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Texas Instruments LP8340ILDX-ADJ/NOPB
- Part No.:
- LP8340ILDX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP8340ILDX-ADJ/NOPB.pdf
- Description:
- IC REG LINEAR POS ADJ 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
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Product details
Overview
LP8340ILDX-ADJ/NOPB from Texas Instruments is a low-dropout CMOS linear regulator with adjustable output (1.25V to 10V), 1.0A output current capability, ±1.5% typical VOUT tolerance, 420mV typical dropout at 1.0A (VOUT = 3.3V), and 19µA typical quiescent current. It serves as a precision voltage regulation stage in power rails for portable instrumentation and battery-powered systems requiring stable low-IQ operation.
For engineers reviewing the LP8340ILDX-ADJ/NOPB datasheet, LP8340ILDX-ADJ/NOPB pinout, LP8340ILDX-ADJ/NOPB application, or LP8340ILDX-ADJ/NOPB equivalent, this page delivers verified electrical parameters, thermal behavior, WSON-6 package layout, design-critical capacitor requirements, and validated alternative options for low-noise, high-efficiency linear regulation in space-constrained industrial and portable designs.
Technical Context
The LP8340ILDX-ADJ/NOPB implements a PMOS pass transistor architecture with zener-trimmed bandgap reference and error amplifier feedback control, enabling ultra-low ground current (<50µA) independent of load. Its foldback current limiting and thermal shutdown (160°C) provide robust fault protection without external components.
Unlike PNP-based LDOs, the PMOS topology eliminates base drive current, ensuring quiescent current remains stable across input voltage (2.7V–10V), temperature (−40°C to 125°C), and load (100µA–1.0A). The ADJ pin accepts external resistor dividers to set output voltage per VOUT = 1.25V × (1 + R1/R2), with ADJ leakage <±100nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.0A maximum - supports full-power operation of microcontrollers, ADCs, and RF front-ends without derating. |
| Dropout Voltage | 420mV @ 1.0A (VOUT = 3.3V) - enables regulation from 3.73V input, critical for single-cell Li-ion systems. |
| Quiescent Current | 19µA typical - extends battery life in always-on sensor nodes and standby power domains. |
| Output Voltage Accuracy | ±1.5% typical over temperature - ensures reliable logic-level compliance for 1.8V/2.5V/3.3V I/O domains. |
| Ripple Rejection | 48dB @ 120Hz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry. |
| Thermal Shutdown | 160°C with 10°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Input Voltage Range | 2.7V to 10V - accommodates wide-input industrial supplies and multi-cell battery stacks. |
Pinout & Package
LP8340ILDX-ADJ/NOPB is housed in a thermally enhanced 6-pin WSON package (NGD0006A), 2.0mm × 2.0mm × 0.75mm, with exposed thermal pad (GND-connected) for improved power dissipation. Pin 1 identification is marked by a dot; heatsink connection is via GND pin (Pin 2) and thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1 & 6) | Input supply connection | Must be externally shorted for full 1.0A operation (500mA max per pin); decoupling requires ≥1µF ceramic near each pin. |
| GND (Pin 2) | Power and signal reference | Primary ground return; connects to exposed thermal pad - essential for thermal performance and noise immunity. |
| N/C (Pin 3) | No-connect terminal | Internally unconnected; must remain floating - no routing or soldering allowed. |
| VOUT (Pin 4) | Regulated output node | Delivers adjustable output; requires ≥1µF ceramic output capacitor for stability and transient response. |
| VOUT Sense (Pin 5) | Feedback sense point | Mandatory connection to VOUT (Pin 4); enables remote sensing to compensate for PCB trace IR drop. |
| ADJ (Pin ?) | Adjustable reference input | Not present on LP8340ILDX-ADJ/NOPB - this variant uses dedicated ADJ pin (Pin 5 is VOUT Sense; ADJ is Pin 3? Wait - correction: per Figure 2 and Package Diagram, ADJ is Pin 3 for adjustable version. But J-column data and TI package drawing NGD0006A confirm LP8340ILDX-ADJ/NOPB uses Pin 3 as ADJ, not N/C. Re-evaluating: "LP8340" block diagram shows ADJ pin; "Figure 2. Adjustable VOUT" labels Pin 3 as ADJ; "Connection Diagrams" bottom view for adjustable version shows Pin 3 = ADJ; "PACKAGE OPTION ADDENDUM" confirms LP8340ILDX-ADJ/NOPB is adjustable version. Therefore Pin 3 is ADJ, not N/C. Prior N/C assignment was erroneous. Corrected below. |
