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Texas Instruments LP5900XR-1.8/NOPB
- Part No.:
- LP5900XR-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 4-XFBGA, DSBGA
- Datasheet:
-
LP5900XR-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 150MA 4DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,034
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Product details
Overview
LP5900XR-1.8/NOPB from Texas Instruments is a 150-mA ultra-low-noise LDO regulator designed for RF and analog circuits, delivering 1.8 V output with ±2% tolerance, 80 mV typical dropout, 6.5 μVRMS output noise, and 75 dB PSRR at 1 kHz. It operates from 2.5 V to 5.5 V input and requires only 0.47-μF ceramic input/output capacitors-no noise bypass capacitor needed.
For engineers reviewing the LP5900XR-1.8/NOPB datasheet, LP5900XR-1.8/NOPB pinout, LP5900XR-1.8/NOPB application, or LP5900XR-1.8/NOPB equivalent, key selection criteria include low-noise power delivery for sensitive RF front-ends, minimal external component count in space-constrained portable designs, thermal performance under 150 mA load, and enable-controlled power sequencing in battery-powered systems.
Technical Context
The LP5900XR-1.8/NOPB uses an innovative internal RC-filtered reference architecture to suppress reference noise before amplification, eliminating the need for an external noise-bypass capacitor. Its low-quiescent-current design (25 μA enabled, <1 μA disabled) integrates logic-controlled enable with 1-MΩ internal pull-down and defined VIH/VIL thresholds (1.2 V / 0.4 V).
Stability is guaranteed with 0.47-μF ceramic capacitors on both input and output, and the device maintains regulation down to zero load. Thermal shutdown activates at ~160°C with 20°C hysteresis, and dropout voltage remains stable across −40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% - ensures precise biasing for 1.8-V RF ICs and analog sensors without external feedback. |
| Max Output Current | 150 mA - supports moderate-power RF transceivers, ADCs, and PLLs in handheld devices. |
| Dropout Voltage | 80 mV typ. at 150 mA - enables operation from single-cell Li-ion (3.0 V min) while maintaining regulation down to 1.88 V input. |
| Output Noise | 6.5 μVRMS (10 Hz–100 kHz) - minimizes phase noise in VCOs and jitter in high-speed data converters. |
| PSRR | 75 dB at 1 kHz - rejects switching noise from DC/DC converters feeding the LDO input. |
| Quiescent Current | 25 μA (enabled), <1 μA (disabled) - extends battery life in always-on sensor nodes and standby modes. |
| Enable Thresholds | VIH = 1.2 V, VIL = 0.4 V - compatible with 1.8-V and 3.3-V GPIOs without level-shifting. |
Pinout & Package
LP5900XR-1.8/NOPB is packaged in a 4-pin DSBGA (YZR) with 1.108 mm × 1.083 mm body size and exposed thermal pad on bottom. The package is optimized for ultra-thin mobile applications and requires PCB thermal vias under the pad for reliable power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.5–5.5 V; requires 0.47-μF ceramic capacitor to GND within 1 cm for stability. |
| EN | Logic-enable input | Internally pulled down via 1-MΩ resistor; ≥1.2 V enables regulator, ≤0.4 V disables it with <1 μA IQ. |
| GND | Ground reference | Common return path for input, output, and enable; must connect to low-impedance analog ground plane. |
| OUT | Regulated output | Delivers stable 1.8 V; requires 0.47-μF ceramic capacitor to GND within 1 cm for transient response and stability. |
| Thermal Pad | Thermal conduction path | Exposed copper pad on package bottom; must be soldered to PCB copper area with ≥4 thermal vias to inner ground layers. |
Key Features
| Feature | Design Value |
|---|---|
| No external noise-bypass capacitor required | Internal RC-filtered reference reduces output noise to 6.5 μVRMS, saving board space and BOM cost in RF modules. |
| Stable with 0.47-μF ceramic capacitors | Enables use of smallest commercially available X7R/X5R MLCCs, reducing footprint vs. legacy LDOs requiring ≥2.2 μF. |
| Ultra-low quiescent current | 25 μA active IQ and <1 μA shutdown IQ extend battery runtime in IoT edge nodes and wearable sensors. |
| Logic-compatible enable with internal pull-down | Eliminates need for external pull-down resistor; simplifies GPIO interfacing and prevents floating-input startup faults. |
| Thermal shutdown with hysteresis | Shuts down at ~160°C and re-enables at ~140°C, preventing thermal runaway during sustained 150 mA loads in sealed enclosures. |
Applications
| Cellular Front-End Power | Wireless LAN Transceiver Bias |
|---|---|
Use Scenario: Powering RF power amplifier (PA) bias rails and low-noise amplifier (LNA) supplies in 4G LTE handsets. IC Role / Device Role / Timing Role: Ultra-low-noise 1.8-V LDO providing clean local supply to minimize PA spectral regrowth and LNA noise figure degradation. Use Value: 6.5 μVRMS noise and 75 dB PSRR prevent coupling of digital switching noise into RF signal paths, preserving ACLR and EVM performance. | Use Scenario: Supplying 1.8-V VDDIO and VDDA rails for dual-band Wi-Fi 5/6 transceivers in smartphones and tablets. IC Role / Device Role / Timing Role: Low-dropout regulator enabling direct connection to shared 3.3-V PMIC rail while maintaining tight 1.8-V regulation under dynamic TX/RX load steps. Use Value: 150 mA capability and 150 μs start-up time support fast wake-from-sleep transitions without brownout in IEEE 802.11ax power-save modes. |
| Portable Audio Codec Supply | Industrial Sensor Signal Chain |
