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Texas Instruments LM2670SD-ADJ
- Part No.:
- LM2670SD-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SD-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,929
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Product details
Overview
LM2670SD-ADJ from Texas Instruments is a monolithic step-down (buck) DC-DC voltage regulator IC delivering up to 3 A output current, featuring an internal 150-mΩ DMOS high-side switch, adjustable output voltage range of 1.2 V to 37 V, 260-kHz fixed-frequency PWM control, and ±2% output voltage tolerance over line, load, and temperature (–40°C to 125°C). It enables compact, high-efficiency (>90%) power conversion in industrial and communications equipment where wide-input (8 V–40 V) operation and external synchronization are required.
For engineers reviewing the LM2670SD-ADJ datasheet, LM2670SD-ADJ pinout, LM2670SD-ADJ application, or LM2670SD-ADJ equivalent, key selection criteria include its adjustable output capability, SYNC pin support for ripple frequency control, thermal shutdown and current limiting protection, low 50-µA standby current in shutdown mode, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2670SD-ADJ implements a voltage-mode PWM controller with a fixed 260-kHz internal oscillator and optional external synchronization (280–400 kHz), enabling precise ripple frequency positioning for EMI-sensitive applications. Its integrated high-side DMOS switch eliminates external MOSFET drive complexity while maintaining efficiency up to 94% at full load.
Feedback regulation uses a two-stage high-gain amplifier referenced to an internal 1.2-V bandgap, requiring only two external resistors for output setting. The ON/OFF pin provides TTL/CMOS-compatible enable control with 1.4-V threshold and 20-µA input bias current, supporting low-power system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Up to 3 A continuous; supports high-current industrial loads without external current boosting. |
| Input voltage range | 8 V to 40 V; accommodates unregulated 12-V, 24-V, and 36-V bus systems with margin. |
| Output voltage range | 1.2 V to 37 V (adjustable); set via external resistor divider on FB pin - no fixed-voltage limitation. |
| Switching frequency | 260 kHz (internal fixed); externally synchronizable to 280–400 kHz for consistent EMI filtering. |
| Output voltage accuracy | ±2% over full line, load, and temperature (–40°C to 125°C); ensures stable regulation in harsh environments. |
| Quiescent current (active) | 6 mA typical; enables efficient light-load operation without burst-mode instability. |
| Standby current | 50 µA max when ON/OFF pin < 0.8 V; supports ultra-low-power system sleep states. |
| RDS(ON) | 0.15 Ω typical; minimizes conduction loss and thermal rise at 3-A load. |
Pinout & Package
The LM2670SD-ADJ is packaged in a 14-pin VSON (NHM) package measuring 6.00 mm × 5.00 mm with exposed thermal pad (DAP), optimized for high-power density and thermal performance in space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 14 | Switch_output | High-side DMOS drain node; connects directly to inductor and Schottky cathode - critical high-dI/dt switching node requiring short, low-inductance routing. |
| 2, 3 | Input | Main power input (8–40 V); must be decoupled with low-ESR capacitor placed adjacent to pins to minimize input ripple and noise coupling. |
| 4 | CBOOST/CB | Bootstrap capacitor connection (100 nF recommended); supplies gate drive voltage > VIN to fully enhance internal high-side MOSFET. |
| 9 | GND | Power ground reference; DAP (thermal pad) must be soldered to PCB ground plane for thermal and electrical integrity. |
| 6 | Feedback/FB | Resistor-divider feedback input; senses output voltage and compares to internal 1.2-V reference to regulate adjustable output. |
| 8 | ON/OFF | Enable control input; logic-high (>1.4 V) enables regulation; logic-low (<0.8 V) disables output and reduces supply current to 50 µA. |
| 5 | SYNC | External clock synchronization input; accepts TTL/CMOS signal >280 kHz to lock switching frequency and position ripple spectrum. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150-mΩ DMOS high-side switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity while sustaining 3-A output. |
| Adjustable output (1.2 V–37 V) | Supports custom rail generation across diverse subsystems using only two external resistors - no fixed-output constraint. |
| External SYNC capability (280–400 kHz) | Enables deterministic ripple frequency placement for compliance with narrowband EMI limits in radio and comms equipment. |
| ±2% output tolerance over –40°C to 125°C | Guarantees stable voltage delivery in automotive under-hood, industrial motor control, and outdoor embedded applications. |
| 50-µA shutdown quiescent current | Meets stringent system-level standby power budgets in battery-backed or energy-harvesting designs. |
| Built-in thermal shutdown & current limiting | Provides autonomous fault protection without external circuitry - prevents damage during overload or ambient overheating. |
Applications
| Industrial Motor Drive Power Supply | Telecom Line Card DC-DC Converter |
|---|---|
|
Use Scenario: Provides isolated 5-V or 12-V auxiliary power for gate drivers, sensors, and microcontrollers in variable-frequency drives operating from 24-V or 48-V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator generating stable intermediate rail; uses SYNC pin to align switching frequency with system clock domain and avoid beat frequencies. Use Value: Delivers 3-A output with 94% efficiency at 24-V input, minimizing heat sink requirements and enabling convection-cooled enclosure design. |
Use Scenario: Generates 3.3-V or adjustable low-noise supply for FPGA I/O banks and SerDes transceivers on telecom line cards powered from –48-V or +24-V backplane. IC Role / Device Role / Timing Role: Pre-regulator stepping down high-input voltage before LDO post-regulation; SYNC input allows ripple frequency coordination with data transmission timing. Use Value: Adjustable output supports multiple voltage standards (e.g., 1.8 V, 2.5 V, 3.3 V) across card variants using same PCB footprint and BOM. |
