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Texas Instruments LM2677SDX-5.0
- Part No.:
- LM2677SDX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2677SDX-5.0.pdf
- Description:
- IC REG BUCK 5V 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,436
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Product details
Overview
LM2677SDX-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 output current at a fixed 5.0 V output voltage, operating from 8 V to 40 V input, and achieving up to 84% efficiency at 12 VIN/5 A. It is used in high-efficiency pre-regulators for linear regulators and battery-powered industrial systems.
For engineers reviewing the LM2677SDX-5.0 datasheet, LM2677SDX-5.0 pinout, LM2677SDX-5.0 application, or LM2677SDX-5.0 equivalent, key selection criteria include its 5.0 V ±2% output tolerance over full line/load/temperature, 260 kHz fixed internal oscillator, ON/OFF control with 50 μA standby current, and external sync capability from 280 kHz to 400 kHz.
Technical Context
The LM2677SDX-5.0 implements a current-mode PWM buck regulator architecture with internal ramp compensation and cycle-by-cycle current limiting. Its 100 mΩ DMOS switch enables high efficiency across 8–40 V input range while maintaining tight output regulation under dynamic load steps.
It features a dedicated BOOST pin (Pin 3) requiring a 0.01 μF ceramic capacitor to gate-drive the internal MOSFET above VIN, a SYNC pin (Pin 5) accepting TTL/CMOS clocks for precise ripple frequency control, and an ON/OFF pin (Pin 7) enabling hard shutdown with 50 μA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over −40°C to +125°C junction temperature, 8–40 V input, 100 mA–5 A load. |
| Max Output Current | 5 A continuous; current limit threshold is 6.1 A (typ), 5.75–8.75 A (min/max) across temperature. |
| Input Voltage Range | 8 V to 40 V DC; absolute maximum rating is 45 V. |
| Switching Frequency | 260 kHz fixed internal oscillator (225–280 kHz over temp); externally synchronizable from 280 kHz to 400 kHz. |
| Efficiency | 84% typical at VIN = 12 V, IOUT = 5 A, TA = 25°C. |
| Quiescent Current | 4.2 mA typical operating; 50 μA standby when ON/OFF pin ≤ 0.8 V. |
| RDS(ON) | 0.14 Ω typical at ISW = 5 A; enables low conduction loss and high thermal efficiency. |
Pinout & Package
LM2677SDX-5.0 is packaged in the 7-lead DDPAK/TO-263 (Package Number KTW0007B), featuring an exposed die attach pad (DAP) that must be connected to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch Node | Drives external inductor; swings between VIN (ON) and ~−0.5 V (OFF via Schottky clamp); requires low-inductance layout. |
| VIN (Pin 2) | Power Input | Supplies bias and load energy; must be bypassed with ≥10 μF low-ESR capacitor close to pin. |
| CBOOST (Pin 3) | Bootstrap Capacitor Terminal | Connects to 0.01 μF/50 V ceramic cap tied to VSW; enables full gate drive for low RDS(ON). |
| GND (Pin 4) | Power Ground | Main return path for switch, feedback, and control circuits; requires low-impedance ground plane. |
| SYNC (Pin 5) | External Clock Input | Accepts 280–400 kHz TTL/CMOS clock via 100 pF series cap + 1 kΩ to GND; disables current-limit foldback when active. |
| FB (Pin 6) | Feedback Input | Internally connected to 5 V divider; direct connection to output required for regulation; bias current <85 nA. |
| ON/OFF (Pin 7) | Enable Control | Logic-low ≤0.8 V disables regulator; internal 20 μA pull-up; clamped to 7 V zener; max 6 V absolute rating. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ DMOS Switch | Eliminates external high-side FET and driver, reducing BOM count and layout complexity for 5 A buck designs. |
| ±2% Output Voltage Accuracy | Ensures stable 5.0 V rail for downstream logic, ADC references, and analog circuitry without post-regulation. |
| 260 kHz Fixed-Frequency Operation | Enables predictable EMI profile and consistent filter design using standard off-the-shelf inductors and capacitors. |
| External Sync Capability (280–400 kHz) | Allows system-level clock alignment to avoid beat frequencies and meet spectral mask requirements in comms/radio gear. |
| Thermal Shutdown & Cycle-by-Cycle Current Limit | Provides robust fault protection during overload, short-circuit, or high-temp conditions without external sensing components. |
Applications
| Industrial Power Pre-regulator | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Converts unregulated 24 V industrial bus to stable 5 V for microcontroller, sensor interface, and data acquisition subsystems. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, efficient, and thermally robust 5 V rail with minimal external components. Use Value: Delivers 5 A continuous output with 84% efficiency at 12 VIN, reducing heat sink requirements and enabling compact enclosure designs. | Use Scenario: Powers portable oscilloscopes, multimeters, and signal generators from 12–36 V Li-ion or lead-acid battery packs. IC Role / Device Role / Timing Role: High-current buck converter enabling long runtime and stable 5 V supply despite wide battery voltage swing. Use Value: Maintains ±2% output accuracy across 8–40 V input and −40°C to +125°C, ensuring measurement integrity in field-deployed instruments. |
| Communications Baseband Supply | RF Power Amplifier Bias Rail |
Use Scenario: Supplies clean 5 V to FPGA, DSP, and Ethernet PHY in cellular base stations and small-cell radios. IC Role / Device Role / Timing Role: Synchronized buck regulator locked to system clock to minimize interference with sensitive RF receive paths. Use Value: External SYNC input allows precise ripple frequency positioning outside critical IF bands, easing EMC filtering. | Use Scenario: Generates 5 V bias for GaAs/GaN driver stages and analog front-end ICs in microwave transceivers. IC Role / Device Role / Timing Role: High-current, low-noise DC/DC stage supporting fast transient response for pulsed RF operation. Use Value: 5 A capability and 50 μA standby current enable rapid on/off cycling of PA sections without compromising efficiency or thermal margin. |
