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Texas Instruments LP3999ITLX-1.8/NOPB
- Part No.:
- LP3999ITLX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LP3999ITLX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:25,994
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Product details
Overview
LP3999ITLX-1.8/NOPB from Texas Instruments is a low-noise, 150mA fixed-output LDO voltage regulator in a 5-pin DSBGA package, designed for RF/analog power domains. It delivers a precise 1.8V ±75mV output with 60mV typical dropout at 150mA, 10µVrms output noise (10Hz–100kHz), and fast 140µs turn-on time - enabling stable biasing of sensitive analog/RF circuitry in portable wireless devices.
For engineers reviewing the LP3999ITLX-1.8/NOPB datasheet, LP3999ITLX-1.8/NOPB pinout, LP3999ITLX-1.8/NOPB application, or LP3999ITLX-1.8/NOPB equivalent, key selection criteria include its ceramic-capacitor stability (1µF COUT), logic-controlled enable (active-high, 0.9V VIH), thermal/short-circuit protection, and operation across −40°C to +125°C junction temperature.
Technical Context
The LP3999ITLX-1.8/NOPB employs a PMOS pass transistor architecture with internal bandgap reference and error amplifier, enabling ultra-low quiescent current (3nA in shutdown) and minimal dropout. Its CBYPASS pin connects directly to a high-impedance node in the reference circuit, requiring a 0.01µF capacitor to suppress noise without degrading transient response.
Stability is ensured with 1µF ceramic output capacitors (X7R/Y5V/Z5U, ESR 5–500mΩ) and no minimum load requirement. The device features active-high enable control, thermal shutdown at 160°C, and short-circuit current limiting at 450mA - all integrated within a 1.5mm × 1.5mm DSBGA package optimized for space-constrained portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±75mV (±4.2% tolerance); ensures accurate biasing for 1.8V I/O and core rails in RF transceivers and baseband ICs. |
| Max Output Current | 150mA guaranteed; supports moderate-power analog blocks (e.g., VCOs, ADC front-ends, RF amplifiers) without derating. |
| Dropout Voltage | 60mV typical at 150mA load; enables operation down to VIN = 1.86V, maximizing battery runtime in single-cell Li-ion systems. |
| Output Noise | 10µVrms (10Hz–100kHz); critical for preserving SNR in RF receivers, PLLs, and precision analog signal chains. |
| Enable Threshold | VIH = 0.9V, VIL = 0.4V; compatible with 1.8V/3.3V GPIOs and allows clean sequencing with digital baseband processors. |
| Thermal Protection | 160°C shutdown with 20°C hysteresis; prevents permanent damage during sustained overload or poor PCB thermal design. |
| Operating Temp | −40°C to +125°C junction range; qualified for automotive infotainment modules and industrial handhelds. |
Pinout & Package
LP3999ITLX-1.8/NOPB is housed in a 1.5mm × 1.5mm, 5-bump DSBGA package (TI package code YZR0005), with non-solder-mask-defined (NSMD) pads and SnAgCu ball finish. Mounting requires alignment ordinals and avoids direct sunlight exposure due to light sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (VEN) | Enable input | Active-high logic control: ≥0.9V enables regulation; ≤0.4V disables output and reduces IQ to 3nA. |
| B2 (GND) | Ground reference | Common return path for input, output, and bypass circuits; must connect to low-impedance analog ground plane. |
| C1 (VOUT) | Regulated output | Delivers 1.8V to load; requires 1µF ceramic capacitor (X7R recommended) placed within 1cm of pin. |
| C3 (VIN) | Input supply | Accepts 2.5–6.0V; requires 1µF input capacitor near pin to suppress source impedance and ensure stability. |
| A3 (CBYPASS) | Noise reduction node | Connects to bandgap reference; 0.01µF NPO/COG ceramic capacitor here reduces output noise without affecting transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 10µVrms over 10Hz–100kHz enables use in RF synthesizers and high-resolution ADC/DAC supplies without external filtering. |
| Ceramic-capacitor stability | Guaranteed stable with 1µF X7R/Y5V output capacitor (ESR 5–500mΩ), eliminating need for larger, costlier tantalum parts. |
| Fast turn-on time | 140µs to 95% of 1.8V output enables rapid power-up of RF sections during TDMA burst transmission. |
| Virtually zero shutdown current | 3nA typical quiescent current when disabled extends battery life in sleep-mode applications like Bluetooth LE peripherals. |
| Integrated protection | Thermal shutdown (160°C) and short-circuit current limit (450mA) eliminate need for external fault management circuitry. |
Applications
| GSM/CDMA Cellular Handsets | Bluetooth Audio Devices |
|---|---|
Use Scenario: Powering RF transceiver VCOs and IF amplifiers in dual-mode GSM/CDMA handsets operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise 1.8V LDO supplying critical analog bias rails, replacing noisier switching regulators to prevent phase noise degradation. Use Value: 10µVrms noise and 60mV dropout preserve EVM and adjacent channel leakage ratio (ACLR) while extending talk time. | Use Scenario: Supplying 1.8V digital I/O and analog audio codec sections in compact Bluetooth headsets and earbuds. IC Role / Device Role / Timing Role: Enable-controlled power rail for audio subsystems that must wake rapidly during voice call initiation. Use Value: 140µs turn-on time and 3nA shutdown current support low-latency audio streaming and multi-week standby battery life. |
| Wideband CDMA Baseband Processors | Handheld MP3 Players |
Use Scenario: Providing clean 1.8V supply to WCDMA baseband ASICs with high-speed serial interfaces (e.g., MIPI, LVDS). IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling high-frequency digital switching noise from sensitive analog PLLs and ADCs. Use Value: PSRR of 60dB at 1kHz rejects ripple from shared system power rails, preventing bit errors in high-data-rate modems. | Use Scenario: Powering flash memory controllers and audio DACs in battery-powered MP3 players with strict size constraints. IC Role / Device Role / Timing Role: Compact, low-profile LDO delivering regulated 1.8V from 3.0–4.2V battery input using minimal board area. Use Value: 1.5mm × 1.5mm DSBGA package and 1µF ceramic capacitor support <10mm² total solution footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F18-DBVR | Lower 25µVrms noise, 200mA output, but requires 2.2µF output capacitor and has higher 120µA quiescent current in active mode. | Better for ultra-low-noise RF synth supplies where 1.8V accuracy and 200mA headroom are critical. | Choose TPL720F18-DBVR if noise budget is tighter than 10µVrms and board space allows larger capacitor. |
| MCP1700T-1802E/MB | Higher 300mV dropout at 250mA, 17µVrms noise, SOT-23-5 package, and −40°C to +125°C rating - but lacks CBYPASS pin for noise optimization. | Suitable for cost-sensitive consumer audio where 1.8V tolerance ±2% suffices and layout simplicity outweighs ultra-low noise. | Choose MCP1700T-1802E/MB for legacy SMT lines supporting SOT-23 and where DSBGA assembly is unavailable. |
Compared with LP3999ITLX-1.8/NOPB, TPL720F18-DBVR offers lower noise but higher IQ and larger capacitor footprint, while MCP1700T-1802E/MB trades noise performance and package size for broader manufacturing compatibility and lower unit cost.
