My Inquiry
My Account
Texas Instruments LM2670SD-12
- Part No.:
- LM2670SD-12
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SD-12.pdf
- Description:
- IC REG BUCK 12V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,233
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2670SD-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 over line/load/temperature, and 50-µA standby current in shutdown mode - used in communications equipment power supplies requiring stable, synchronized ripple control.
For engineers reviewing the LM2670SD-12 datasheet, LM2670SD-12 pinout, LM2670SD-12 application, or LM2670SD-12 equivalent, key selection criteria include its fixed 12-V output, TO-263-7 (KTW) package thermal performance, external sync capability (280–400 kHz), 150-mΩ high-side DMOS switch, and ON/OFF control interface for system-level power sequencing.
Technical Context
The LM2670SD-12 implements a current-mode PWM buck controller with an integrated 150-mΩ high-side DMOS switch and bootstrap gate drive (CBOOST required). It operates in continuous conduction mode up to 3 A load and supports external synchronization above 280 kHz to fix ripple frequency for EMI-sensitive radio applications.
Its feedback loop uses an internal resistor divider for fixed 12-V output, eliminating external resistors; regulation accuracy is maintained at ±2% across –40°C to 125°C junction temperature, 8–40-V input, and 100 mA–5 A load. Thermal shutdown, cycle-by-cycle current limiting (3.6–5.4 A), and 94% peak efficiency at 24-VIN/12-VOUT/5-A are built-in.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12 V ±2% over full line, load, and –40°C to 125°C junction temperature - ensures stable rail for downstream analog/RF circuitry without trimming. |
| Input voltage range | 8 V to 40 V - supports wide industrial and telecom input sources including 12-V, 24-V, and 36-V battery or rectified bus rails. |
| Switching frequency | 260 kHz internal oscillator (225–280 kHz over temp); externally synchronizable to 280–400 kHz - enables precise EMI filtering and spectrum positioning. |
| Max output current | 3 A continuous - delivers sufficient power for FPGA I/O banks, RF power amplifiers, or multi-rail subsystems without external current boosting. |
| Efficiency | Up to 94% at 24-VIN, 12-VOUT, 5-A load - reduces thermal load and improves system power density versus linear regulators. |
| Standby current | 50 µA typical when ON/OFF pin < 0.8 V - enables low-power sleep modes in battery-backed or always-on communication systems. |
| High-side RDS(ON) | 0.15 Ω typical at TJ = 25°C - minimizes conduction loss and self-heating under full load in TO-263-7 package. |
Pinout & Package
LM2670SD-12 is packaged in TO-263-7 (KTW) - a thermally enhanced surface-mount variant of the DDPAK with exposed thermal pad, 10.10 mm × 8.89 mm body size, and 26°C/W typical RθJA with 0.4896 in² copper pour per TI datasheet.
| 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 - must be routed with minimal loop area for EMI control. |
| 2 (VIN) | Input supply | Main power input (8–40 V); requires low-ESR ceramic bypass capacitor placed adjacent to pin - path to GND must be shortest possible. |
| 3 (CBOOST) | Bootstrap capacitor | Connects 100-nF ceramic capacitor to SW pin; provides gate drive voltage > VIN to fully enhance high-side FET - critical for low RDS(ON) operation. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and internal circuitry; must tie to large PCB ground plane - shared with thermal pad for heat dissipation. |
| 5 (SYNC) | Sync clock input | Accepts TTL/CMOS external clock ≥280 kHz; overrides internal oscillator to lock ripple frequency - used for EMI compliance in radios and transceivers. |
| 6 (FB) | Feedback input | Internally tied to 12-V divider; connect directly to output capacitor - no external resistors needed; sensitive to noise - keep trace short and away from SW node. |
| 7 (ON/OFF) | Enable control | Logic-level enable: >1.4 V = active, <0.8 V = shutdown (50 µA IQ); internal 20-µA pull-up - allows microcontroller or PMIC to sequence power. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology | Integrated high-side DMOS switch eliminates need for external flyback diode - reduces BOM count and improves efficiency by ~3–5% vs nonsynchronous designs. |
| Fixed 12-V output | No external feedback resistors required - simplifies layout, eliminates resistor tolerance drift, and guarantees ±2% regulation without calibration. |
| External sync capability | Enables deterministic switching frequency placement between 280–400 kHz - essential for meeting narrowband EMI limits in FCC Part 15 Class B comms gear. |
| Thermal protection | Internal thermal shutdown activates at ~165°C junction temperature - prevents damage during overload or poor heatsinking; auto-recovery on cooldown. |
| Current limit foldback | Reduces switch duty cycle under overcurrent to limit power dissipation - maintains safe SOA during short-circuit events without latch-off. |
Applications
| Communications Power Supply | Battery Charger Pre-regulator |
|---|---|
Use Scenario: 24-V telecom rectifier powering 12-V RF front-end modules in base station radios. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, low-noise 12-V rail with externally synchronized switching to avoid interference with adjacent receive bands. Use Value: 94% efficiency at 5-A load minimizes heat in dense RF chassis; SYNC pin locks ripple to 350 kHz for predictable filter design and repeatable EMC test results. |
Use Scenario: 36-V Li-ion battery pack charging system using 12-V intermediate bus for USB-PD or auxiliary loads. IC Role / Device Role / Timing Role: High-current preregulator stepping down variable battery voltage to stable 12-V bus before linear post-regulation or DC-DC conversion. Use Value: 8–40-V input range accommodates full battery discharge curve; 3-A capability supports fast-charging auxiliary rails without derating. |
