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Texas Instruments LP3990SD-1.2
- Part No.:
- LP3990SD-1.2
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP3990SD-1.2.pdf
- Description:
- IC REG LINEAR 1.2V 150MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,652
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Product details
Overview
LP3990SD-1.2 from Texas Instruments is a 150mA low-noise linear voltage regulator delivering a fixed 1.2V output with ±1.5% tolerance over temperature, stable with 1.0µF ceramic capacitors, and featuring logic-controlled enable (VEN), 43µA quiescent current in active mode, and <10nA shutdown current - designed for power-sensitive digital subsystems in portable electronics.
For engineers reviewing the LP3990SD-1.2 datasheet, LP3990SD-1.2 pinout, LP3990SD-1.2 application, or LP3990SD-1.2 equivalent, key selection criteria include dropout voltage (120–200mV at 150mA), PSRR (55dB @ 1kHz), fast startup time (105µs), thermal shutdown (155°C), and WSON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LP3990SD-1.2 employs a PMOS pass transistor architecture enabling ultra-low dropout and near-zero reverse leakage during shutdown. Its internal 1MΩ pulldown on VEN ensures default-off behavior without external components, and its stability with 1.0µF ceramic output capacitors eliminates need for noise-bypass caps.
Specified for −40°C to +125°C junction operation, it delivers 1.2V output across 2.0–6.0V input range with load regulation error ≤±0.008%/mA (DSBGA) and line regulation error ≤±0.1%/V - optimized for battery-powered systems where input voltage sags under load and thermal margin is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±1.5% over −40°C to +125°C - ensures consistent core/logic rail for ASICs, FPGAs, and microcontrollers. |
| Max Output Current | 150mA continuous - sufficient for low-power processors, memory interfaces, and sensor signal chains. |
| Quiescent Current | 43µA (enabled), <10nA (disabled) - extends battery life in always-on or duty-cycled applications. |
| Dropout Voltage | 120–200mV at 150mA - enables operation down to VIN = 1.32V, critical for single-cell Li-ion or Li-poly systems. |
| PSRR | 55dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails. |
| Output Noise | 150µVRMS (10Hz–100kHz) - meets low-noise requirements for RF biasing, ADC references, and precision analog circuits. |
| Startup Time | 105µs to 95% of 1.2V - supports rapid wake-up sequences in sleep-mode recovery without timing violations. |
Pinout & Package
LP3990SD-1.2 is packaged in a 6-pin WSON (WQFN) package (NGG0006A), 2.0mm × 2.0mm × 0.75mm, with exposed thermal pad. The package is RoHS-compliant and moisture-sensitive level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 6) | Input supply connection | Accepts 2.0–6.0V; requires 1.0µF ceramic capacitor placed ≤1cm from pin to minimize input inductance and ensure stability. |
| GND (Pin 5) | Power ground reference | Must be connected to PCB ground plane; ties to exposed thermal pad for thermal dissipation and noise reduction. |
| VEN (Pin 4) | Enable control input | Active-high logic interface (VIH ≥0.95V, VIL ≤0.4V); internal 1MΩ pulldown ensures safe default-off state. |
| VOUT (Pin 1) | Regulated output | Delivers fixed 1.2V; requires 1.0µF ceramic capacitor (X7R recommended) with ESR 5–500mΩ for stability. |
| NC (Pin 2) | No connection | Internally unconnected; must remain floating - no routing or soldering permitted. |
| NC (Pin 3) | No connection | Internally unconnected; must remain floating - no routing or soldering permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1.0µF ceramic output cap | Eliminates need for larger, costlier tantalum or electrolytic capacitors - reduces BOM count and board area by >50% vs legacy LDOs. |
| Logic-controlled enable with internal pulldown | Removes requirement for external pull-down resistor - simplifies layout and improves reliability in high-density portable designs. |
| Ultra-low shutdown IQ (<10nA) | Enables multi-year battery life in IoT endpoint devices operating in deep-sleep modes with periodic wake-ups. |
| Thermal overload and short-circuit protection | Auto-recovery shutdown at 155°C with 15°C hysteresis prevents permanent damage during transient overloads or PCB faults. |
| No noise-bypass capacitor required | Reduces component count and layout complexity while maintaining 150µVRMS output noise - ideal for RF and mixed-signal SoC power domains. |
Applications
| Mobile Baseband Power | Wearable Sensor Hub |
|---|---|
Use Scenario: Powers baseband processor I/O and memory interface in LTE/5G smartphones where input voltage varies from 3.2V (discharged battery) to 4.4V (fully charged). IC Role / Device Role / Timing Role: Low-noise, fast-response LDO supplying clean 1.2V to DDR I/O banks and SerDes PHYs. Use Value: 55dB PSRR at 1kHz rejects ripple from buck converter switching at 2MHz, preventing bit errors in high-speed data links. |
Use Scenario: Supplies 1.2V to ultra-low-power MCU and inertial measurement unit (IMU) in fitness trackers operating 24/7 on coin-cell batteries. IC Role / Device Role / Timing Role: Always-on regulator with <10nA shutdown IQ, enabled only during sensor sampling bursts. Use Value: 43µA active IQ and 105µs startup enable sub-100ms wake-up cycles, extending battery life beyond 12 months. |
| Medical Patch Monitor | Industrial Wireless Node |