| Portable Test Equipment Battery Charger | Automotive Infotainment System Power |
|
Use Scenario: Charges 3-cell Li-ion battery packs (12.6 V max) from 19-V laptop-style adapters, with programmable constant-current/constant-voltage profile. IC Role / Device Role / Timing Role: Constant-current buck controller interfaced with external op-amp and sense resistor; FB pin used for precision current regulation loop. Use Value: Wide 8–40-V input range accommodates adapter tolerances and transient surges; ±2% accuracy ensures safe battery termination voltage. |
Use Scenario: Supplies 5-V and 3.3-V rails for head unit processors, display controllers, and audio codecs in vehicles with 9–16-V battery input and load-dump transients. IC Role / Device Role / Timing Role: Main DC-DC converter handling cold-crank (6.5 V) to load-dump (40 V) conditions; thermal shutdown protects against under-dash ambient extremes. Use Value: 125°C junction rating and robust 40-V absolute max input ensure reliable operation across automotive temperature and stress profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671SD-ADJ | 260-kHz fixed frequency only; no SYNC pin; identical pinout and FB architecture. | Lacks external clock synchronization - unsuitable where EMI spectral control is mandatory. | Select when SYNC functionality is unnecessary and cost reduction is prioritized. |
| TPS54302DDAR | 3-A synchronous buck with integrated high- and low-side MOSFETs; 500-kHz default frequency; no CBOOST requirement. | Higher efficiency at light loads due to synchronous rectification; smaller solution size but different pinout and compensation. | Choose for improved light-load efficiency and reduced external component count where board redesign is acceptable. |
Compared with LM2671SD-ADJ, the LM2670SD-ADJ adds critical SYNC capability for EMI management; versus TPS54302DDAR, it retains the bootstrap architecture enabling higher VIN operation (40 V vs. 28 V) and simpler gate drive, at the cost of slightly lower light-load efficiency.
Availability
LM2670SD-ADJ is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, portable test equipment, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2670SD-ADJ 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, minimal external component count, and robust performance in industrial, communications, and automotive power supply applications.
FAQ
What is the maximum input voltage rating for the LM2670SD-ADJ?
The LM2670SD-ADJ has an absolute maximum input voltage rating of 45 V, with recommended operating range from 8 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection circuits. The 40-V upper limit ensures reliable long-term performance under transient conditions including load dump in automotive environments.
How does the SYNC pin function in the LM2670SD-ADJ?
The SYNC pin on the LM2670SD-ADJ accepts an external TTL/CMOS clock signal between 280 kHz and 400 kHz to override the internal 260-kHz oscillator. This forces deterministic switching frequency alignment, enabling precise output ripple spectrum positioning - essential for meeting narrowband EMI requirements in radio and communications equipment. When SYNC is active, current-limit foldback is disabled.
What is the purpose of the CBOOST/CB pin on the LM2670SD-ADJ?
The CBOOST/CB pin on the LM2670SD-ADJ connects to a 100-nF ceramic capacitor tied to the Switch_output pin, forming a charge pump that generates a gate drive voltage ~VIN + 10 V. This ensures full enhancement of the internal high-side DMOS switch, minimizing RDS(ON) and conduction losses - critical for sustaining 3-A output with high efficiency across the full input range.
Can the LM2670SD-ADJ operate in dropout mode when input voltage approaches output voltage?
No - the LM2670SD-ADJ is a non-synchronous buck regulator requiring sufficient input-to-output differential to maintain regulation. Minimum duty cycle is 0%, but practical dropout is limited by internal oscillator timing and minimum on-time. At very low VIN–VOUT differentials (e.g., VIN < 1.5×VOUT), regulation degrades and current limit may activate. It is not designed for linear or LDO-like operation.
What thermal considerations apply to the LM2670SD-ADJ in VSON (NHM) package?
The LM2670SD-ADJ in the 14-pin VSON (NHM) package achieves a junction-to-ambient thermal resistance (RθJA) of 29°C/W with 12 vias to a second-layer copper plane. To maintain ≤125°C junction temperature at 3-A load, PCB layout must connect the exposed thermal pad (DAP) directly to a solid ground plane with ≥12 thermal vias (0.3-mm diameter), and minimize trace length between Input, GND, and Switch_output pins.
LM2670SD-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
LM2670SD-ADJ FAQ
1.How can I place an order for LM2670SD-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SD-ADJ 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 LM2670SD-ADJ reliable?
The price and inventory of LM2670SD-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670SD-ADJ is usually 5 days.
3.What payment methods are accepted for LM2670SD-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SD-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SD-ADJ?
LM2670SD-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SD-ADJ 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 LM2670SD-ADJ?
For technical support, including LM2670SD-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SD-ADJ requirements.
6.How does Aetrix verify that LM2670SD-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2670SD-ADJ 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 LM2670SD-ADJ meets industry standards.
7.What is the process for return or replacement of LM2670SD-ADJ?
All LM2670SD-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SD-ADJ, 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 LM2670SD-ADJ part is unused and in its original packaging.
Return procedure for LM2670SD-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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