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Texas Instruments LM2677SDX-12/NOPB
- Part No.:
- LM2677SDX-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2677SDX-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,579
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Product details
Overview
LM2677SDX-12/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC voltage regulator with fixed 12 V output, 5 A load capability, 8–40 V input range, 92% peak efficiency at 24 VIN/5 A, and integrated 100 mΩ DMOS power switch. It serves as a high-current pre-regulator in industrial power supplies and communications equipment.
For engineers reviewing the LM2677SDX-12/NOPB datasheet, LM2677SDX-12/NOPB pinout, LM2677SDX-12/NOPB application, or LM2677SDX-12/NOPB equivalent, key selection criteria include its fixed 12 V output tolerance (±2%), −40°C to +125°C junction temperature rating, external sync capability (280–400 kHz), 260 kHz internal oscillator, and thermal shutdown/current limit protection.
Technical Context
The LM2677SDX-12/NOPB implements a current-mode PWM buck controller with an integrated 100 mΩ DMOS switch, enabling continuous conduction mode operation up to 5 A. Its feedback loop uses a precision 1.21 V reference and internal resistive divider for fixed 12 V output regulation.
It supports both internal 260 kHz fixed-frequency operation and external synchronization (280–400 kHz) via the SYNC pin, allowing ripple frequency control for EMI-sensitive applications. Thermal shutdown, cycle-by-cycle current limiting, and ON/OFF control with 50 μA standby current are built-in.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±2% over full line/load/temperature range - ensures stable rail for downstream logic or analog circuitry without external resistor network. |
| Max Output Current | 5 A continuous - supports high-power loads such as FPGAs, RF power stages, or motor drivers without external current boosting. |
| Input Voltage Range | 8 V to 40 V - compatible with 12 V/24 V/36 V industrial bus systems and battery-backed supplies. |
| Peak Efficiency | 92% at VIN = 24 V, IOUT = 5 A - minimizes thermal stress and enables compact heatsink-free designs in enclosed enclosures. |
| Switch RDS(on) | 0.12 Ω typical - reduces conduction loss and improves light-load efficiency versus discrete MOSFET solutions. |
| Oscillator Frequency | 260 kHz internal or 280–400 kHz externally synchronized - enables predictable EMI filtering and consistent ripple spectrum positioning. |
| Operating Junction Temp | −40°C to +125°C - qualified for under-hood automotive auxiliary rails and industrial control cabinets. |
| Standby Current | 50 μA when ON/OFF = 0 V - supports low-power sleep modes in battery-powered gateways or remote sensors. |
Pinout & Package
LM2677SDX-12/NOPB is packaged in a 7-pin DDPAK/TO-263 (KTW) thermally enhanced surface-mount package with exposed die attach pad (DAP) for PCB ground connection. Thermal resistance θJA ranges from 26°C/W (with 7.4× DAP copper area) to 56°C/W (minimal copper), enabling scalable thermal design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW | Switch Node | Drives external catch diode and inductor; swings from VIN to ~−0.5 V during OFF-time - requires low-inductance layout and Schottky diode with <1.3×VIN reverse rating. |
| VIN | Main Input Supply | Accepts 8–40 V unregulated input; must be bypassed with ≥100 μF low-ESR capacitor placed adjacent to pin - critical for stability and EMI suppression. |
| CBOOST | Bootstrap Capacitor Terminal | Connects 0.01 μF/50 V ceramic capacitor to VSW - provides gate overdrive for internal DMOS switch to maintain low RDS(on). |
| GND | Power Ground Reference | Common return for internal circuitry, switch, and feedback amplifier - requires low-impedance ground plane to minimize noise coupling into FB pin. |
| SYNC | External Clock Input | Accepts TTL/CMOS clock (280–400 kHz); AC-coupled via 100 pF + 1 kΩ to GND - disables current-limit foldback when active. |
| FB | Feedback Input | Internally connected to 12 V divider - no external resistors needed; sensitive to noise - must be routed away from VSW and inductor. |
| ON/OFF | Enable Control | Logic-low (<0.8 V) disables regulator; pulls 20 μA internal current source - allows system-level power sequencing and fault shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ DMOS Switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity while maintaining 5 A capability. |
| ±2% Output Tolerance | Guaranteed across −40°C to +125°C, 8–40 VIN, and 100 mA–5 A load - avoids post-regulation trimming in mission-critical 12 V rails. |
| External Sync Capability | Enables precise ripple frequency alignment across multiple converters in dense PCB layouts - essential for EMI compliance in telecom base stations. |
| Thermal Shutdown + Current Limit | Protects against sustained overload or ambient overheating without external sensing components - ensures robustness in unattended industrial deployments. |
| Simple External Component Count | Requires only one inductor, one catch diode, two capacitors (input/output), and one boost capacitor - accelerates design cycle vs. controller+MOSFET alternatives. |
| −40°C to +125°C Operating Range | Validated for extended temperature operation without derating - suitable for outdoor power amplifiers and railway signaling electronics. |
Applications
| Industrial Power Pre-regulator | Communications Equipment Supply |
|---|---|
Use Scenario: Provides stable 12 V intermediate rail from 24 V or 36 V industrial bus to feed isolated DC-DC modules and analog front-ends. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 12 V at up to 5 A with tight line/load regulation and thermal fault protection. Use Value: Replaces linear regulators or multi-stage switching solutions, cutting board space by >40% and improving system efficiency from ~65% to >90%. | Use Scenario: Powers RF transceiver modules and baseband processors in cellular infrastructure equipment where EMI must be tightly controlled. IC Role / Device Role / Timing Role: Synchronized buck converter operating at fixed 350 kHz to align ripple spectra across multiple power domains. Use Value: Enables deterministic EMI filter design and eliminates beat frequencies between power rails - critical for meeting EN 55022 Class B limits. |
