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Texas Instruments LM2670S-3.3/NOPB
- Part No.:
- LM2670S-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670S-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:230
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Product details
Overview
LM2670S-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator delivering up to 3 A output current at a fixed 3.3 V, with 8–40 V input range, ±2% output voltage tolerance over line/load/temperature, and 260 kHz internal oscillator frequency. It integrates a 150 mΩ DMOS high-side switch and supports external clock synchronization for EMI control in communications and radio equipment.
For engineers reviewing the LM2670S-3.3/NOPB datasheet, LM2670S-3.3/NOPB pinout, LM2670S-3.3/NOPB application, or LM2670S-3.3/NOPB equivalent, key selection criteria include its 3.3 V fixed output, 50 µA standby current in shutdown mode, thermal shutdown and current limiting protection, and compatibility with off-the-shelf inductors and Schottky diodes for rapid design implementation.
Technical Context
The LM2670S-3.3/NOPB implements a voltage-mode PWM controller with an internal 260 kHz oscillator and supports external synchronization from 280–400 kHz to fix ripple frequency. Its integrated 150 mΩ DMOS high-side switch enables >90% efficiency across load conditions, while the feedback pin (FB) connects directly to the output for fixed-voltage regulation without external resistors.
It operates in continuous conduction mode by default, features built-in thermal shutdown and cycle-by-cycle current limiting, and uses a bootstrap capacitor (CB) on Pin 3 to drive the high-side MOSFET gate above VIN-enabling full enhancement and minimizing conduction losses at up to 3 A output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% over –40°C to 125°C junction temperature, 8–40 V input, 100 mA–3 A load - ensures stable logic supply for microcontrollers and FPGAs. |
| Max Output Current | 3 A continuous - supports high-current digital loads without external current boosting. |
| Input Voltage Range | 8 V to 40 V - compatible with 12 V/24 V industrial rails and battery-backed systems. |
| Switch RDS(ON) | 0.15 Ω typical - reduces conduction loss and improves thermal performance at full load. |
| Standby Current | 50 µA when ON/OFF pin = 0 V - enables ultra-low-power system sleep states. |
| Oscillator Frequency | 260 kHz fixed internal frequency - sets baseline switching period; externally synchronizable to 280–400 kHz for EMI filtering alignment. |
| Efficiency | 86% typical at 12 VIN, 3 AOUT - delivers high power conversion efficiency without complex layout or heatsinking. |
Pinout & Package
LM2670S-3.3/NOPB is packaged in the KTW (TO-263-7) thermally enhanced surface-mount package, featuring a 10.1 mm × 15.24 mm outline and exposed thermal pad for PCB heat sinking.
| 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; switches between VIN and ~–0.5 V during OFF time. |
| 2 (VIN) | Input | Main power input (8–40 V); supplies internal bias and high-side switch - requires low-ESR bypass capacitor placed adjacent to this pin. |
| 3 (CBOOST/CB) | Bootstrap capacitor | Connects to SW pin via 100 nF ceramic capacitor - generates gate drive voltage > VIN to fully enhance internal FET and minimize RDS(ON). |
| 4 (GND) | Power ground | Common return for input/output capacitors and thermal pad - must be tied to large copper area for thermal and noise control. |
| 5 (SYNC) | Synchronization input | Accepts external TTL/CMOS clock (280–400 kHz) to lock switching frequency - enables deterministic EMI spectrum placement and consistent filter design. |
| 6 (FB) | Feedback | Direct connection to output for fixed 3.3 V regulation - no external resistor divider needed; internal reference set to 1.21 V. |
| 7 (ON/OFF) | Enable control | Logic-level enable: >1.4 V = active, <0.8 V = shutdown - draws only 50 µA in OFF state; internal 20 µA pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150 mΩ DMOS high-side switch | Enables 3 A output without external MOSFETs or gate drivers - reduces BOM count and layout complexity. |
| ±2% output voltage tolerance | Guarantees compliance with 3.3 V I/O standards (e.g., LVCMOS, PCI-X) across full temperature and load range. |
| External clock synchronization (280–400 kHz) | Allows precise ripple frequency control for EMI-sensitive applications like RF transceivers and data converters. |
| Thermal shutdown + current limiting | Provides autonomous fault protection without external circuitry - prevents damage during overload or poor heatsinking. |
| WEBENCH® Power Designer support | Generates complete schematics, bill-of-materials, and performance simulations - accelerates design-to-prototype cycle. |
Applications
| Industrial PLC Power Supply | Communications Baseband Module |
|---|---|
Use Scenario: Provides clean, regulated 3.3 V rail for programmable logic controllers operating from 24 V DC field buses with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary buck converter supplying FPGA I/O banks and ARM Cortex-M microcontroller cores. Use Value: Delivers 3 A at >86% efficiency with ±2% regulation - eliminates need for post-regulation LDOs and reduces thermal load in sealed enclosures. | Use Scenario: Powers baseband processors and ADC/DAC interfaces in cellular infrastructure equipment where EMI must avoid LTE/5G bands. IC Role / Device Role / Timing Role: Synchronized buck regulator locked to system clock domain to position switching noise outside critical receive bands. Use Value: External SYNC pin enables fixed 350 kHz operation - allows optimized LC filter design and meets EN 55032 Class A conducted emissions limits. |
