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Texas Instruments LM2677SD-12/NOPB
- Part No.:
- LM2677SD-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2677SD-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,340
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Product details
Overview
LM2677SD-12/NOPB from Texas Instruments is a monolithic 5A step-down (buck) DC/DC voltage regulator with fixed 12V output, 8V–40V input range, 260 kHz internal oscillator, 92% peak efficiency at 24VIN/5A, and integrated 100 mΩ DMOS power switch - used in high-efficiency pre-regulators for telecom power systems.
For engineers reviewing the LM2677SD-12/NOPB datasheet, LM2677SD-12/NOPB pinout, LM2677SD-12/NOPB application, or LM2677SD-12/NOPB equivalent, key selection criteria include ±2% output tolerance over line/load, ON/OFF control with 50 μA standby current, external sync capability (280–400 kHz), thermal shutdown, and current limiting - all critical for industrial and communications power designs.
Technical Context
The LM2677SD-12/NOPB implements a current-mode PWM buck controller with internal 260 kHz oscillator and adjustable external sync input (Pin 5). Its DMOS power switch delivers up to 5A continuous output with RDS(ON) = 0.12–0.225 Ω, enabling high-efficiency operation across 8V–40V input.
It features built-in thermal shutdown, cycle-by-cycle current limiting (6.1–8.75 A), ±2% output voltage tolerance (11.76–12.36 V), and ON/OFF control with 0.8–2.0 V threshold. The feedback pin (Pin 6) connects directly to output for fixed-voltage regulation - no external resistors required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±2% (11.76–12.36 V) - ensures stable rail for downstream logic or analog circuitry without feedback divider. |
| Input Voltage Range | 8 V to 40 V - supports wide-range industrial and automotive battery-fed inputs, including 24 V nominal systems. |
| Max Output Current | 5 A continuous - sufficient for powering FPGAs, DSPs, or multi-rail subsystems with single-stage conversion. |
| Peak Efficiency | 92% at VIN = 24 V, IOUT = 5 A - minimizes thermal load and enables compact heatsink-free designs in ambient ≤85°C. |
| Switch RDS(ON) | 0.12–0.225 Ω - reduces conduction loss and improves light-load efficiency vs. discrete MOSFET solutions. |
| Standby Current | 50 μA when ON/OFF pin < 0.8 V - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Oscillator Frequency | 260 kHz (internal) or 280–400 kHz (external sync) - allows EMI-controlled layout and consistent ripple filtering in noise-sensitive RF applications. |
Pinout & Package
LM2677SD-12/NOPB uses the 7-lead DDPAK/TO-263 (KTW) package with exposed thermal pad (DAP), optimized for high-current thermal dissipation on PCB copper areas ≥0.136 in².
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 2) | Input supply connection | Accepts 8–40 V unregulated input; requires local 0.1–0.47 μF ceramic + bulk capacitor for transient suppression. |
| VSW (Pin 1) | Switch node | Drives external catch diode and inductor; swings from VIN to ~−0.5 V during off-time - must be routed with minimal loop area. |
| CBOOST (Pin 3) | Bootstrap capacitor terminal | Connects to 0.01 μF/50 V ceramic cap between Pin 3 and Pin 1 - enables full gate drive for low RDS(ON). |
| GND (Pin 4) | Power ground reference | Common return for internal circuitry, switch, and feedback; requires low-impedance plane tied to DAP for thermal and EMI control. |
| SYNC (Pin 5) | External clock input | Accepts TTL/CMOS sync signal (280–400 kHz); AC-coupled via 100 pF + 1 kΩ to GND - enables precise ripple frequency positioning. |
| FB (Pin 6) | Feedback input | Internally biased to 1.21 V; direct connection to 12 V output sets regulation - no external resistors needed for fixed version. |
| ON/OFF (Pin 7) | Enable/disable control | Logic-level input: <0.8 V disables regulator (50 μA IQ); >2.0 V enables - supports system-level power sequencing. |
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 in 5A buck designs. |
| ±2% output tolerance over line/load/temp | Guarantees stable 12 V rail without post-regulation for sensitive analog or digital loads - verified across −40°C to +125°C. |
| External sync capability (280–400 kHz) | Enables deterministic EMI spectrum placement and synchronized ripple across multiple rails in multi-converter systems. |
| Thermal shutdown + current limiting | Protects against sustained overload or short-circuit faults without external sensing components - self-recovering after fault clears. |
| 50 μA standby quiescent current | Supports low-power wake-on-event architectures where main rail remains active only during processing bursts. |
Applications
| Industrial Power Pre-regulator | Telecom Line Card Supply |
|---|---|
|
Use Scenario: Converting 24 V or 48 V intermediate bus to stable 12 V for FPGA I/O banks and auxiliary logic. IC Role / Device Role / Timing Role: Primary step-down regulator providing regulated 12 V at up to 5 A with tight line/load regulation. Use Value: Replaces discrete buck controllers + MOSFETs, reducing component count by ≥4 while maintaining 92% efficiency at full load. |
Use Scenario: Generating 12 V bias for RF front-end amplifiers and baseband processors in 4G/LTE small cells. IC Role / Device Role / Timing Role: Fixed-output buck converter synchronized to system clock to avoid beat frequencies in sensitive receive bands. Use Value: External sync (280–400 kHz) enables predictable ripple harmonics, simplifying EMI filter design and passing CISPR-32 Class B limits. |
| Battery Charger Auxiliary Rail | Test Equipment Main Supply |
|
