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Texas Instruments LM3671TLX-1.875/NOPB
- Part No.:
- LM3671TLX-1.875/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TLX-1.875/NOPB.pdf
- Description:
- IC REG BUCK 1.875V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,567
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Product details
Overview
LM3671TLX-1.875/NOPB from Texas Instruments is a fixed-output 1.875 V, 600-mA synchronous step-down DC-DC converter in a 2.0 mm × 2.0 mm USON-6 package. It operates from 2.7 V to 5.5 V input, delivers 2 MHz fixed-frequency PWM switching with automatic PFM mode transition below ~80 mA, and integrates soft-start, thermal shutdown, and current limiting. It powers core logic rails in space-constrained portable devices such as MP3 players and digital still cameras.
For engineers reviewing the LM3671TLX-1.875/NOPB datasheet, LM3671TLX-1.875/NOPB pinout, LM3671TLX-1.875/NOPB application, or LM3671TLX-1.875/NOPB equivalent, key selection considerations include its 1.875 V fixed output, 16 µA typical quiescent current in PFM mode, 0.01 µA shutdown current, internal synchronous rectification, and compatibility with only three external components (2.2 µH inductor + two ceramic capacitors).
Technical Context
The LM3671TLX-1.875/NOPB uses voltage-mode control with input-voltage feed-forward to maintain tight line regulation across its 2.7–5.5 V input range. Its internal 0.5 V reference feeds a precision error amplifier that regulates output by modulating PFET on-time while maintaining 2 MHz (±0.4 MHz) oscillator frequency in PWM mode.
It implements dual-mode operation: above ~80 mA load, it runs in constant-frequency PWM with 1020 mA typical peak current limit; below that threshold, it transitions to hysteretic PFM mode-reducing switching frequency and quiescent current to 16 µA-while allowing output voltage to swing ±0.6% to ±1.7% around 1.875 V to preserve transient response headroom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.875 V ±2.5% (TL-grade accuracy), enabling direct powering of 1.8 V I/O or low-voltage core logic without external feedback resistors. |
| Max Output Current | 600 mA continuous, supporting moderate-power subsystems like camera ISPs or audio codecs without external current boosting. |
| Input Voltage Range | 2.7 V to 5.5 V, compatible with single Li-ion (3.0–4.2 V), USB 5 V, or regulated 3.3 V rails. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp), permitting use of compact 2.2 µH inductors and minimizing EMI in sensitive RF bands. |
| Quiescent Current | 16 µA typical in PFM mode, extending battery runtime in standby or low-activity states of portable instruments. |
| Shutdown Current | 0.01 µA typical, reducing system-level leakage during deep sleep or power-off sequences. |
| Internal FET RDS(ON) | PFET: 500 mΩ max; NFET: 400 mΩ max at 3.6 V, minimizing conduction loss and thermal rise under full load. |
Pinout & Package
LM3671TLX-1.875/NOPB is housed in a 2.00 mm × 2.00 mm, 0.5 mm pitch, 6-pin USON (NKH) package with wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply; must be ≥2.7 V before enabling to avoid UVLO activation. |
| SW | Switch Node | Drives external 2.2 µH inductor; carries high di/dt PWM waveform; requires tight layout to minimize EMI and ringing. |
| FB | Feedback Input | Internally connected to 1.875 V output divider; no external resistors needed; must tie directly to output capacitor for stability. |
| EN | Enable Control | Digital input: <0.4 V = shutdown (0.01 µA IQ), >1 V = active; must not float; compatible with 1.8 V/3.3 V GPIO. |
| GND | Power Ground | Main return path for input/output currents; requires low-impedance connection to PCB ground plane beneath IC. |
| SGND | Signal Ground | Separate feedback ground pin; ties internally to FB reference; must connect near FB capacitor to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM-PWM mode switching | Eliminates manual mode control; maintains >85% efficiency from 1 mA to 600 mA load without external circuitry. |
| Integrated synchronous rectification | Replaces external Schottky diode; reduces conduction loss by ~30% vs. asynchronous design at 1.875 V output. |
| Internal soft-start (4-step ramp) | Limits inrush current during power-up; prevents input rail droop and stabilizes output within 275–400 µs depending on load/capacitance. |
| Thermal shutdown with hysteresis | Disables switching at 150°C junction temperature and re-enables at 130°C, preventing permanent damage during sustained overload. |
| Only three external components required | Reduces BOM count and board area: one 2.2 µH shielded inductor + two X5R/X7R ceramic caps (CIN = 4.7 µF, COUT = 10 µF). |
Applications
| Mobile Phone Baseband Power | MP3 Player Audio Codec Supply |
|---|---|
Use Scenario: Powers baseband processor I/O banks requiring stable 1.875 V from a shared Li-ion battery rail. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.875 V with fast transient response to handle burst-mode data processing. Use Value: Maintains 1.875 V ±25 mV under 100 mA load steps with <5 µs recovery, avoiding logic errors during packet transmission. |
Use Scenario: Supplies clean 1.875 V to stereo audio DAC/ADC in battery-powered MP3 players. IC Role / Device Role / Timing Role: Low-noise DC-DC source with PFM mode enabling >90% efficiency at 5 mA playback current. Use Value: Extends battery life by 18% versus LDO-based solution due to 16 µA PFM quiescent current and synchronous topology. |
| Digital Still Camera Image Sensor Bias | Portable Medical Pulse Oximeter Core Logic |
Use Scenario: Provides 1.875 V bias to CMOS image sensor interface circuitry in compact DSC modules. IC Role / Device Role / Timing Role: Compact, low-EMI power stage placed adjacent to sensor to minimize routing noise. Use Value: 2 MHz switching allows small 2.2 µH inductor placement within 3 mm² footprint, meeting strict mechanical constraints. |
