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Texas Instruments LM2670SDX-ADJ/NOPB
- Part No.:
- LM2670SDX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SDX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,225
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Product details
Overview
LM2670SDX-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC delivering up to 3A output current, supporting adjustable output voltage from 1.2V to 37V, operating from 8V–40V input, and achieving up to 94% efficiency in optimized designs. It integrates a 150mΩ DMOS high-side switch and supports external clock synchronization for EMI-sensitive communications equipment.
For engineers reviewing the LM2670SDX-ADJ/NOPB datasheet, LM2670SDX-ADJ/NOPB pinout, LM2670SDX-ADJ/NOPB application, or LM2670SDX-ADJ/NOPB equivalent, key selection criteria include its 260kHz internal oscillator, ±2% output voltage tolerance over line/load/temperature, 50µA shutdown quiescent current, SYNC pin compatibility with 280–400kHz external clocks, and TO-263-7 (KTW) thermal package suitability for industrial power conversion.
Technical Context
The LM2670SDX-ADJ/NOPB implements a fixed-frequency PWM buck controller with an integrated 150mΩ DMOS high-side switch, using voltage-mode control with internal compensation. Its feedback loop senses output voltage via the FB pin referenced to a precise 1.21V internal reference, enabling accurate regulation across the full 1.2V–37V range when configured with external resistor dividers.
It supports dual clocking modes: autonomous operation at 260kHz (±13.5kHz over temperature), or forced synchronization via the SYNC pin with external TTL/CMOS clocks from 280kHz to 400kHz - enabling deterministic ripple frequency placement and multi-rail phase alignment in systems like baseband radio supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3A continuous - supports industrial loads such as FPGA core rails or motor drivers without external current boosting. |
| Input voltage range | 8V to 40V - compatible with 12V/24V/36V industrial bus systems and battery-backed inputs. |
| Output voltage range | 1.2V to 37V (adjustable) - set via external resistor divider on FB pin; enables single-BOM flexibility across multiple system voltages. |
| Feedback reference | 1.21V ±1.7% - defines output accuracy; combined with ±0.5% resistor tolerance yields ≤±2% total VOUT tolerance over full conditions. |
| Switch RDS(on) | 0.15Ω typical - minimizes conduction loss at 3A, contributing directly to >90% efficiency at mid-load points. |
| Standby current | 50µA max - enables low-power sleep states in battery-powered gateways or remote sensors. |
| Oscillator frequency | 260kHz fixed (225–280kHz over temp) - balances inductor size, efficiency, and EMI; supports compact magnetics without excessive core loss. |
Pinout & Package
LM2670SDX-ADJ/NOPB is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package: 10.1mm × 15.24mm footprint with exposed thermal pad soldered to PCB ground plane for optimal heat dissipation in high-current applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Switch_output | High-side MOSFET drain node | Swings between VIN and ~–0.5V during off-time; connects directly to inductor and Schottky diode cathode - requires low-inductance layout to minimize ringing. |
| 2: Input | Main power supply input | Accepts 8–40V DC; must be bypassed with low-ESR capacitor placed <2mm from pin to suppress high-frequency switching noise. |
| 3: CBOOST/CB | Bootstrap capacitor connection | Drives high-side gate above VIN; requires 100nF ceramic capacitor between CB and Switch_output to sustain full RDS(on) performance. |
| 4: GND | Power ground reference | Primary return path for input/output capacitors and thermal pad; must connect to solid ground plane to limit noise coupling and ensure thermal stability. |
| 5: SYNC | External clock synchronization input | Accepts 280–400kHz TTL/CMOS signal; overrides internal oscillator to fix ripple frequency - critical for EMC compliance in comms modules. |
| 6: Feedback/FB | Voltage sense input | Compares divided output against 1.21V internal reference; sets regulated output via R1/R2 divider; sensitive to noise - route away from inductor and SW node. |
| 7: ON/OFF | Enable/disable control input | Logic-high (>1.4V) enables regulation; logic-low (<0.8V) forces 50µA standby mode - supports microcontroller-controlled power sequencing. |
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 (280–400kHz) | Enables precise ripple frequency control for consistent EMI filter design and multi-converter phase alignment in dense PCB layouts. |
| ±2% output voltage tolerance over line/load/temp | Guarantees stable rail delivery across industrial temperature range (–40°C to +125°C junction), reducing need for post-regulation trimming. |
| Thermal shutdown and current limiting | Protects against sustained overload or ambient overheating without external circuitry - latches off until reset by cycling ON/OFF pin. |
| WEBENCH® Power Designer support | Provides validated component selection, efficiency simulation, thermal analysis, and schematic generation - cuts design cycle from days to hours. |
Applications
| Industrial PLC Power Supply | Wireless Baseband Radio Supply |
|---|---|
Use Scenario: Provides clean, regulated 3.3V or 5V for FPGA I/O banks and ADC/DAC interfaces in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Primary buck converter delivering 3A continuous output; uses SYNC pin to lock switching frequency to system master clock for deterministic spectral positioning. Use Value: Eliminates need for discrete controller + MOSFET + gate driver, reducing board area by >40% while maintaining ±2% output accuracy across –40°C to +85°C ambient. | Use Scenario: Generates stable 12V intermediate rail for RF power amplifiers and analog front-end circuits in LTE/5G small cell radios. IC Role / Device Role / Timing Role: Preregulator stepping down 24V backplane to 12V; synchronized to 320kHz system clock to avoid interference with IF bands. Use Value: Achieves 94% efficiency at full load, reducing thermal load on densely packed RF modules and enabling fanless enclosure design. |
| Battery-Powered Test Equipment | Automated Test Fixture Power |
