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Texas Instruments LP38502SDE-ADJ/NOPB
- Part No.:
- LP38502SDE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LP38502SDE-ADJ/NOPB.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:13,169
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Product details
Overview
LP38502SDE-ADJ/NOPB from Texas Instruments is an adjustable 1.5-A ultra-low-dropout linear regulator with PMOS pass transistor, operating from 2.7 V to 5.5 V input and delivering 0.6 V to 5 V output. It features FlexCap compensation (stable with ceramic/tantalum/aluminum capacitors), 25-nA shutdown current, and integrated enable pin for power sequencing in FPGA/ASIC core supplies.
For engineers reviewing the LP38502SDE-ADJ/NOPB datasheet, LP38502SDE-ADJ/NOPB pinout, LP38502SDE-ADJ/NOPB application, or LP38502SDE-ADJ/NOPB equivalent, key selection criteria include dropout voltage at 1.5 A, adjust-pin accuracy (±1.5% for A-grade), thermal performance in WSON-8, EN pin logic thresholds, and load transient response under 0.5 A/µs slew rate.
Technical Context
The LP38502SDE-ADJ/NOPB uses internal feed-forward architecture to accelerate load transient response-peak deviation is only 40 mV during 0.1 A → 1.5 A step at 0.5 A/µs. Its unique compensation eliminates ESR dependency, enabling stable operation with any capacitor type including low-ESR ceramics down to a few mΩ.
It integrates overtemperature shutdown (170°C, 10°C hysteresis) and current limiting (3.6 A peak, 3.7 A short-circuit), with disable mode reducing ground current to 25 nA. The EN pin requires active drive or pull-up to VIN; floating is prohibited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5 A DC - ensures full-core power delivery for mid-tier FPGAs and ASICs without derating at TJ ≤ 125°C |
| Dropout Voltage | 275 mV at 1.5 A - enables high-efficiency regulation from 3.3-V rail to 1.8-V core supply |
| Adjust Pin Voltage | 0.605 V (typ), ±1.5% (A grade at 25°C) - sets precise output via external resistor divider with minimal error propagation |
| PSRR | 56 dB at 1 kHz - suppresses switching noise from upstream SMPS in hybrid power architectures |
| Output Noise | 100 µVrms (100 Hz–100 kHz) - meets low-noise analog/RF subsystem requirements without additional filtering |
| Enable Threshold | VIL(EN) = 0.65 V, VIH(EN) = 1.4 V - compatible with 1.8-V/3.3-V GPIO control without level-shifting |
| Thermal Resistance | RθJA = 52.5°C/W (WSON-8 with thermal vias) - defines PCB copper area requirement for 1.5-A continuous operation at TA = 70°C |
Pinout & Package
LP38502SDE-ADJ/NOPB uses an 8-pin WSON package (3.00 mm × 2.50 mm, 0.5-mm pitch) with exposed thermal pad (DAP) requiring solder connection to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 3,4) | Input supply | Two parallel input pins share current; must be connected together on PCB to minimize impedance and ensure current sharing |
| OUT (Pins 5,6,7) | Regulated output | Three parallel output pins reduce IR drop and improve current handling; require common trace routing |
| ADJ (Pin 8) | Feedback reference | Sets output voltage via resistor divider; bias current ≤ 750 nA minimizes divider error |
| EN (Pin 2) | Enable control | Active-high logic input; must be pulled to VIN or driven-floating causes undefined output state |
| GND (Pin 1) | Ground reference | Primary ground return; DAP provides supplemental thermal path but cannot replace this pin for electrical grounding |
| N/C (Pin ?) | No connect | No internal connection; may be used for signal routing or left unconnected |
Key Features
| Feature | Design Value |
|---|---|
| FlexCap compensation | Stable with ceramic, tantalum, or aluminum capacitors-no ESR minimum/maximum constraints simplifies BOM and layout |
| Fast load transient response | 40-mV peak deviation during 0.1 A → 1.5 A step enables reliable powering of burst-mode digital loads |
| Ultra-low shutdown current | 25 nA quiescent current in disable mode extends battery life in always-on system monitoring circuits |
| Integrated protection | Thermal shutdown (170°C, 10°C hysteresis) and current limiting prevent damage during overload or short-circuit events |
| Adjustable precision output | ±1.5% VADJ tolerance (A grade) supports tight core voltage margins for modern low-voltage processors |
Applications
| ASIC Core Power Supply | DSP I/O Voltage Regulation |
|---|---|
|
Use Scenario: Powers 1.2-V core of graphics controller ASIC in printer engine board with dynamic load ranging 10 mA–1.5 A. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise core voltage; enables fast wake-up from deep-sleep states. Use Value: 275-mV dropout preserves headroom from 3.3-V rail; 40-mV transient excursion avoids logic errors during burst rendering. |
Use Scenario: Supplies 3.3-V I/O bank of audio DSP in DVD player, co-located with SMPS-derived 5-V rail. IC Role / Device Role / Timing Role: Post-regulator rejecting switching ripple from upstream converter; maintains signal integrity during analog-to-digital conversion. Use Value: 56-dB PSRR at 1 kHz attenuates SMPS noise; 100-µVrms output noise prevents audible artifacts in DAC output. |
| FPGA Configuration Voltage | Set-Top Box Memory Interface |
|
Use Scenario: Provides 1.8-V configuration voltage to Spartan-7 FPGA during boot, then remains active during runtime. IC Role / Device Role / Timing Role: Always-on LDO with EN pin controlled by system supervisor IC for sequenced power-up. Use Value: 25-nA shutdown current minimizes standby drain; EN logic thresholds match 3.3-V microcontroller GPIO. |
Use Scenario: Regulates 1.5-V DDR3 interface voltage in cable set-top box, subjected to rapid current steps during video frame buffering. IC Role / Device Role / Timing Role: High-current, low-noise local regulator placed near memory module to reduce PDN impedance. Use Value: Three parallel OUT pins lower trace resistance; WSON-8 footprint enables compact placement adjacent to BGA memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 200-mA sink driver (not LDO); no adjustable output, no EN pin, different function | Designed for LED/relay driving-not suitable for voltage regulation | Select only if application requires constant-current sinking, not regulated voltage supply |
| TPS7A4701RGWR | 1-A LDO with 4-µVrms noise, ±0.5% accuracy, but higher 300-mV dropout at 1 A and no FlexCap support | Better noise/accuracy for RF/analog; less tolerant of capacitor ESR variation and higher dropout limits low-VIN use | Choose for ultra-low-noise analog rails where capacitor flexibility is secondary and 1-A current suffices |
Compared with LP38502SDE-ADJ/NOPB, TPS7A4701RGWR offers superior noise and accuracy but lacks FlexCap stability and delivers only 1 A; TPL7407LPGEDR is functionally unrelated and unsuitable as a voltage regulator replacement.
