPB 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 LP3892ESX-1.2/NOPB reliable?
The price and inventory of LP3892ESX-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3892ESX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LP3892ESX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3892ESX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3892ESX-1.2/NOPB?
LP3892ESX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3892ESX-1.2/NOPB 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 LP3892ESX-1.2/NOPB?
For technical support, including LP3892ESX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3892ESX-1.2/NOPB requirements.
6.How does Aetrix verify that LP3892ESX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3892ESX-1.2/NOPB 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 LP3892ESX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LP3892ESX-1.2/NOPB?
All LP3892ESX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3892ESX-1.2/NOPB, 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 LP3892ESX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LP3892ESX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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