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Texas Instruments LP3990SD-1.8
- Part No.:
- LP3990SD-1.8
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP3990SD-1.8.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,325
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Product details
Overview
LP3990SD-1.8 from Texas Instruments is a 150mA low-noise linear voltage regulator in a 6-pin WQFN package, delivering a fixed 1.8V output with ±1.5% tolerance over −40°C to +125°C, 43µA quiescent current in active mode, and <10nA shutdown current-designed for power-sensitive digital loads in portable battery-powered systems.
For engineers reviewing the LP3990SD-1.8 datasheet, LP3990SD-1.8 pinout, LP3990SD-1.8 application, or LP3990SD-1.8 equivalent, key selection criteria include ceramic-capacitor stability (1.0µF min), fast 105µs startup, 150µVRMS output noise, 55dB PSRR at 1kHz, and logic-controlled enable with internal 1MΩ pulldown.
Technical Context
The LP3990SD-1.8 operates across 2.0–6.0V input range and maintains regulation down to 1.8V output with 200mV typical dropout at 150mA load. Its LDO architecture uses internal PMOS pass transistor and precision bandgap reference to achieve 1% room-temperature accuracy and ±2.5% full-range line/load regulation.
It integrates thermal-overload and short-circuit protection, supports no-load stability, and features an active-high enable pin (VIH = 0.95V, VIL = 0.4V) with 0.002–0.2µA leakage-enabling seamless integration into power sequencing and low-power sleep/wake architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% (WQFN package, −40°C to +125°C junction) |
| Max Output Current | 150mA continuous-supports core logic rails for microcontrollers and baseband ICs |
| Quiescent Current | 43µA (enabled), <10nA (disabled)-enables multi-day battery life in standby mode |
| Input Voltage Range | 2.0V to 6.0V-compatible with single-cell Li-ion (3.0–4.2V), LiFePO₄, or dual-cell alkaline inputs |
| Output Capacitor | Stable with 1.0µF ceramic (X7R/X5R), ESR 5–500mΩ-eliminates need for bulky tantalum or electrolytic caps |
| Noise Performance | 150µVRMS (10Hz–100kHz)-meets noise-sensitive analog supply requirements for ADCs and RF front-ends |
| PSRR | 55dB at 1kHz-suppresses switching noise from upstream DC/DC converters |
| Startup Time | 105µs to 95% of 1.8V-ensures rapid power-up for wake-from-sleep sequences |
Pinout & Package
LP3990SD-1.8 is packaged in a 6-pin WQFN (NGG0006A), 2.0mm × 2.0mm × 0.8mm body, exposed thermal pad, RoHS-compliant lead-free finish (CuSn), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 6) | Power input supply | Accepts 2.0–6.0V; requires 1.0µF ceramic capacitor placed ≤1cm from pin and connected to clean analog ground |
| GND (Pin 5) | Common ground reference | Must be connected to PCB ground plane; ties to exposed thermal pad for thermal dissipation and noise control |
| VEN (Pin 4) | Logic-enable input | Active-high control: ≥0.95V enables regulator; ≤0.4V disables it; internal 1MΩ pulldown ensures default-off state |
| N/C (Pin 3) | No connection | Not internally bonded-must remain unconnected and unstubbed on PCB |
| VOUT (Pin 1) | Regulated output | Delivers stable 1.8V; requires 1.0µF ceramic capacitor directly between this pin and GND for stability |
| N/C (Pin 2) | No connection | Not internally bonded-must remain unconnected and unstubbed on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 43µA active / <10nA shutdown-extends battery runtime in always-on sensor nodes and IoT endpoints |
| Ceramic-capacitor stability | Guaranteed stable with 1.0µF X7R/X5R ceramic output cap-reduces board area and BOM cost vs. tantalum |
| No noise bypass capacitor required | 150µVRMS output noise achieved without external noise-reduction capacitors-simplifies layout and saves space |
| Thermal and short-circuit protection | Internal shutdown at 155°C with 15°C hysteresis and 550–1000mA current limit-prevents damage during fault conditions |
| Logic-compatible enable | VIH = 0.95V, VIL = 0.4V-directly driven by 1.8V/3.3V GPIOs without level-shifting |
| Wide temperature operation | Specified from −40°C to +125°C junction-suitable for automotive infotainment, industrial handhelds, and outdoor edge devices |
Applications
| Smartphone Baseband Power | Wearable Sensor Hub Supply |
|---|---|
Use Scenario: Powers ARM Cortex-M4-based sensor fusion MCU and MEMS accelerometers/gyros in compact wearable form factor. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying digital I/O and core logic rails with tight noise and transient response requirements. Use Value: 150µVRMS noise and 55dB PSRR prevent coupling of switching noise from buck converter into sensor data path, preserving 16-bit ADC accuracy. |
Use Scenario: Supplies real-time clock (RTC), low-power BLE SoC, and EEPROM in coin-cell–powered fitness tracker. IC Role / Device Role / Timing Role: Always-on regulated rail enabling sub-µA deep-sleep current and fast wake-up (<110µs). Use Value: <10nA shutdown IQ and 105µs startup time allow 3+ year battery life while maintaining responsive user interface wake latency. |
| Industrial Handheld Terminal | Automotive Infotainment Display Interface |
Use Scenario: Provides 1.8V supply to FPGA configuration memory and display driver interface in ruggedized barcode scanner. IC Role / Device Role / Timing Role: Secondary LDO decoupling high-speed digital interfaces from noisy main 3.3V rail. Use Value: 200mV dropout and −40°C to +125°C operation ensure reliable boot and function across extreme ambient temperatures and battery voltage sag. |
