My Inquiry
My Account
Texas Instruments LM2670SX-ADJ/NOPB
- Part No.:
- LM2670SX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670SX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,178
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2670SX-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC converter IC delivering up to 3A output current with adjustable output voltage (1.2V–37V), 8V–40V input range, 260kHz fixed switching frequency, and 94% peak efficiency. It integrates a 150mΩ DMOS high-side switch and supports external clock synchronization for EMI control in communications power supplies.
For engineers reviewing the LM2670SX-ADJ/NOPB datasheet, LM2670SX-ADJ/NOPB pinout, LM2670SX-ADJ/NOPB application, or LM2670SX-ADJ/NOPB equivalent, key selection criteria include its ±2% output tolerance over line/load/temperature, 50µA shutdown quiescent current, thermal shutdown protection, and compatibility with standard off-the-shelf inductors and Schottky diodes in TO-263-7 packaging.
Technical Context
The LM2670SX-ADJ/NOPB implements a voltage-mode PWM controller with internal 260kHz oscillator and optional external sync input (280–400kHz), enabling precise ripple frequency positioning. Its feedback loop uses a two-stage high-gain amplifier referenced to a 1.21V internal reference, supporting resistor-divider programming for output voltages from 1.2V to 37V.
It features integrated current limiting (3.6–5.4A), thermal shutdown, and ON/OFF control with 0.8–2.0V enable threshold. The high-side DMOS switch operates with RDS(ON) = 0.15–0.29Ω across –40°C to 125°C, and the CBOOST pin enables gate drive bootstrapping for full enhancement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 3A continuous - supports high-power industrial and telecom loads without external current boosting. |
| Input Voltage Range | 8V to 40V - accommodates wide-input industrial rails, battery systems, and unregulated DC supplies. |
| Output Voltage Range | 1.2V to 37V (adjustable) - configured via external resistor divider on FB pin; enables flexible system-level voltage scaling. |
| Switching Frequency | 260kHz fixed internal oscillator - ensures predictable EMI profile and simplifies filter design with standard inductor values. |
| Efficiency | Up to 94% - achieved via low RDS(ON) (150mΩ typ.) DMOS switch and optimized gate drive architecture. |
| Feedback Reference | 1.21V ±1.2% - sets output accuracy; combined with resistor tolerance yields ±2% total VOUT tolerance over full operating conditions. |
| Quiescent Current | 50µA in shutdown - enables ultra-low-power standby modes in battery-backed or energy-sensitive applications. |
Pinout & Package
LM2670SX-ADJ/NOPB is supplied in KTW (TO-263-7) package: thermally enhanced surface-mount variant with exposed thermal pad, 10.1mm × 15.24mm footprint, and 7-pin configuration optimized for high-current buck conversion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | Drain node of internal high-side DMOS FET - connects directly to inductor and Schottky diode cathode; carries high-frequency pulsed current. |
| 2 (VIN) | Input Supply | Main power input (8–40V); supplies both load path and internal bias - requires low-ESR bypass capacitor placed adjacent to this pin. |
| 3 (CBOOST) | Bootstrap Capacitor | Connects 100nF ceramic capacitor to SW pin - generates gate drive voltage > VIN to fully enhance high-side FET and minimize conduction loss. |
| 4 (GND) | Power Ground | Primary return path for input/output capacitors and internal circuitry - must be tied to low-impedance ground plane for stability and EMI control. |
| 5 (SYNC) | Sync Input | Accepts external TTL/CMOS clock (280–400kHz) to override internal oscillator - enables synchronized ripple for multi-rail systems and spectrum positioning. |
| 6 (FB) | Feedback Input | Senses output voltage via resistor divider - internal 1.21V reference sets regulation point; open for fixed-output versions, used for adjustment here. |
| 7 (ON/OFF) | Enable Control | Logic-level enable pin (1.4V threshold); pulls low to enter 50µA shutdown - internal 20µA pull-up allows floating for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS Switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity while maintaining >90% efficiency at 3A. |
| External Clock Synchronization | Enables deterministic ripple frequency alignment across multiple converters - critical for noise-sensitive radio and comms equipment. |
| ±2% Output Tolerance | Guaranteed over full line (8–40V), load (100mA–3A), and temperature (–40°C to 125°C) - reduces need for post-regulation trimming in precision systems. |
| Thermal Shutdown & Current Limit | Protects against sustained overload and PCB overheating - automatically recovers after fault removal, supporting robust field-deployed designs. |
| WEBENCH® Design Integration | TI's online tool provides validated component selection, schematic generation, and performance simulation - cuts design cycle from days to hours. |
Applications
| Industrial Power Preregulator | Telecom DC-DC Module |
|---|---|
Use Scenario: Provides stable 5V or 12V intermediate rail from 24V or 48V backplane in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Primary step-down regulator with fixed-frequency PWM control and thermal protection - serves as efficient preregulator ahead of LDOs or point-of-load converters. Use Value: Delivers 3A at >92% efficiency with minimal heatsinking, reducing board area and thermal management cost versus linear solutions. | Use Scenario: Powers RF transceiver modules and baseband processors in cellular infrastructure where spectral purity and low standby drain are critical. IC Role / Device Role / Timing Role: Adjustable-output buck converter synchronized to system clock - ensures consistent switching ripple placement to avoid interference with sensitive receive bands. Use Value: External SYNC capability enables ripple frequency locking to 300kHz or 350kHz, simplifying EMI filter design and passing EN 55022 Class B compliance. |
| Battery Charger Front-End | Automotive Aftermarket Power Supply |
