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Texas Instruments LM2670S-12/NOPB
- Part No.:
- LM2670S-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670S-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
LM2670S-12/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3 A output current with fixed 12 V output, 8–40 V input range, 260 kHz internal oscillator, ±2% output voltage tolerance, and 94% peak efficiency at 24 VIN/3 A. It integrates a 150 mΩ DMOS high-side switch and supports external clock synchronization for EMI-sensitive communications and radio equipment.
For engineers reviewing the LM2670S-12/NOPB datasheet, LM2670S-12/NOPB pinout, LM2670S-12/NOPB application, or LM2670S-12/NOPB equivalent, key selection criteria include its 12 V fixed output, thermal shutdown and current limiting protection, ON/OFF control with 50 µA standby current, SYNC capability for ripple frequency control, and TO-263-7 (KTW) package suitability for high-current industrial power supplies.
Technical Context
The LM2670S-12/NOPB implements a voltage-mode PWM controller with an internal 260 kHz ramp oscillator driving a high-side DMOS switch. Its feedback loop senses output voltage directly at the FB pin (shorted to VOUT in fixed versions), enabling regulation without external resistors. The device operates in continuous conduction mode across full load range and includes built-in overcurrent protection via cycle-by-cycle current limit (3.6–5.4 A) and thermal shutdown.
It supports two functional modes: active regulation (ON/OFF ≥ 1.4 V) and shutdown (ON/OFF ≤ 0.8 V), drawing only 50 µA quiescent current in standby. External synchronization (280–400 kHz) overrides the internal oscillator and disables frequency foldback during overload - a critical design consideration for short-circuit robustness in battery charger or preregulator applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12 V ±2% over –40°C to 125°C junction temperature and full line/load conditions - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Input voltage range | 8 V to 40 V - supports wide-input industrial, automotive, and telecom power buses including 12 V, 24 V, and 36 V nominal systems. |
| Max output current | 3 A continuous - sufficient to power FPGA I/O banks, microcontroller cores, or multiple peripheral ICs from a single buck stage. |
| Switch RDS(ON) | 0.15 Ω typical - minimizes conduction loss and enables >94% efficiency at 24 VIN/3 A, reducing thermal stress on PCB layout. |
| Oscillator frequency | 260 kHz fixed internal - sets baseline switching period (≈3.85 µs) for inductor sizing and EMI filter design; externally syncable to 280–400 kHz for spectral positioning. |
| Standby current | 50 µA max - enables low-power system sleep states without disconnecting input supply, preserving state in battery-backed applications. |
| Current limit | 3.6 A min to 5.4 A max over temperature - provides overcurrent protection while allowing brief inrush or transient surges without false triggering. |
Pinout & Package
LM2670S-12/NOPB is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.1 mm × 15.24 mm. The package features integrated heat dissipation via the thermal pad connected to GND, supporting up to 3 A continuous operation with appropriate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET; connects to inductor and Schottky diode cathode - must be routed with minimal loop area to reduce EMI and voltage spikes. |
| 2 (VIN) | Input supply | Main power input (8–40 V); requires local 10–100 µF low-ESR capacitor placed adjacent to pin to stabilize gate drive and suppress high-frequency noise. |
| 3 (CBOOST) | Bootstrap capacitor | Connects 100 nF ceramic capacitor to SW pin to generate gate voltage > VIN for full enhancement of internal FET - critical for low RDS(ON) and efficiency. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and thermal pad; must be tied directly to large copper pour for thermal management and noise immunity. |
| 5 (SYNC) | Synchronization input | Accepts TTL/CMOS clock (280–400 kHz) to lock switching frequency - used for EMI reduction in radios or co-located switching supplies. |
| 6 (FB) | Feedback sense | Internally tied to 12 V output divider; shorted to VOUT in fixed version - no external resistors needed, eliminating calibration error and BOM cost. |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4 V enables regulation; ≤0.8 V disables output and reduces quiescent draw to 50 µA - enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150 mΩ DMOS switch | Eliminates need for external MOSFET and driver, reducing component count and layout complexity while maintaining 94% peak efficiency at full load. |
| Fixed 12 V output with ±2% tolerance | Guarantees accurate voltage delivery across temperature and line/load variations - avoids post-regulation LDO stages in cost-sensitive designs. |
| External clock synchronization (280–400 kHz) | Enables precise control of output ripple frequency for consistent EMI filtering and compliance in communication equipment and RF subsystems. |
| Thermal shutdown + current limiting | Provides autonomous fault protection without external circuitry - prevents damage during overload, short-circuit, or inadequate heatsinking conditions. |
| WEBENCH® Power Designer support | Generates complete bill-of-materials, schematic, and performance simulation in seconds - accelerates design validation and reduces time-to-prototype. |
Applications
| Industrial Power Preregulator | Battery Charger Front-End |
|---|---|
Use Scenario: Converts unregulated 24 V or 36 V factory bus to stable 12 V for powering PLC I/O modules, sensors, and actuators. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 12 V rail with built-in overcurrent and thermal protection. Use Value: Eliminates need for discrete MOSFET + controller solution, reducing board space by 40% and improving MTBF through integrated protection. | Use Scenario: Supplies constant-voltage stage for Li-ion or lead-acid battery charging circuits requiring clean, regulated 12 V input to charge management ICs. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering precise 12 V with tight tolerance and low ripple - critical for accurate charge voltage reference. Use Value: Achieves <1% output ripple with proper output capacitor selection, ensuring stable feedback to battery fuel gauges and charge controllers. |
