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Texas Instruments LM2670SDX-12
- Part No.:
- LM2670SDX-12
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SDX-12.pdf
- Description:
- IC REG BUCK 12V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,778
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Product details
Overview
LM2670SDX-12 from Texas Instruments is a monolithic 3-A synchronous step-down (buck) DC/DC voltage regulator with fixed 12-V output, 8–40-V input range, 260-kHz internal oscillator, ±2% output tolerance, and 50-µA standby current in shutdown mode. It integrates a 150-mΩ DMOS high-side switch and supports external clock synchronization up to 400 kHz for EMI control in communications power supplies.
For engineers reviewing the LM2670SDX-12 datasheet, LM2670SDX-12 pinout, LM2670SDX-12 application, or LM2670SDX-12 equivalent, key selection criteria include its fixed 12-V output accuracy, thermal shutdown protection, ON/OFF enable control, and compatibility with standard off-the-shelf inductors and Schottky diodes in TO-263-7 (KTW) packaging.
Technical Context
The LM2670SDX-12 implements a current-mode PWM controller with an internal 260-kHz ramp oscillator and integrated 150-mΩ DMOS high-side switch. Its feedback loop uses a two-stage high-gain amplifier referenced to an internal 1.2-V bandgap, enabling precise regulation without external resistors for the fixed 12-V version.
It operates in continuous conduction mode (CCM) across 100 mA–3 A loads, features duty-cycle limiting (0–91%), and supports external synchronization via TTL/CMOS-compatible signals on the SYNC pin - disabling frequency foldback during sync operation but enabling consistent ripple spectrum positioning for RF-sensitive systems.
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 analog front-ends and digital logic without trimming. |
| Input Voltage Range | 8 V to 40 V - supports wide industrial and automotive battery-derived inputs including 12-V and 24-V nominal systems. |
| Max Output Current | 3 A continuous - delivers sufficient power for FPGA I/O banks, microcontroller cores, or sensor signal chains without external current boosting. |
| Switching Frequency | 260 kHz fixed internal oscillator (225–280 kHz over temp); externally synchronizable up to 400 kHz - enables predictable EMI filtering and avoids sensitive IF bands. |
| Efficiency | Up to 94% at VIN = 24 V, IOUT = 5 A - minimizes thermal load and improves system-level power density in enclosed enclosures. |
| Quiescent Current | 50 µA in shutdown (ON/OFF = low) - preserves battery life in always-on monitoring nodes or backup power paths. |
| RDS(ON) | 150 mΩ typical - reduces conduction loss and self-heating under full load, supporting TO-263 thermal performance up to 125°C ambient with minimal copper area. |
Pinout & Package
LM2670SDX-12 is packaged in TO-263-7 (KTW), a surface-mount thermally enhanced package with 10.10 mm × 8.89 mm body size and exposed thermal pad. The package supports high-power dissipation via PCB copper area and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS high-side switch - connects directly to inductor and Schottky diode cathode; carries high dv/dt switching waveform requiring tight layout. |
| 2 (VIN) | Input supply | Main power input (8–40 V); must be decoupled with low-ESR capacitor placed adjacent to pin to minimize high-frequency loop inductance. |
| 3 (CBOOST) | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to SW pin to generate gate drive voltage > VIN for full MOSFET enhancement and low RDS(ON). |
| 4 (GND) | Power ground | Primary return path for input capacitor, output capacitor, and internal circuitry - requires low-impedance connection to thermal pad and system ground plane. |
| 5 (SYNC) | External sync input | Accepts TTL/CMOS clock (280–400 kHz); overrides internal oscillator to fix ripple frequency - critical for coexistence with radio receivers or ADC sampling clocks. |
| 6 (FB) | Feedback sense | Internally tied to 12-V divider - connect directly to output capacitor for fixed-output operation; no external resistors required. |
| 7 (ON/OFF) | Enable control | Active-high logic input (1.4 V threshold); float or pull high to enable, pull ≤0.8 V to enter 50-µA shutdown - enables system-level power sequencing and sleep modes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150-mΩ DMOS switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity while maintaining >90% efficiency at 3 A. |
| ±2% output voltage tolerance | Guaranteed across full temperature and load range - removes need for post-regulation LDOs in precision analog subsystems powered from 12 V. |
| External clock synchronization | Enables deterministic placement of switching noise spectrum outside sensitive frequency bands (e.g., 2.4 GHz ISM, cellular bands), simplifying EMC compliance. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating without external circuitry - trips at ~160°C junction and limits peak switch current to 3.6–5.4 A. |
| 260-kHz fixed-frequency operation | Provides predictable component sizing (inductor/capacitor) and stable loop response - avoids subharmonic oscillation common in variable-frequency controllers. |
Applications
| Industrial PLC Power Supply | Automotive Infotainment Core Rail |
|---|---|
Use Scenario: Provides clean, regulated 12-V rail for programmable logic controller I/O modules operating in harsh factory environments with wide input voltage swings. IC Role / Device Role / Timing Role: Primary buck regulator converting unregulated 24-V vehicle or plant bus to stable 12-V supply for relay drivers and analog sensors. Use Value: ±2% output tolerance and –40°C to 125°C operation ensure reliable sensor excitation and DAC reference stability without recalibration across temperature extremes. | Use Scenario: Powers DSP and audio codec subsystems in head units where EMI from switching regulators must avoid interfering with AM/FM reception. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock domain to position switching harmonics away from broadcast bands. Use Value: External SYNC capability allows fixed 300-kHz operation - placing fundamental ripple and harmonics outside 530–1710 kHz AM band and enabling smaller EMI filters. |
| Battery-Powered Test Equipment | Telecom Line Card Preregulator |