Use Scenario: Powers microcontroller and analog front-end in handheld pulse oximeters operating from coin-cell or Li-ion. IC Role / Device Role / Timing Role: High-reliability regulator with thermal shutdown and undervoltage lockout for safety-critical monitoring. Use Value: 0.01 µA shutdown current enables multi-week standby without battery replacement; AEC-Q100–qualified variants available. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | Fixed 1.8 V output (not 1.875 V); 1.8–5.5 V input; 600 mA; 3.6 MHz switching; 17 µA IQ in PFM. | Better suited for systems requiring exact 1.8 V logic rails; higher frequency demands smaller inductors but increases EMI filtering complexity. | Select if 1.8 V matches system voltage requirements and board layout supports 3.6 MHz EMI mitigation. |
| AP63202WU-18 | Fixed 1.8 V output; 2.5–5.5 V input; 2 A capability; 2.2 MHz; 25 µA IQ; WLCSP-6 package (1.5 × 1.5 mm). | Higher current headroom and smaller footprint, but lacks TL-grade FB accuracy (±3% vs ±2.5%) and has no automotive-qualified variant. | Choose when scaling to 2 A loads or ultra-dense layouts is required, and 1.8 V tolerance suffices. |
Compared with TPS62231DRVR and AP63202WU-18, LM3671TLX-1.875/NOPB uniquely provides 1.875 V output with ±2.5% TL-grade accuracy in a thermally robust USON-6 package, making it optimal for applications where precise 1.875 V rails-such as certain FPGA I/O banks or legacy ASIC cores-are mandatory.
Availability
LM3671TLX-1.875/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and portable medical equipment requiring stable component supply, long-term lifecycle support, and consistent TL-grade parametric performance.
Supply support for LM3671TLX-1.875/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 and embedded processing technologies, with decades of expertise in power management ICs for portable and industrial applications.
The LM3671 product line was designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, low-quiescent-current DC-DC conversion with minimal external components.
FAQ
What is the output voltage tolerance of LM3671TLX-1.875/NOPB?
The LM3671TLX-1.875/NOPB features TL-grade output accuracy of ±2.5% over temperature and load, meaning its 1.875 V nominal output remains within 1.828 V to 1.922 V across –40°C to +125°C ambient and 0–600 mA load. This tighter tolerance than standard MF-grade (±4%) ensures reliable operation of voltage-sensitive logic interfaces without external trimming.
Can LM3671TLX-1.875/NOPB operate from a single alkaline cell?
No, LM3671TLX-1.875/NOPB requires a minimum input voltage of 2.7 V per its recommended operating conditions. A fresh alkaline cell starts at ~1.6 V and drops rapidly; even two cells in series (3.2 V initial) fall below 2.7 V within minutes under load. The device is optimized for single Li-ion (3.0–4.2 V), USB 5 V, or regulated 3.3 V supplies-not primary batteries.
Does LM3671TLX-1.875/NOPB require an external feedback resistor network?
No, LM3671TLX-1.875/NOPB is a fixed-output variant with internal feedback divider configured for 1.875 V. The FB pin connects directly to the output capacitor and must not be loaded with external resistors. Using external resistors would disrupt regulation and void the specified ±2.5% accuracy-only adjustable versions (e.g., LM3671MF-ADJ) support external dividers.
What thermal protection does LM3671TLX-1.875/NOPB provide?
LM3671TLX-1.875/NOPB includes internal thermal shutdown that disables switching when junction temperature reaches 150°C (typical) and re-enables at 130°C (typical). This hysteresis prevents cycling during overload. Combined with its USON-6 package's 174.7°C/W θJA, the device sustains 600 mA output at +85°C ambient on a 4-layer board without external heatsinking.
How does LM3671TLX-1.875/NOPB minimize EMI in RF-sensitive designs?
LM3671TLX-1.875/NOPB minimizes EMI through 2 MHz fixed-frequency operation-placing switching harmonics above most cellular and Wi-Fi bands-and integrated synchronous rectification, which eliminates reverse-recovery noise from external diodes. Layout best practices (short SW loop, solid GND plane, proper decoupling) further suppress radiated emissions per FCC Class B limits.
LM3671TLX-1.875/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.875V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-DSBGA (1.41x1.08)
LM3671TLX-1.875/NOPB FAQ
1.How can I place an order for LM3671TLX-1.875/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TLX-1.875/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 LM3671TLX-1.875/NOPB reliable?
The price and inventory of LM3671TLX-1.875/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671TLX-1.875/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TLX-1.875/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TLX-1.875/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TLX-1.875/NOPB?
LM3671TLX-1.875/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TLX-1.875/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 LM3671TLX-1.875/NOPB?
For technical support, including LM3671TLX-1.875/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TLX-1.875/NOPB requirements.
6.How does Aetrix verify that LM3671TLX-1.875/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TLX-1.875/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 LM3671TLX-1.875/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TLX-1.875/NOPB?
All LM3671TLX-1.875/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TLX-1.875/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 LM3671TLX-1.875/NOPB part is unused and in its original packaging.
Return procedure for LM3671TLX-1.875/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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