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Texas Instruments LP38852MRX-ADJ/NOPB
- Part No.:
- LP38852MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP38852MRX-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,996
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Product details
Overview
LP38852MRX-ADJ/NOPB from Texas Instruments is a 1.5-A adjustable low-dropout linear regulator with dual-rail operation (VIN and VBIAS), 130-mV typical dropout at full load, ±1.5% output voltage accuracy at 25°C, and integrated soft-start and enable functions. It powers microcontroller cores and DSPs in server I/O and graphics card power supplies.
For engineers reviewing the LP38852MRX-ADJ/NOPB datasheet, LP38852MRX-ADJ/NOPB pinout, LP38852MRX-ADJ/NOPB application, or LP38852MRX-ADJ/NOPB equivalent, key selection considerations include its dual-supply architecture (VIN for power path, VBIAS for control bias), 0.8–1.8-V adjustable output range, 7-pin DDPAK/TO-263 package thermal performance, and soft-start capacitor programmability.
Technical Context
The LP38852MRX-ADJ/NOPB uses an N-MOS pass transistor driven by a separate VBIAS rail (3–5.5 V), enabling stable regulation down to VIN = VOUT + 130 mV. Its CMOS-based control circuitry draws only 7–9 mA quiescent current from VIN and 3–4.5 mA from VBIAS at 1.5-A load.
It features undervoltage lockout (UVLO) with ~2.45-V threshold and 150-mV hysteresis, thermal shutdown at 160°C, and reverse-voltage protection via gate-driven isolation-no body diode conduction when EN or VBIAS is inactive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.8 V to 1.8 V, set externally via resistor divider on ADJ pin |
| Dropout Voltage | 130 mV (typical) at 1.5-A load - enables ultra-low VIN operation |
| Output Accuracy | ±1.5% at TJ = 25°C; ±2% over 0°C to +125°C - supports tight-core-voltage tolerance |
| VBIAS Range | 3 V to 5.5 V - separates control bias from power path for efficiency |
| Soft-Start Time | 675 µs (with CSS = 10 nF) - limits inrush current into COUT during turn-on |
| PSRR (VIN) | 80 dB at 120 Hz - suppresses input ripple in post-regulator applications |
| Thermal Resistance | RθJA = 34.3°C/W (DDPAK/TO-263) - enables 1.5-A continuous operation without forced air |
Pinout & Package
LP38852MRX-ADJ/NOPB is packaged in a 7-pin DDPAK/TO-263 (KTW) with exposed thermal pad (TAB). The TAB is electrically connected to GND and serves as primary thermal interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS | Soft-start timing node | Internal 13.5-kΩ resistor charges external CSS; controls VOUT ramp rate |
| EN | Enable control input | Active-high logic; 1.25-V threshold with 100-mV hysteresis; internal 180-kΩ pullup to VBIAS |
| ADJ | Feedback reference node | Connects to resistor divider; regulates VOUT = 0.6 V × (1 + R1/R2) |
| BIAS | Bias supply input | Powers internal reference, error amplifier, and gate driver - independent of VIN |
| IN | Main power input | High-current path to N-MOS source; must be ≥ VOUT + VDO and ≤ VBIAS |
| OUT | Regulated output | Delivers up to 1.5 A; requires ≥10-µF ceramic output capacitance for stability |
| GND | Power ground | Common return for IN, OUT, and BIAS supplies; connects to TAB for thermal conduction |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail architecture | VIN handles high-current load path; VBIAS powers low-noise control circuitry - decouples power integrity from bias stability |
| Ultra-low dropout | 130-mV typical at 1.5-A load - supports sub-1-V core rails with minimal headroom |
| Programmable soft-start | RC-controlled rise time via external CSS - prevents system-level brownouts during power-up |
| Stable with ceramic capacitors | Guaranteed stability with ≥10-µF X7R/X5R ceramic COUT - eliminates need for tantalum or electrolytic |
| Reverse-voltage protection | No body-diode conduction path - blocks reverse current when OUT > IN and EN/VBIAS inactive |
Applications
| ASIC Power Supplies | Server Core & I/O Supplies |
|---|---|
Use Scenario: Powers GPU voltage rails and CPU I/O buffers in desktop and notebook platforms where space and thermal density are constrained. IC Role / Device Role / Timing Role: Primary core LDO delivering 0.8–1.2 V at up to 1.5 A with fast transient response to handle burst-mode loads. Use Value: Dual-rail architecture maintains regulation even when VIN sags below 1.0 V, preserving system uptime during dynamic load steps. | Use Scenario: Supplies memory controller and PCIe switch I/O rails in 1U servers requiring high reliability and low noise. IC Role / Device Role / Timing Role: Post-regulator following a buck converter, cleaning residual switching noise before delivery to sensitive digital interfaces. Use Value: 80-dB PSRR at 120 Hz reduces ripple-induced jitter in high-speed SerDes links, improving bit-error-rate performance. |
| DSP/FPGA Core Supplies | SMPS Post-Regulator |
Use Scenario: Provides clean, adjustable core voltage to FPGA fabric or DSP processing units in industrial vision systems and telecom baseband cards. IC Role / Device Role / Timing Role: Adjustable LDO with soft-start ensuring controlled power-up sequencing across multiple voltage domains. Use Value: ±1.5% output accuracy at 25°C and ±2% over full temperature range meets FPGA core voltage tolerance specs without trimming. | Use Scenario: Final-stage regulation after a high-efficiency DC/DC converter in gaming consoles and set-top boxes. IC Role / Device Role / Timing Role: Low-noise linear regulator suppressing switching artifacts from upstream SMPS to meet EMI compliance. Use Value: 150-µVRMS output noise (10 Hz–100 kHz) prevents analog subsystem interference and audio codec distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | 1.5-A, 50-µVRMS noise, 200-mV dropout, single-rail (VIN-only), 20-pin QFN | Lacks VBIAS rail; higher dropout limits ultra-low VIN use cases | Prefer when board space allows larger QFN and system has no ultralow VIN requirement |
| LP3985IMFX-1.8/NOPB | 150-mA max, fixed 1.8-V output, 150-mV dropout, SOT-23-5 | Lower current, fixed output, smaller package - not scalable to 1.5-A or adjustable needs | Select only for low-power auxiliary rails where footprint and cost outweigh performance needs |
Compared with TPS7A8300RGRT and LP3985IMFX-1.8/NOPB, LP38852MRX-ADJ/NOPB uniquely supports ultralow VIN operation via dedicated VBIAS, delivers full 1.5-A current in compact DDPAK, and enables precise core voltage tuning - making it optimal for high-density, multi-rail embedded systems.
