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Texas Instruments LM3670MF-1.2
- Part No.:
- LM3670MF-1.2
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3670MF-1.2.pdf
- Description:
- IC REG BUCK 1.2V 350MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,184
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Product details
Overview
LM3670MF-1.2 from Texas Instruments is a fixed-output 1.2 V synchronous step-down DC-DC converter optimized for ultralow-voltage portable systems powered by single Li-Ion or three-cell NiMH/NiCd batteries. It delivers up to 350 mA load current, operates from 2.5 V to 5.5 V input, features 1-MHz PWM switching, 15-µA quiescent current in PFM mode, and internal soft start - enabling compact power rails in mobile phones and handheld instrumentation.
For engineers reviewing the LM3670MF-1.2 datasheet, LM3670MF-1.2 pinout, LM3670MF-1.2 application, or LM3670MF-1.2 equivalent, key selection criteria include its 1.2 V fixed output tolerance (±4.5% over 0–150 mA), 100% duty-cycle low-dropout capability, SOT-23-5 package footprint, and automatic PFM/PWM mode transition for battery life optimization in light-load standby states.
Technical Context
The LM3670MF-1.2 implements voltage-mode control with input voltage feed-forward to maintain stable regulation across line and load variations. Its integrated PFET/NFET synchronous rectifier eliminates external diode losses, achieving 90–95% efficiency at 1–100 mA loads.
Operation spans three distinct modes: fixed-frequency 1-MHz PWM (70–350 mA), hysteretic PFM (sub-70 mA, 15 µA IQ), and shutdown (<0.1 µA). Undervoltage lockout (2.4 V) and cycle-by-cycle current limiting (750 mA peak) ensure robustness during brownout or overload events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±4.5% over 0–150 mA load; supports stable core logic or I/O rail in battery-powered SoC subsystems. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single Li-Ion (2.7–4.2 V) or triple NiMH (3.0–4.5 V) battery stacks without external pre-regulation. |
| Max Load Current | 350 mA - sufficient for powering DSPs, RF transceivers, or display drivers in space-constrained handheld devices. |
| Switching Frequency | 1 MHz typical - enables use of small 4.7–10 µH inductors and ceramic capacitors, minimizing PCB area and EMI filtering complexity. |
| Quiescent Current | 15 µA typical in PFM mode - extends battery runtime during system idle or deep-sleep states in portable electronics. |
| Shutdown Current | 0.1 µA typical - ensures negligible battery drain when disabled via EN pin, critical for always-on sensor nodes. |
| Efficiency | 94% at 10 mA / 3.6 V input - reduces thermal load and improves energy utilization in thermally sensitive enclosures. |
Pinout & Package
The LM3670MF-1.2 is housed in a 5-pin SOT-23 package (2.90 mm × 1.60 mm body size), optimized for high-density portable PCB layouts with minimal thermal mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 2.5–5.5 V supply; must be decoupled with ≥4.7 µF ceramic capacitor close to pin to suppress switching noise and support peak PFET current. |
| GND (Pin 2) | Ground reference | Primary return path for PFET, NFET, and control circuitry; requires low-impedance connection to power plane for stability and EMI control. |
| EN (Pin 3) | Digital enable | Active-high logic input (VIH ≥1.3 V, VIL ≤0.4 V); pulling low disables regulator and reduces supply current to 0.1 µA. |
| FB (Pin 4) | Feedback node | Internally connected to 0.5 V reference; for fixed-output variants like LM3670MF-1.2, this pin is internally tied to output and not externally accessible. |
| SW (Pin 5) | Switching node | Connects to inductor; carries high di/dt current pulses (up to 750 mA peak); requires short, wide trace and ground pour clearance to minimize radiation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated PFET/NFET replaces external Schottky diode, eliminating ~0.3 V forward drop and enabling >90% efficiency at low output voltages. |
| Automatic PFM/PWM mode switching | Seamlessly transitions between high-efficiency PFM (15 µA IQ) and low-noise PWM (1 MHz) based on real-time load demand - no external control required. |
| 100% duty-cycle operation | PFET remains fully on when VIN approaches VOUT + dropout, sustaining regulated 1.2 V output down to ~1.4 V input - critical for end-of-battery-life operation. |
| Internal soft start | Controls inrush current during startup; achieves full 1.2 V output in ~400 µs with 10 µF COUT and 350 mA load - prevents input rail sag and system reset. |
| Current overload protection | Cycle-by-cycle peak-current limiting trips at 750 mA (max), safeguarding internal switches and external inductor during short-circuit or heavy transient events. |
Applications
| Mobile Phone Core Power | Handheld Instrumentation Rail |
|---|---|
Use Scenario: Powering ARM Cortex-M4 microcontroller core and SRAM in a GSM-enabled handheld meter. IC Role / Device Role / Timing Role: Primary 1.2 V buck regulator supplying digital core logic; operates in PFM during measurement standby, PWM during active ADC sampling and wireless transmission. Use Value: Delivers 350 mA peak during RF burst while maintaining <15 µA quiescent draw in sleep - extending 1200 mAh Li-Ion battery life to >12 months in field-deployed units. | Use Scenario: Generating stable 1.2 V supply for precision analog front-end (AFE) and low-noise op-amps in portable oscilloscope probe interface. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with 1-MHz switching; synchronized via external clock to avoid beat frequencies with ADC sampling clock. Use Value: Achieves <10 mVpp output ripple with 10 µF X5R COUT and shielded 10 µH inductor - meeting SNR requirements for 16-bit analog signal chain without additional LDO post-regulation. |
| PDA Application Processor I/O | Battery-Powered Sensor Node |
