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Texas Instruments LP3990QTLX-2.8Q1
- Part No.:
- LP3990QTLX-2.8Q1
- Manufacturer:
- Texas Instruments
- Package:
- 4-WFBGA, DSBGA
- Datasheet:
-
LP3990QTLX-2.8Q1.pdf
- Description:
- IC REG LINEAR 2.8V 150MA 4DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
LP3990QTLX-2.8Q1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 150-mA low-noise linear voltage regulator delivering a precise 2.8 V output from 2 V to 6 V input, with 1% room-temperature accuracy, 43 µA quiescent current (enabled), and stable operation using only 1 µF ceramic input/output capacitors. It serves as the primary power supply for low-voltage digital subsystems in infotainment and body electronics.
For engineers reviewing the LP3990QTLX-2.8Q1 datasheet, LP3990QTLX-2.8Q1 pinout, LP3990QTLX-2.8Q1 application, or LP3990QTLX-2.8Q1 equivalent, key selection considerations include its 2.8 V fixed output, DSBGA-4 package footprint, 120 mV dropout at 150 mA, 150 µVRMS output noise, and logic-controlled enable with internal 1-MΩ pulldown - all validated for –40°C to +125°C junction temperature operation.
Technical Context
The LP3990QTLX-2.8Q1 implements a PMOS pass transistor architecture enabling ultra-low quiescent current and fast 105 µs startup time. Its internal reference and error amplifier maintain regulation across line (2 V–6 V), load (0–150 mA), and temperature (–40°C to +125°C) variations with ±1% initial accuracy and <±2.5% total tolerance.
Enable control is active-high with VIH = 0.95 V and VIL = 0.4 V, supported by an integrated 1-MΩ pulldown resistor ensuring default-off behavior. Protection includes thermal shutdown at ~155°C with 15°C hysteresis and short-circuit current limiting at 550–1000 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±1% at 25°C; maintains regulation over full automotive temperature range. |
| Max Output Current | 150 mA continuous; supports digital SoCs, microcontrollers, and sensors without external heatsinking. |
| Dropout Voltage | 120 mV (typ) at 150 mA; enables operation down to VIN = 2.92 V while sustaining 2.8 V output. |
| Quiescent Current | 43 µA (typ) when enabled; ensures minimal battery drain in always-on vehicle modules. |
| Output Noise | 150 µVRMS (10 Hz–100 kHz); suitable for noise-sensitive analog/digital mixed-signal circuits. |
| PSRR | 55 dB at 1 kHz; suppresses ripple from upstream switching converters feeding the LDO input. |
| Enable Threshold | VIH = 0.95 V (min), VIL = 0.4 V (max); compatible with 1.8 V/3.3 V GPIO without level-shifting. |
Pinout & Package
LP3990QTLX-2.8Q1 uses a 1.324 mm × 1.045 mm DSBGA-4 (YZR) package with bottom-side solder balls. The package is moisture-sensitive level 1 (MSL-1) and requires no special handling per TI SNVSA66A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Common ground reference for all internal circuitry and external capacitors; must connect directly to low-impedance PCB ground plane. |
| A2 | EN | Active-high enable input with internal 1-MΩ pulldown; drives regulator ON when ≥0.95 V, OFF when ≤0.4 V. |
| B1 | OUT | Regulated 2.8 V output; requires 1 µF ceramic capacitor (X7R/X5R) placed within 1 cm of this pin. |
| B2 | IN | Input supply (2 V–6 V); requires 1 µF ceramic capacitor placed within 1 cm of this pin and connected to GND. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation in automotive infotainment and body control modules. |
| Virtually zero IQ in shutdown | ≤0.2 nA typical shutdown current enables long-term battery retention in parked-vehicle applications. |
| Stable with 1 µF ceramic capacitors | Eliminates need for larger, costly tantalum or electrolytic capacitors - reduces BOM cost and board area. |
| No noise bypass capacitor required | Integrated noise filtering enables clean 2.8 V rail for ADCs, PLLs, and RF receivers without external RC networks. |
| Fast 105 µs startup time | Supports rapid system wake-up from sleep modes in telematics and ADAS subsystems. |
Applications
| Infotainment Power Rail | Instrument Cluster MCU Supply |
|---|---|
Use Scenario: Powers audio DSP, touchscreen controller, and Bluetooth/Wi-Fi SoC in head-unit systems requiring low-noise, always-on standby capability. IC Role / Device Role / Timing Role: Primary 2.8 V LDO supplying core logic and I/O domains of multi-core infotainment processors. Use Value: 150 µVRMS noise and 55 dB PSRR prevent audible artifacts and data corruption during RF transmission bursts. |
Use Scenario: Supplies 2.8 V to 32-bit ARM Cortex-M7 MCU and CAN transceiver in digital instrument clusters with strict EMI limits. IC Role / Device Role / Timing Role: Regulated power source for real-time safety-critical firmware execution and CAN FD communication timing. Use Value: 1% output accuracy and thermal shutdown at 155°C ensure deterministic behavior under dashboard temperature extremes. |
| Body Control Module Sensor Interface | ADAS Camera Module Bias Supply |
Use Scenario: Provides stable 2.8 V to Hall-effect position sensors, LIN transceivers, and EEPROM in door module ECUs. IC Role / Device Role / Timing Role: Low-quiescent-current bias supply enabling >10-year battery life in keyless entry and occupancy detection systems. Use Value: 43 µA IQ (enabled) and <0.2 nA IQ (disabled) minimize parasitic drain during vehicle sleep states. |
Use Scenario: Delivers clean 2.8 V to image sensor analog front-end and ISP in rear-view and surround-view camera modules. IC Role / Device Role / Timing Role: Precision analog supply decoupling high-speed pixel readout and ADC conversion clocks. Use Value: Fast 105 µs start-up synchronizes power delivery with camera frame trigger signals, eliminating boot delay artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7B6728QPWPRQ1 | Higher 250 mA output, 200 mV dropout, 60 µA IQ; requires 2.2 µF output capacitor. | Targeted at higher-current loads like motor drivers or multi-rail PMICs; less space-constrained designs. | Select when >150 mA load current or tighter transient response is required; accepts same 2.8 V output but larger footprint (HTSSOP-6). |
| TLV73328PQDBVRQ1 | Lower 300 mA output, 170 mV dropout, 30 µA IQ; stable with 1 µF ceramic but lacks AEC-Q100 Grade 1 rating. | Intended for non-safety-critical interior lighting or HVAC controls; not qualified for instrument cluster use. | Choose for cost-sensitive cabin modules where Grade 1 qualification is unnecessary; same DSBGA-4 size but lower thermal robustness. |
Compared with TPS7B6728QPWPRQ1 and TLV73328PQDBVRQ1, the LP3990QTLX-2.8Q1 uniquely balances ultra-low noise (150 µVRMS), minimal footprint (DSBGA-4), and full AEC-Q100 Grade 1 compliance - making it optimal for space-constrained, noise-sensitive automotive digital rails where 150 mA suffices.
