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Texas Instruments LM2677SD-5.0
- Part No.:
- LM2677SD-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2677SD-5.0.pdf
- Description:
- IC REG BUCK 5V 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,521
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Product details
Overview
LM2677SD-5.0 from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator with integrated 100 mΩ DMOS power switch, delivering up to 5 A at a fixed 5.0 V output. It operates from 8 V to 40 V input, achieves up to 84% efficiency at 12 VIN/5 A, and features ±2% output voltage tolerance over full line/load/temperature. It is used in high-efficiency pre-regulators for communications equipment and battery-powered industrial systems.
For engineers reviewing the LM2677SD-5.0 datasheet, LM2677SD-5.0 pinout, LM2677SD-5.0 application, or LM2677SD-5.0 equivalent, key selection criteria include its 5 A continuous output capability, 260 kHz fixed-frequency operation (or external sync up to 400 kHz), ON/OFF control with 50 μA standby current, thermal shutdown, and compatibility with standard off-the-shelf inductors and low-ESR output capacitors.
Technical Context
The LM2677SD-5.0 implements a current-mode PWM buck controller with internal 260 kHz oscillator and adjustable external synchronization (280–400 kHz). Its DMOS switch supports continuous 5 A output with RDS(ON) = 0.12 Ω (typ), and the feedback loop uses a precision 1.21 V reference for fixed 5.0 V output regulation.
It integrates thermal shutdown, cycle-by-cycle current limiting (6.1–8.3 A), and an ON/OFF pin with 0.8–2.0 V threshold. The BOOST capacitor (0.01 μF) enables gate overdrive for low conduction loss, while SYNC functionality allows ripple frequency control-critical for EMI-sensitive radio and comms applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line/load/temperature - ensures stable logic supply without external resistor divider. |
| Max Output Current | 5 A continuous - supports high-power FPGA I/O rails or multi-rail system pre-regulation. |
| Input Voltage Range | 8 V to 40 V - compatible with 12 V/24 V industrial buses and automotive battery-supplied systems. |
| Switch RDS(ON) | 0.12 Ω (typ) - minimizes conduction loss and thermal rise at full load. |
| Efficiency | 84% at 12 VIN, 5 A - reduces heat sink requirements and improves system power density. |
| Standby Current | 50 μA when ON/OFF = 0 V - enables low-power sleep modes in portable or remote devices. |
| Oscillator Frequency | 260 kHz (internal) or 280–400 kHz (external sync) - balances inductor size vs. EMI filtering complexity. |
Pinout & Package
LM2677SD-5.0 is packaged in the 7-lead DDPAK/TO-263 (package code KTW), featuring an exposed die attach pad (DAP) for enhanced thermal performance. The DAP must be connected to PCB ground plane per TI AN-1187.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch Node | Drives external inductor; swings from VIN to ~−0.5 V during freewheeling - requires low-inductance layout and Schottky catch diode. |
| VIN (Pin 2) | Main Input Supply | Provides bias and power to internal circuitry and switch; requires local 0.1–0.47 μF ceramic + bulk capacitor. |
| CBOOST (Pin 3) | Bootstrap Capacitor Terminal | Connects to VSW via 0.01 μF/50 V ceramic - enables full gate drive for low RDS(ON). |
| GND (Pin 4) | Power Ground | Reference for all internal circuits and switch return path - must tie to broad ground plane to minimize noise coupling. |
| SYNC (Pin 5) | External Clock Input | Accepts TTL/CMOS clock (280–400 kHz); AC-coupled via 100 pF + 1 kΩ to ground - enables precise ripple spectrum control. |
| FB (Pin 6) | Feedback Input | Internally connected to 5 V divider - direct connection to output suffices; no external resistors required. |
| ON/OFF (Pin 7) | Enable Control | Active-high logic; <0.8 V disables regulator with 50 μA quiescent draw - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ DMOS Switch | Enables 5 A output without external MOSFET, reducing BOM count and layout area. |
| ±2% Output Tolerance | Guarantees compliance with 5 V digital rail specifications across temperature and load without trimming. |
| External Sync Capability (280–400 kHz) | Allows deterministic ripple frequency placement for consistent EMI filter design across multiple boards. |
| Thermal Shutdown & Current Limit | Protects against sustained overload or ambient overheating without external sensing components. |
| Simple External Component Requirements | Works with standard off-the-shelf inductors (e.g., Renco, Pulse, Coilcraft) and low-ESR capacitors - accelerates design cycle. |
Applications
| Industrial Power Pre-regulator | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Converts unregulated 24 V industrial bus to clean 5 V for microcontroller, ADC, and interface ICs in PLC modules. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable 5 V rail with high PSRR and low output ripple under dynamic load steps. Use Value: Eliminates need for discrete MOSFET + controller solution; 84% efficiency reduces thermal load in sealed enclosures. | Use Scenario: Powers portable oscilloscope or multimeter with variable battery input (10–36 V) and strict 5 V ±2% requirement for analog front-end. IC Role / Device Role / Timing Role: Main DC/DC converter enabling wide-input operation while maintaining tight output regulation during battery discharge. Use Value: 50 μA standby current extends battery life in sleep mode; ON/OFF pin supports automatic wake-on-trigger. |
| Communications Baseband Module | RF Transceiver Power Supply |
Use Scenario: Supplies 5 V to baseband processor and memory in LTE small cell unit operating from 12 V PoE-derived input. IC Role / Device Role / Timing Role: High-current pre-regulator feeding LDOs; synchronized switching prevents beat frequencies with RF clocks. Use Value: External SYNC pin allows locking to system master clock, suppressing conducted EMI in sensitive receive bands. | Use Scenario: Generates 5 V for RF power amplifier bias and transceiver ICs in handheld radios with 13.8 V nominal battery input. IC Role / Device Role / Timing Role: Efficient intermediate rail generator; thermal shutdown protects against antenna mismatch-induced PA overcurrent. Use Value: Integrated current limit and thermal protection eliminate need for external fault monitoring circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0 | Same pinout, identical 5 V fixed output, but rated for 3 A only and lacks SYNC capability. | Suitable for lower-current designs where EMI control is not critical and board space permits larger inductor. | Select LM2678-5.0 only if 3 A output suffices and external sync is unnecessary. |
| TPS54560B | Adjustable output (1.22–36 V), 5 A, 100% duty cycle capability, 3.5–60 V input, no integrated BOOT capacitor path. | Supports wider input range and programmable output, but requires external feedback resistors and BOOT capacitor routing. | Choose TPS54560B when input exceeds 40 V or output voltage flexibility is needed beyond 5 V. |
Compared with LM2678-5.0, LM2677SD-5.0 delivers 67% higher current and adds SYNC for EMI control; versus TPS54560B, it offers simpler fixed-output implementation and integrated BOOST path-but lacks input voltage headroom above 40 V.
