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Texas Instruments LP2966IMMX-1818
- Part No.:
- LP2966IMMX-1818
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP2966IMMX-1818.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
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Product details
Overview
LP2966IMMX-1818 from National Semiconductor is a dual-channel ultra-low-dropout linear regulator delivering 150mA per output at precisely 1.8V/1.8V, operating from 2.7V to 7.0V input, with dropout as low as 0.9mV at 1mA and ±1% output voltage accuracy over temperature - ideal for powering dual-core microcontrollers or memory subsystems in space-constrained portable devices.
For engineers reviewing the LP2966IMMX-1818 datasheet, LP2966IMMX-1818 pinout, LP2966IMMX-1818 application, or LP2966IMMX-1818 equivalent, key selection criteria include independent shutdown control per channel, open-drain error flags with 10% undervoltage detection, MSOP-8 footprint compatibility, and guaranteed 150mA load capability across −40°C to +125°C junction temperature.
Technical Context
The LP2966IMMX-1818 integrates two independent PMOS-based LDO regulators sharing a common input and ground, each with dedicated active-low shutdown (SD1/SD2) and open-drain error flag (ERROR1/ERROR2) pins. Its architecture enables <1µA quiescent current in full shutdown while maintaining 300µA ground current at light load (1mA).
Each regulator features internal foldback current limiting (600mA knee), thermal shutdown at 165°C with 25°C hysteresis, and cross-regulation of only 0.0004mV/mA - ensuring stable 1.8V outputs even under asymmetric load transients between channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8V / 1.8V - fixed, factory-trimmed dual outputs with ±1% tolerance at room temperature and ±1.5% over full −40°C to +125°C range. |
| Max Output Current | 150mA per channel - guaranteed across full temperature range without derating below 125°C junction temperature. |
| Dropout Voltage | 135mV at 150mA load - enables operation from 2.7V input while sustaining 1.8V output; 0.9mV at 1mA supports ultra-low-power standby modes. |
| Ground Pin Current | 340µA at 100mA (one LDO active) - minimizes battery drain in always-on subsystems; drops to <1µA when both SD pins pulled low. |
| Error Flag Threshold | 10% below nominal output - open-drain ERROR1/ERROR2 assert low when VOUT falls to 1.62V, with 5% hysteresis for noise immunity. |
| PSRR @ 120Hz | 60dB at VIN = VOUT + 1V - suppresses ripple from upstream switching converters feeding the LP2966IMMX-1818 input. |
| Output Noise | 150µVrms (10Hz–100kHz) - low-noise performance critical for ADC references and RF bias rails. |
Pinout & Package
LP2966IMMX-1818 is housed in an MSOP-8 (Mini SO-8) surface-mount package (NS package code MUA08A), 3.0mm × 3.0mm × 1.0mm body, 0.65mm lead pitch, with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Input supply rail | Accepts 2.7V–7.0V; must be decoupled with ≥1µF capacitor close to pin to prevent instability. |
| 2 SD1 | Active-low shutdown for VOUT1 | Pull ≤0.1V to disable first regulator; requires pull-up resistor if driven by open-collector source. |
| 3 SD2 | Active-low shutdown for VOUT2 | Independent control enables staggered power sequencing or dynamic channel disabling. |
| 4 GND | Power ground reference | Common return for both regulators and error flags; connect directly to low-impedance ground plane. |
| 5 ERROR2 | Open-drain fault indicator for VOUT2 | Sinks current when VOUT2 drops ≤10%; must be pulled up externally (100kΩ–1MΩ) or tied to GND if unused. |
| 6 ERROR1 | Open-drain fault indicator for VOUT1 | Provides real-time monitoring of first output; invalid during SD1/SD2 assertion to reduce leakage. |
| 7 VOUT2 | Second regulated output | Delivers 1.8V at up to 150mA; requires ≥1µF ceramic or tantalum output capacitor for stability. |
| 8 VOUT1 | First regulated output | Delivers 1.8V at up to 150mA; electrically isolated from VOUT2 except via shared GND and VIN paths. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables separate power domains for core logic and I/O peripherals without external sequencing circuitry. |
| Ultra-low dropout | 135mV at 150mA allows operation from single-cell Li-ion (3.0V min) while delivering 1.8V to low-voltage FPGAs or DSPs. |
| Low-noise regulation | 150µVrms broadband noise ensures clean supply for precision analog circuits and high-speed serial interfaces. |
| Integrated error flags | Open-drain ERROR1/ERROR2 provide hardware-level fault signaling to microcontroller GPIOs without software polling. |
| Thermal & current protection | Foldback current limiting (600mA peak) and 165°C thermal shutdown prevent damage during sustained overload or poor heatsinking. |
Applications
| Mobile Baseband Processor Power | Industrial Sensor Node Core Supply |
|---|---|
|
Use Scenario: Dual-rail power for ARM Cortex-A series SoC requiring 1.8V for DDR I/O and 1.8V for core logic. IC Role / Device Role / Timing Role: Primary post-regulator converting switched-mode 3.3V supply to tightly regulated, low-noise 1.8V rails. Use Value: Independent shutdown allows dynamic core/I/O power gating; 150mA per channel supports burst-mode processing without voltage droop. |
Use Scenario: Battery-powered wireless sensor node with MCU, RF transceiver, and analog front-end. IC Role / Device Role / Timing Role: Single-package dual LDO supplying 1.8V to MCU core and 1.8V to RF IC, minimizing PCB area. Use Value: 340µA ground current at 100mA extends 2xAA alkaline battery life beyond 2 years in sleep-dominated operation. |
| Medical Wearable Display Backlight Bias | Automotive Infotainment USB PHY Supply |
|
Use Scenario: Compact wearable ECG monitor with OLED display requiring matched 1.8V rails for display controller and touch interface ASIC. IC Role / Device Role / Timing Role: Low-noise dual LDO eliminating switching ripple that could interfere with sensitive biopotential measurements. Use Value: 10% error flag threshold provides early warning of battery sag before display flicker occurs, enabling graceful shutdown. |
