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Texas Instruments LM3671QTL-1.8/NOPB
- Part No.:
- LM3671QTL-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-WFBGA, DSBGA
- Datasheet:
-
LM3671QTL-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 600MA 5DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
LM3671QTL-1.8/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, optimized for single Li-Ion battery input (2.7 V to 5.5 V) and delivering a fixed 1.8 V output. It features automatic PFM-PWM mode switching, 16 µA typical quiescent current in light-load PFM mode, internal soft start, and integrated PFET/NFET power switches with 380 mΩ/250 mΩ typical RDS(ON). It powers core logic rails in space-constrained portable electronics such as mobile phones and digital still cameras.
For engineers reviewing the LM3671QTL-1.8/NOPB datasheet, LM3671QTL-1.8/NOPB pinout, LM3671QTL-1.8/NOPB application, or LM3671QTL-1.8/NOPB equivalent, key selection considerations include its fixed 1.8 V output, 2 MHz switching frequency enabling compact 2.2 µH inductor use, shutdown current of 0.01 µA, thermal shutdown at 150°C, and compatibility with ceramic input/output capacitors as low as 4.7 µF and 10 µF respectively.
Technical Context
The LM3671QTL-1.8/NOPB implements voltage-mode PWM control with input-voltage feed-forward for stable line regulation, and transitions autonomously to hysteretic PFM mode below ~80 mA load to maintain high efficiency at ultra-low quiescent current. Its internal 0.5 V reference feeds a precision error amplifier that regulates output by modulating PFET on-time via a 2 MHz oscillator.
Operation relies on synchronous rectification using an internal NFET to replace the external Schottky diode, reducing conduction loss-especially critical at 1.8 V output where diode forward drop would consume >10% of output voltage. Protection includes cycle-by-cycle current limiting (1020 mA typical), thermal shutdown (150°C trip), undervoltage lockout, and soft-start with stepped current limit ramp (70 mA → 140 mA → 280 mA → 1020 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±4% over −40°C to +125°C; enables direct powering of 1.8 V I/O or core 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 and aging. |
| Max Load Current | 600 mA continuous; sufficient for baseband processors, camera ISPs, or RF transceivers in handheld devices. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temp); allows use of tiny 2.2 µH shielded inductors and minimizes audible noise. |
| Quiescent Current | 16 µA typical in PFM mode; extends battery runtime during standby or low-activity states in portable instruments. |
| Shutdown Current | 0.01 µA typical; reduces system-level leakage when host MCU disables EN pin during deep sleep. |
| RDS(ON) (PFET/NFET) | 380 mΩ / 250 mΩ at VIN = 3.6 V; enables >90% peak efficiency at 300 mA with 2.2 µH inductor and ceramic caps. |
Pinout & Package
LM3671QTL-1.8/NOPB uses a 6-pin USON (NKH) package, 2.00 mm × 2.00 mm nominal body size, with wettable flank leads for automated optical inspection. Thermal resistance is RθJA = 174.7°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to input filter capacitor (≥4.7 µF ceramic); must be ≥2.7 V before enabling to avoid UVLO activation. |
| SW | Switching node | Drives external 2.2 µH inductor; carries high di/dt square wave; requires tight layout to minimize EMI and ringing. |
| FB | Feedback input | Internally connected to 1.8 V divider; no external resistors needed-pin must be tied directly to VOUT for stability. |
| EN | Enable control | Digital input: <0.4 V = shutdown (0.01 µA IQ), >1 V = active; must not float-pull down with ≥1 MΩ if unused. |
| GND | Power ground | Primary return path for input cap, inductor, and output cap; requires low-impedance connection to minimize noise. |
| SGND | Signal ground | Separate ground pin for FB reference; must connect to GND at single point near IC to avoid feedback loop errors. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic PFM-PWM mode switching | Transitions at ~80 mA load without external control-maintains >85% efficiency from 1 mA to 600 mA. |
| Internal synchronous rectification | Eliminates external Schottky diode; reduces conduction loss by ~300 mV at 600 mA, improving thermal performance. |
| Integrated soft-start | Staged current limit ramp prevents inrush into 10 µF output caps; startup time is 275–400 µs depending on load. |
| Thermal and overload protection | Shuts down at 150°C junction temperature and limits peak switch current to 1020 mA-prevents damage during short-circuit. |
| Ultra-low shutdown current | 0.01 µA typical enables >10-year shelf life in battery-backed medical sensors or IoT edge nodes. |
Applications
| Mobile Phone Power Management | Digital Still Camera Core Rail |
|---|---|
Use Scenario: Powers 1.8 V I/O interface and memory subsystem in slim smartphone designs with single-cell Li-Ion battery. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.8 V from 3.6 V nominal battery rail; operates in PWM mode during call/data bursts and PFM during screen-off idle. Use Value: 2 MHz switching allows 2.2 µH inductor and 10 µF ceramic output cap-reducing solution footprint by 40% vs lower-frequency alternatives. |
Use Scenario: Supplies image signal processor (ISP) core voltage in compact digital cameras with rapid on/off cycling. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter activated only during photo capture; enters shutdown between shots to conserve battery. Use Value: 0.01 µA shutdown current extends usable battery life by >12 hours per charge in intermittent-use imaging applications. |
| Portable Medical Sensor Hub | Automotive Infotainment Display Logic |
Use Scenario: Provides stable 1.8 V supply to low-power microcontroller and analog front-end in wearable ECG monitors. IC Role / Device Role / Timing Role: Always-on power rail supporting real-time biosignal acquisition; maintains regulation across battery discharge from 4.2 V to 2.7 V. Use Value: 16 µA PFM quiescent current enables >7-day continuous operation on a 200 mAh coin cell-critical for clinical-grade wearables. |