Use Scenario: Powers LVDS serializer/deserializer and touch controller in automotive-grade head unit display module. IC Role / Device Role / Timing Role: Low-noise auxiliary rail isolating sensitive timing circuits from engine-bay EMI and alternator ripple. Use Value: 55dB PSRR at 1kHz attenuates alternator switching noise, preventing visual artifacts and touch jitter in TFT-LCD displays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F18 | 1.8V, 200mA, 25µA IQ, 75µVRMS noise, WSON-6 package | Lower noise and higher current, but tighter VIN min (1.7V) limits use with deeply discharged batteries | Preferred when ultra-low noise (<80µVRMS) and >150mA margin are required; verify input voltage headroom in battery-depleted condition |
| MCP1700T-1802E/MB | 1.8V, 250mA, 1.6µA IQ (shutdown), SOT-23-5, no enable pin | Far lower shutdown IQ but lacks logic enable and has higher active IQ (4µA vs. 43µA); different pinout and footprint | Best for always-on, non-sequenced rails where enable control is unnecessary and minimum shutdown IQ dominates design priority |
Compared with TPL720F18 and MCP1700T-1802E/MB, LP3990SD-1.8 offers balanced performance: superior enable functionality and thermal robustness versus MCP1700, and better input voltage flexibility versus TPL720-making it optimal for battery-powered digital systems requiring controlled power sequencing and wide VIN operation.
Availability
LP3990SD-1.8 is available at Aetrix Electronics and suitable for smartphone baseband power, wearable sensor hub supply, industrial handheld terminal, and automotive infotainment display interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP3990SD-1.8 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LP3990 series was developed specifically for portable, battery-powered digital systems demanding high accuracy, ultra-low noise, ceramic-capacitor compatibility, and minimal quiescent current-targeting cellular handsets, handheld information appliances, and other space-constrained consumer electronics.
FAQ
What is the output voltage tolerance of LP3990SD-1.8 over temperature and load?
The LP3990SD-1.8 has a guaranteed output voltage tolerance of ±1.5% over the full operating junction temperature range (−40°C to +125°C) and full load (0–150mA) for the WQFN package. At room temperature only, the tolerance tightens to ±1%. This specification is validated per TI's SNVS251I datasheet Electrical Characteristics table under ΔVOUT parameter.
Does LP3990SD-1.8 require an external bypass capacitor for noise reduction?
No, the LP3990SD-1.8 does not require an external noise bypass capacitor. Its internal design achieves 150µVRMS output noise (10Hz–100kHz) with only a 1.0µF ceramic output capacitor. The "No Noise Bypass Capacitor Required" feature is explicitly stated in the datasheet Features section and confirmed in Application Hints.
What is the maximum input voltage rating for LP3990SD-1.8?
The absolute maximum input voltage for LP3990SD-1.8 is 6.5V, but the recommended operating input voltage range is 2.0V to 6.0V. Exceeding 6.0V risks violating the Absolute Maximum Ratings and may trigger internal protection or cause permanent damage. This is specified in both the Absolute Maximum Ratings and Operating Ratings tables of the SNVS251I datasheet.
Can LP3990SD-1.8 operate with zero load current?
Yes, LP3990SD-1.8 remains stable and in regulation with no external load. The datasheet explicitly states "NO-LOAD STABILITY" as a design feature and confirms in Electrical Characteristics that ILOAD = 0µA is supported. This makes it suitable for CMOS RAM keep-alive and other always-on, low-current applications.
What package type and dimensions does LP3990SD-1.8 use?
LP3990SD-1.8 uses the WQFN-6 package (TI package code NGG0006A), measuring 2.0mm × 2.0mm × 0.8mm with an exposed thermal pad. It has 6 terminals: VIN, GND, VEN, two N/C pins, and VOUT. This is confirmed in the PACKAGE section, Pin Descriptions table, and PACKAGE OPTION ADDENDUM for orderable device LP3990SD-1.8/NOPB.
LP3990SD-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- 120 µA
- PSRR:
- 55dB ~ 35dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LP3990SD-1.8 FAQ
1.How can I place an order for LP3990SD-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990SD-1.8 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 LP3990SD-1.8 reliable?
The price and inventory of LP3990SD-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3990SD-1.8 is usually 5 days.
3.What payment methods are accepted for LP3990SD-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990SD-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990SD-1.8?
LP3990SD-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990SD-1.8 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 LP3990SD-1.8?
For technical support, including LP3990SD-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990SD-1.8 requirements.
6.How does Aetrix verify that LP3990SD-1.8 is sourced from the original manufacturer or authorized distributors?
All LP3990SD-1.8 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 LP3990SD-1.8 meets industry standards.
7.What is the process for return or replacement of LP3990SD-1.8?
All LP3990SD-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LP3990SD-1.8, 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 LP3990SD-1.8 part is unused and in its original packaging.
Return procedure for LP3990SD-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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