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Texas Instruments LM3671MF-1.6/NOPB
- Part No.:
- LM3671MF-1.6/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-1.6/NOPB.pdf
- Description:
- IC REG BUCK 1.6V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:800
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Product details
Overview
LM3671MF-1.6/NOPB from Texas Instruments is a fixed-output 1.6 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, internal soft start, and automatic PFM-PWM mode switching - used in mobile phones and digital still cameras for efficient core voltage regulation.
For engineers reviewing the LM3671MF-1.6/NOPB datasheet, LM3671MF-1.6/NOPB pinout, LM3671MF-1.6/NOPB application, or LM3671MF-1.6/NOPB equivalent, key selection criteria include input voltage range (2.7 V to 5.5 V), fixed 1.6 V output accuracy (±4%), thermal shutdown at 150°C, and USON-6 package compatibility with space-constrained PCB layouts.
Technical Context
The LM3671MF-1.6/NOPB employs voltage-mode PWM control with input voltage feed-forward to maintain stable regulation across line and load variations. Its internal 0.5 V reference feeds an error amplifier that compares FB voltage against threshold, modulating PFET on-time to regulate output.
It integrates a 380 mΩ PFET and 250 mΩ NFET for synchronous rectification, enabling high efficiency at low output voltages. Mode transitions between PWM (≥80 mA load) and PFM (<80 mA) are fully autonomous, with hysteretic PFM comparators controlling output ripple band (±0.6% to ±1.7% around nominal).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.6 V ±4% - ensures stable core supply for 1.6 V–1.8 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 cell (3.0 V–4.2 V) plus margin for transient spikes. |
| Max Load Current | 600 mA - sufficient for baseband processors or camera ISPs in handheld devices. |
| Switching Frequency | 2 MHz typical - enables use of compact 2.2 µH inductors and 4.7 µF/10 µF ceramic capacitors. |
| Quiescent Current | 16 µA typical in PFM mode - extends battery life during standby or light-load operation. |
| Shutdown Current | 0.01 µA typical - minimizes leakage when system is powered off. |
| Thermal Shutdown | 150°C typical activation - protects IC and PCB during overload or poor heatsinking conditions. |
Pinout & Package
LM3671MF-1.6/NOPB is packaged in a 2.00 mm × 2.00 mm USON-6 (NKH) package with wettable flanks, optimized for automated optical inspection and high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply - must be decoupled locally to suppress switching noise. |
| GND | Power Ground | Primary return path for input and output currents; requires low-impedance connection to PCB ground plane. |
| EN | Digital Enable | Active-high logic input; device enabled above 1 V, disabled below 0.4 V - must not float; pull-down recommended. |
| FB | Feedback Input | Internally connected to 1.6 V output divider; no external resistors required - tied directly to VOUT for fixed-version regulation. |
| SW | Switch Node | Drives external inductor; carries high di/dt square wave - requires short, wide trace and tight loop with GND and VIN caps. |
| SGND | Signal Ground | Separate analog ground for FB reference; must connect to main GND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by >10% at 1.6 V/300 mA. |
| Automatic PFM-PWM Transition | Seamlessly shifts modes at ~80 mA load; maintains >85% efficiency from 1 mA to 600 mA without manual control. |
| Integrated Soft Start | Ramps current limit in 4 steps (70/140/280/1020 mA); prevents inrush into 10 µF output cap - startup time <400 µs at 300 mA. |
| Current Limit Protection | 1020 mA typical open-loop peak switch current limit - prevents damage during short-circuit or heavy transient loads. |
| Thermal & UVLO Protection | Shuts down at 150°C junction temp and restarts at 130°C; disables below 2.7 V VIN to prevent unstable regulation. |
Applications
| Mobile Phone Power Rail | Digital Still Camera Core Supply |
|---|---|
Use Scenario: Powers baseband processor or RF transceiver requiring stable 1.6 V at up to 400 mA during call or data transmission. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.6 V from single Li-Ion cell; operates in PWM mode under active load, switches to PFM during idle screen. Use Value: 16 µA quiescent current extends standby time; 2 MHz switching avoids AM radio band interference. | Use Scenario: Supplies image signal processor (ISP) and sensor interface in compact digital cameras with tight board area constraints. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter providing low-noise 1.6 V rail; uses USON-6 package to minimize footprint alongside 2.2 µH inductor and 10 µF ceramic output cap. Use Value: Internal soft start prevents voltage droop during camera power-up; thermal shutdown protects during extended video capture. |
| Portable Medical Sensor Module | Handheld Transaction Terminal |
Use Scenario: Powers low-power biosensor ASIC and BLE radio in wearable health monitors operating from coin-cell–compatible Li-Ion batteries. IC Role / Device Role / Timing Role: Efficient step-down regulator maintaining 1.6 V output across 3.0–4.2 V battery discharge; enters PFM mode during sensor sleep cycles. Use Value: 0.01 µA shutdown current preserves battery over multi-week deployments; small USON-6 footprint fits sub-10 cm² PCBs. | Use Scenario: Delivers 1.6 V to secure element and display driver in EMV-compliant payment terminals with frequent on/off cycling. IC Role / Device Role / Timing Role: Always-on buck converter with EN-controlled sequencing; provides fast start-up (<400 µs) and precise output for cryptographic ICs. Use Value: ±4% output tolerance meets ISO/IEC 7816-3 voltage requirements; internal current limiting prevents fault propagation during card insertion events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 1.6 V output, 3-MHz switching, 400-mA max load, 17-µA IQ, WSON-6 package (2.0 × 2.0 mm) | Lower max current and higher frequency - suitable for lighter loads where faster transient response is prioritized over peak power. | Select when board layout already uses 3-MHz-compatible magnetics and load rarely exceeds 400 mA. |
| AP63202WU-16 | Fixed 1.6 V output, 2-MHz switching, 600-mA max load, 22-µA IQ, WLCSP-6 package (1.5 × 1.5 mm) | Smaller WLCSP footprint but lower thermal performance (RθJA = 190°C/W vs 174.7°C/W) - requires careful thermal management at full load. | Select for ultra-compact designs where board area is more critical than thermal headroom at 600 mA. |
Compared with TPS62231DRYR and AP63202WU-16, LM3671MF-1.6/NOPB offers the best balance of 600-mA capability, 16-µA quiescent current, and proven USON-6 thermal performance - making it preferred for sustained moderate-load applications in consumer portables.