| Battery Charger Auxiliary Rail | Automotive Infotainment Pre-regulator |
Use Scenario: Generates clean 12 V supply for charging ICs and USB-PD controllers in portable Li-ion battery packs with wide-input 9–32 V sources. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with ON/OFF control for dynamic power management during charge termination. Use Value: Extends usable battery capacity by minimizing quiescent loss (50 μA standby) and maintaining >85% efficiency down to 1 A load. | Use Scenario: Supplies 12 V to audio DSPs and display controllers in vehicle head units powered from 12 V battery with cold-crank dips to 6 V. IC Role / Device Role / Timing Role: Input-robust buck regulator supporting 8–40 V operation and thermal shutdown during prolonged high-ambient conditions. Use Value: Ensures uninterrupted operation during engine start (≥8 V minimum) and prevents thermal runaway in sealed dash enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SDX-12/NOPB | Higher 8 A output current rating; identical 12 V fixed output, package, and pinout - shares same thermal design but requires larger inductor/diode. | Targeted at higher-power systems (e.g., servo drives) where 5 A margin is insufficient; not drop-in due to increased current handling requirements. | Select when load exceeds 5 A or future-proofing for higher-current revisions is required; verify inductor saturation current and diode RMS rating. |
| TPS54560QDGQRQ1 | Automotive-grade (AEC-Q100) 60 V input, adjustable output, 5 A synchronous buck - replaces external diode with integrated high-side/low-side MOSFETs. | Designed for automotive infotainment with wider VIN (4.5–60 V), lower quiescent current (14 μA), and mandatory automotive qualification. | Choose for new automotive designs requiring AEC-Q100 compliance and cold-crank support below 6 V; requires redesign of feedback network and layout. |
Compared with LM2678SDX-12/NOPB, the LM2677SDX-12/NOPB offers sufficient 5 A capability with smaller magnetics and lower cost, while TPS54560QDGQRQ1 adds automotive qualification and synchronous rectification at the expense of fixed-output simplicity and higher BOM complexity.
Availability
LM2677SDX-12/NOPB is available at Aetrix Electronics and suitable for industrial power pre-regulators, communications equipment supplies, battery charger auxiliary rails, and automotive infotainment pre-regulators requiring stable component supply and long-term production continuity.
Supply support for LM2677SDX-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 LM2677 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for fast, low-risk implementation of efficient, high-current DC-DC buck regulators using minimal external components.
FAQ
What is the maximum input voltage rating for LM2677SDX-12/NOPB?
The absolute maximum input voltage for LM2677SDX-12/NOPB is 45 V, but the recommended operating range is 8 V to 40 V per the datasheet. Exceeding 40 V risks violating the specified operating conditions and may trigger overvoltage protection or reduce reliability. The device is commonly used with 24 V or 36 V industrial supplies within this safe window.
Does LM2677SDX-12/NOPB require external feedback resistors?
No, LM2677SDX-12/NOPB does not require external feedback resistors. It is a fixed-output variant with internal resistor divider set for 12 V, so the FB pin connects directly to the output. This simplifies layout and eliminates resistor tolerance errors - a key advantage over adjustable versions like LM2677-ADJ.
Can LM2677SDX-12/NOPB synchronize to an external clock?
Yes, LM2677SDX-12/NOPB supports external synchronization via the SYNC pin (Pin 5), accepting TTL/CMOS clocks from 280 kHz to 400 kHz. An AC-coupled interface (100 pF capacitor + 1 kΩ pull-down to GND) is required. Note that current-limit foldback is disabled during sync operation, so short-circuit protection behavior differs from free-running mode.
What thermal performance can be expected from LM2677SDX-12/NOPB in a standard PCB layout?
In a standard 4-layer PCB with 0.4896 in² (3.6× package area) of 1 oz. copper connected to the DAP, LM2677SDX-12/NOPB achieves θJA = 35°C/W. At 5 A and 92% efficiency, power dissipation is ~5.3 W, resulting in ~185°C rise above ambient - confirming the need for adequate copper area or heatsinking to stay within the +125°C max junction limit.
Is LM2677SDX-12/NOPB RoHS-compliant and lead-free?
Yes, LM2677SDX-12/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (Texas Instruments' designation for lead-free, RoHS-compliant packaging). It meets JEDEC J-STD-020 moisture sensitivity level 3 and is compatible with standard Pb-free reflow profiles.
LM2677SDX-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:
- 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:
- 5A
- 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)
LM2677SDX-12/NOPB FAQ
1.How can I place an order for LM2677SDX-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677SDX-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 LM2677SDX-12/NOPB reliable?
The price and inventory of LM2677SDX-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 LM2677SDX-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2677SDX-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677SDX-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677SDX-12/NOPB?
LM2677SDX-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677SDX-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 LM2677SDX-12/NOPB?
For technical support, including LM2677SDX-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677SDX-12/NOPB requirements.
6.How does Aetrix verify that LM2677SDX-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2677SDX-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 LM2677SDX-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2677SDX-12/NOPB?
All LM2677SDX-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2677SDX-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 LM2677SDX-12/NOPB part is unused and in its original packaging.
Return procedure for LM2677SDX-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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