My Inquiry
My Account
Texas Instruments LM2670S-12
- Part No.:
- LM2670S-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670S-12.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2670S-12 from Texas Instruments is a monolithic 3-A 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 150-mΩ DMOS high-side switch - used in communications equipment power supplies requiring synchronized ripple control.
For engineers reviewing the LM2670S-12 datasheet, LM2670S-12 pinout, LM2670S-12 application, or LM2670S-12 equivalent, key selection criteria include its 12-V fixed output accuracy, external sync capability (280–400 kHz), 50-µA shutdown current, thermal shutdown protection, and TO-263-7 package suitability for high-current industrial power conversion.
Technical Context
The LM2670S-12 implements a current-mode PWM buck controller with an integrated 150-mΩ DMOS high-side switch and internal 260-kHz oscillator. It supports external synchronization above 280 kHz to fix switching frequency and stabilize output ripple spectrum - critical for EMI-sensitive radio and comms systems.
Its feedback loop uses a two-stage high-gain amplifier referenced to an internal 1.2-V bandgap; for the fixed 12-V version, FB pin connects directly to VOUT without external resistors. Shutdown is controlled via ON/OFF pin with 1.4-V threshold and 50-µA standby current.
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 downstream analog/RF circuitry. |
| Input Voltage Range | 8 V to 40 V - supports wide-range industrial, automotive, and telecom inputs without pre-regulation. |
| Max Output Current | 3 A continuous - delivers sufficient power for mid-power subsystems like RF front-ends or FPGA I/O banks. |
| Switching Frequency | 260 kHz internal oscillator (225–280 kHz over temp); externally synchronizable up to 400 kHz - enables consistent EMI filtering and spectral placement. |
| Efficiency | Up to 94% at VIN = 24 V, IOUT = 5 A - minimizes thermal load and improves system-level power density. |
| RDS(ON) | 150 mΩ typical - reduces conduction loss and enables high efficiency without external MOSFETs. |
| Shutdown Current | 50 µA max - enables low-power standby modes in battery-backed or energy-conscious systems. |
| Thermal Protection | Integrated thermal shutdown - prevents damage during overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
LM2670S-12 is packaged in TO-263-7 (DDPAK), a thermally enhanced surface-mount package with 10.10 mm × 8.89 mm body size and exposed thermal pad for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET - connects to inductor and Schottky diode cathode; switches between VIN and ~–0.5 V during off-time. |
| 2 (VIN) | Input supply | Main power input (8–40 V); supplies both load path and internal bias - requires low-ESR bypass capacitor placed adjacent to pin. |
| 3 (CBOOST) | Bootstrap capacitor | Connects to SW pin via 100-nF ceramic capacitor - generates gate drive voltage > VIN to fully enhance internal FET and minimize RDS(ON). |
| 4 (GND) | Power ground | Common return for VIN bypass, output capacitor, and internal circuitry - must be tied to low-impedance ground plane. |
| 5 (SYNC) | Sync clock input | Accepts external TTL/CMOS clock (280–400 kHz); overrides internal oscillator to lock ripple frequency - essential for EMI compliance in comms gear. |
| 6 (FB) | Feedback input | Direct connection to 12-V output (no resistor divider needed); senses regulated voltage via internal 1.2-V reference amplifier. |
| 7 (ON/OFF) | Enable control | Logic-level enable: ≥1.4 V = active, ≤0.8 V = shutdown; internal 20-µA pull-up - allows microcontroller or PMIC to sequence power rails. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors - reduces BOM count, layout area, and calibration drift in production. |
| External sync capability | Enables precise ripple frequency positioning across multiple converters - simplifies EMI filter design and avoids beat frequencies in multi-rail systems. |
| 150-mΩ DMOS switch | Integrates power stage without discrete MOSFETs or drivers - cuts solution size and improves reliability vs. controller+MOSFET alternatives. |
| 50-µA shutdown current | Supports ultra-low-power sleep states in portable or always-on equipment - extends battery life or reduces standby losses. |
| Thermal shutdown + current limit | Provides autonomous fault protection without external monitoring - safeguards against short-circuit, overtemp, or overload in unattended operation. |
| –40°C to 125°C operation | Rated for industrial and extended-temperature environments - suitable for under-hood automotive, base station, or factory automation applications. |
Applications
| Communications Power Supply | Battery Charger Pre-Regulator |
|---|---|
|
Use Scenario: Primary DC/DC conversion in 24-V powered radio transceivers and baseband modules. IC Role / Device Role / Timing Role: Step-down regulator delivering clean, stable 12-V rail to RF amplifiers and ADC/DAC sections. Use Value: External SYNC input locks switching frequency to system clock domain - suppresses heterodyne noise and enables deterministic EMI filtering. |
Use Scenario: Intermediate regulation stage before linear charging ICs in 12-V lead-acid or LiFePO₄ battery chargers. IC Role / Device Role / Timing Role: High-efficiency preregulator reducing voltage differential across linear charger - minimizing heat dissipation. Use Value: 94% peak efficiency at 24-V input/12-V output lowers thermal stress on downstream LDOs and improves overall charger efficiency. |
| Industrial Control System PSU | Test & Measurement Equipment |
|