Availability
LP3999ITLX-1.8/NOPB is available at Aetrix Electronics and suitable for GSM/CDMA handsets, Bluetooth audio devices, wideband CDMA baseband processors, and handheld MP3 players requiring stable component supply with full lifecycle support.
Supply support for LP3999ITLX-1.8/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management ICs.
The LP3999 series belongs to TI's low-noise LDO portfolio, engineered specifically for RF/analog power integrity in portable wireless devices - emphasizing noise suppression, ceramic-capacitor compatibility, and minimal board-area solutions.
FAQ
What is the maximum input voltage rating for LP3999ITLX-1.8/NOPB?
The absolute maximum input voltage for LP3999ITLX-1.8/NOPB is 6.5V, but the recommended operating range is 2.5V to 6.0V per the datasheet. Exceeding 6.5V risks permanent damage to the internal PMOS pass element and bandgap reference circuitry. For reliable long-term operation in battery-powered systems, VIN should remain ≤6.0V, especially under hot ambient conditions where thermal stress compounds electrical overstress.
Does LP3999ITLX-1.8/NOPB require an external bypass capacitor on the CBYPASS pin?
Yes - LP3999ITLX-1.8/NOPB requires a 0.01µF ceramic capacitor (NPO or COG dielectric preferred) between the CBYPASS pin and GND. This capacitor directly stabilizes the internal bandgap reference node; omitting it increases output noise by up to 3× and may cause overshoot during startup. The datasheet explicitly states this capacitor is "strongly recommended" and confirms it does not degrade transient response - a unique advantage over many competing LDOs.
Can LP3999ITLX-1.8/NOPB operate with no load connected to VOUT?
Yes - LP3999ITLX-1.8/NOPB remains stable and maintains regulation with zero load current, as confirmed in the "No-Load Stability" section of the datasheet. This capability is essential for applications like CMOS RAM keep-alive circuits or standby power domains where the output may be disconnected or draw only nanoampere-level leakage. No minimum load resistor is required.
What is the thermal resistance (θJA) of LP3999ITLX-1.8/NOPB in its DSBGA package?
The junction-to-ambient thermal resistance (θJA) for LP3999ITLX-1.8/NOPB in the 5-bump DSBGA (YZR) package is 255°C/W, as specified in the Thermal Properties table. This value assumes standard JEDEC test conditions (JESD51-2); actual θJA in end equipment depends heavily on PCB copper area, via count, and airflow. For continuous 150mA operation at 1.8V output, power dissipation is ~60mW - resulting in ~15°C junction rise above ambient under typical layouts.
Is LP3999ITLX-1.8/NOPB compatible with 1.8V GPIO enable signals?
Yes - LP3999ITLX-1.8/NOPB is fully compatible with 1.8V logic enable signals. Its enable threshold is defined as VIH = 0.9V (minimum) and VIL = 0.4V (maximum), meaning a 1.8V GPIO output (typically 1.7–1.8V high) exceeds the VIH requirement by >2× margin. This ensures robust noise immunity and eliminates need for level-shifting circuitry when interfacing with 1.8V microcontrollers or baseband processors.
LP3999ITLX-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.1V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 200 µA
- PSRR:
- 60dB (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:
- 5-DSBGA (1.41x1.08)
LP3999ITLX-1.8/NOPB FAQ
1.How can I place an order for LP3999ITLX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3999ITLX-1.8/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 LP3999ITLX-1.8/NOPB reliable?
The price and inventory of LP3999ITLX-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3999ITLX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP3999ITLX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3999ITLX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3999ITLX-1.8/NOPB?
LP3999ITLX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3999ITLX-1.8/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 LP3999ITLX-1.8/NOPB?
For technical support, including LP3999ITLX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3999ITLX-1.8/NOPB requirements.
6.How does Aetrix verify that LP3999ITLX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3999ITLX-1.8/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 LP3999ITLX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP3999ITLX-1.8/NOPB?
All LP3999ITLX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3999ITLX-1.8/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 LP3999ITLX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP3999ITLX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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