Availability
LP38502SDE-ADJ/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O regulation, ASIC power domains, and set-top box memory interfaces requiring stable component supply across industrial temperature ranges and multi-year production cycles.
Supply support for LP38502SDE-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 analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The LP38502SDE-ADJ/NOPB belongs to TI's FlexCap LDO family, engineered specifically for high-current, low-noise, capacitor-flexible power delivery in space-constrained digital systems with dynamic load profiles.
FAQ
What is the maximum output current capability of the LP38502SDE-ADJ/NOPB?
The LP38502SDE-ADJ/NOPB is specified for 1.5 A DC output current under recommended operating conditions (TJ ≤ 125°C). Peak output current reaches 3.6 A before current limiting activates, and short-circuit current is 3.7 A at 25°C. Thermal performance in the WSON-8 package must be verified for sustained 1.5-A operation at elevated ambient temperatures using RθJA = 52.5°C/W and appropriate PCB copper area.
Does the LP38502SDE-ADJ/NOPB require a minimum ESR on the output capacitor?
No, the LP38502SDE-ADJ/NOPB does not require minimum or maximum ESR on the output capacitor due to its FlexCap internal compensation. It remains stable with ceramic (X5R/X7R), tantalum, or aluminum electrolytic capacitors-including ultra-low-ESR ceramics down to a few milliohms. This eliminates ESR-related design constraints and simplifies capacitor selection for noise and transient performance.
How is the output voltage set on the LP38502SDE-ADJ/NOPB?
The output voltage of the LP38502SDE-ADJ/NOPB is set externally using two resistors (R1 and R2) connected to the ADJ pin per the formula: VOUT = VADJ(1 + R1/R2) + IADJ·R1, where VADJ = 0.605 V (typ) and IADJ ≤ 750 nA. R2 must be ≤ 10 kΩ for optimal loop compensation. For example, setting 1.8 V requires R2 = 10 kΩ and R1 ≈ 19.8 kΩ.
What is the purpose of the EN pin on the LP38502SDE-ADJ/NOPB?
The EN pin on the LP38502SDE-ADJ/NOPB enables external control of regulator output: pulling EN ≥ 1.4 V turns the output on, while pulling EN ≤ 0.65 V disables it, reducing ground current to 25 nA. The pin has no internal bias and must be actively driven or pulled up to VIN with a 10-kΩ resistor-leaving it floating results in undefined behavior and potential malfunction of the LP38502SDE-ADJ/NOPB.
Can the LP38502SDE-ADJ/NOPB be used with a 2.5-V input to generate 1.8-V output?
Yes, the LP38502SDE-ADJ/NOPB supports input voltages from 2.7 V to 5.5 V, so a 2.5-V input falls below the minimum operating range and is not permitted. At 1.8-V output and 1.5-A load, the minimum required input is VOUT + VDO = 1.8 V + 0.275 V = 2.075 V-but the absolute minimum input rating is 2.7 V per datasheet specifications. Using 2.5 V violates recommended operating conditions and risks regulation loss or instability of the LP38502SDE-ADJ/NOPB.
LP38502SDE-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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):
- 0.6V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.37 @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 15 µA
- Current - Supply (Max):
- 4 mA
- PSRR:
- 58dB ~ 56dB (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:
- 8-WSON (3x2.5)
LP38502SDE-ADJ/NOPB FAQ
1.How can I place an order for LP38502SDE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38502SDE-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 LP38502SDE-ADJ/NOPB reliable?
The price and inventory of LP38502SDE-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 LP38502SDE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38502SDE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38502SDE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38502SDE-ADJ/NOPB?
LP38502SDE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38502SDE-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 LP38502SDE-ADJ/NOPB?
For technical support, including LP38502SDE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38502SDE-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38502SDE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38502SDE-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 LP38502SDE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38502SDE-ADJ/NOPB?
All LP38502SDE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38502SDE-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 LP38502SDE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38502SDE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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