Use Scenario: Powers mixed-signal test head electronics (microcontroller, DACs, relays) from 12V sealed lead-acid or LiFePO₄ battery packs with runtime optimization. IC Role / Device Role / Timing Role: Adjustable-output buck regulator set to 2.5V/3.3V/5V per subsystem; ON/OFF pin controlled by host MCU for deep-sleep state entry. Use Value: 50µA shutdown current extends battery life significantly; wide 8–40V input accommodates battery voltage sag and charging transients without dropout. | Use Scenario: Supplies programmable 1.8V–12V rails to DUTs (devices under test) in automated functional test systems requiring fast voltage settling and low noise. IC Role / Device Role / Timing Role: Precision adjustable regulator with tight line/load regulation; FB pin routed with guard ring to reject noise from adjacent digital test signals. Use Value: ±2% output tolerance ensures measurement-grade accuracy; 260kHz fixed frequency simplifies output filter design versus variable-frequency alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671SDX-5.0/NOPB | Fixed 5V output; identical pinout, package, and 3A rating; lacks FB pin and adjustability. | Suitable only where 5V is required; eliminates resistor divider but removes voltage flexibility. | Select when fixed 5V simplifies BOM and layout - no rework needed if migrating from LM2670SDX-ADJ/NOPB in 5V-only designs. |
| TPS5430DDAR | 3A synchronous buck; 5.5–36V input; 0.8–36V output; 500kHz switching; smaller SO-8 package. | Higher frequency enables smaller inductors/caps but increases EMI sensitivity; no SYNC pin. | Prefer for space-constrained designs needing higher switching frequency; verify thermal performance at 3A in SO-8 vs. TO-263-7. |
Compared with LM2671SDX-5.0/NOPB, LM2670SDX-ADJ/NOPB provides full voltage adjustability at the cost of two external resistors; compared with TPS5430DDAR, it trades higher frequency and smaller footprint for superior thermal handling in continuous 3A operation and deterministic EMI control via SYNC.
Availability
LM2670SDX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation power supplies, wireless infrastructure converters, battery-powered instrumentation, and test equipment requiring stable component supply and long-term manufacturability.
Supply support for LM2670SDX-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 ease-of-use in non-isolated DC-DC buck applications where rapid design completion, thermal robustness, and field-proven reliability are prioritized over ultra-high frequency or digital control features.
FAQ
What is the maximum output voltage achievable with LM2670SDX-ADJ/NOPB?
The LM2670SDX-ADJ/NOPB supports an adjustable output voltage range from 1.2V to 37V, determined by the external resistor divider connected to the FB pin and referenced to its internal 1.21V precision bandgap. This range is valid across the full operating input voltage (8V–40V) and load (0–3A) conditions, with output accuracy maintained within ±2% over temperature and line variations.
Does LM2670SDX-ADJ/NOPB require an external Schottky diode?
Yes, LM2670SDX-ADJ/NOPB requires an external Schottky diode connected from the Switch_output pin (pin 1) to GND. The IC integrates only the high-side DMOS switch; the diode provides the freewheeling path during the switch-off period. TI recommends diodes with ≤0.5V forward voltage and sufficient current/thermal rating - e.g., 3A+ average current and 10A peak surge capability - to maintain efficiency and reliability.
Can LM2670SDX-ADJ/NOPB operate without connecting the SYNC pin?
Yes, LM2670SDX-ADJ/NOPB operates autonomously with its internal 260kHz oscillator when the SYNC pin is left unconnected or pulled to GND. The device defaults to internal clocking and delivers full functionality including regulation, current limiting, and thermal protection. External synchronization is optional and used only when deterministic ripple frequency or multi-converter phase alignment is required.
What thermal performance can be expected from LM2670SDX-ADJ/NOPB in the KTW package?
In the KTW (TO-263-7) package with proper PCB copper area (≥0.4896 in² of 1 oz copper), LM2670SDX-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 35°C/W. At 3A output and 12V input, typical power dissipation is ~1.2W, resulting in ~42°C junction rise above ambient - well within its –40°C to +125°C operating range when mounted on standard FR4 with thermal vias to inner ground planes.
How does the ON/OFF pin function in LM2670SDX-ADJ/NOPB?
The ON/OFF pin (pin 7) of LM2670SDX-ADJ/NOPB enables hardware-controlled startup and shutdown: applying ≥1.4V activates regulation, while ≤0.8V forces shutdown with 50µA standby current. The pin features an internal 20µA pull-up and 7V Zener clamp, allowing direct interface with 3.3V/5V logic or open-drain microcontroller outputs without level-shifting or external biasing components.
LM2670SDX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- 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:
- 14-VSON (5x6)
LM2670SDX-ADJ/NOPB FAQ
1.How can I place an order for LM2670SDX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SDX-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 LM2670SDX-ADJ/NOPB reliable?
The price and inventory of LM2670SDX-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 LM2670SDX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670SDX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SDX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SDX-ADJ/NOPB?
LM2670SDX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SDX-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 LM2670SDX-ADJ/NOPB?
For technical support, including LM2670SDX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SDX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2670SDX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670SDX-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 LM2670SDX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670SDX-ADJ/NOPB?
All LM2670SDX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SDX-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 LM2670SDX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2670SDX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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