| Communications Equipment Supply | Radio Transceiver Power |
Use Scenario: Powers baseband processors and interface ICs in wired telecom gear (e.g., DSLAMs, OLTs) where EMI must meet CISPR-22 Class B limits. IC Role / Device Role / Timing Role: Synchronized buck regulator operating at fixed 260 kHz or externally locked frequency to avoid interference with data transmission bands. Use Value: SYNC pin allows alignment of switching harmonics away from sensitive receive bands, simplifying EMI filter design and certification testing. | Use Scenario: Supplies 12 V bias to RF power amplifiers and mixer stages in HF/VHF transceivers where supply noise directly impacts signal-to-noise ratio. IC Role / Device Role / Timing Role: Low-noise, high-PSSR buck regulator with minimized switching jitter - enabled by stable internal oscillator and robust feedback path. Use Value: Delivers <20 mVPP output ripple under full load when paired with low-ESR tantalum + ceramic output capacitors, preserving receiver sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671-12/NOPB | Same pinout, 3 A rating, but uses external diode instead of synchronous rectification - lower efficiency (≈90%) and higher thermal load. | Preferred where cost sensitivity outweighs efficiency; unsuitable for sealed enclosures or high ambient temperatures. | Select LM2671-12/NOPB only if diode BOM cost savings justify 4% efficiency penalty and added thermal design effort. |
| TPS54318RTER | 3 A, 12 V fixed, 2.95–6 V input - incompatible input range; requires pre-regulation stage for 8–40 V inputs. | Applicable only in low-input systems (e.g., 5 V rail conversion); not a direct replacement for wide-input industrial use cases. | Choose TPS54318RTER only for new designs with ≤6 V input; LM2670S-12/NOPB remains optimal for 8–40 V native operation. |
Compared with LM2671-12/NOPB, LM2670S-12/NOPB delivers higher efficiency and lower thermal footprint due to integrated DMOS switch; compared with TPS54318RTER, it supports native wide-input operation without cascaded regulation - making it uniquely suited for industrial and telecom power architectures.
Availability
LM2670S-12/NOPB is available at Aetrix Electronics and suitable for industrial power preregulators, battery charger front-ends, communications equipment supplies, and radio transceiver power rails requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2670S-12/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 engineers needing fast, reliable, and low-risk DC-DC buck regulator implementations in industrial, telecom, and battery-powered systems - emphasizing ease-of-use, thermal robustness, and integration.
FAQ
What is the maximum input voltage rating for LM2670S-12/NOPB?
The absolute maximum input voltage for LM2670S-12/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding safe SOA limits and may trigger internal protection or cause premature failure. For sustained reliability in 36 V nominal systems, derating to ≤38 V is advised per TI's thermal guidelines in SNVS036L Section 5.1.
Does LM2670S-12/NOPB require external feedback resistors?
No, LM2670S-12/NOPB does not require external feedback resistors. As a fixed-output variant, it internally connects the FB pin to a precision voltage divider set for 12 V. Pin 6 (FB) must be directly connected to the output capacitor's positive terminal - adding external resistors would disrupt regulation and violate the device's specified configuration.
Can LM2670S-12/NOPB synchronize to a 350 kHz external clock?
Yes, LM2670S-12/NOPB accepts external synchronization signals from 280 kHz to 400 kHz, so 350 kHz is fully supported. When SYNC is active, the internal 260 kHz oscillator is disabled, and switching frequency locks precisely to the external clock edge. Note that current-limit foldback is inactive during SYNC mode, requiring careful short-circuit analysis in final design.
What thermal performance can be expected from LM2670S-12/NOPB in TO-263 package?
In the KTW (TO-263-7) package with 1.0064 in² copper area and 12 thermal vias, LM2670S-12/NOPB achieves RθJA = 26°C/W. At 3 A output and 24 VIN, power dissipation is ≈1.8 W - resulting in ~47°C junction rise above ambient. This enables reliable operation up to 78°C ambient at full load without forced air, per TI's thermal metrics in SNVS036L Section 5.4.
Is LM2670S-12/NOPB RoHS compliant and lead-free?
Yes, LM2670S-12/NOPB is RoHS compliant and lead-free. The /NOPB suffix explicitly denotes "No Lead (Pb)-Free" packaging per TI's product nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for lead-free reflow soldering profiles up to 260°C peak, as documented in TI's packaging information for KTW devices.
LM2670S-12/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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):
- 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2670S-12/NOPB FAQ
1.How can I place an order for LM2670S-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670S-12/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 LM2670S-12/NOPB reliable?
The price and inventory of LM2670S-12/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670S-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670S-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670S-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670S-12/NOPB?
LM2670S-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670S-12/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 LM2670S-12/NOPB?
For technical support, including LM2670S-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670S-12/NOPB requirements.
6.How does Aetrix verify that LM2670S-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670S-12/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 LM2670S-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670S-12/NOPB?
All LM2670S-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670S-12/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 LM2670S-12/NOPB part is unused and in its original packaging.
Return procedure for LM2670S-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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