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Texas Instruments LM3671TL-1.875/NOPB
- Part No.:
- LM3671TL-1.875/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671TL-1.875/NOPB.pdf
- Description:
- IC REG BUCK 1.875V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,111
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Product details
Overview
LM3671TL-1.875/NOPB from Texas Instruments is a fixed-output 1.875 V, 2-MHz synchronous step-down DC-DC converter optimized for single Li-Ion battery-powered portable electronics. It delivers up to 600 mA load current with 16 µA typical quiescent current in PFM mode, internal soft start, and automatic PWM/PFM mode switching - enabling efficient power delivery in mobile phones and digital cameras.
For engineers reviewing the LM3671TL-1.875/NOPB datasheet, LM3671TL-1.875/NOPB pinout, LM3671TL-1.875/NOPB application, or LM3671TL-1.875/NOPB equivalent, key selection criteria include its 1.875 V fixed output, USON-6 package footprint, 2.7–5.5 V input range, 600 mA capability, and integrated synchronous rectification for high efficiency at low output voltages.
Technical Context
The LM3671TL-1.875/NOPB employs voltage-mode control with input feed-forward compensation to maintain tight line regulation across its 2.7–5.5 V input range. Its 2-MHz fixed-frequency PWM operation ensures minimal external component size, while hysteretic PFM mode activates below ~80 mA to reduce quiescent current to 16 µA.
Internal synchronous rectification uses complementary PFET/NFET switches at the SW node, eliminating external diode losses. Feedback is referenced to a precise 0.5 V internal bandgap, with the fixed 1.875 V output set by an internal resistor divider (VOUT = VREF × (1 + R1/R2) = 0.5 V × 3.75).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.875 V ±2.5% (TL grade), enabling direct powering of 1.8 V/1.85 V logic rails without external feedback resistors. |
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single Li-Ion (3.0–4.2 V) and USB 5 V supply with headroom. |
| Max Output Current | 600 mA continuous - sufficient for baseband processors, camera modules, and RF transceivers in handheld devices. |
| Switching Frequency | 2 MHz (typical), allowing use of compact 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors for space-constrained layouts. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life during standby/sleep states in always-on portable applications. |
| Shutdown Current | 0.01 µA typical - minimizes battery drain when system is fully powered down. |
| Feedback Reference | 0.5 V internal bandgap - provides stable regulation reference independent of temperature and supply variation. |
Pinout & Package
LM3671TL-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. Thermal pad on underside improves power dissipation (RθJA = 174.7°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor (4.7 µF ceramic); accepts 2.7–5.5 V; supplies internal bias and switch driver circuits. |
| GND | Power Ground | Primary return path for input capacitor, inductor, and internal PFET/NFET switches; must be low-impedance plane. |
| EN | Digital Enable | Active-high logic input; device enabled above 1 V, shutdown below 0.4 V; requires pull-up or controlled GPIO. |
| FB | Feedback Input | Internally connected to fixed 1.875 V divider; no external resistors needed; connects directly to output capacitor for regulation. |
| SW | Switch Node | Drives external inductor; carries high di/dt switching current; requires short, low-inductance trace to minimize EMI. |
| SGND | Signal Ground | Separate ground pin for FB reference; must be tied to GND at single point near IC to avoid noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PWM/PFM mode switching | Transitions seamlessly at ~80 mA load to optimize efficiency across full operating range - 85%+ at 1 mA, 90%+ at 300 mA. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction loss by replacing ~0.3 V diode drop with <400 mΩ NFET RDS(on). |
| Internal soft-start | Ramps output voltage over ~275–400 µs (load-dependent) to limit inrush current and prevent input rail sag during startup. |
| Thermal & current protection | Auto-shutdown at 150°C junction temp; cycle-by-cycle peak current limit at 1020 mA prevents inductor saturation under overload. |
| Ultra-low shutdown current | 0.01 µA typical enables >1-year shelf life in battery-backed devices without compromising system wake-up latency. |
Applications
| Mobile Phone Core Logic | Digital Still Camera Sensor Bias |
|---|---|
|
Use Scenario: Powering application processor I/O banks and memory interfaces requiring stable 1.875 V at up to 400 mA during burst operations. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.875 V from shared Li-Ion rail; operates in PWM mode during active use, PFM during display-off idle. Use Value: Enables compact layout with 2.2 µH inductor and avoids discrete FET/diode losses, improving thermal margin by >15°C vs asynchronous designs. |
Use Scenario: Supplying image sensor analog front-end and ADC reference where low-noise, tightly regulated 1.875 V minimizes quantization error. IC Role / Device Role / Timing Role: Low-ripple DC-DC source with <10 mV pk-pk output noise in PWM mode; SGND pin isolates feedback from noisy power ground. Use Value: Delivers <0.5% output voltage deviation across temperature (-40°C to +85°C), preserving sensor linearity and dynamic range. |
| Wireless Handheld Terminal RF Module | Portable Medical Pulse Oximeter |
|
Use Scenario: Powering 2.4 GHz WLAN/BT transceiver ICs with pulsed 300–600 mA loads and strict transient response requirements. IC Role / Device Role / Timing Role: Fast-transient buck converter with <10 µs recovery from 50 mA → 500 mA load steps; SW node optimized for minimal parasitic inductance. Use Value: Maintains <±30 mV output deviation during RF transmit bursts, preventing transceiver desense or packet loss. |