Correction: Per TI SNVS221D datasheet Figures 2 and 4, and Package Number NGD0006A, the LP8340ILDX-ADJ/NOPB (adjustable version) has Pin 3 = ADJ, not N/C. Revised pin table:
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1 & 6) | Input supply connection | Must be externally shorted for full 1.0A operation (500mA max per pin); decoupling requires ≥1µF ceramic near each pin. |
| GND (Pin 2) | Power and signal reference | Primary ground return; connects to exposed thermal pad - essential for thermal performance and noise immunity. |
| ADJ (Pin 3) | Output voltage setting input | Connects to resistor divider (R1/R2) to set VOUT = 1.25V × (1 + R1/R2); leakage <±100nA minimizes divider current error. |
| VOUT (Pin 4) | Regulated output node | Delivers adjustable output; requires ≥1µF ceramic output capacitor for stability and transient response. |
| VOUT Sense (Pin 5) | Feedback sense point | Mandatory connection to VOUT (Pin 4); enables remote sensing to compensate for PCB trace IR drop. |
| - | - | Pin 6 is second VIN terminal - no separate function beyond parallel input connection. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base drive current, keeping ground current <50µA across full operating range - critical for battery runtime. |
| Zener-Trimmed Bandgap Reference | Provides ±1.5% VOUT tolerance over −40°C to 125°C - ensures consistent voltage accuracy without calibration. |
| Foldback Current Limit | Reduces output current to ~450mA under high-VIN−VOUT overload, lowering power dissipation and preventing thermal runaway. |
| Thermal Overload Protection | Shuts down at 160°C with 10°C hysteresis - protects device and system during sustained overloads or poor heatsinking. |
| WSON-6 Package | 2.0mm × 2.0mm footprint with thermal pad - saves >60% board area vs. SOT-223 while enabling 1.0A continuous output. |
Applications
| Battery-Powered Instrumentation | Industrial Sensor Nodes |
|---|---|
Use Scenario: Portable multimeter powering 16-bit SAR ADC and LCD driver from single 3.7V Li-ion cell. IC Role / Device Role: Primary low-noise 3.3V rail generator with remote sensing to maintain accuracy despite PCB trace resistance. Use Value: 250µVrms output noise and 48dB ripple rejection preserve ADC ENOB; 19µA IQ extends battery life to >12 months in sleep mode. |
Use Scenario: Wireless temperature transmitter using ultra-low-power MCU and RF transceiver in harsh factory environment. IC Role / Device Role: Stable 1.8V core supply with thermal shutdown guarding against enclosure overheating. Use Value: 160°C thermal cutoff prevents field failure; ±1.5% VOUT tolerance ensures reliable MCU clocking and sensor biasing across −40°C to 85°C ambient. |
| Notebook Subsystem Rail | Hard Disk Drive Logic Supply |
Use Scenario: Dedicated 2.5V supply for notebook touchpad controller and USB PHY, derived from main 5V rail. IC Role / Device Role: Low-dropout post-regulator minimizing voltage headroom loss and heat generation in thin form factor. Use Value: 420mV dropout at 1.0A allows operation from 2.9V input - maximizes usable battery voltage range and reduces thermal load on chassis. |
Use Scenario: 3.3V logic rail for HDD servo controller and interface ASIC, powered from 5V intermediate bus. IC Role / Device Role: High-PSRR linear regulator suppressing switching noise from upstream buck converter. Use Value: 48dB ripple rejection at 120Hz prevents data corruption in servo loop; foldback current limit avoids catastrophic failure during motor stall events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TES/V33 | Fixed 3.3V output only; integrates enable and reset functions; higher IQ (45µA). | Suitable for fixed-rail systems requiring supervision, but not for adjustable-voltage designs. | Select only if 3.3V output and integrated monitoring are required - not a drop-in replacement for LP8340ILDX-ADJ/NOPB. |
| TPS7A2025PDQNR | 250mA output; 1.6V–6.0V input; 25µA IQ; 1.2V–5.5V adjustable output; same WSON-6 package. | Lower current rating limits use to low-power peripherals; superior PSRR (70dB) benefits noise-sensitive analog stages. | Choose when 250mA suffices and higher PSRR is prioritized - requires redesign for current capability and feedback network. |
Compared with TLS850F0TES/V33 and TPS7A2025PDQNR, the LP8340ILDX-ADJ/NOPB uniquely delivers 1.0A adjustable output in WSON-6 with sub-50µA ground current, making it irreplaceable for high-current, battery-critical applications where both adjustability and efficiency are mandatory.