Availability
LP38852MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for server I/O supplies, graphics card ASIC power, and DSP core regulation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LP38852MRX-ADJ/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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.
The LP38852MRX-ADJ/NOPB belongs to TI's high-performance LDO family targeting high-current, low-noise, and fast-transient applications in computing infrastructure and digital signal processing systems.
FAQ
What is the minimum input voltage required for LP38852MRX-ADJ/NOPB to regulate a 0.8-V output?
The LP38852MRX-ADJ/NOPB requires VIN ≥ VOUT + VDO. With a typical dropout of 130 mV at 1.5-A load, the minimum functional VIN is 0.93 V. However, the absolute minimum recommended VIN per datasheet is 0.93 V under specified conditions - below this, regulation cannot be guaranteed. Always verify against actual load and thermal conditions in final design.
Can LP38852MRX-ADJ/NOPB operate with VBIAS = 3.3 V while delivering 1.5 A at VOUT = 1.2 V?
Yes. The LP38852MRX-ADJ/NOPB supports VBIAS from 3 V to 5.5 V for VOUT ≤ 1.2 V. At VBIAS = 3.3 V and VOUT = 1.2 V, the device operates within its recommended conditions, maintaining ±2% output accuracy across –40°C to +125°C junction temperature. No derating is required for this configuration.
How does the SS pin function in LP38852MRX-ADJ/NOPB, and what capacitor value sets a 2-ms soft-start time?
The SS pin in LP38852MRX-ADJ/NOPB connects internally to a 13.5-kΩ resistor that charges an external capacitor (CSS) to control VOUT ramp rate. Using tSS = CSS × rSS × 5, a 2-ms soft-start requires CSS ≈ 29.6 nF (2000 µs ÷ (13.5 kΩ × 5)). A standard 33-nF ceramic capacitor achieves ~2.25 ms, well within practical design margins.
Is LP38852MRX-ADJ/NOPB compatible with 10-µF ceramic output capacitors, and why is this significant?
Yes - LP38852MRX-ADJ/NOPB is explicitly characterized and guaranteed stable with ≥10-µF X7R/X5R ceramic capacitors. This eliminates reliance on higher-ESR tantalum or aluminum electrolytics, reducing board area, improving reliability, and lowering ESR-related output impedance - critical for handling fast load transients in DSP and FPGA applications.
Does LP38852MRX-ADJ/NOPB provide reverse-current protection, and how is it implemented?
Yes. LP38852MRX-ADJ/NOPB blocks reverse current (OUT → IN) when EN is low or VBIAS falls below UVLO (~2.45 V), because its N-MOS pass transistor lacks a parasitic body diode and its gate drive is disabled. This prevents backfeeding into upstream supplies - a key safety feature in multi-rail systems with asynchronous power sequencing.
LP38852MRX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 1.8V
- Voltage Dropout (Max):
- 0.18V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 9 mA
- PSRR:
- 80dB ~ 65dB (120Hz ~ 1kHz)
- Control Features:
- Enable, Soft Start
- Protection Features:
- Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LP38852MRX-ADJ/NOPB FAQ
1.How can I place an order for LP38852MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38852MRX-ADJ/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 LP38852MRX-ADJ/NOPB reliable?
The price and inventory of LP38852MRX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38852MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38852MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38852MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38852MRX-ADJ/NOPB?
LP38852MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38852MRX-ADJ/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 LP38852MRX-ADJ/NOPB?
For technical support, including LP38852MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38852MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38852MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38852MRX-ADJ/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 LP38852MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38852MRX-ADJ/NOPB?
All LP38852MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38852MRX-ADJ/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 LP38852MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38852MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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