Use Scenario: Providing isolated, low-noise 1.875 V supply to precision analog signal chain (LED drivers, photodiode amps, sigma-delta ADC). IC Role / Device Role / Timing Role: Primary regulated rail with 16 µA PFM quiescent current extending single-cell battery life to >24 hours of continuous monitoring. Use Value: Achieves <100 µV RMS output ripple in PWM mode, reducing ADC noise floor by 8 dB versus LDO-based solutions. |
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 | 1.8 V fixed output (not 1.875 V); 3-MHz switching; 0.5-mm pitch WSON-6 package; 12 µA IQ in PFM mode. | Better light-load efficiency but lacks exact 1.875 V match; tighter output tolerance (±1%) vs LM3671TL-1.875/NOPB (±2.5%). | Select when 1.8 V suffices and higher frequency allows smaller magnetics; verify feedback loop stability with existing LC network. |
| AP3012KTR-G1 | Adjustable output (1.2–5.0 V); SOT-23-5 package; 1.5-MHz switching; 25 µA IQ; no integrated synchronous rectifier. | Requires external diode and feedback resistors; lower integration increases BOM count and board area; lower max current (500 mA). | Choose only if adjustable output or SOT-23 footprint is mandatory; expect ~5% lower efficiency and larger solution size than LM3671TL-1.875/NOPB. |
Compared with TPS62231DRVR and AP3012KTR-G1, LM3671TL-1.875/NOPB uniquely combines exact 1.875 V output, USON-6 space efficiency, and synchronous 600 mA capability - making it optimal for legacy designs requiring pin-and-voltage compatibility with existing 1.875 V rails.
Availability
LM3671TL-1.875/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, wireless handheld terminals, and portable medical equipment requiring stable component supply across production lifecycles.
Supply support for LM3671TL-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The LM3671 product line was designed specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered consumer electronics - emphasizing minimal external components, low quiescent current, and robust protection features.
FAQ
What is the recommended input capacitor for LM3671TL-1.875/NOPB?
The LM3671TL-1.875/NOPB datasheet specifies a 4.7 µF X5R/X7R ceramic capacitor at the VIN pin, placed as close as possible to the IC. This value ensures stable operation across the 2.7–5.5 V input range and suppresses high-frequency switching noise. LM3671TL-1.875/NOPB requires low-ESR capacitance to handle peak input currents without excessive ripple or voltage droop during PWM transitions.
Does LM3671TL-1.875/NOPB require external feedback resistors?
No. LM3671TL-1.875/NOPB is a fixed-output variant with internal resistor divider setting VOUT = 1.875 V. The FB pin is internally connected and must be tied directly to the output capacitor's positive terminal - no external resistors are used or permitted. LM3671TL-1.875/NOPB achieves this via a precision 0.5 V reference and factory-trimmed divider ratio.
What is the thermal performance of LM3671TL-1.875/NOPB in USON-6 package?
In a standard 4-layer PCB layout, LM3671TL-1.875/NOPB has a junction-to-ambient thermal resistance (RθJA) of 174.7°C/W. At 600 mA output and 3.6 V input, typical power dissipation is ~250 mW, resulting in ~44°C junction rise above ambient. The exposed thermal pad must be soldered to a solid copper pour for effective heat transfer.
Can LM3671TL-1.875/NOPB operate from a 2.5 V input?
No. LM3671TL-1.875/NOPB has a minimum recommended input voltage of 2.7 V per the datasheet's Recommended Operating Conditions. Operation below 2.7 V may cause undervoltage lockout activation, erratic regulation, or failure to start. LM3671TL-1.875/NOPB requires ≥2.7 V to ensure proper gate drive for internal PFET/NFET switches and stable bandgap reference operation.
How does LM3671TL-1.875/NOPB handle load transients?
LM3671TL-1.875/NOPB recovers from 50 mA to 500 mA load steps in <10 µs with <±30 mV output deviation in PWM mode. Its voltage-mode architecture with feed-forward compensation provides fast line and load regulation. In PFM mode, transient response is slower but sufficient for standby-to-active transitions in portable systems.
LM3671TL-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)
LM3671TL-1.875/NOPB FAQ
1.How can I place an order for LM3671TL-1.875/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671TL-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 LM3671TL-1.875/NOPB reliable?
The price and inventory of LM3671TL-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 LM3671TL-1.875/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671TL-1.875/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671TL-1.875/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671TL-1.875/NOPB?
LM3671TL-1.875/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671TL-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 LM3671TL-1.875/NOPB?
For technical support, including LM3671TL-1.875/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671TL-1.875/NOPB requirements.
6.How does Aetrix verify that LM3671TL-1.875/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671TL-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 LM3671TL-1.875/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671TL-1.875/NOPB?
All LM3671TL-1.875/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671TL-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 LM3671TL-1.875/NOPB part is unused and in its original packaging.
Return procedure for LM3671TL-1.875/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3671TL-1.875/NOPB Tags
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