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Texas Instruments LM2670T-5.0/NOPB
- Part No.:
- LM2670T-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2670T-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LM2670T-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3 A output current with fixed 5 V output, 8–40 V input range, 260 kHz internal oscillator, ±2% output voltage tolerance, and 150 mΩ DMOS high-side switch - used in battery chargers, communications equipment, and system preregulators.
For engineers reviewing the LM2670T-5.0/NOPB datasheet, LM2670T-5.0/NOPB pinout, LM2670T-5.0/NOPB application, or LM2670T-5.0/NOPB equivalent, key selection criteria include input voltage range, standby current, thermal performance in TO-263 package, sync capability for EMI control, and fixed-output regulation accuracy under full load and temperature.
Technical Context
The LM2670T-5.0/NOPB implements a voltage-mode PWM controller with an integrated 150 mΩ DMOS high-side switch, operating at a fixed 260 kHz internal oscillator frequency (225–280 kHz over temperature). It uses external synchronous rectification via Schottky diode and supports external clock synchronization from 280–400 kHz for ripple frequency control.
Its functional architecture includes dedicated ON/OFF enable logic with 1.4 V threshold, feedback amplifier referenced to internal 1.21 V bandgap, and bootstrapped gate drive via CBOOST capacitor - enabling efficient high-current buck conversion without external MOSFET drivers or compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line, load, and –40°C to 125°C junction temperature - ensures stable rail for digital logic and analog circuitry without external resistor divider. |
| Input Voltage Range | 8 V to 40 V - supports wide industrial, automotive, and telecom input sources including unregulated 12/24 V systems and battery packs. |
| Max Output Current | 3 A continuous - enables single-chip power delivery for mid-power subsystems without parallel devices or heatsink dependency. |
| Switch RDS(ON) | 150 mΩ typical - minimizes conduction loss and improves efficiency above 90% at 3 A, reducing thermal stress in TO-263 package. |
| Standby Current | 50 µA max when ON/OFF pin = 0 V - allows low-power sleep modes in portable and always-on systems. |
| Oscillator Frequency | 260 kHz fixed (225–280 kHz over temp) - balances inductor size, EMI, and efficiency; externally synchronizable to 280–400 kHz for spectral management. |
| Thermal Shutdown | Integrated - protects against sustained overload or poor PCB copper area; auto-recovery on cooldown. |
Pinout & Package
LM2670T-5.0/NOPB is supplied in KTW (TO-263-7) package: thermally enhanced 7-pin surface-mount variant with exposed thermal pad soldered to PCB ground plane for optimal heat dissipation (RθJA = 35°C/W with 0.4896 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | Drain node of internal DMOS FET; connects directly to inductor and Schottky cathode - carries high di/dt switching current; requires short, low-inductance layout. |
| 2 (VIN) | Input Supply | Main power input (8–40 V); supplies both load path and internal bias - must be decoupled with low-ESR capacitor placed adjacent to pin. |
| 3 (CBOOST) | Bootstrap Capacitor | Connects to SW pin via 100 nF ceramic capacitor; provides gate-drive voltage > VIN to fully enhance internal FET - critical for low RDS(ON) operation. |
| 4 (GND) | Power Ground | Primary return path for input/output capacitors and thermal pad - must tie directly to large ground plane to minimize noise and improve thermal performance. |
| 5 (SYNC) | Synchronization Input | Accepts external TTL/CMOS clock (280–400 kHz); overrides internal oscillator to fix ripple frequency - enables consistent EMI filtering and spectrum positioning in comms/radio gear. |
| 6 (FB) | Feedback Input | Internally connected to 5 V output divider - no external resistors needed; senses regulated output directly for ±2% accuracy across conditions. |
| 7 (ON/OFF) | Enable Control | Logic-level shutdown input (1.4 V threshold); pulls to GND to enter 50 µA standby - supports system-level power sequencing and low-power states. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150 mΩ DMOS Switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity while maintaining >90% efficiency at 3 A. |
| Fixed 5 V Output with ±2% Tolerance | Guarantees precise regulation across –40°C to 125°C without trimming or calibration - suitable for powering microcontrollers, sensors, and interface ICs. |
| External SYNC Capability (280–400 kHz) | Enables deterministic output ripple frequency for repeatable EMI filter design and compliance testing in sensitive RF environments. |
| 50 µA Standby Quiescent Current | Supports energy-sensitive applications like battery-backed systems and IoT edge nodes requiring long sleep duration without significant drain. |
| Thermal Shutdown + Current Limit | Provides autonomous protection against overtemperature and short-circuit faults - prevents damage during transient overload or inadequate heatsinking. |
Applications
| Battery Charging Systems | Communications Equipment |
|---|---|
Use Scenario: Step-down conversion from 12–24 V vehicle or wall adapter input to stable 5 V for Li-ion charging ICs and USB-PD companion circuits. IC Role / Device Role / Timing Role: Primary buck regulator supplying constant-voltage stage; operates at fixed 260 kHz or synchronized frequency to avoid interference with baseband or RF sections. Use Value: Delivers 3 A at >90% efficiency with minimal thermal rise in TO-263 package, enabling compact, fanless charger designs compliant with thermal safety standards. | Use Scenario: Preregulation of 48 V telecom or 24 V PoE-derived supply to clean 5 V rail for FPGA I/O banks, Ethernet PHYs, and RF front-end biasing. IC Role / Device Role / Timing Role: High-efficiency intermediate converter; SYNC pin locked to system master clock to align switching noise away from sensitive receive bands. Use Value: Reduces conducted EMI through frequency control and achieves ±2% output stability across wide input transients - critical for signal integrity in multi-gigabit interfaces. |