Use Scenario: Distributed 12-V power for PLC I/O modules, sensors, and fieldbus interfaces operating from 24-V DC bus. IC Role / Device Role / Timing Role: Robust, self-protected buck converter handling wide input transients and ambient temperature swings. Use Value: Integrated thermal shutdown and current limiting ensure safe operation during short circuits or overheating in sealed enclosures. |
Use Scenario: Precision 12-V supply for analog front-ends, reference buffers, and signal chain components in benchtop instruments. IC Role / Device Role / Timing Role: Low-noise, tightly regulated source with minimal output ripple due to fixed-frequency operation and stable feedback loop. Use Value: ±2% output tolerance over full temperature and load range maintains measurement accuracy without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671-12 | Same 12-V fixed output but 3-A rating limited to 8–30-V input; no SYNC pin; lower max input voltage. | Suitable only where input stays below 30 V; lacks frequency synchronization for EMI-critical designs. | Select LM2671-12 only if input voltage never exceeds 30 V and sync is unnecessary. |
| LM2596-12 | 3-A buck regulator with 12-V fixed output, 4.5–40-V input, but 150-kHz fixed frequency and no SYNC capability. | Lower switching frequency increases inductor/capacitor size; no ripple frequency control - less suitable for compact or EMI-sensitive layouts. | Choose LM2596-12 when cost is primary concern and board space/EMI are not constrained. |
Compared with LM2671-12 and LM2596-12, the LM2670S-12 uniquely combines 40-V input support, 260-kHz base frequency, and external SYNC - making it the only option among the three that enables repeatable EMI performance in synchronized multi-converter systems.
Availability
LM2670S-12 is available at Aetrix Electronics and suitable for industrial control systems, communications infrastructure, battery-powered test equipment, and automotive auxiliary power supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2670S-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 needing robust, easy-to-implement DC/DC regulators with minimal external components and proven thermal performance in demanding environments.
FAQ
What is the maximum input voltage rating for the LM2670S-12?
The LM2670S-12 has an absolute maximum input voltage rating of 45 V, with recommended operation from 8 V to 40 V. Exceeding 40 V continuously risks exceeding thermal limits or degrading long-term reliability, even if within absolute max ratings - design margin should maintain VIN ≤ 40 V under all operating conditions including transients.
Does the LM2670S-12 require external feedback resistors for 12-V output?
No - the LM2670S-12 is a fixed-output variant, so internal resistor dividers set the 12-V regulation point. The FB pin must be connected directly to the output capacitor; adding external resistors will disrupt regulation and cause overvoltage. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy.
Can the LM2670S-12 synchronize to an external clock, and what are the requirements?
Yes, the LM2670S-12 accepts external synchronization on the SYNC pin (Pin 5) from 280 kHz to 400 kHz. The signal must be TTL- or CMOS-compatible (0–>3 V), AC-coupled via a 100-pF capacitor and 1-kΩ pull-down resistor. Frequencies below 280 kHz may cause erratic operation due to internal oscillator interference.
What thermal considerations apply to the LM2670S-12 in TO-263-7 package?
In TO-263-7 (KTW) package, the LM2670S-12 achieves θJA = 26°C/W with 7.4× paddle copper area and vias to inner layers. For reliable 3-A operation at 40-V input, a minimum 1.0 in² (6.5 cm²) 1-oz copper pour tied to the thermal pad is required. Without adequate copper, junction temperature may exceed 125°C even at moderate loads.
How does the ON/OFF pin function, and what happens in shutdown mode?
The ON/OFF pin (Pin 7) enables or disables the LM2670S-12: ≥1.4 V activates regulation; ≤0.8 V forces shutdown with 50-µA quiescent current. During shutdown, the internal switch turns off, FB and SYNC are inactive, and output discharges through the catch diode. The pin has a 20-µA internal pull-up, so floating defaults to ON - no external pull-up needed.
LM2670S-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- 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:
- TO-263 (DDPAK-7)
LM2670S-12 FAQ
1.How can I place an order for LM2670S-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670S-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 LM2670S-12 reliable?
The price and inventory of LM2670S-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2670S-12 is usually 5 days.
3.What payment methods are accepted for LM2670S-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670S-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670S-12?
LM2670S-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670S-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 LM2670S-12?
For technical support, including LM2670S-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670S-12 requirements.
6.How does Aetrix verify that LM2670S-12 is sourced from the original manufacturer or authorized distributors?
All LM2670S-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 LM2670S-12 meets industry standards.
7.What is the process for return or replacement of LM2670S-12?
All LM2670S-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2670S-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 LM2670S-12 part is unused and in its original packaging.
Return procedure for LM2670S-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2670S-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…