Use Scenario: In-vehicle infotainment head unit using USB 2.0 PHY requiring clean 1.8V supply for digital interface and 1.8V for analog transceiver section. IC Role / Device Role / Timing Role: Dual LDO replacing discrete regulators to meet AEC-Q200 temperature requirements in compact layout. Use Value: −40°C to +125°C junction rating ensures reliability in under-dash environments; MSOP-8 footprint simplifies thermal management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM1014IDT | Single 1.8V LDO (150mA), no second output or error flags; 200mV dropout at 150mA. | Lacks dual-output capability and fault monitoring - suitable only when one 1.8V rail suffices. | Select only if board redesign accommodates two separate single-LDO packages and removes error flag functionality. |
| TPS7A2018PDBVR | Single 1.8V LDO (300mA), 170mV dropout at 300mA, no shutdown independence or error flag. | Higher current but no dual-channel integration - requires two units plus external logic for sequencing. | Choose when higher per-rail current (>150mA) is mandatory and PCB area is not constrained. |
Compared with TSM1014IDT and TPS7A2018PDBVR, LP2966IMMX-1818 uniquely delivers matched dual 1.8V outputs with independent control and hardware fault signaling in a single MSOP-8 package - reducing BOM count, layout complexity, and system-level validation effort for space-sensitive dual-rail designs.
Availability
LP2966IMMX-1818 is available at Aetrix Electronics and suitable for mobile baseband power, industrial sensor nodes, medical wearables, automotive infotainment, and battery-backed real-time clock systems requiring stable component supply with long-term manufacturability.
Supply support for LP2966IMMX-1818 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
National Semiconductor (now part of Texas Instruments) specialized in high-performance analog and power management ICs, with a legacy of precision voltage regulation and low-noise design expertise.
The LP2966 product line was engineered for battery-powered portable electronics demanding ultra-low dropout, minimal quiescent current, and dual-output integration in minimal footprint - targeting cellular handsets, GPS modules, and handheld instrumentation.
FAQ
What is the minimum input voltage required for LP2966IMMX-1818 to maintain regulation?
The LP2966IMMX-1818 requires a minimum input voltage of 2.7V to sustain 1.8V output regulation across temperature and load. At 150mA load, the dropout is 135mV, so VIN must remain ≥1.935V above VOUT - meaning 2.7V is the absolute lower limit specified in the Absolute Maximum Ratings table. Operation below 2.7V risks loss of regulation and activation of ERROR flags.
Can LP2966IMMX-1818 operate with ceramic output capacitors?
Yes, LP2966IMMX-1818 is compatible with ceramic output capacitors for 1.8V outputs, provided they meet minimum 1µF capacitance and maintain stable ESR across temperature and frequency. X7R-type ceramics from Taiyo Yuden are explicitly validated in the datasheet for use with LP2966IMMX-1818 when load currents exceed 5mA.
How does the error flag on LP2966IMMX-1818 behave during shutdown?
When either SD1 or SD2 is pulled low, the corresponding ERROR pin (ERROR1 or ERROR2) becomes invalid and high-impedance - it does not reflect output status. The datasheet explicitly states that error flag functionality is disabled during shutdown to minimize leakage current, so LP2966IMMX-1818 ERROR pins should not be monitored while their respective regulators are disabled.
What is the thermal resistance (θJA) of the LP2966IMMX-1818 in its MSOP-8 package?
The LP2966IMMX-1818 has a junction-to-ambient thermal resistance (θJA) of 235°C/W when mounted on a standard PCB with minimum copper area. This value increases significantly with reduced copper pour; the datasheet recommends maximizing exposed pad soldering and thermal vias to improve heat dissipation and sustain full 150mA per channel at elevated ambient temperatures.
Is LP2966IMMX-1818 RoHS compliant and halogen-free?
Yes, LP2966IMMX-1818 complies with National Semiconductor's Banned Substances and Materials of Interest Specification (CSP-9-111S2), containing no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). It is fully RoHS-6 compliant and halogen-free per JEDEC J-STD-709.
LP2966IMMX-1818 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.27V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 600 µA
- PSRR:
- 60dB ~ 40dB (120Hz)
- 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-VSSOP
LP2966IMMX-1818 FAQ
1.How can I place an order for LP2966IMMX-1818 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2966IMMX-1818 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 LP2966IMMX-1818 reliable?
The price and inventory of LP2966IMMX-1818 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2966IMMX-1818 is usually 5 days.
3.What payment methods are accepted for LP2966IMMX-1818?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2966IMMX-1818 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2966IMMX-1818?
LP2966IMMX-1818 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2966IMMX-1818 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 LP2966IMMX-1818?
For technical support, including LP2966IMMX-1818 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2966IMMX-1818 requirements.
6.How does Aetrix verify that LP2966IMMX-1818 is sourced from the original manufacturer or authorized distributors?
All LP2966IMMX-1818 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 LP2966IMMX-1818 meets industry standards.
7.What is the process for return or replacement of LP2966IMMX-1818?
All LP2966IMMX-1818 units undergo pre-shipment inspection (PSI). If there is an issue with LP2966IMMX-1818, 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 LP2966IMMX-1818 part is unused and in its original packaging.
Return procedure for LP2966IMMX-1818:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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