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Texas Instruments LM3671QMF-1.2/NOPB
- Part No.:
- LM3671QMF-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671QMF-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,345
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Product details
Overview
LM3671QMF-1.2/NOPB from Texas Instruments is a 2-MHz, 600-mA synchronous step-down DC-DC converter in a 6-pin USON (2.0 mm × 2.0 mm) package, delivering a fixed 1.2 V output from 2.7–5.5 V input. It features 16 µA typical quiescent current, automatic PFM-PWM mode switching, internal soft start, and thermal/overcurrent protection-designed for space-constrained portable electronics powered by single Li-Ion cells.
For engineers reviewing the LM3671QMF-1.2/NOPB datasheet, LM3671QMF-1.2/NOPB pinout, LM3671QMF-1.2/NOPB application, or LM3671QMF-1.2/NOPB equivalent, key selection considerations include its fixed 1.2 V output, 2 MHz switching frequency enabling ultra-small external components (2.2 µH inductor + two ceramic caps), automotive-grade AEC-Q100 qualification (Grade 1), and integrated synchronous rectification for >90% efficiency at mid-load.
Technical Context
The LM3671QMF-1.2/NOPB implements voltage-mode PWM control with input-voltage feed-forward to maintain stable regulation across 2.7–5.5 V input. Its internal 0.5 V reference and fixed-resistor feedback network set the precise 1.2 V output without external dividers.
It operates in three distinct functional modes: PWM (≥80 mA load, 2 MHz fixed frequency), PFM (light load, <80 mA, variable frequency, 16 µA IQ), and shutdown (0.01 µA ISHDN). Mode transitions are fully automatic and hysteresis-controlled, eliminating external mode-select circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% over −40°C to +125°C ambient - enables direct powering of 1.2 V core rails without trimming. |
| Input Voltage Range | 2.7 V to 5.5 V - supports full discharge curve of single Li-Ion (3.0–4.2 V) plus margin for USB or backup rails. |
| Max Output Current | 600 mA continuous - sufficient for ARM Cortex-M4/M7 cores, LPDDR2/3 I/O, and RF transceivers in handheld devices. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp) - allows use of 2.2 µH shielded inductors <2.5 mm² footprint and 10 µF ceramic output cap. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life in always-on sensor or standby states of portable medical and IoT devices. |
| Shutdown Current | 0.01 µA typical - reduces system leakage during deep sleep, critical for multi-year battery operation. |
| Thermal Protection | Engages at TJ ≈ 150°C, disengages at TJ ≈ 130°C - prevents permanent damage during transient overload or poor PCB thermal design. |
Pinout & Package
LM3671QMF-1.2/NOPB uses a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm × 0.55 mm (nominal), optimized for high-density portable PCB layouts with exposed thermal pad for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Connects to input filter capacitor; accepts 2.7–5.5 V; must be decoupled within 2 mm of pin to suppress switching noise. |
| GND (Pin 2) | Power ground | Main return path for high-frequency switch current; ties directly to thermal pad and input/output capacitor grounds. |
| EN (Pin 3) | Digital enable | Active-high logic input; device enabled when ≥1 V, disabled when ≤0.4 V; must not float - tie to VIN or microcontroller GPIO. |
| FB (Pin 4) | Feedback input | Internally connected to fixed 1.2 V divider; no external resistors needed - simplifies layout and eliminates resistor tolerance error. |
| SW (Pin 5) | Switch node | Drives external inductor; carries high di/dt square wave - requires short, low-inductance trace and adjacent ground pour. |
| SGND (Pin 6) | Signal ground | Separate analog ground for FB pin; connects internally to GND but routed separately on PCB to avoid noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and improving efficiency by 8–12% at 100–300 mA loads. |
| Automatic PFM-PWM transition | No external control required; seamless shift at ~80 mA load ensures optimal efficiency across full operating range. |
| Internal soft-start | Ramps current limit in 4 steps (70/140/280/1020 mA) to limit inrush; achieves 400 µs startup time with 10 µF COUT and 300 mA load. |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - suitable for automotive infotainment, ADAS camera modules, and under-hood telematics. |
| Three-component solution | Requires only one 2.2 µH inductor and two ceramic capacitors (CIN = 4.7 µF, COUT = 10 µF) - minimizes BOM count and board area. |
Applications
| Mobile Phone Core Power | Automotive Camera Module |
|---|---|
Use Scenario: Powering application processor core voltage (e.g., Qualcomm Snapdragon S4, TI OMAP4) requiring stable 1.2 V at up to 500 mA. IC Role / Device Role / Timing Role: Primary buck regulator supplying CPU core rail; regulates via internal 0.5 V reference and fixed FB network. Use Value: 2 MHz switching avoids AM radio band interference; 16 µA PFM IQ extends talk-time by >15% versus 500 kHz alternatives. |
Use Scenario: Supplying image sensor and ISP in rear-view or surround-view cameras mounted in vehicle exterior housings. IC Role / Device Role / Timing Role: System power IC delivering 1.2 V to CIS and video processing ASIC under wide temperature (-40°C to +105°C). Use Value: AEC-Q100 Grade 1 rating ensures reliability in thermally aggressive environments; thermal shutdown prevents field failure during summer parking. |
| Portable Medical Monitor | Wireless Handheld Terminal |
Use Scenario: Providing regulated 1.2 V to low-power microcontroller (e.g., STM32L4) and analog front-end in battery-operated ECG/SpO₂ devices. IC Role / Device Role / Timing Role: Main system regulator managing dynamic load steps from sensor sampling to Bluetooth LE transmission bursts. Use Value: Automatic PFM-PWM mode switching maintains >85% efficiency from 10 µA idle to 400 mA transmit peak - maximizes battery runtime per charge. |