Availability
LM2677SD-5.0 is available at Aetrix Electronics and suitable for industrial power pre-regulators, battery-powered test equipment, communications baseband modules, and RF transceiver power supplies requiring stable component supply and long-term production continuity.
Supply support for LM2677SD-5.0 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 company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability power conversion solutions.
The LM2677 series belongs to TI's SIMPLE SWITCHER® family of easy-to-design, high-efficiency buck regulators targeting cost-sensitive industrial, communications, and battery-powered applications.
FAQ
What is the maximum input voltage rating for the LM2677SD-5.0?
The absolute maximum input voltage for the LM2677SD-5.0 is 45 V, but the recommended operating range is 8 V to 40 V per the datasheet. Exceeding 40 V may trigger overvoltage stress on internal circuitry and reduce reliability. The LM2677SD-5.0 is designed for robust operation within this window, including transient spikes common in 24 V industrial systems. Always verify input transient suppression in final design.
Does the LM2677SD-5.0 require external feedback resistors to set the 5 V output?
No, the LM2677SD-5.0 does not require external feedback resistors. It is a fixed-output variant with internal resistor divider network calibrated for 5.0 V ±2% output. Pin 6 (FB) connects directly to the output node. This simplifies layout and eliminates resistor tolerance errors - a key advantage of the LM2677SD-5.0 over adjustable regulators like the LM2677-ADJ.
Can the LM2677SD-5.0 synchronize to an external clock, and what is the supported frequency range?
Yes, the LM2677SD-5.0 supports external synchronization via Pin 5 (SYNC). It accepts TTL- or CMOS-compatible clock signals from 280 kHz to 400 kHz. The external clock must exceed the internal oscillator's upper limit (280 kHz) to avoid erratic reset behavior. The LM2677SD-5.0 uses positive-edge triggering with a 100 pF / 1 kΩ RC network for reliable synchronization - essential for EMI-controlled RF designs.
What thermal considerations apply to the LM2677SD-5.0 in TO-263 (DDPAK) package?
The LM2677SD-5.0 in DDPAK (KTW) package has θJA ranging from 26°C/W to 56°C/W depending on PCB copper area. With 7.4× package-area copper and 12 vias, θJA drops to 26°C/W. The exposed DAP must be soldered to a solid ground plane per TI AN-1187. At 5 A and 84% efficiency, power dissipation is ~4.8 W - adequate copper and airflow are mandatory to maintain TJ ≤125°C.
How does the ON/OFF pin function on the LM2677SD-5.0, and what is its threshold voltage?
The ON/OFF pin (Pin 7) enables or disables the LM2677SD-5.0. It has a threshold of 0.8 V to 2.0 V: below 0.8 V disables the regulator, drawing only 50 μA; above 2.0 V enables full operation. An internal 20 μA pull-up and 7 V clamp protect the pin. In active mode, the LM2677SD-5.0 delivers regulated 5 V; in shutdown, output collapses and internal switch turns off - supporting system-level power sequencing and low-power states.
LM2677SD-5.0 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):
- 5V
- 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-5.0 FAQ
1.How can I place an order for LM2677SD-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677SD-5.0 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-5.0 reliable?
The price and inventory of LM2677SD-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2677SD-5.0 is usually 5 days.
3.What payment methods are accepted for LM2677SD-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677SD-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677SD-5.0?
LM2677SD-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677SD-5.0 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-5.0?
For technical support, including LM2677SD-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677SD-5.0 requirements.
6.How does Aetrix verify that LM2677SD-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2677SD-5.0 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-5.0 meets industry standards.
7.What is the process for return or replacement of LM2677SD-5.0?
All LM2677SD-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2677SD-5.0, 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-5.0 part is unused and in its original packaging.
Return procedure for LM2677SD-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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