Availability
LM3671MF-1.6/NOPB is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and handheld transaction terminals requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LM3671MF-1.6/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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer markets.
The LM3671 product line delivers highly integrated, low-quiescent-current DC-DC buck converters for space- and battery-constrained portable electronics - emphasizing minimal external components, robust protection, and seamless light-load efficiency.
FAQ
What is the recommended input capacitor for LM3671MF-1.6/NOPB?
The LM3671MF-1.6/NOPB datasheet specifies a 4.7 µF ceramic input capacitor placed close to the VIN and GND pins. This value suppresses high-frequency switching noise and maintains stability across the 2.7 V–5.5 V input range. X5R or X7R dielectrics with 6.3 V or higher rating are recommended; placement within 2 mm of the USON-6 package is critical for EMI control. LM3671MF-1.6/NOPB performance degrades if capacitance falls below 3.3 µF or ESR exceeds 10 mΩ.
Does LM3671MF-1.6/NOPB require external feedback resistors?
No, LM3671MF-1.6/NOPB is a fixed-output variant with internal resistor divider set to 1.6 V - the FB pin connects directly to the output capacitor with no external components. Unlike the adjustable LM3671-ADJ version, LM3671MF-1.6/NOPB eliminates resistor matching errors and saves PCB area. The internal reference is trimmed to ±4% over temperature, and FB pin bias current is <100 nA, ensuring negligible loading effect on VOUT.
What is the thermal resistance (RθJA) of LM3671MF-1.6/NOPB in its USON-6 package?
The LM3671MF-1.6/NOPB in the NKH (USON-6) package has a junction-to-ambient thermal resistance of 174.7°C/W on a standard 4-layer PCB per JEDEC JESD51-7. This value assumes 1-in² copper pad with 2 oz Cu and 6 thermal vias under the exposed pad. At 600 mA load and 3.6 V input, junction temperature rise is approximately 65°C above ambient - well within the –40°C to +125°C operating range. LM3671MF-1.6/NOPB includes thermal shutdown at 150°C to prevent damage.
Can LM3671MF-1.6/NOPB operate from a 2.5 V input?
No, LM3671MF-1.6/NOPB has a minimum recommended input voltage of 2.7 V per the datasheet's Recommended Operating Conditions table. Below 2.7 V, undervoltage lockout (UVLO) disables regulation, and output voltage becomes uncontrolled. At 2.6 V input, LM3671MF-1.6/NOPB may enter dropout or oscillate unpredictably. For systems requiring operation down to 2.5 V, consider the LM3671MF-1.5/NOPB (1.5 V output) or verify actual behavior with TI's WEBENCH® simulation using exact load and thermal conditions.
How does LM3671MF-1.6/NOPB handle load transients?
LM3671MF-1.6/NOPB responds to load transients with <10 µs delay in PWM mode and <50 µs in PFM mode, per Figure 19–24 in the datasheet. A 10 µF output capacitor limits voltage deviation to ±30 mV for 100 mA → 400 mA steps. The internal error amplifier and feed-forward compensation provide stable closed-loop response without external compensation. LM3671MF-1.6/NOPB's PFM mode intentionally allows ±0.6%–±1.7% output ripple to maximize light-load efficiency - this is intentional, not instability.
LM3671MF-1.6/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):
- 1.6V
- 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:
- SOT-23-5
LM3671MF-1.6/NOPB FAQ
1.How can I place an order for LM3671MF-1.6/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-1.6/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 LM3671MF-1.6/NOPB reliable?
The price and inventory of LM3671MF-1.6/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671MF-1.6/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671MF-1.6/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-1.6/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-1.6/NOPB?
LM3671MF-1.6/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-1.6/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 LM3671MF-1.6/NOPB?
For technical support, including LM3671MF-1.6/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-1.6/NOPB requirements.
6.How does Aetrix verify that LM3671MF-1.6/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671MF-1.6/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 LM3671MF-1.6/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671MF-1.6/NOPB?
All LM3671MF-1.6/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-1.6/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 LM3671MF-1.6/NOPB part is unused and in its original packaging.
Return procedure for LM3671MF-1.6/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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