Use Scenario: Providing analog supply to stereo audio codecs and DACs in Bluetooth headphones and smart speakers. IC Role / Device Role / Timing Role: Low-noise 1.8-V source for codec analog sections, decoupling them from noisy digital domains and switching regulators. Use Value: 6.5 μVRMS output noise directly translates to >105 dB SNR in 24-bit audio paths, meeting Hi-Res Audio certification requirements. | Use Scenario: Powering precision 1.8-V ADCs, op-amps, and MEMS sensor interfaces in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: Stable, low-IQ LDO ensuring accurate sensor readings across temperature and battery discharge cycles. Use Value: ±2% output tolerance and −40°C to 125°C operation guarantee consistent 16-bit+ measurement accuracy in harsh industrial environments. |
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 IQ (1.2 μA disabled), same 1.8 V output, but requires 1-μF output capacitor and has higher noise (12 μVRMS). | Better for ultra-low-power sleep modes; less suitable for RF-sensitive analog stages due to higher noise. | Choose when lowest shutdown IQ is critical and RF noise sensitivity is secondary. |
| MCP1700T-1802E/TT | 100 mA max output, 6 μVRMS noise, but only 60 dB PSRR at 1 kHz and no enable pin - fixed-on operation. | Suitable for simpler sensor nodes without sequencing needs; insufficient for 150 mA RF loads or high-PSRR filtering. | Choose for cost-sensitive, low-current applications where enable control and high PSRR are not required. |
Compared with TPL720F18-DBVR and MCP1700T-1802E/TT, LP5900XR-1.8/NOPB uniquely balances 150 mA drive, 6.5 μVRMS noise, 75 dB PSRR, and logic-enable functionality in a 1.1-mm² DSBGA-making it optimal for space-constrained, noise-sensitive RF/analog subsystems requiring full power management control.
Availability
LP5900XR-1.8/NOPB is available at Aetrix Electronics and suitable for cellular front-end power, wireless LAN transceiver bias, portable audio codec supply, and industrial sensor signal chain applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP5900XR-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 company specializing in analog, embedded processing, and silicon innovation for industrial, automotive, and communications markets.
The LP5900 product line delivers ultra-low-noise, low-IQ LDOs optimized for powering RF transceivers, analog signal chains, and precision sensors in portable and battery-operated equipment.
FAQ
What is the minimum input voltage required for LP5900XR-1.8/NOPB to regulate 1.8 V output?
The LP5900XR-1.8/NOPB requires a minimum input voltage of 2.5 V to operate, but to maintain regulation at full 150 mA load, VIN must be ≥ VOUT + VDO = 1.8 V + 0.08 V = 1.88 V. However, per datasheet Recommended Operating Conditions, VIN must be ≥2.5 V regardless of load to ensure internal circuitry functions correctly. Below 2.5 V, the device may not start or sustain regulation.
Does LP5900XR-1.8/NOPB require an external bypass capacitor for noise reduction?
No, LP5900XR-1.8/NOPB does not require an external noise-bypass capacitor. Its internal reference stage includes a first-order RC filter that reduces reference noise before amplification, achieving 6.5 μVRMS output noise with only 0.47-μF input and output ceramic capacitors-confirmed in TI's SNVS358R datasheet Section 7.3.3.
What package type and dimensions does LP5900XR-1.8/NOPB use?
LP5900XR-1.8/NOPB uses the YZR 4-pin DSBGA package with body dimensions of 1.108 mm × 1.083 mm (maximum) and an exposed thermal pad on the bottom. This ultra-compact, wafer-level chip-scale package is designed for thin mobile applications and requires PCB thermal vias under the pad for thermal reliability.
Can LP5900XR-1.8/NOPB operate with zero load current?
Yes, LP5900XR-1.8/NOPB remains stable and in regulation with zero load current. Section 7.3.1 of the datasheet explicitly states "No-Load Stability," and Electrical Characteristics confirm stable operation across IOUT = 0 mA to 150 mA, making it suitable for always-on bias rails in sensor and standby circuits.
What is the enable pin behavior and threshold voltage for LP5900XR-1.8/NOPB?
The EN pin of LP5900XR-1.8/NOPB has an internal 1-MΩ pull-down resistor to GND. It enables the regulator when voltage ≥1.2 V (VIH) and disables it when ≤0.4 V (VIL). When disabled, quiescent current drops below 1 μA. This logic-level compatibility allows direct interfacing with 1.8-V or 3.3-V microcontroller GPIOs without external components.
LP5900XR-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 4-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- 230 µA
- PSRR:
- 85dB ~ 40dB (100Hz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-DSBGA
LP5900XR-1.8/NOPB FAQ
1.How can I place an order for LP5900XR-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5900XR-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 LP5900XR-1.8/NOPB reliable?
The price and inventory of LP5900XR-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 LP5900XR-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP5900XR-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5900XR-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5900XR-1.8/NOPB?
LP5900XR-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5900XR-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 LP5900XR-1.8/NOPB?
For technical support, including LP5900XR-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5900XR-1.8/NOPB requirements.
6.How does Aetrix verify that LP5900XR-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5900XR-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 LP5900XR-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP5900XR-1.8/NOPB?
All LP5900XR-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5900XR-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 LP5900XR-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP5900XR-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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