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Texas Instruments LP38852MR-ADJ/NOPB
- Part No.:
- LP38852MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP38852MR-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
LP38852MR-ADJ/NOPB from Texas Instruments is a 1.5-A fast-response adjustable LDO linear regulator with dual-input architecture (VIN for power path, VBIAS for control circuitry), 130 mV typical dropout at full load, ±2% output voltage accuracy over –40°C to +125°C, and integrated soft-start and enable functionality - used in DSP core supplies, FPGA I/O rails, and SMPS post-regulation.
For engineers reviewing the LP38852MR-ADJ/NOPB datasheet, LP38852MR-ADJ/NOPB pinout, LP38852MR-ADJ/NOPB application, or LP38852MR-ADJ/NOPB equivalent, key selection criteria include ultra-low VIN capability via separate VBIAS rail, stability with 10-µF ceramic output capacitors, programmable soft-start timing, thermal/overcurrent protection, and SO PowerPAD™ package thermal performance.
Technical Context
The LP38852MR-ADJ/NOPB employs an N-MOS pass transistor driven by a dedicated VBIAS rail (3–5.5 V), enabling regulation from VIN as low as 0.93 V while maintaining high PSRR (80 dB at 120 Hz on VIN, 58 dB on VBIAS) and low output noise (150 µVRMS, 10 Hz–100 kHz). Its CMOS architecture delivers 7–9 mA quiescent current across 10 mA–1.5 A load range.
Functional modes include undervoltage lockout (UVLO threshold ≈2.45 V, 150 mV hysteresis), enable-controlled operation (VEN(ON) = 1.25 V typ., 100 mV hysteresis), and soft-start governed by external CSS capacitor (tSS = CSS × rSS × 5, rSS = 13.5 kΩ typ.). Reverse-voltage protection is inherent due to absence of body diode in the N-MOS pass element.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A maximum - supports high-current digital loads including microcontroller cores and FPGA I/O banks. |
| Dropout Voltage | 130 mV typical at 1.5 A - enables operation with minimal VIN–VOUT margin, critical for low-voltage systems. |
| Output Accuracy | ±2% over –40°C to +125°C - ensures stable voltage under industrial temperature extremes without recalibration. |
| Input Voltage Range | VIN: 0.93 V to 5.5 V; VBIAS: 3 V to 5.5 V - decoupled rails allow ultralow VIN while preserving control circuit integrity. |
| Stability | Stable with ≥10-µF ceramic COUT - eliminates need for bulky tantalum or electrolytic capacitors, reducing board area and cost. |
| Thermal Protection | Thermal shutdown at 160°C with 10°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Soft-Start Time | Programmable via CSS (e.g., 675 µs with 10 nF) - limits inrush current into large output capacitance, avoiding supply rail collapse. |
Pinout & Package
LP38852MR-ADJ/NOPB is packaged in an 8-pin SO PowerPAD™ (DDA) with exposed thermal pad (DAP) for enhanced heat dissipation. The DAP is electrically isolated and serves thermal-only function. Package dimensions: 4.89 mm × 3.90 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power input | High-current unregulated input (VIN); must be ≥ VOUT + VDO and ≤ VBIAS (or ≤4.5 V if VBIAS > 4.5 V). |
| BIAS | Bias supply | Low-current control rail (VBIAS); powers internal reference, error amplifier, and gate driver; sets operating range (3–5.5 V). |
| GND | Ground reference | Analog ground for feedback and control circuits; requires low-impedance connection to minimize noise coupling. |
| OUT | Regulated output | Delivers up to 1.5 A at user-adjustable VOUT (0.8–1.8 V); connects directly to load and COUT. |
| ADJ | Feedback node | Connects to resistor divider (R1/R2) setting VOUT; internal VADJ = 500 mV ±2% at TJ = 25°C. |
| EN | Enable control | Digital input (active-high); 1.25 V threshold enables output; internal 180-kΩ pullup to VBIAS allows direct tie-off if unused. |
| SS | Soft-start timing | Connects to external CSS capacitor; controls VOUT ramp rate; internal rSS = 13.5 kΩ defines tSS = CSS × rSS × 5. |
| N/C | No connection | Pin 8 is internally unconnected; must remain floating or grounded per layout best practices - no signal routing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail input architecture | Separate VIN (power path) and VBIAS (control path) enables operation down to 0.93 V VIN while ensuring stable regulation. |
| Ultra-low dropout | 130 mV typical at 1.5 A - minimizes power loss and heat generation in high-current, low-VIN applications. |
| Fast transient response | Stable with 10-µF ceramic output caps and exhibits rapid recovery from load steps - critical for DSP/FPGA dynamic loads. |
| Integrated protection | Overtemperature shutdown (160°C), overcurrent limiting (~4.5 A short-circuit), and UVLO prevent fault propagation. |
| Programmable soft-start | External CSS capacitor sets controlled VOUT ramp time - eliminates inrush current spikes and avoids brownout on shared rails. |
Applications
| ASIC Core Supply | Server I/O Rail |
|---|---|
|
Use Scenario: Powering 0.8–1.2 V core logic in high-performance ASICs within desktop/notebook GPUs and server CPUs. IC Role / Device Role / Timing Role: Primary low-noise, high-accuracy core voltage regulator with fast line/load transient response. Use Value: Maintains ±2% VOUT accuracy across –40°C to +125°C junction temperature, preventing timing violations during thermal cycling. |
Use Scenario: Delivering stable 1.5–1.8 V I/O supply to memory interfaces and PCIe controllers in enterprise servers. IC Role / Device Role / Timing Role: Post-regulator following a switching converter, cleaning residual ripple and noise. Use Value: 80 dB PSRR at 120 Hz suppresses SMPS switching noise, ensuring signal integrity on high-speed serial links. |
| FPGA Configuration Rail | DSP Processing Core |
|
