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Texas Instruments LM3670MF-1.6
- Part No.:
- LM3670MF-1.6
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3670MF-1.6.pdf
- Description:
- IC REG BUCK 1.6V 350MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,249
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Product details
Overview
LM3670MF-1.6 from Texas Instruments is a fixed-output 1.6 V synchronous step-down DC-DC converter in SOT-23-5 package, optimized for ultralow-voltage portable systems powered by single Li-Ion or triple NiMH/NiCd cells. It delivers up to 350 mA load current with 15 µA typical quiescent current, 1 MHz fixed-frequency PWM switching, and automatic PFM/PWM mode transition - enabling high efficiency (94% at 10–100 mA) in mobile phones and handheld instrumentation.
For engineers reviewing the LM3670MF-1.6 datasheet, LM3670MF-1.6 pinout, LM3670MF-1.6 application, or LM3670MF-1.6 equivalent, key selection criteria include its 2.5–5.5 V input range, 1.6 V ±4% output tolerance over full load/temperature, internal synchronous rectification, 0.1 µA shutdown current, and minimal external component count (1 inductor + 2 ceramic caps).
Technical Context
The LM3670MF-1.6 implements voltage-mode control with input feed-forward compensation, enabling tight line regulation (0.26%/V) and load regulation (0.0014%/mA). Its integrated PFET/NFET power stage features 360–690 mΩ PMOS and 250–660 mΩ NMOS RDS(on), supporting low dropout operation down to 100% duty cycle when VIN approaches VOUT.
It operates across three functional modes: fixed-frequency 1-MHz PWM (70–350 mA), hysteretic PFM (light-load, IQ = 15 µA typ), and shutdown (0.1 µA typ). Mode transitions are fully autonomous - no external control required - and include soft-start (400 µs typical), undervoltage lockout (2.4 V), and cycle-by-cycle current limiting (620 mA typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.6 V ±4% over 0–350 mA load and −40°C to +125°C junction temperature |
| Input voltage range | 2.5 V to 5.5 V - supports direct operation from single Li-Ion (2.7–4.2 V) or 3-cell NiMH (3.0–4.5 V) |
| Max output current | 350 mA - sustained delivery with thermal derating above 85°C ambient |
| Quiescent current | 15 µA typical in PFM mode - extends battery life in standby without external bias circuitry |
| Switching frequency | 1 MHz typical in PWM mode - enables use of compact 4.7–10 µH inductors and low-ESR ceramic capacitors |
| Shutdown current | 0.1 µA typical - reduces system-level leakage during deep sleep or power-off states |
| Efficiency | 94% typical at 10–100 mA (VIN = 3.6 V, VOUT = 1.6 V) - enabled by internal synchronous rectification |
Pinout & Package
LM3670MF-1.6 is housed in a 5-pin SOT-23 package (2.90 mm × 1.60 mm body size) with exposed pad not electrically connected. The package supports standard reflow soldering and provides adequate thermal dissipation (RθJA = 163.3°C/W) for continuous 350 mA operation at ≤65°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.5–5.5 V supply; requires local 4.7 µF ceramic decoupling capacitor to suppress high-frequency switching noise |
| GND (Pin 2) | Ground reference | Primary return path for input/output currents and internal control circuitry; must be low-impedance connection to PCB ground plane |
| EN (Pin 3) | Digital enable | Active-high logic input (VIH ≥1.3 V, VIL ≤0.4 V); pulls low to enter 0.1 µA shutdown state; must not float |
| FB (Pin 4) | Feedback node | Internally tied to 1.6 V reference; connects directly to output capacitor for fixed-output configuration - no external resistor divider needed |
| SW (Pin 5) | Switching node | Drives external inductor; carries high di/dt current pulses; requires short, low-inductance trace to minimize EMI and voltage overshoot |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves efficiency by 5–10% vs. asynchronous buck at 1.6 V output |
| Automatic PFM/PWM mode switching | Seamlessly transitions between 15 µA light-load PFM and 1-MHz PWM without external control or timing components |
| 100% duty cycle low-dropout operation | Maintains regulated 1.6 V output even when VIN drops to ~1.7 V (e.g., end-of-discharge Li-Ion), extending usable battery runtime |
| Integrated soft-start | 400 µs typical startup time with 10 µF output cap - prevents inrush current spikes that could destabilize shared input rails |
| Current overload protection | Cycle-by-cycle peak-current limit at 620 mA typical - protects internal FETs and external inductor during short-circuit or overload events |
Applications
| Mobile Phone Core Logic Power | Handheld Medical Instrument Sensor Bias |
|---|---|
Use Scenario: Powers ARM Cortex-M core, SRAM, and peripheral I/O in slim smartphone designs where board space and battery life are critical. IC Role / Device Role / Timing Role: Primary 1.6 V step-down regulator delivering stable core voltage under dynamic load transients (0–300 mA steps). Use Value: Delivers 94% efficiency at 100 mA while consuming only 15 µA in idle - directly extending talk time by >8% versus legacy LDO solutions. | Use Scenario: Supplies precision analog front-end (AFE) and low-noise ADC in portable blood glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Fixed 1.6 V rail generator with <20 mV output ripple and fast transient response (<50 µs recovery from 50 mA load step). Use Value: Enables 16-bit ADC accuracy by maintaining <0.1% output deviation during sensor excitation pulses - verified per TI SNVS250F Figure 4. |
| PDA Application Processor I/O Supply | Battery-Powered Industrial Data Logger |