| Industrial Control I/O Module | Embedded Computing Power |
Use Scenario: DIN-rail mounted PLC I/O module requiring isolated 12-V logic and sensor power from unregulated 24-V field supply. IC Role / Device Role / Timing Role: Non-isolated buck converter providing robust, thermally efficient 12-V supply tolerant of industrial voltage transients and ambient temperatures up to 85°C. Use Value: Built-in current limit and thermal shutdown protect against wiring faults; TO-263-7 package enables direct heatsink mounting for extended life in sealed enclosures. |
Use Scenario: Single-board computer with FPGA, DDR memory, and peripherals needing tightly regulated 12-V auxiliary rail from 24-V system bus. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supplying FPGA I/O banks and clock buffers with low-output-impedance 12-V source. Use Value: ±2% output tolerance ensures reliable logic-level compatibility; 50-µA shutdown current enables deep-sleep states without auxiliary LDOs. |
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 | Same pinout, 1-A output rating, lower current limit (1.8–2.3 A), identical 12-V fixed output and SYNC capability. | Suitable only for sub-1.5-A loads; lower thermal mass and RDS(ON) mismatch reduce efficiency above 1 A. | Select LM2671SD-12 only when load current ≤1 A and board space/thermal budget is constrained. |
| TPS54302DDAR | 3-A synchronous buck, 4.5–28-V input, adjustable output (0.6–5.5 V), no fixed 12-V version; requires external feedback resistors. | Cannot replace LM2670SD-12 without redesigning feedback network and verifying stability at 12 V; lacks SYNC pin. | Choose TPS54302DDAR only for new designs requiring adjustable output or lower input voltage - not a drop-in alternative. |
Compared with LM2670SD-12, LM2671SD-12 offers identical functionality at reduced current capacity, while TPS54302DDAR provides higher integration but requires full schematic and layout revision to achieve 12-V output - neither is pin-compatible nor functionally interchangeable without validation.
Availability
LM2670SD-12 is available at Aetrix Electronics and suitable for communications infrastructure, industrial control I/O modules, and embedded computing power supplies requiring stable component supply, long-term lifecycle support, and consistent thermal performance in TO-263-7 packaging.
Supply support for LM2670SD-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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for engineers seeking easy-to-use, high-efficiency DC/DC buck regulators that minimize external component count and accelerate time-to-market for industrial and communications power systems.
FAQ
What is the maximum input voltage rating for LM2670SD-12?
The absolute maximum input voltage for LM2670SD-12 is 45 V, but the recommended operating range is 8 V to 40 V per TI SNVS036K datasheet. Operation above 40 V risks exceeding safe SOA limits and may trigger internal protection circuits. For sustained reliability, maintain VIN ≤40 V with appropriate derating margins for transients.
Does LM2670SD-12 require an external bootstrap capacitor?
Yes, LM2670SD-12 requires a 100-nF ceramic capacitor connected between the CBOOST pin (pin 3) and the SW pin (pin 1). This capacitor enables proper gate drive voltage for the internal high-side DMOS switch. Omitting it causes insufficient gate enhancement, increased RDS(ON), and potential thermal failure under load.
Can LM2670SD-12 be synchronized to an external clock?
Yes, LM2670SD-12 supports external synchronization via the SYNC pin (pin 5). An external TTL/CMOS clock signal between 280 kHz and 400 kHz can override the internal 260-kHz oscillator. This feature is used to align switching frequency for EMI control - but disables current-limit foldback during sync operation.
What is the thermal resistance (RθJA) of LM2670SD-12 in its TO-263-7 package?
In the TO-263-7 (KTW) package, LM2670SD-12 has a typical junction-to-ambient thermal resistance of 35°C/W with 0.4896 in² (3.6× package area) of 1-oz copper, and 26°C/W with 1.0064 in² (7.4× package area) per TI SNVS036K. The exposed thermal pad must be soldered to PCB copper for these values to apply.
Is LM2670SD-12 RoHS compliant and lead-free?
Yes, LM2670SD-12 is RoHS compliant and lead-free per TI's official product change notices and packaging data. The TO-263-7 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements for standard SMT assembly processes.
LM2670SD-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)
LM2670SD-12 FAQ
1.How can I place an order for LM2670SD-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SD-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 LM2670SD-12 reliable?
The price and inventory of LM2670SD-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670SD-12 is usually 5 days.
3.What payment methods are accepted for LM2670SD-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SD-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SD-12?
LM2670SD-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SD-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 LM2670SD-12?
For technical support, including LM2670SD-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SD-12 requirements.
6.How does Aetrix verify that LM2670SD-12 is sourced from the original manufacturer or authorized distributors?
All LM2670SD-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 LM2670SD-12 meets industry standards.
7.What is the process for return or replacement of LM2670SD-12?
All LM2670SD-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SD-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 LM2670SD-12 part is unused and in its original packaging.
Return procedure for LM2670SD-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2670SD-12 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…