Use Scenario: Supplies 12-V rail for portable oscilloscope front-end amplifiers and ADCs, requiring low quiescent current during standby and fast wake-up. IC Role / Device Role / Timing Role: Enable-controlled primary regulator that powers down to 50-µA standby when equipment enters sleep mode. Use Value: 50-µA shutdown current extends lithium-ion battery runtime by >20% in multi-day field deployments without sacrificing turn-on speed. | Use Scenario: Generates intermediate 12-V bus from 48-V telecom rectified input to feed downstream point-of-load converters for FPGAs and SERDES. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing heat generation in densely packed line cards with strict thermal budgets. Use Value: 94% peak efficiency at 24-V input reduces power dissipation by 1.8 W versus 85% alternatives - enabling fanless cooling in NEBS-compliant chassis. |
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-12 | Pin-compatible 3-A buck regulator with identical pinout and 12-V fixed output, but uses non-synchronous rectification (external diode required) and lacks SYNC input. | Lower cost where EMI control is not critical and board space allows external Schottky diode; unsuitable for sync-critical RF systems. | Select LM2671SD-12 only if SYNC functionality is unnecessary and thermal design accommodates higher diode conduction loss. |
| TPS5430DDAR | 3-A synchronous buck with adjustable output (0.8–35 V), 500-kHz switching, and integrated soft-start - no fixed 12-V variant; requires external feedback resistors. | Preferred when output voltage flexibility or faster transient response is needed; not drop-in for fixed 12-V designs due to different FB configuration and pinout. | Choose TPS5430DDAR only when adjustable output or higher switching frequency justifies redesigning feedback network and layout. |
Compared with LM2671SD-12, LM2670SDX-12 offers superior efficiency via synchronous rectification and essential SYNC capability for EMI-sensitive applications; versus TPS5430DDAR, it provides true plug-and-play 12-V operation without resistor networks or soft-start tuning, simplifying qualification in industrial and automotive programs.
Availability
LM2670SDX-12 is available at Aetrix Electronics and suitable for industrial automation power supplies, automotive infotainment systems, and telecom line card preregulators requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LM2670SDX-12 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers needing robust, easy-to-implement DC/DC conversion with minimal external components and proven reliability in harsh environments.
FAQ
What is the maximum input voltage rating for LM2670SDX-12?
The absolute maximum input voltage for LM2670SDX-12 is 45 V, but the recommended operating range is 8 V to 40 V per the datasheet. Exceeding 40 V continuously risks violating thermal limits and degrading long-term reliability, especially at high ambient temperatures. The device includes internal protection against overvoltage stress on the VIN pin, but sustained operation above 40 V is not characterized or guaranteed. Always verify input transient suppression in automotive or industrial applications where load-dump events may occur.
Does LM2670SDX-12 require external compensation components?
No, LM2670SDX-12 does not require external compensation components. Its internal control loop is fully compensated for stable operation with standard external inductors and output capacitors specified in the datasheet. The fixed 260-kHz switching frequency and optimized internal transconductance amplifier eliminate the need for external RC networks or type-II/type-III compensators - a key advantage of the SIMPLE SWITCHER® architecture that reduces design iteration time and layout sensitivity.
Can LM2670SDX-12 operate without the CBOOST capacitor?
No, LM2670SDX-12 cannot operate reliably without the CBOOST capacitor. This 100-nF ceramic capacitor between pins 3 (CBOOST) and 1 (SW) is essential to generate the gate drive voltage required to fully enhance the internal DMOS high-side switch. Omitting it results in insufficient gate voltage, increased RDS(ON), excessive heating, and potential thermal shutdown or catastrophic failure under load. TI specifies X7R or C0G dielectric types with low ESR and tight tolerance to ensure robust bootstrapping across temperature.
What is the thermal performance of LM2670SDX-12 in the TO-263-7 package?
In the TO-263-7 (KTW) package, LM2670SDX-12 achieves a junction-to-ambient thermal resistance (RθJA) of 26°C/W with 0.4896 in² (3.6× package area) of 1 oz copper on the PCB, and 35°C/W with 0.136 in² (equal to package area). These values assume proper soldering of the thermal pad to the copper plane. At 3 A output and 24-V input, typical power dissipation is ~1.2 W - resulting in ~31°C junction rise above ambient with 35°C/W, well within the –40°C to 125°C operating range. Thermal derating begins above 85°C ambient.
Is LM2670SDX-12 compatible with lead-free reflow profiles?
Yes, LM2670SDX-12 is qualified for lead-free reflow soldering per JEDEC J-STD-020. The TO-263-7 package supports peak reflow temperatures up to 260°C for 4 seconds (wave soldering) and 240°C for 10 seconds (infrared), matching standard Pb-free process requirements. TI specifies moisture sensitivity level (MSL) 3 for this device, requiring bake-out if exposed to ambient for >168 hours before reflow. The package uses matte tin lead finish and meets IPC/JEDEC standards for intermetallic formation and solder joint integrity.
LM2670SDX-12 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:
- 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:
- 14-VSON (5x6)
LM2670SDX-12 FAQ
1.How can I place an order for LM2670SDX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SDX-12 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-12 reliable?
The price and inventory of LM2670SDX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670SDX-12 is usually 5 days.
3.What payment methods are accepted for LM2670SDX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SDX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SDX-12?
LM2670SDX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SDX-12 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-12?
For technical support, including LM2670SDX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SDX-12 requirements.
6.How does Aetrix verify that LM2670SDX-12 is sourced from the original manufacturer or authorized distributors?
All LM2670SDX-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2670SDX-12?
All LM2670SDX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SDX-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2670SDX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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