Availability
LP8340ILDX-ADJ/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor nodes, notebook subsystem rails, and hard disk drive logic supplies requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LP8340ILDX-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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and personal electronics markets.
The LP8340ILDX-ADJ/NOPB belongs to TI's precision linear regulator product line, engineered for ultra-low quiescent current and high accuracy in space-constrained, battery-dependent applications such as portable test equipment and wireless sensors.
FAQ
What is the minimum load current required for stable regulation with LP8340ILDX-ADJ/NOPB?
The LP8340ILDX-ADJ/NOPB requires a minimum load current of 100µA across its full operating temperature range (−40°C to 125°C) to maintain regulation and stability. If actual load falls below this threshold, a bleed resistor (RL = VOUT/100µA) must be placed between VOUT and GND. This requirement is specified in the Electrical Characteristics tables for both LP8340C and LP8340I versions and applies directly to LP8340ILDX-ADJ/NOPB.
Can LP8340ILDX-ADJ/NOPB operate with a 2.5V input when regulating to 1.8V?
No - LP8340ILDX-ADJ/NOPB has a minimum input voltage of 2.7V, as stated in the Absolute Maximum Ratings and Operating Ratings sections. Attempting to operate at 2.5V violates the specified operating condition and will result in loss of regulation. For 1.8V output, the minimum valid input is 2.7V, yielding only 0.9V headroom - sufficient given its 680mV typical dropout at 800mA for the 1.8V version.
How should the VOUT Sense pin be connected on LP8340ILDX-ADJ/NOPB?
Pin 5 (VOUT Sense) on LP8340ILDX-ADJ/NOPB must be connected directly to Pin 4 (VOUT) using a low-impedance PCB trace. This connection enables internal remote sensing to compensate for voltage drop across output traces. Leaving VOUT Sense unconnected or routing it separately invalidates regulation accuracy and may cause instability - the datasheet explicitly states "VOUT Sense (Pin 5) must be connected to VOUT (Pin 4)."
What is the thermal resistance (θJA) of LP8340ILDX-ADJ/NOPB in its WSON-6 package?
The junction-to-ambient thermal resistance (θJA) for LP8340ILDX-ADJ/NOPB is not a fixed value - it depends entirely on PCB layout: copper area, layer count, and thermal via count under the exposed pad. TI Application Note AN-1187 (SNOA401) provides layout guidelines to achieve optimal θJA. The datasheet omits a single θJA number because performance varies significantly with implementation - users must simulate or measure based on their specific board design.
Does LP8340ILDX-ADJ/NOPB support ceramic output capacitors?
Yes - LP8340ILDX-ADJ/NOPB is explicitly characterized and stabilized for use with ≥1µF ceramic (X7R) output capacitors, as confirmed in the "EXTERNAL CAPACITOR" section and Typical Performance Characteristics. The datasheet recommends 1µF–10µF values; 1µF provides adequate stability, while larger values improve load-transient response and PSRR. Aluminum/tantalum electrolytics are also acceptable, but ceramic is preferred for size and ESR advantages.
LP8340ILDX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 9.3V
- Voltage Dropout (Max):
- -
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 170 µA
- PSRR:
- 55dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (2.92x3.29)
LP8340ILDX-ADJ/NOPB FAQ
1.How can I place an order for LP8340ILDX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP8340ILDX-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 LP8340ILDX-ADJ/NOPB reliable?
The price and inventory of LP8340ILDX-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 LP8340ILDX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP8340ILDX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP8340ILDX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP8340ILDX-ADJ/NOPB?
LP8340ILDX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP8340ILDX-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 LP8340ILDX-ADJ/NOPB?
For technical support, including LP8340ILDX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP8340ILDX-ADJ/NOPB requirements.
6.How does Aetrix verify that LP8340ILDX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP8340ILDX-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 LP8340ILDX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP8340ILDX-ADJ/NOPB?
All LP8340ILDX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP8340ILDX-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 LP8340ILDX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP8340ILDX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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