Use Scenario: Supplying configurable 1.2 V or 1.5 V I/O banks in Xilinx/Intel FPGAs used in industrial vision and communications equipment. IC Role / Device Role / Timing Role: Adjustable LDO with precise feedback (500 mV reference) and low output noise. Use Value: 150 µVRMS broadband noise avoids jitter accumulation in high-speed transceivers and ADC clock domains. |
Use Scenario: Providing 1.0–1.2 V core voltage to TI C6000 or Analog Devices SHARC DSPs in real-time audio and radar processing. IC Role / Device Role / Timing Role: Fast-response linear regulator with soft-start to manage burst-mode current draw. Use Value: Programmable tSS prevents supply droop during DSP wake-up, eliminating boot failures in low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | 1.5-A, 50 µV RMS noise, 75 µV/√Hz, 200 mV dropout at 1.5 A, single-rail input (2.2–6.5 V) | Lacks separate VBIAS rail; cannot operate below 2.2 V VIN; superior noise performance but higher dropout | Preferred where lowest noise is critical and VIN ≥2.2 V; not suitable for sub-1 V systems requiring ultra-low dropout. |
| LT3045EDD#PBF | 500 mA, 0.8 µV RMS noise, 0.8 µV/√Hz, 200 mV dropout at 500 mA, precision current-source reference | Lower current rating; uses current-based feedback for ultra-high PSRR (76 dB @ 1 MHz); no soft-start pin | Best for ultra-low-noise analog/RF biasing at ≤500 mA; unsuitable for 1.5-A digital loads or programmable soft-start requirements. |
Compared with TPS7A8300RGRT and LT3045EDD#PBF, LP38852MR-ADJ/NOPB uniquely supports ultralow VIN (0.93 V) via dual-rail architecture and delivers 1.5-A output with programmable soft-start - making it the only option among the three for high-current, low-voltage, thermally constrained digital core supplies.
Availability
LP38852MR-ADJ/NOPB is available at Aetrix Electronics and suitable for ASIC power supplies, server I/O rails, and DSP/FPGA core regulation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LP38852MR-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 ICs, embedded processors, and high-reliability components for industrial, automotive, and communications markets.
LP38852MR-ADJ/NOPB belongs to TI's high-performance LDO family targeting power-sensitive digital systems - engineered specifically for fast transient response, ultralow dropout, and dual-supply flexibility in advanced computing and infrastructure applications.
FAQ
What is the minimum input voltage (VIN) required for LP38852MR-ADJ/NOPB to regulate at 1.0 V output?
The LP38852MR-ADJ/NOPB requires VIN ≥ VOUT + VDO. With VOUT = 1.0 V and typical dropout (VDO) = 130 mV, minimum VIN is 1.13 V. However, the device supports VIN as low as 0.93 V when VOUT is set lower (e.g., 0.8 V), per its specified input range. Always verify against actual load and temperature conditions using the dropout vs. IOUT curve in the datasheet.
Can LP38852MR-ADJ/NOPB operate without an external VBIAS supply?
No. LP38852MR-ADJ/NOPB requires a valid VBIAS supply (3–5.5 V) to power its internal reference, error amplifier, and gate driver. Without VBIAS above the UVLO threshold (~2.45 V), the device remains disabled regardless of VIN or EN state. VBIAS is mandatory - it is not optional or bypassable.
How do I calculate the output voltage for LP38852MR-ADJ/NOPB using the ADJ pin?
LP38852MR-ADJ/NOPB uses a resistive divider (R1, R2) between OUT, ADJ, and GND. Output voltage is calculated as VOUT = VADJ × (1 + R1/R2), where VADJ = 500 mV (typical). For example, R1 = 1.0 kΩ and R2 = 1.0 kΩ yields VOUT = 1.0 V. Use tight-tolerance (±1%) resistors and keep parallel resistance ≤10 kΩ to avoid stability issues.
What is the purpose of the SS pin on LP38852MR-ADJ/NOPB, and how is it configured?
The SS pin on LP38852MR-ADJ/NOPB controls soft-start timing by charging an external capacitor (CSS). Soft-start time is tSS = CSS × rSS × 5, where rSS = 13.5 kΩ (typical). A 10 nF CSS yields ~675 µs ramp time. CSS must connect directly to clean GND; no other components may share this node. Leaving SS open disables soft-start but is not recommended for high-COUT designs.
Does LP38852MR-ADJ/NOPB require output capacitance, and what type is recommended?
Yes. LP38852MR-ADJ/NOPB requires ≥10 µF ceramic output capacitance (X5R/X7R) placed close to the OUT and GND pins for stability. The device is optimized for ceramic dielectrics - tantalum or aluminum electrolytics are not recommended due to ESR and aging effects. COUT must be rated for ≥1.5× VOUT and located within 5 mm of the package.
LP38852MR-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LP38852MR-ADJ/NOPB FAQ
1.How can I place an order for LP38852MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38852MR-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 LP38852MR-ADJ/NOPB reliable?
The price and inventory of LP38852MR-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 LP38852MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38852MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38852MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38852MR-ADJ/NOPB?
LP38852MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38852MR-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 LP38852MR-ADJ/NOPB?
For technical support, including LP38852MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38852MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38852MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38852MR-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 LP38852MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38852MR-ADJ/NOPB?
All LP38852MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38852MR-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 LP38852MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38852MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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