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-5.0 | Same pinout and function but rated for 8 A output; higher RDS(ON) (80 mΩ vs 100 mΩ) and lower efficiency at 5 A. | Better suited for future-proofing or higher peak loads; larger thermal footprint required. | Select LM2678SDX-5.0 only if >5 A headroom or higher current limit (9.5 A typ) is needed; otherwise LM2677SDX-5.0 offers optimal size/efficiency trade-off. |
| TPS54560DGQR | 60 V input, 5 A synchronous buck; no integrated BOOT cap requirement; 100 kHz–2.5 MHz adjustable frequency; no SYNC pin. | Supports wider input range and higher switching frequencies; lacks external sync for EMI control. | Choose TPS54560DGQR for 40–60 V inputs or programmable frequency; LM2677SDX-5.0 remains preferred where sync alignment or TI SIMPLE SWITCHER ecosystem compatibility is critical. |
Compared with LM2678SDX-5.0 and TPS54560DGQR, LM2677SDX-5.0 delivers best-in-class thermal performance in DDPAK at 5 A with built-in sync capability for EMI-sensitive applications, while maintaining minimal external component count and proven reliability in industrial deployments.
Availability
LM2677SDX-5.0 is available at Aetrix Electronics and suitable for industrial power pre-regulators, battery-powered test equipment, and communications baseband supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2677SDX-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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and communications reach.
The LM2677 series belongs to TI's SIMPLE SWITCHER® family-designed to simplify high-efficiency DC/DC buck converter implementation using minimal external components while delivering robust performance from 8 V to 40 V input.
FAQ
What is the maximum input voltage rating for LM2677SDX-5.0?
The absolute maximum input voltage for LM2677SDX-5.0 is 45 V DC. The recommended operating range is 8 V to 40 V. Exceeding 45 V risks permanent damage to the internal DMOS switch and control circuitry, as confirmed in the Absolute Maximum Ratings table of the SNVS077I datasheet. For reliable long-term operation, design margins should keep VIN ≤ 40 V under all conditions including transients.
Does LM2677SDX-5.0 require an external bootstrap capacitor?
Yes, LM2677SDX-5.0 requires a 0.01 μF ceramic capacitor (rated ≥50 V) connected between the CBOOST pin (Pin 3) and the VSW pin (Pin 1). This capacitor provides gate-boost voltage to fully enhance the internal DMOS switch, minimizing RDS(ON) and maximizing efficiency. Omitting it causes significant conduction loss and potential thermal failure under 5 A load, per TI Application Hints section.
Can LM2677SDX-5.0 be synchronized to an external clock?
Yes, LM2677SDX-5.0 supports external synchronization via Pin 5 (SYNC) over 280 kHz to 400 kHz. A 100 pF capacitor in series with a 1 kΩ resistor to ground is required for proper edge-triggered reset of the internal oscillator. When enabled, SYNC overrides the 260 kHz internal clock but disables current-limit foldback, so short-circuit protection behavior changes-details are specified in the SNVS077I datasheet Section "SYNC".
What is the output voltage tolerance of LM2677SDX-5.0 over temperature and load?
LM2677SDX-5.0 guarantees ±2% output voltage tolerance over full operating conditions: −40°C to +125°C junction temperature, 8–40 V input, and 100 mA to 5 A load. This is verified by TI's production testing per the LM2677-5.0 Electrical Characteristics table (SNVS077I, page 4), where min/max limits are 4.850 V to 5.150 V at temperature extremes.
Is thermal shutdown included in LM2677SDX-5.0?
Yes, LM2677SDX-5.0 integrates thermal shutdown protection that disables the regulator when junction temperature exceeds approximately 165°C. Recovery occurs automatically once temperature falls below the hysteresis threshold (~150°C). This feature is documented in the "Features" list and "APPLICATION HINTS" section of the SNVS077I datasheet and operates independently of current limit or ON/OFF control.
LM2677SDX-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)
LM2677SDX-5.0 FAQ
1.How can I place an order for LM2677SDX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677SDX-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 LM2677SDX-5.0 reliable?
The price and inventory of LM2677SDX-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 LM2677SDX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2677SDX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677SDX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677SDX-5.0?
LM2677SDX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677SDX-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 LM2677SDX-5.0?
For technical support, including LM2677SDX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677SDX-5.0 requirements.
6.How does Aetrix verify that LM2677SDX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2677SDX-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 LM2677SDX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2677SDX-5.0?
All LM2677SDX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2677SDX-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 LM2677SDX-5.0 part is unused and in its original packaging.
Return procedure for LM2677SDX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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