Use Scenario: Provides I/O voltage for application processor (e.g., i.MX6ULL) in ruggedized PDA used in field service and logistics. IC Role / Device Role / Timing Role: High-efficiency 1.6 V buck converter operating across wide temperature (−40°C to +85°C) and input (2.7–4.2 V) ranges. Use Value: Maintains ±4% output regulation over full temperature and load range - eliminating need for post-regulation LDO and saving 12 mm² PCB area. | Use Scenario: Powers microcontroller, RF transceiver, and flash memory in long-life environmental monitoring nodes deployed for 5+ years on two AA cells. IC Role / Device Role / Timing Role: Primary DC-DC regulator enabling ultra-low-power sleep mode (0.1 µA shutdown) and rapid wake-up (<1 ms). Use Value: Reduces average system current from 25 µA to 18 µA in duty-cycled operation - extending battery life from 3.2 to 4.7 years per TI application data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 1.6 V fixed output, 300 mA max, 2.05–6.0 V input, 3.6 MHz switching, 3.5 µA IQ | Higher switching frequency enables smaller inductor (1.0 µH), but lower max current limits use in 350 mA designs | Select when board space is constrained and load current ≤300 mA; verify thermal performance with 0.5 W dissipation limit |
| AP63202WU-16 | 1.6 V fixed output, 2 A max, 2.5–5.5 V input, 1.5 MHz switching, 22 µA IQ | Higher current capability and integrated soft-start, but larger 8-pin WLCSP package (1.5 mm × 1.5 mm) and higher BOM cost | Select when future-proofing for higher loads or tighter layout constraints; requires requalification of EMI filtering |
Compared with TPS62231DRVR and AP63202WU-16, the LM3670MF-1.6 offers optimal balance of 350 mA capability, ultra-low 15 µA PFM IQ, proven SOT-23 manufacturability, and minimal external component count - making it ideal for cost-sensitive, battery-constrained portable designs where 300–350 mA peak load is confirmed.
Availability
LM3670MF-1.6 is available at Aetrix Electronics and suitable for mobile phones, handheld medical instruments, PDAs, and battery-powered industrial data loggers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3670MF-1.6 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 power management ICs for industrial, automotive, and consumer markets.
The LM3670 product line was designed specifically for ultralow-voltage portable electronics - delivering high-efficiency, small-footprint DC-DC conversion from single-cell batteries with minimal external components and autonomous power-mode management.
FAQ
What is the recommended inductor value for LM3670MF-1.6 in a typical application?
A 4.7 µH or 10 µH shielded surface-mount inductor with ≥800 mA saturation current rating is recommended for LM3670MF-1.6. TI's SNVS250F datasheet specifies 10 µH as optimal for minimizing output ripple and ensuring stability across 0–350 mA loads. Inductor DCR must be <0.3 Ω to maintain >90% efficiency at full load. Common selections include Coilcraft DO1608C-103 and Vishay IDC2512NB100M.
Does LM3670MF-1.6 require an external feedback resistor network?
No, LM3670MF-1.6 does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to a precision 0.5 V reference and trimmed to deliver exactly 1.6 V at the output. The FB pin connects directly to the output capacitor's positive terminal in standard layout - no resistor divider or compensation components are needed, reducing BOM count and layout complexity.
What is the maximum allowable input voltage for LM3670MF-1.6?
The absolute maximum input voltage for LM3670MF-1.6 is 6 V, but the recommended operating range is 2.5 V to 5.5 V per TI SNVS250F Section 6.3. Exceeding 5.5 V risks violating safe operating area limits and may trigger internal protection circuits. For reliable long-term operation, VIN should remain within 2.5–5.5 V - compatible with single Li-Ion (2.7–4.2 V) and 3-cell NiMH (3.0–4.5 V) sources.
How does LM3670MF-1.6 handle load transients?
LM3670MF-1.6 maintains output regulation within ±20 mV for 0–300 mA load steps (per TI SNVS250F Figure 11), recovering in <50 µs. This performance stems from its voltage-mode control architecture with input feed-forward, 1 MHz PWM bandwidth, and internal error amplifier compensation. Transient response is further enhanced by using low-ESR ceramic output capacitors (10 µF minimum) placed close to the SW and GND pins.
Is LM3670MF-1.6 RoHS compliant and lead-free?
Yes, LM3670MF-1.6 is RoHS compliant and lead-free. Per Texas Instruments' official packaging information (SNVS250F Section 12), the SOT-23 (DBV) package uses lead-free matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. All shipped units comply with EU Directive 2011/65/EU and are compatible with standard Pb-free reflow profiles.
LM3670MF-1.6 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.6V
- Voltage - Output (Max):
- -
- Current - Output:
- 350mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM3670MF-1.6 FAQ
1.How can I place an order for LM3670MF-1.6 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3670MF-1.6 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 LM3670MF-1.6 reliable?
The price and inventory of LM3670MF-1.6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3670MF-1.6 is usually 5 days.
3.What payment methods are accepted for LM3670MF-1.6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3670MF-1.6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3670MF-1.6?
LM3670MF-1.6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3670MF-1.6 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 LM3670MF-1.6?
For technical support, including LM3670MF-1.6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3670MF-1.6 requirements.
6.How does Aetrix verify that LM3670MF-1.6 is sourced from the original manufacturer or authorized distributors?
All LM3670MF-1.6 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 LM3670MF-1.6 meets industry standards.
7.What is the process for return or replacement of LM3670MF-1.6?
All LM3670MF-1.6 units undergo pre-shipment inspection (PSI). If there is an issue with LM3670MF-1.6, 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 LM3670MF-1.6 part is unused and in its original packaging.
Return procedure for LM3670MF-1.6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3670MF-1.6 Tags
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