Use Scenario: Powering secure payment terminal SoC (e.g., NXP i.MX RT1050) with 1.2 V core and 3.3 V I/O rails in retail and logistics applications. IC Role / Device Role / Timing Role: Core voltage source supporting fast wake-from-sleep response (<100 µs) and burst-mode processing for NFC/EMV transactions. Use Value: Internal soft-start prevents brownout during cold boot; 0.01 µA shutdown current enables multi-month shelf life without battery drain. |
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 |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.2 V, 600 mA, 3 MHz, 2.5–6.5 V input, 2.0 mm × 2.0 mm WSON-6 - higher switching frequency but wider input range and no AEC-Q100 rating. | Targeted at industrial and consumer portables; lacks automotive qualification and has higher minimum input voltage (2.5 V vs. 2.7 V). | Select when 3 MHz operation is required for tighter EMI filtering or when input may dip below 2.7 V - verify thermal performance at 125°C ambient. |
| MP2108DJ-LF-Z | Fixed 1.2 V, 600 mA, 2 MHz, 2.5–5.5 V input, 2.0 mm × 2.0 mm TSOT23-6 - similar specs but non-automotive grade, lower IQ (25 µA vs. 16 µA), no integrated soft-start. | Suitable for cost-sensitive consumer electronics where AEC-Q100 and ultra-low IQ are not mandatory. | Prefer for non-automotive designs needing lowest BOM cost; confirm external soft-start circuit is added if inrush control is critical. |
Compared with TPS62231DRYR and MP2108DJ-LF-Z, LM3671QMF-1.2/NOPB uniquely combines AEC-Q100 Grade 1 qualification, 16 µA PFM IQ, and internal soft-start in a 2.0 mm × 2.0 mm USON package - making it the only drop-in solution for automotive camera modules and safety-critical portable medical devices requiring guaranteed thermal robustness and minimal external components.
Availability
LM3671QMF-1.2/NOPB is available at Aetrix Electronics and suitable for mobile phone core power, automotive camera modules, portable medical monitors, wireless handheld terminals, and industrial IoT edge nodes requiring stable component supply, long-lifecycle support, and automotive-grade reliability.
Supply support for LM3671QMF-1.2/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies for industrial, automotive, and personal electronics markets.
LM3671QMF-1.2/NOPB belongs to TI's high-efficiency, ultra-small-footprint DC-DC converter product line, designed specifically for battery-powered portable systems requiring minimal external components, low quiescent current, and automotive-grade reliability.
FAQ
What is the recommended input capacitor for LM3671QMF-1.2/NOPB?
The LM3671QMF-1.2/NOPB datasheet specifies a 4.7 µF X5R/X7R ceramic capacitor placed within 2 mm of the VIN and GND pins. This value provides adequate high-frequency decoupling for the 2 MHz switching frequency and limits input ripple to <30 mVpp under 600 mA load. Larger values (e.g., 10 µF) improve transient response but offer diminishing returns beyond 4.7 µF due to ESL constraints.
Does LM3671QMF-1.2/NOPB require an external feedback resistor network?
No, LM3671QMF-1.2/NOPB does not require an external feedback resistor network. It integrates a precision internal resistor divider calibrated to deliver a fixed 1.2 V output referenced to its 0.5 V internal bandgap. The FB pin is internally connected and must be left unconnected externally - unlike adjustable versions such as LM3671MF-ADJ.
What is the thermal resistance (RθJA) of LM3671QMF-1.2/NOPB in its USON package?
The LM3671QMF-1.2/NOPB in the 6-pin USON (NKH) package has a junction-to-ambient thermal resistance (RθJA) of 174.7°C/W on a standard 4-layer PCB per JEDEC JESD51-7. This value assumes 1 in² copper pour under the thermal pad and 2 oz copper layers - actual RθJA improves to ~110°C/W with enhanced thermal vias and larger ground planes.
Can LM3671QMF-1.2/NOPB operate from a 2.5 V input supply?
No, LM3671QMF-1.2/NOPB cannot reliably operate from a 2.5 V input. Its absolute minimum input voltage is 2.7 V per the Recommended Operating Conditions table. At 2.5 V, the internal PFET RDSON and dropout losses prevent regulation of the 1.2 V output, causing output collapse under load. Operation below 2.7 V risks undervoltage lockout activation and unstable PFM behavior.
How does the soft-start function work in LM3671QMF-1.2/NOPB?
The LM3671QMF-1.2/NOPB implements hardware-based soft-start by ramping its internal current limit in four discrete steps: 70 mA → 140 mA → 280 mA → 1020 mA (typical). This occurs only when EN transitions high after VIN reaches ≥2.7 V. The sequence limits inrush current into the output capacitor, preventing input rail sag and ensuring controlled voltage ramp-up - typical startup time is 275 µs (1 mA load) to 400 µs (300 mA load) with 10 µF COUT.
LM3671QMF-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM3671QMF-1.2/NOPB FAQ
1.How can I place an order for LM3671QMF-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671QMF-1.2/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 LM3671QMF-1.2/NOPB reliable?
The price and inventory of LM3671QMF-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671QMF-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671QMF-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671QMF-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671QMF-1.2/NOPB?
LM3671QMF-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671QMF-1.2/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 LM3671QMF-1.2/NOPB?
For technical support, including LM3671QMF-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671QMF-1.2/NOPB requirements.
6.How does Aetrix verify that LM3671QMF-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671QMF-1.2/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 LM3671QMF-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671QMF-1.2/NOPB?
All LM3671QMF-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671QMF-1.2/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 LM3671QMF-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM3671QMF-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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