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Texas Instruments LM3671MF-1.2
- Part No.:
- LM3671MF-1.2
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3671MF-1.2.pdf
- Description:
- IC REG BUCK 1.2V 600MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
LM3671MF-1.2 from Texas Instruments is a fixed-output 1.2 V, 2-MHz synchronous step-down DC-DC converter optimized for single Li-Ion battery input (2.7 V to 5.5 V), delivering up to 600 mA load current with 16 µA typical quiescent current and internal soft-start. It powers core logic rails in space-constrained portable electronics such as mobile phones and digital cameras.
For engineers reviewing the LM3671MF-1.2 datasheet, LM3671MF-1.2 pinout, LM3671MF-1.2 application, or LM3671MF-1.2 equivalent, key selection criteria include output voltage accuracy (±4% over temperature), integrated PFET/NFET synchronous rectification, automatic PFM-PWM mode switching, thermal shutdown protection, and compatibility with only three external components: one 2.2-µH inductor and two ceramic capacitors.
Technical Context
The LM3671MF-1.2 uses voltage-mode PWM control with input-voltage feed-forward to maintain tight line regulation across its 2.7–5.5 V input range. Its 2-MHz fixed switching frequency enables compact passive component selection and reduces EMI concerns in RF-sensitive applications.
It implements intelligent light-load management via hysteretic PFM mode, reducing quiescent current to 16 µA while maintaining output regulation within ±0.6% to ±1.7% of nominal during transient recovery. Internal synchronous rectification-using a 380 mΩ PFET and 250 mΩ NFET-eliminates external diode losses and sustains >90% efficiency at 300 mA with VIN = 3.6 V and VOUT = 1.2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4% over –40°C to +125°C ambient; eliminates need for 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 system rail variations. |
| Max Output Current | 600 mA continuous; sufficient for powering ARM Cortex-M cores, LPDDR I/O, or camera sensor interfaces. |
| Switching Frequency | 2 MHz typical (1.6–2.6 MHz over temperature); enables use of 2.2-µH inductors <2 mm × 2 mm footprint. |
| Quiescent Current | 16 µA typical in PFM mode; extends battery runtime in standby or low-activity states (e.g., display-off). |
| Shutdown Current | 0.01 µA typical; critical for zero-power retention in always-on subsystems like RTC or wake-on-LAN circuits. |
| Internal FET RDS(ON) | PFET: 380 mΩ, NFET: 250 mΩ at VIN = 3.6 V; enables high-efficiency operation without external MOSFETs. |
Pinout & Package
LM3671MF-1.2 is packaged in a 6-pin USON (NKH) package measuring 2.00 mm × 2.00 mm, with wettable flank leads for automated optical inspection. The package supports high thermal performance (RθJA = 174.7°C/W on 4-layer board) and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Connects to input filter capacitor; accepts 2.7–5.5 V supply; internal UVLO disables operation below 2.7 V. |
| GND | Power Ground | Primary return path for input and output currents; must be low-impedance connection to minimize noise coupling. |
| EN | Digital Enable | Active-high logic input; device enabled when ≥1 V, shutdown when ≤0.4 V; internal pull-down prevents floating state. |
| FB | Feedback Input | Internally connected to 1.2 V reference divider; no external resistors required for fixed-output version. |
| SW | Switch Node | Drives external inductor; connects internally to PFET drain and NFET source; requires low-ESR ceramic capacitor at node. |
| SGND | Signal Ground | Separate ground for FB reference; must be tied to power GND at single point near IC to avoid feedback error. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing BOM count and improving efficiency by 8–12% at light loads. |
| Automatic PFM-PWM Mode Switching | Seamlessly transitions at ~80 mA load threshold; maintains >85% efficiency from 1 mA to 600 mA without manual control. |
| Internal Soft-Start | Ramps switch current limit in 4 steps (70/140/280/1020 mA); limits inrush current into 10-µF output cap to <1 A peak. |
| Thermal Shutdown Protection | Engages at 150°C junction temperature and releases at 130°C; prevents permanent damage during sustained overload. |
| Current Limit Protection | 1020 mA open-loop peak switch current limit; protects inductor and IC during short-circuit or startup overload. |
Applications
| Mobile Phone Core Rail | Portable Medical Sensor Power |
|---|---|
Use Scenario: Supplying 1.2 V to application processor cores (e.g., Qualcomm Snapdragon LDO-bypassed domains) from a 3.7 V Li-Ion battery. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise DC power with fast transient response to dynamic CPU load changes. Use Value: Delivers 600 mA at >92% efficiency while maintaining ±1.5% output deviation during 100 mA → 500 mA load steps, minimizing thermal stress on PCB. |
Use Scenario: Powering ultra-low-power biosensor analog front-ends (e.g., ECG/PPG signal chains) in handheld diagnostic devices. IC Role / Device Role / Timing Role: Efficient, low-quiescent power source enabling multi-day battery life in intermittent-sampling modes. Use Value: Draws only 16 µA in PFM mode during 95% sleep time, extending CR2032 coin-cell life beyond 12 months at 1-sample/sec duty cycle. |
| Digital Still Camera Image Sensor | Wireless Home-Automation MCU Rail |
Use Scenario: Generating 1.2 V for CMOS image sensor digital logic and interface circuitry (MIPI D-PHY) in compact camera modules. IC Role / Device Role / Timing Role: Compact, high-frequency buck converter minimizing board area while supporting burst-mode sensor readout. Use Value: 2-MHz operation allows 2.2-µH inductor placement adjacent to sensor IC, reducing loop area and radiated emissions below CISPR-22 Class B limits. |
