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Texas Instruments LM2670SD-12/NOPB
- Part No.:
- LM2670SD-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2670SD-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
LM2670SD-12/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3 A output current with fixed 12 V output, 8–40 V input range, 260 kHz internal oscillator, ±2% output voltage tolerance, and 94% peak efficiency at 24 VIN/3 A. It integrates a 150 mΩ DMOS high-side switch and supports external synchronization for EMI control in communications power supplies.
For engineers reviewing the LM2670SD-12/NOPB datasheet, LM2670SD-12/NOPB pinout, LM2670SD-12/NOPB application, or LM2670SD-12/NOPB equivalent, key selection criteria include its fixed 12 V output configuration, TO-263-7 (KTW) thermal package, SYNC pin compatibility with 280–400 kHz external clocks, ON/OFF enable logic, and feedback pin bypass requirement for fixed-output operation.
Technical Context
The LM2670SD-12/NOPB implements a voltage-mode PWM controller with an internal 260 kHz ramp oscillator and comparator-based regulation loop. Its fixed 12 V output eliminates external feedback resistors, simplifying layout and improving accuracy over temperature (±2% from –40°C to 125°C).
It uses a bootstrap-gated N-channel DMOS high-side switch (RDS(ON) = 0.15 Ω typ.) driven by a charge-pump circuit tied to the CBOOST pin. The SYNC pin accepts TTL/CMOS-compatible external clocks above 280 kHz to override the internal oscillator-enabling precise ripple frequency positioning without altering duty cycle control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±2% over full line, load, and temperature (–40°C to 125°C junction) |
| Input Voltage Range | 8 V to 40 V - supports wide industrial and battery-derived supplies without pre-regulation |
| Max Output Current | 3 A continuous - enables single-chip conversion for mid-power systems (e.g., 12 V/36 W loads) |
| Switch RDS(ON) | 0.15 Ω typical - reduces conduction loss and thermal rise at full load |
| Oscillator Frequency | 260 kHz fixed internal - sets baseline ripple frequency and enables use of standard off-the-shelf inductors |
| SYNC Input Range | 280–400 kHz - allows EMI-sensitive designs to shift switching spectrum away from critical bands |
| Standby Quiescent Current | 50 µA max - ensures ultra-low power-off drain in battery-backed or always-on systems |
| Thermal Shutdown | Integrated - protects against sustained overload or poor heatsinking in enclosed environments |
Pinout & Package
LM2670SD-12/NOPB is packaged in a 7-pin TO-263 (KTW) surface-mount thermally enhanced package with exposed thermal pad. Dimensions are 10.1 mm × 15.24 mm. The package requires soldering the thermal pad to a PCB copper pour for optimal thermal performance (RθJA = 35°C/W with 0.4896 in² copper).
| 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 low-inductance, high-current trace |
| 2 (VIN) | Input supply | Main power input (8–40 V); requires local 10–100 µF ceramic + bulk capacitor; shortest possible path to GND |
| 3 (CBOOST) | Bootstrap capacitor | Connects to SW via 100 nF ceramic capacitor - enables full gate drive for low RDS(ON) operation |
| 4 (GND) | Power ground | Primary return for VIN, SW, FB, and ON/OFF; must tie to thermal pad and system ground plane |
| 5 (SYNC) | Sync clock input | Accepts external 280–400 kHz TTL/CMOS clock; overrides internal oscillator - used for EMI filtering consistency |
| 6 (FB) | Feedback sense | Internally connected to 12 V divider - shorted directly to VOUT for fixed-output operation; no external resistors needed |
| 7 (ON/OFF) | Enable control | Active-high logic input; ≥1.4 V enables regulation, ≤0.8 V disables with 50 µA standby draw; internal 20 µA pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12 V output | Eliminates external feedback resistor network - improves accuracy, reduces BOM count, and avoids resistor drift errors |
| External sync capability | Enables deterministic ripple frequency placement - critical for meeting CISPR-22 conducted EMI limits in comms equipment |
| 150 mΩ DMOS switch | Reduces I²R losses at 3 A load - delivers 94% efficiency at 24 VIN/12 VOUT, lowering thermal design burden |
| –40°C to 125°C operation | Validated across full automotive and industrial temperature range - suitable for under-hood or factory-floor deployments |
| WEBENCH® integration | Supports instant schematic generation, component selection, and efficiency simulation - cuts design time from days to hours |
| Thermal shutdown + current limit | Provides autonomous fault protection without external circuitry - prevents damage during short-circuit or overheating events |
Applications
| Industrial Power Supply | Communications Equipment |
|---|---|
Use Scenario: Converting 24 V rail to stable 12 V for PLC I/O modules and sensor interfaces in harsh factory environments. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 12 V power with thermal robustness and wide-input tolerance. Use Value: Delivers 3 A at 94% efficiency with integrated current limiting and thermal shutdown - reducing need for external protection components. | Use Scenario: Generating clean 12 V bias for RF front-end amplifiers and transceivers where spectral purity and EMI compliance are mandatory. IC Role / Device Role / Timing Role: Synchronized buck converter whose switching frequency is locked to system clock to avoid heterodyne interference. Use Value: External SYNC pin enables precise 300 kHz ripple placement - simplifying EMI filter design and passing EN 301 489-1 radiated emissions tests. |
| Battery Charger Pre-regulator | Test & Measurement Instrumentation |