Availability
LP3990QTLX-2.8Q1 is available at Aetrix Electronics and suitable for automotive infotainment, instrument cluster, and body electronics applications requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LP3990QTLX-2.8Q1 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and personal electronics markets.
The LP3990QTLX-2.8Q1 belongs to TI's automotive-grade LDO portfolio designed specifically for low-noise, low-power digital subsystems in modern vehicles - emphasizing small size, high accuracy, and robust thermal performance.
FAQ
What is the exact output voltage tolerance of the LP3990QTLX-2.8Q1 over temperature and load?
The LP3990QTLX-2.8Q1 guarantees ±1% output voltage accuracy at room temperature and ±2.5% over full operating conditions (–40°C to +125°C junction temperature, 0–150 mA load, 2–6 V input). This is confirmed in Section 6.5 of the SNVSA66A datasheet under "Output voltage tolerance" with min/max limits of –2.5% and +2.5%.
Does the LP3990QTLX-2.8Q1 require an external pull-up resistor on the EN pin?
No. The LP3990QTLX-2.8Q1 includes an internal 1-MΩ pulldown resistor on the EN pin, ensuring default-off behavior when left floating. An external pull-up is only needed if active-high logic control from a low-drive-strength source (e.g., open-drain MCU GPIO) is used - otherwise, direct connection to 1.8 V or 3.3 V logic is sufficient.
Can the LP3990QTLX-2.8Q1 operate with a 1.8 V input voltage?
No. The LP3990QTLX-2.8Q1 has a minimum input voltage of 2 V per Section 6.3 of the datasheet. At 2.8 V output, the absolute minimum input is VOUT + VDO = 2.8 V + 0.12 V = 2.92 V under 150 mA load; therefore, 1.8 V is below both the functional and dropout thresholds and will not regulate.
Is the LP3990QTLX-2.8Q1 compatible with X5R ceramic capacitors for CIN and COUT?
Yes. The LP3990QTLX-2.8Q1 is explicitly characterized and stable with 1 µF X5R, X7R, Y5V, or Z5U ceramic capacitors (Section 6.6 and 8.2.2.4). X5R is recommended for applications operating up to +85°C ambient; X7R is preferred for full –40°C to +125°C range due to tighter capacitance drift.
What thermal protection features does the LP3990QTLX-2.8Q1 include?
The LP3990QTLX-2.8Q1 integrates thermal shutdown that disables the output when junction temperature reaches ~155°C, with ~15°C hysteresis (re-enabling at ~140°C). This protects against sustained overload or poor PCB thermal design, as documented in Section 7.3.2 and Table 6.5 under "Thermal shutdown".
LP3990QTLX-2.8Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 4-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.8V
- 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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-DSBGA (1x1)
LP3990QTLX-2.8Q1 FAQ
1.How can I place an order for LP3990QTLX-2.8Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3990QTLX-2.8Q1 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 LP3990QTLX-2.8Q1 reliable?
The price and inventory of LP3990QTLX-2.8Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3990QTLX-2.8Q1 is usually 5 days.
3.What payment methods are accepted for LP3990QTLX-2.8Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3990QTLX-2.8Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3990QTLX-2.8Q1?
LP3990QTLX-2.8Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3990QTLX-2.8Q1 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 LP3990QTLX-2.8Q1?
For technical support, including LP3990QTLX-2.8Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3990QTLX-2.8Q1 requirements.
6.How does Aetrix verify that LP3990QTLX-2.8Q1 is sourced from the original manufacturer or authorized distributors?
All LP3990QTLX-2.8Q1 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 LP3990QTLX-2.8Q1 meets industry standards.
7.What is the process for return or replacement of LP3990QTLX-2.8Q1?
All LP3990QTLX-2.8Q1 units undergo pre-shipment inspection (PSI). If there is an issue with LP3990QTLX-2.8Q1, 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 LP3990QTLX-2.8Q1 part is unused and in its original packaging.
Return procedure for LP3990QTLX-2.8Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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