Use Scenario: Supplying 1.2 V to Zigbee/Thread SoCs (e.g., Silicon Labs EFR32) in battery-powered smart switches and sensors. IC Role / Device Role / Timing Role: Always-on power stage enabling sub-100 ns wake-up from deep sleep to transmit encrypted telemetry packets. Use Value: 0.01 µA shutdown current ensures >10-year shelf life for sealed units; EN pin allows host MCU to gate power during firmware updates. |
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 output; 3-MHz switching frequency; 25 µA IQ; 400 mA max load; 5-pin WSON package. | Higher frequency enables smaller inductors but lower max current; less suitable for sustained 500+ mA loads. | Select when board space is more constrained than current capability, and thermal budget permits higher RθJA. |
| AP63202WU-7 | Adjustable 0.6–5.5 V output; 2-MHz switching; 22 µA IQ; 2 A max load; 8-pin WDFN package. | Requires external feedback resistors; higher current rating adds cost and layout complexity for 1.2 V/600 mA use cases. | Choose only if future design flexibility (e.g., multiple output voltages) justifies added BOM and layout overhead. |
Compared with TPS62231DRYR and AP63202WU-7, the LM3671MF-1.2 delivers optimal balance of fixed 1.2 V accuracy, 600 mA capability, ultra-low 16 µA quiescent current, and minimal external component count-making it the most direct fit for cost- and size-sensitive portable applications requiring no output voltage adjustment.
Availability
LM3671MF-1.2 is available at Aetrix Electronics and suitable for mobile phone power management, portable medical instrumentation, digital camera sensor rails, and wireless home-automation nodes requiring stable component supply across multi-year production cycles.
Supply support for LM3671MF-1.2 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, and personal electronics markets.
The LM3671MF-1.2 belongs to TI's portable power management portfolio, engineered specifically for high-efficiency, low-noise, space-constrained DC-DC conversion in battery-powered consumer devices operating from single-cell Li-Ion sources.
FAQ
What is the recommended input capacitor for LM3671MF-1.2?
The LM3671MF-1.2 datasheet specifies a minimum 4.7 µF X5R/X7R ceramic input capacitor placed as close as possible to the VIN and GND pins. A 10 µF capacitor is recommended for improved line transient response and reduced input ripple under 600 mA load steps. The capacitor must have ≤100 mΩ ESL and be rated for ≥6.3 V DC.
Does LM3671MF-1.2 require an external feedback resistor network?
No, the LM3671MF-1.2 is a fixed-output variant with internal resistor divider set to 1.2 V. The FB pin is internally connected to the reference node and must be directly tied to the output capacitor's VOUT node-no external resistors are needed or permitted. Using external resistors would disrupt regulation accuracy and void the ±4% output tolerance guarantee.
Can LM3671MF-1.2 operate with a 2.5 V input supply?
Yes, LM3671MF-1.2 supports input voltages down to 2.7 V per absolute specifications, but operation at 2.5 V violates the recommended operating condition and triggers undervoltage lockout (UVLO). Below 2.7 V, the device disables switching and enters shutdown mode to prevent unstable regulation or excessive dropout-so 2.5 V is not a functional input voltage for LM3671MF-1.2.
What is the thermal shutdown behavior of LM3671MF-1.2?
The LM3671MF-1.2 activates thermal shutdown at approximately 150°C junction temperature and remains latched off until the die cools to ~130°C. During shutdown, the SW pin floats, FB is disconnected from internal reference, and quiescent current drops to 0.01 µA. Recovery is automatic and does not require cycling EN or VIN-once TJ falls below 130°C, normal regulation resumes within 100 µs.
How does LM3671MF-1.2 handle load transients from 10 mA to 500 mA?
The LM3671MF-1.2 responds to a 10 mA → 500 mA load step in PWM mode with <15 µs output voltage recovery time and ±30 mV undershoot (measured at 10 µF COUT). This performance is enabled by its 2-MHz switching frequency, internal error amplifier compensation, and synchronous rectifier's low RDS(ON), ensuring stable core voltage for processors during burst-mode execution.
LM3671MF-1.2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 1.2V
- 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-1.2 FAQ
1.How can I place an order for LM3671MF-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3671MF-1.2 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-1.2 reliable?
The price and inventory of LM3671MF-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3671MF-1.2 is usually 5 days.
3.What payment methods are accepted for LM3671MF-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3671MF-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3671MF-1.2?
LM3671MF-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3671MF-1.2 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-1.2?
For technical support, including LM3671MF-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3671MF-1.2 requirements.
6.How does Aetrix verify that LM3671MF-1.2 is sourced from the original manufacturer or authorized distributors?
All LM3671MF-1.2 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-1.2 meets industry standards.
7.What is the process for return or replacement of LM3671MF-1.2?
All LM3671MF-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3671MF-1.2, 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-1.2 part is unused and in its original packaging.
Return procedure for LM3671MF-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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