Use Scenario: Stepping down variable 12–36 V battery pack voltage to fixed 12 V before linear post-regulation in multi-chemistry chargers. IC Role / Device Role / Timing Role: High-efficiency preregulator minimizing heat dissipation in compact, fanless enclosures. Use Value: 8–40 V input range accommodates lead-acid, LiFePO₄, and NiMH battery states-of-charge without input stage redesign. | Use Scenario: Providing low-noise, tightly regulated 12 V for analog signal chains and ADC reference circuits in portable benchtop analyzers. IC Role / Device Role / Timing Role: Main DC-DC stage with ON/OFF control enabling deep-sleep mode between measurements. Use Value: 50 µA standby current extends battery life in handheld instruments - while ±2% output tolerance ensures measurement repeatability. |
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/NOPB | Same pinout, 3 A rating, but 100 kHz fixed frequency and lower efficiency (88% typ. at 24 VIN) | Lower switching frequency increases inductor size and reduces EMI filtering complexity - suited for cost-sensitive, non-EMI-critical designs | Select when board space permits larger magnetics and EMI requirements are relaxed |
| TPS5430DDAR | 3 A, 5.5–36 V input, adjustable output, 500 kHz switching, no SYNC pin, smaller 8-pin SO PowerPAD package | Lacks external sync and fixed 12 V option - requires feedback resistors and adds design validation effort | Choose when higher frequency (smaller L/C), adjustable output, or tighter footprint are priorities over sync control and simplicity |
Compared with LM2671SD-12/NOPB, LM2670SD-12/NOPB offers higher efficiency and EMI-controllable sync; versus TPS5430DDAR, it trades adjustability and package size for fixed-output simplicity and deterministic ripple management - making it optimal for 12 V–specific, EMI-constrained industrial and comms power rails.
Availability
LM2670SD-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, communications equipment, battery charger pre-regulators, and test instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2670SD-12/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2670 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in non-isolated DC-DC buck applications where fast time-to-market, minimal external components, and predictable thermal behavior are critical.
FAQ
What is the recommended input capacitor for LM2670SD-12/NOPB?
A minimum 10 µF X7R ceramic capacitor placed within 5 mm of the VIN and GND pins is required for high-frequency decoupling. For transient suppression, add a 47–100 µF aluminum or tantalum bulk capacitor in parallel. Layout must minimize loop area between VIN, GND, and CIN to prevent ringing and ensure stability - this is explicitly validated in the LM2670SD-12/NOPB datasheet Figure 7-1 layout example.
Does LM2670SD-12/NOPB require external feedback resistors?
No. LM2670SD-12/NOPB is the fixed 12 V output variant - its internal feedback divider is factory-trimmed and connected internally. Pin 6 (FB) must be shorted directly to the output capacitor's positive terminal. Adding external resistors will disrupt regulation and is not supported per the LM2670SD-12/NOPB datasheet Section 6.3.6.
Can LM2670SD-12/NOPB operate with an input voltage below 8 V?
No. The absolute minimum recommended input voltage is 8 V per Section 5.3 of the LM2670SD-12/NOPB datasheet. Operation below 8 V risks failure to start, unstable regulation, or dropout - especially under load. The device lacks undervoltage lockout (UVLO) hysteresis below this threshold, so reliable operation is not guaranteed.
How does the SYNC pin affect current limiting on LM2670SD-12/NOPB?
When the SYNC pin is actively driven with an external clock, the LM2670SD-12/NOPB disables current limit frequency foldback (Section 6.3.5). This means short-circuit protection remains active, but the foldback mechanism that reduces switching frequency under overload is suspended - potentially increasing power dissipation during sustained faults. Designers must verify thermal margin under worst-case short conditions when using SYNC.
What thermal pad connection is required for LM2670SD-12/NOPB in the KTW package?
The exposed thermal pad on the LM2670SD-12/NOPB KTW package must be soldered to a dedicated PCB copper pour tied to GND. TI specifies a minimum of 0.4896 in² (3.16 cm²) of 1 oz copper with ≥12 thermal vias to inner ground planes to achieve RθJA = 35°C/W (Section 5.4). Omitting this compromises thermal performance and may trigger premature thermal shutdown at >2 A loads.
LM2670SD-12/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:
- 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/NOPB FAQ
1.How can I place an order for LM2670SD-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670SD-12/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 LM2670SD-12/NOPB reliable?
The price and inventory of LM2670SD-12/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670SD-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670SD-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670SD-12/NOPB?
LM2670SD-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670SD-12/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 LM2670SD-12/NOPB?
For technical support, including LM2670SD-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670SD-12/NOPB requirements.
6.How does Aetrix verify that LM2670SD-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670SD-12/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 LM2670SD-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670SD-12/NOPB?
All LM2670SD-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670SD-12/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 LM2670SD-12/NOPB part is unused and in its original packaging.
Return procedure for LM2670SD-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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