| Industrial Control Systems | Medical Monitoring Devices |
Use Scenario: Powering PLC I/O modules, sensor signal conditioners, and isolated CAN transceivers from unregulated 24 V DC field wiring. IC Role / Device Role / Timing Role: Robust primary DC-DC stage with wide 8–40 V input range and built-in thermal/current protection - handles brownouts and surges common in factory environments. Use Value: Maintains regulation during 100 ms input dips; 125°C max junction rating ensures reliability in enclosed enclosures without forced air cooling. | Use Scenario: Generating isolated 5 V supply for patient-connected analog front-ends and low-power microcontrollers in portable ECG or pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, low-quiescent power source enabled only during active measurement cycles via ON/OFF pin control. Use Value: 50 µA standby current extends battery life between measurements; ±2% output accuracy preserves ADC reference integrity and sensor calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671-5.0 | Same family, but 1 A output current and SOIC-8 package - lower thermal capacity and no SYNC pin. | Suitable only for <1 A loads; lacks frequency synchronization for EMI-sensitive designs. | Select LM2671-5.0 only when board space is constrained and peak load ≤1 A; not drop-in for LM2670T-5.0/NOPB's 3 A or SYNC requirements. |
| TPS54302DDCR | 3 A synchronous buck with integrated high/low-side FETs, 4.5–28 V input, 570 kHz switching, and adjustable output - requires external feedback resistors. | Higher efficiency at light loads due to synchronous rectification; narrower input range excludes 36–40 V applications. | Choose TPS54302DDCR when input stays ≤28 V and higher light-load efficiency is prioritized; verify layout compatibility with smaller 6-pin SOT-23-6 footprint. |
Compared with LM2671-5.0 and TPS54302DDCR, LM2670T-5.0/NOPB uniquely combines 3 A capability, 8–40 V input, fixed 5 V output, SYNC support, and TO-263 thermal robustness - making it optimal for industrial and telecom preregulator roles where input range and EMI control are critical.
Availability
LM2670T-5.0/NOPB is available at Aetrix Electronics and suitable for battery charging systems, communications equipment, and industrial control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2670T-5.0/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, high-efficiency, and robustness in non-isolated DC-DC buck applications across industrial, automotive, and communications markets.
FAQ
What is the maximum input voltage rating for LM2670T-5.0/NOPB?
The absolute maximum input voltage for LM2670T-5.0/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation beyond 40 V risks exceeding safe operating area limits and may trigger internal protection or cause permanent damage. Designers should maintain input within 40 V with appropriate transient suppression for reliability.
Does LM2670T-5.0/NOPB require external feedback resistors?
No, LM2670T-5.0/NOPB does not require external feedback resistors. It is a fixed 5 V output variant with internal resistor divider connected to the FB pin, enabling direct connection to the output capacitor. This simplifies design and eliminates resistor tolerance errors affecting output accuracy.
Can LM2670T-5.0/NOPB synchronize to an external clock?
Yes, LM2670T-5.0/NOPB supports external synchronization via its SYNC pin (Pin 5), accepting TTL/CMOS-compatible clocks from 280 kHz to 400 kHz. This feature fixes the switching frequency for predictable EMI filtering and avoids beat frequencies in multi-rail systems - critical in radio and communications equipment.
What thermal performance can be expected from LM2670T-5.0/NOPB in its TO-263 package?
In the KTW (TO-263-7) package with 0.4896 in² (3.6× package area) of 1 oz copper, LM2670T-5.0/NOPB achieves RθJA = 56°C/W. With full thermal pad soldering and 12 vias to inner ground layers, RθJA improves to 26°C/W - enabling 3 A operation at ambient up to 85°C without forced airflow.
How does the ON/OFF pin function on LM2670T-5.0/NOPB?
The ON/OFF pin (Pin 7) enables logic-level control: voltage ≥1.4 V turns LM2670T-5.0/NOPB on; ≤0.8 V forces shutdown with 50 µA standby current. It features internal 20 µA pull-up and 7 V Zener clamp - allowing direct MCU GPIO control without external biasing components.
LM2670T-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2670T-5.0/NOPB FAQ
1.How can I place an order for LM2670T-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670T-5.0/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 LM2670T-5.0/NOPB reliable?
The price and inventory of LM2670T-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670T-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670T-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670T-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670T-5.0/NOPB?
LM2670T-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670T-5.0/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 LM2670T-5.0/NOPB?
For technical support, including LM2670T-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670T-5.0/NOPB requirements.
6.How does Aetrix verify that LM2670T-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670T-5.0/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 LM2670T-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670T-5.0/NOPB?
All LM2670T-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670T-5.0/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 LM2670T-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2670T-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2670T-5.0/NOPB Tags
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