Use Scenario: Generates 1.8 V logic rail for display timing controller (TCON) in automotive head-unit LCD modules. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified buck converter operating from 5 V pre-regulated rail in harsh under-hood environments. Use Value: Integrated thermal shutdown (150°C) and 125°C max junction rating ensure reliable operation in ambient temperatures up to +105°C. |
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 1.8 V, 600 mA, 3 MHz switching, 2.5 µA quiescent current in PFM mode; 5-pin WSON package (1.5 mm × 1.5 mm). | Higher frequency allows smaller inductor (1 µH), but lacks SGND pin-requires more careful PCB layout for feedback stability. | Preferred when board area is constrained and 3 MHz EMI profile is acceptable; verify layout robustness for 1.8 V accuracy under load transients. |
| MP2108DQ-LF-Z | Fixed 1.8 V, 600 mA, 1.5 MHz switching, 30 µA quiescent current; 6-pin QFN (2 mm × 2 mm) with exposed thermal pad. | Lower switching frequency increases inductor size (4.7 µH typical), but thermal pad improves power dissipation in high-ambient environments. | Preferred for industrial applications above 85°C ambient where thermal management outweighs size constraints. |
Compared with TPS62231DRYR and MP2108DQ-LF-Z, the LM3671QTL-1.8/NOPB offers superior light-load efficiency due to its 16 µA PFM IQ and dedicated SGND pin for enhanced feedback accuracy-making it optimal for battery-sensitive portable systems requiring long standby duration and precise 1.8 V regulation.
Availability
LM3671QTL-1.8/NOPB is available at Aetrix Electronics and suitable for mobile phone power management, digital still camera core rails, portable medical sensor hubs, automotive infotainment display logic, and handheld transaction terminals requiring stable component supply across production lifecycles.
Supply support for LM3671QTL-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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, personal electronics, and communications markets.
The LM3671 product line delivers highly integrated, small-footprint DC-DC converters for battery-powered portable devices-designed specifically to reduce external component count while maintaining high efficiency across wide load and input voltage ranges.
FAQ
What is the recommended input capacitor for LM3671QTL-1.8/NOPB?
The LM3671QTL-1.8/NOPB datasheet specifies a minimum 4.7 µF ceramic input capacitor placed close to the VIN and GND pins. TI recommends X5R or X7R dielectric types rated for ≥6.3 V to handle ripple current and maintain stability across temperature. Larger values (e.g., 10 µF) improve line transient response but are not required for basic operation.
Does LM3671QTL-1.8/NOPB require an external feedback resistor network?
No. The LM3671QTL-1.8/NOPB is a fixed-output variant with internal feedback divider set for 1.8 V. The FB pin is internally connected and must be tied directly to the VOUT net-no external resistors are permitted or needed. Adding external components to FB will disrupt regulation and cause output voltage error.
What is the maximum allowable inductor DCR for LM3671QTL-1.8/NOPB at 600 mA load?
At 600 mA load, the LM3671QTL-1.8/NOPB's total dropout is dominated by PFET RDS(ON) (380 mΩ typ) and inductor DCR. To maintain regulation, DCR should be ≤100 mΩ-TI's reference design uses a 2.2 µH inductor with 60 mΩ DCR. Higher DCR causes output droop and reduced efficiency, especially at high ambient temperatures.
How does the soft-start function operate on LM3671QTL-1.8/NOPB?
The LM3671QTL-1.8/NOPB implements hardware-based soft-start by stepping the internal current limit from 70 mA → 140 mA → 280 mA → 1020 mA during EN assertion. This occurs only when VIN ≥2.7 V first, preventing premature start-up. Typical rise time to 1.8 V is 275 µs (1 mA load) to 400 µs (300 mA load) with a 10 µF output capacitor.
Is LM3671QTL-1.8/NOPB qualified for automotive applications?
No. The LM3671QTL-1.8/NOPB is the commercial-grade version. For automotive use, TI offers the LM3671Q1 series (e.g., LM3671Q1TL-1.8/NOPB), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C ambient), undergoes additional stress testing, and features enhanced ESD ratings on corner pins. The 'Q' suffix denotes automotive qualification.
LM3671QTL-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-WFBGA, DSBGA
- 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):
- 1.8V
- 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:
- 5-DSBGA (1.41x1.08)
LM3671QTL-1.8/NOPB FAQ
1.How can I place an order for LM3671QTL-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671QTL-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 LM3671QTL-1.8/NOPB reliable?
The price and inventory of LM3671QTL-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 LM3671QTL-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM3671QTL-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671QTL-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671QTL-1.8/NOPB?
LM3671QTL-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671QTL-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 LM3671QTL-1.8/NOPB?
For technical support, including LM3671QTL-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671QTL-1.8/NOPB requirements.
6.How does Aetrix verify that LM3671QTL-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3671QTL-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 LM3671QTL-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM3671QTL-1.8/NOPB?
All LM3671QTL-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3671QTL-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 LM3671QTL-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM3671QTL-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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