Use Scenario: Provides regulated 1.2V to analog front-end (AFE) and BLE radio in disposable ECG patch requiring clinical-grade signal integrity. IC Role / Device Role / Timing Role: Precision LDO with ±1.5% output accuracy and 150µVRMS noise powering ADC reference and op-amp stages. Use Value: Stable 1.0µF ceramic support avoids aging drift and ESR variation seen in tantalum caps - ensuring long-term calibration stability. |
Use Scenario: Powers LoRa transceiver and microcontroller in battery-operated smart meter node deployed in −40°C to +85°C outdoor environments. IC Role / Device Role / Timing Role: Wide-temp LDO with −40°C to +125°C junction rating and thermal shutdown protecting against enclosure overheating. Use Value: 120–200mV dropout allows full utilization of 2.0–3.6V lithium-thionyl chloride battery range, maximizing usable energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F12PDBVR | 150mA, 1.2V fixed, 25µA IQ (active), 50nA shutdown; WSON-6; 120mV dropout @ 150mA. | Slightly lower active IQ but higher shutdown IQ; identical package and pinout. | Preferred when lowest possible active current dominates system budget, and shutdown IQ >10nA is acceptable. |
| MCP1700T-1202E/TT | 250mA, 1.2V fixed, 1.6µA IQ (active), 500nA shutdown; SOT-23-5; 600mV dropout @ 250mA. | Higher max current but much higher dropout and different package/pinout - not drop-in. | Consider only if higher output current is required and board redesign for SOT-23 is feasible. |
Compared with TPL720F12PDBVR, LP3990SD-1.2 offers lower shutdown IQ (<10nA vs 50nA) critical for multi-year battery life, while MCP1700T-1202E/TT trades off dropout and package compatibility for ultra-low active IQ - making LP3990SD-1.2 optimal for compact, thermally constrained, always-on portable systems.
Availability
LP3990SD-1.2 is available at Aetrix Electronics and suitable for mobile baseband power, wearable sensor hubs, medical patch monitors, and industrial wireless nodes requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for LP3990SD-1.2 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, embedded processing, and connectivity technologies, with decades of expertise in power management IC design and manufacturing.
The LP3990SD-1.2 belongs to TI's LP3990 family of low-noise, low-IQ LDOs engineered specifically for portable, battery-powered digital systems demanding high accuracy, small footprint, and robust thermal performance.
FAQ
What is the maximum input voltage rating for the LP3990SD-1.2?
The LP3990SD-1.2 has an absolute maximum input voltage of 6.5V, but its specified operating input range is 2.0V to 6.0V. Operation above 6.0V risks exceeding electrical limits and may cause permanent damage. For reliable long-term use, VIN should be maintained within the 2.0–6.0V operating range per the datasheet.
Does the LP3990SD-1.2 require an external pull-down resistor on the VEN pin?
No - the LP3990SD-1.2 integrates a 1MΩ internal pulldown resistor on the VEN pin, ensuring the device remains disabled by default when the enable signal is unconnected or floating. Adding an external pull-down is unnecessary and may interfere with intended logic-level control.
Can the LP3990SD-1.2 operate stably with a 0.47µF output capacitor?
No - the LP3990SD-1.2 is characterized and guaranteed stable only with ≥1.0µF ceramic output capacitance (0.7µF minimum, 5–500mΩ ESR). Using 0.47µF violates the stability condition and may cause oscillation or poor transient response; the datasheet explicitly recommends 1.0µF as the standard value.
What is the thermal resistance (θJA) of the LP3990SD-1.2 in its WSON-6 package?
The LP3990SD-1.2 in the NGG0006A WSON-6 package has a typical junction-to-ambient thermal resistance (θJA) of 88°C/W under standard JEDEC test conditions (2-layer board, 1-in² copper). Actual θJA depends heavily on PCB layout - adding thermal vias to the exposed pad reduces it significantly.
Is the LP3990SD-1.2 compatible with lead-free reflow processes?
Yes - the LP3990SD-1.2/NOPB variant is RoHS-compliant and qualified for lead-free reflow with MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and peak reflow temperature of 260°C, matching standard Pb-free assembly requirements.
LP3990SD-1.2 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):
- 1.2V
- 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-1.2 FAQ
1.How can I place an order for LP3990SD-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990SD-1.2 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-1.2 reliable?
The price and inventory of LP3990SD-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3990SD-1.2 is usually 5 days.
3.What payment methods are accepted for LP3990SD-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990SD-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990SD-1.2?
LP3990SD-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990SD-1.2 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-1.2?
For technical support, including LP3990SD-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990SD-1.2 requirements.
6.How does Aetrix verify that LP3990SD-1.2 is sourced from the original manufacturer or authorized distributors?
All LP3990SD-1.2 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-1.2 meets industry standards.
7.What is the process for return or replacement of LP3990SD-1.2?
All LP3990SD-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LP3990SD-1.2, 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-1.2 part is unused and in its original packaging.
Return procedure for LP3990SD-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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