Use Scenario: Converts 12V–36V vehicle battery or solar input to regulated 14.4V charging voltage for Li-ion packs in portable tools or e-bikes. IC Role / Device Role / Timing Role: High-input-voltage buck controller with adjustable output and robust overvoltage/overcurrent protection - manages bulk charging stage before CC/CV regulation. Use Value: 40V absolute max input rating and built-in current limit tolerate automotive load-dump transients; 50µA shutdown extends battery life during storage. | Use Scenario: Supplies 3.3V or 5V to infotainment head units and ADAS sensors from variable 9V–16V automotive battery with cold-crank resilience. IC Role / Device Role / Timing Role: Wide-input buck regulator with –40°C to 125°C junction rating - operates reliably under engine bay thermal stress and voltage fluctuations. Use Value: 8V minimum input ensures functionality during cranking (down to ~6.5V at terminals due to drop); TO-263 package enables direct heatsink mounting for sustained 2.5A loads. |
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 |
|---|---|---|---|
| LM2596SX-ADJ/NOPB | Lower 1.5A output current, 150kHz switching frequency, no SYNC input, higher RDS(ON) (220mΩ). | Best suited for lower-power, cost-sensitive designs where EMI synchronization is unnecessary and thermal budget allows larger inductors. | Select when 3A output and external sync are not required; verify inductor size and efficiency trade-offs at full load. |
| TPS54302DDAR | 3A synchronous buck with integrated high/low-side FETs, 2.5V–6V input, no high-voltage capability, 500kHz–2.2MHz adjustable frequency. | Ideal for low-input-voltage applications (e.g., 5V or 12V rails), but cannot replace LM2670SX-ADJ/NOPB in 24V+ or 40V-tolerant systems. | Choose only for sub-6V input designs requiring higher frequency or synchronous rectification; incompatible with 8–40V input requirement. |
Compared with LM2596SX-ADJ/NOPB, the LM2670SX-ADJ/NOPB delivers 100% higher current, tighter output tolerance, and EMI-controllable sync capability; versus TPS54302DDAR, it supports 6.7× higher input voltage but lacks synchronous rectification - making it the sole viable option for ruggedized 24–40V industrial or automotive buck conversion.
Availability
LM2670SX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power preregulators, telecom DC-DC modules, battery charger front-ends, and automotive aftermarket power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2670SX-ADJ/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, robust, and easy-to-implement buck regulators using standard external components, targeting industrial, telecom, and automotive power systems.
FAQ
What is the maximum input voltage rating for LM2670SX-ADJ/NOPB?
The LM2670SX-ADJ/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 8V to 40V. This makes it suitable for 24V and 36V industrial systems, automotive battery inputs (including load dump), and telecom -48V derived rails. Exceeding 40V continuously risks exceeding thermal limits and degrading long-term reliability, even if within absolute max ratings.
Does LM2670SX-ADJ/NOPB require an external Schottky diode?
Yes, the LM2670SX-ADJ/NOPB requires an external Schottky diode connected between the SW pin and output capacitor ground. Unlike synchronous buck controllers, it uses an N-channel DMOS high-side switch only; the diode provides the return path during the low-side conduction phase. TI recommends 3A-rated, low-VF Schottky diodes such as SS34 or MBR340 for optimal efficiency and thermal performance.
How is output voltage set on LM2670SX-ADJ/NOPB?
The LM2670SX-ADJ/NOPB uses a resistor divider from VOUT to GND, with the midpoint connected to the FB pin. The internal reference is 1.21V, so VOUT = 1.21V × (1 + R1/R2). For example, R1 = 10kΩ and R2 = 1.24kΩ yields ~11.4V. Layout best practices require short, direct traces to FB and shielding from inductor fields to prevent regulation error or instability.
Can LM2670SX-ADJ/NOPB synchronize to an external clock?
Yes, LM2670SX-ADJ/NOPB supports external synchronization via the SYNC pin (Pin 5). An external TTL/CMOS clock signal between 280kHz and 400kHz can override the internal 260kHz oscillator. This feature enables precise ripple frequency control for EMI filtering and multi-converter phase alignment - essential in dense telecom and RF systems where switching noise must be spectrally managed.
What thermal considerations apply to LM2670SX-ADJ/NOPB in TO-263-7 package?
In the KTW (TO-263-7) package, LM2670SX-ADJ/NOPB achieves RθJA ≈ 35°C/W with 0.4896 in² copper pour and ≈ 26°C/W with 1.0064 in² copper plus thermal vias. The exposed thermal pad must be soldered to a solid ground plane. At 3A output and 24V input, typical power dissipation is ~1.8W; without adequate copper area, junction temperature can exceed 125°C. Thermal shutdown activates at ~165°C and auto-recovers upon cooling.
LM2670SX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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)
LM2670SX-ADJ/NOPB FAQ
1.How can I place an order for LM2670SX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SX-ADJ/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 LM2670SX-ADJ/NOPB reliable?
The price and inventory of LM2670SX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670SX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670SX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SX-ADJ/NOPB?
LM2670SX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SX-ADJ/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 LM2670SX-ADJ/NOPB?
For technical support, including LM2670SX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2670SX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670SX-ADJ/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 LM2670SX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670SX-ADJ/NOPB?
All LM2670SX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SX-ADJ/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 LM2670SX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2670SX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2670SX-ADJ/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