Use Scenario: Providing isolated 12 V for microcontroller, display, and sensor interface in portable Li-ion battery chargers. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down variable battery voltage (10–40 V) to fixed 12 V output. Use Value: Wide 8–40 V input range accommodates full battery discharge curve without input stage redesign or voltage boost. |
Use Scenario: Delivering clean, stable 12 V to precision DACs, ADC references, and op-amp stages in benchtop test instruments. IC Role / Device Role / Timing Role: Low-noise, thermally robust DC/DC source with ±2% output accuracy and minimal load-transient droop. Use Value: Internal current limiting and thermal shutdown ensure safe operation during probe shorts or calibration faults without board damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-12/NOPB | Higher 8 A output rating, same 12 V fixed output, identical pinout and package - but larger thermal footprint required. | Suitable for future-proofing where load may scale beyond 5 A; requires larger PCB copper area for thermal management. | Select if headroom for 6–8 A peak loads is needed; otherwise LM2677SD-12/NOPB offers optimal size/cost balance at 5 A. |
| TPS54560DGQR | Adjustable output (0.8–60 V), 60 V max input, 5 A, 2.5–4.5 V UVLO - no fixed 12 V variant; requires external feedback resistors. | Used where output flexibility or higher input voltage (e.g., 48 V transients) is required - not drop-in compatible. | Choose only if adjustable output or >40 V input capability is mandatory; adds design complexity vs. LM2677SD-12/NOPB's plug-and-play fixed 12 V. |
Compared with LM2678SD-12/NOPB, the LM2677SD-12/NOPB delivers identical 12 V regulation with lower thermal mass and smaller PCB footprint; versus TPS54560DGQR, it eliminates feedback resistor selection and layout sensitivity while guaranteeing ±2% accuracy without trimming.
Availability
LM2677SD-12/NOPB is available at Aetrix Electronics and suitable for industrial power pre-regulators, telecom line card supplies, and battery charger auxiliary rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2677SD-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 ease-of-use in high-efficiency, medium-power DC/DC buck applications where minimal external components and fast time-to-market are critical.
FAQ
What is the maximum input voltage rating for the LM2677SD-12/NOPB?
The absolute maximum input voltage for the LM2677SD-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 impact reliability or output regulation accuracy. The device is commonly used with 24 V or 36 V industrial inputs, where it maintains 92% efficiency at full 5 A load.
Does the LM2677SD-12/NOPB require external feedback resistors to set its output voltage?
No - the LM2677SD-12/NOPB is a fixed-output variant with internal feedback resistors calibrated for 12 V ±2%. Pin 6 (FB) connects directly to the output node; no external resistors are needed. This simplifies layout, eliminates resistor tolerance errors, and ensures guaranteed accuracy without trimming - a key advantage over adjustable regulators like the LM2677-ADJ.
Can the LM2677SD-12/NOPB be synchronized to an external clock, and what is the supported frequency range?
Yes, the LM2677SD-12/NOPB supports external synchronization via Pin 5 (SYNC) over 280 kHz to 400 kHz. An AC-coupled TTL/CMOS clock (via 100 pF capacitor and 1 kΩ pull-down) resets the internal oscillator on each rising edge. This feature enables precise ripple frequency control - essential for EMI compliance in RF and communications equipment using the LM2677SD-12/NOPB.
What thermal performance can be expected from the LM2677SD-12/NOPB in the DDPAK/TO-263 package?
In the KTW (DDPAK/TO-263) package, the LM2677SD-12/NOPB achieves θJA = 26°C/W with 7.4× package-area copper and θJC = 2°C/W. At 5 A and 92% efficiency, power dissipation is ~4.8 W - resulting in ~125°C junction rise above ambient with 26°C/W cooling. Proper PCB copper area and optional heatsink keep TJ within the −40°C to +125°C operating range.
How does the ON/OFF pin function on the LM2677SD-12/NOPB, and what current does it draw in shutdown?
The ON/OFF pin (Pin 7) enables or disables the LM2677SD-12/NOPB: voltage <0.8 V forces shutdown with only 50 μA quiescent current, while >2.0 V enables normal operation. The pin has an internal 20 μA pull-up and 7 V clamp. This allows direct interfacing with microcontrollers or logic gates for power sequencing - and makes the LM2677SD-12/NOPB ideal for systems requiring low-power standby states.
LM2677SD-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)
LM2677SD-12/NOPB FAQ
1.How can I place an order for LM2677SD-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677SD-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 LM2677SD-12/NOPB reliable?
The price and inventory of LM2677SD-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 LM2677SD-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2677SD-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677SD-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677SD-12/NOPB?
LM2677SD-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677SD-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 LM2677SD-12/NOPB?
For technical support, including LM2677SD-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677SD-12/NOPB requirements.
6.How does Aetrix verify that LM2677SD-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2677SD-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 LM2677SD-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2677SD-12/NOPB?
All LM2677SD-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2677SD-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 LM2677SD-12/NOPB part is unused and in its original packaging.
Return procedure for LM2677SD-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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