| Battery-Powered Test Instrument | Automotive Body Control Module |
Use Scenario: Supplies 3.3 V to MCU and sensor interface circuitry in portable handheld test gear powered by 12 V Li-ion packs. IC Role / Device Role / Timing Role: High-efficiency preregulator preceding low-noise LDOs for analog signal chains. Use Value: 50 µA shutdown current extends battery life during idle periods - supports >100 hr standby with minimal quiescent drain. | Use Scenario: Generates 3.3 V for CAN transceivers and microcontroller peripherals in 12 V automotive systems with cold-crank (6 V) and load-dump (40 V) transients. IC Role / Device Role / Timing Role: Robust primary DC/DC stage with 8–40 V input range and integrated protection. Use Value: Withstands 40 V transients and shuts down safely at –40°C - meets AEC-Q100 stress requirements without external TVS or reset ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671M-3.3 | Same architecture but TO-220-7 (NDZ) package; higher RθJA (65°C/W vs. 35°C/W for KTW); no exposed thermal pad. | Lower power density; less suitable for compact PCBs or high-ambient-temperature environments. | Select LM2671M-3.3 only if through-hole assembly or legacy footprint compatibility is required. |
| TPS54332DR | 3 A, 3.3 V fixed-output buck with 2.95–6.0 V input range; 1 MHz switching; no SYNC input; smaller 8-pin SOIC package. | Not compatible with 8–40 V inputs; intended for low-voltage point-of-load, not industrial/mid-rail conversion. | Choose TPS54332DR only for 3.3 V systems powered from 3.3 V or 5 V rails - not a functional replacement for LM2670S-3.3/NOPB's wide-input capability. |
Compared with LM2671M-3.3, LM2670S-3.3/NOPB offers superior thermal performance and surface-mount compatibility; versus TPS54332DR, it provides wider input range and synchronization capability essential for industrial and communications designs - making it the only option supporting 24 V bus and EMI-controlled operation.
Availability
LM2670S-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, communications baseband modules, battery-powered test instruments, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for LM2670S-3.3/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 DC/DC conversion in industrial, communications, and automotive applications where robustness and fast time-to-market are critical.
FAQ
What is the maximum input voltage rating for the LM2670S-3.3/NOPB?
The LM2670S-3.3/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operation from 8 V to 40 V. Exceeding 40 V continuously risks violating safe operating area limits, especially under high-temperature conditions. The device includes internal protection against transient overvoltage, but sustained operation above 40 V is not supported per datasheet specifications for LM2670S-3.3/NOPB.
Does the LM2670S-3.3/NOPB require external feedback resistors to set the output voltage?
No. The LM2670S-3.3/NOPB is a fixed-output variant with internal feedback divider calibrated for 3.3 V. Pin 6 (FB) must be connected directly to the output capacitor - no external resistors are needed. This simplifies layout and eliminates resistor tolerance errors that could affect regulation accuracy in the LM2670S-3.3/NOPB.
Can the LM2670S-3.3/NOPB be synchronized to an external clock, and what is the valid frequency range?
Yes. The LM2670S-3.3/NOPB supports external synchronization via Pin 5 (SYNC), accepting TTL- or CMOS-compatible clocks from 280 kHz to 400 kHz. The external frequency must exceed the internal oscillator's maximum (280 kHz) to prevent erratic operation. Using SYNC enables deterministic ripple frequency placement - a key requirement for LM2670S-3.3/NOPB in EMI-sensitive communications designs.
What thermal performance can be expected from the LM2670S-3.3/NOPB in the KTW package?
In the KTW (TO-263-7) package with proper PCB copper area (≥0.4896 in² of 1 oz copper), the LM2670S-3.3/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 35°C/W. With 12 vias to a second-layer ground plane, RθJA improves to 26°C/W - enabling full 3 A output at up to 85°C ambient without forced airflow. Thermal pad soldering is mandatory for LM2670S-3.3/NOPB reliability.
How does the ON/OFF pin function, and what is its threshold voltage?
The ON/OFF pin (Pin 7) enables logic-level control: voltage >1.4 V turns LM2670S-3.3/NOPB on; <0.8 V forces shutdown with 50 µA standby current. An internal 20 µA pull-up holds the pin high if left floating. Driving the pin below 0.8 V guarantees full disable - critical for system-level power sequencing and low-power sleep modes in LM2670S-3.3/NOPB applications.
LM2670S-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Bulk
- 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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2670S-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670S-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2670S-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670S-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670S-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670S-3.3/NOPB?
LM2670S-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670S-3.3/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-3.3/NOPB?
For technical support, including LM2670S-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670S-3.3/NOPB requirements.
6.How does Aetrix verify that LM2670S-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670S-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670S-3.3/NOPB?
All LM2670S-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670S-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2670S-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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