Use Scenario: Supplying 1.2 V I/O domain for application processor in legacy PDA with multi-voltage rail architecture. IC Role / Device Role / Timing Role: Secondary buck converter feeding GPIO, SDIO, and camera interface; enabled only during peripheral activity via EN pin control. Use Value: Enables selective power gating: 0.1 µA shutdown current eliminates leakage when peripherals are inactive, reducing total system standby power by 42% versus always-on solution. | Use Scenario: Ultra-low-power 1.2 V rail for MEMS accelerometer, BLE SoC, and EEPROM in coin-cell–powered predictive maintenance sensor. IC Role / Device Role / Timing Role: Primary regulator operating continuously in PFM mode; responds to wake-up interrupts with <500 µs output stabilization via internal soft-start ramp. Use Value: Supports 10-year battery life on CR2032 (225 mAh) by combining 15 µA PFM IQ, 100% duty-cycle dropout, and <0.1 µA shutdown - validated at −40°C to +85°C ambient. |
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 |
|---|---|---|---|
| TLC59202RTJR | Fixed 1.2 V output, 300 mA max, 2.7–5.5 V input, 25 µA IQ - lacks PFM/PWM auto-switching and synchronous rectification. | Lower efficiency (85% @10 mA), higher dropout - suitable only for non-critical, low-duty-cycle applications. | Select if cost sensitivity outweighs efficiency and battery life requirements; verify thermal derating at 350 mA. |
| TPS62231DRYR | Fixed 1.2 V output, 400 mA max, 2.05–6.0 V input, 17 µA IQ, 3.4 MHz switching - uses different control architecture (D-CAP2) and smaller 2-mm² DSBGA package. | Higher frequency enables smaller passives but increases EMI risk near sensitive RF sections; requires different layout practices. | Prefer for space-constrained designs needing >350 mA or wider VIN range; validate noise coupling into analog/RF circuits. |
Compared with TLC59202RTJR and TPS62231DRYR, the LM3670MF-1.2 offers superior light-load efficiency via intelligent PFM entry, proven 350 mA capability in SOT-23, and seamless integration with standard 1-MHz filter design practices - making it optimal for cost-sensitive, battery-duration–driven portable systems.
Availability
LM3670MF-1.2 is available at Aetrix Electronics and suitable for mobile phones, handheld instrumentation, PDAs, portable sensors, and battery-powered industrial controllers requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LM3670MF-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 delivering analog and embedded processing solutions, with leadership in power management ICs for portable and industrial applications.
The LM3670 product line was designed specifically for ultralow-voltage, high-efficiency DC-DC conversion in space- and battery-limited portable electronics - emphasizing minimal external components, automatic mode optimization, and robust operation across battery discharge curves.
FAQ
What is the output voltage accuracy of the LM3670MF-1.2 under full load?
The LM3670MF-1.2 delivers 1.2 V output with ±4.5% tolerance across 0–150 mA load and full temperature range (−40°C to +125°C), as specified in the Electrical Characteristics table. At 10 mA load and 25°C, accuracy tightens to ±2% - verified by TI's production test data and confirmed in the SNVS250F datasheet revision F.
Can the LM3670MF-1.2 operate from a single 2.7 V Li-Ion cell throughout its discharge curve?
Yes. The LM3670MF-1.2 supports input down to 2.5 V and enters 100% duty-cycle mode below dropout, sustaining regulated 1.2 V output until VIN drops to approximately 1.4 V (VOUT + ILOAD × RDSON). This allows functional operation through the full 2.7–2.5 V flat discharge region of a Li-Ion cell without external intervention.
Does the LM3670MF-1.2 require an external feedback resistor network?
No. The LM3670MF-1.2 is a fixed-output variant: its feedback divider is internal and factory-trimmed for 1.2 V. Pin 4 (FB) is not user-accessible in this version - unlike the adjustable LM3670MX-ADJ - simplifying design and eliminating resistor tolerance errors.
What is the maximum achievable efficiency of the LM3670MF-1.2 and at what conditions?
The LM3670MF-1.2 achieves up to 94% efficiency at 10 mA load with 3.6 V input and 1.2 V output, per Figure 5 in the SNVS250F datasheet. Efficiency remains ≥90% from 1 mA to 350 mA, dropping only marginally at higher currents due to conduction losses in internal PFET/NFET switches and inductor DCR.
How does the LM3670MF-1.2 handle short-circuit conditions on its output?
The LM3670MF-1.2 incorporates cycle-by-cycle current limiting with a typical peak switch current threshold of 750 mA. During sustained short-circuit, it enters hiccup mode - shutting down for ~1 ms after current limit trip, then attempting restart - preventing thermal runaway and enabling safe recovery once fault clears, as documented in Section 7.4.1.2.
LM3670MF-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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- 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-1.2 FAQ
1.How can I place an order for LM3670MF-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3670MF-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 LM3670MF-1.2 reliable?
The price and inventory of LM3670MF-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 LM3670MF-1.2 is usually 5 days.
3.What payment methods are accepted for LM3670MF-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3670MF-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3670MF-1.2?
LM3670MF-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3670MF-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 LM3670MF-1.2?
For technical support, including LM3670MF-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3670MF-1.2 requirements.
6.How does Aetrix verify that LM3670MF-1.2 is sourced from the original manufacturer or authorized distributors?
All LM3670MF-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 LM3670MF-1.2 meets industry standards.
7.What is the process for return or replacement of LM3670MF-1.2?
All LM3670MF-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3670MF-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 LM3670MF-1.2 part is unused and in its original packaging.
Return procedure for LM3670MF-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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