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Texas Instruments LM2677T-5.0
- Part No.:
- LM2677T-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2677T-5.0.pdf
- Description:
- IC REG BUCK 5V 5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,835
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Product details
Overview
LM2677T-5.0 from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator IC with fixed 5.0 V output, 5 A load capability, 8–40 V input range, 260 kHz internal oscillator, and integrated 100 mΩ DMOS power switch. It delivers up to 92% efficiency in optimized designs and supports external clock synchronization for ripple frequency control - used in high-efficiency pre-regulators for telecom power systems.
For engineers reviewing the LM2677T-5.0 datasheet, LM2677T-5.0 pinout, LM2677T-5.0 application, or LM2677T-5.0 equivalent, key selection criteria include its ±2% output tolerance over full line/load/temperature, 50 μA standby current, thermal shutdown protection, and compatibility with standard off-the-shelf inductors and low-ESR output capacitors.
Technical Context
The LM2677T-5.0 implements a voltage-mode PWM controller with internal 260 kHz fixed-frequency oscillator or external sync input (280–400 kHz), driving an integrated 100 mΩ DMOS switch. Its feedback loop uses a two-stage high-gain amplifier referenced to an internal 1.21 V bandgap, enabling precise 5.0 V regulation without external resistors.
It features cycle-by-cycle current limiting (6.1–8.3 A typical limit), thermal shutdown, and ON/OFF control with 0.8–2.0 V threshold. The BOOST capacitor (0.01 µF) enables gate overdrive for low RDS(on) operation, while SYNC functionality disables current-limit foldback when active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over −40°C to +125°C, 100 mA–5 A load, 8–40 V input - ensures stable rail for downstream logic or analog circuitry without trimming. |
| Maximum Output Current | 5 A continuous - supports high-power subsystems like FPGA core supplies or motor driver bias rails. |
| Input Voltage Range | 8 V to 40 V - compatible with 12 V/24 V industrial buses and automotive battery-supplied systems after transient suppression. |
| Switching Frequency | 260 kHz internal oscillator (±15%) or 280–400 kHz external sync - enables predictable EMI filtering and consistent ripple spectrum placement. |
| Efficiency | Up to 84% at 12 VIN/5 VOUT/5 A - reduces thermal load vs. linear regulators and minimizes heatsink requirements. |
| Quiescent Current | 4.2–6 mA operating; 50 μA in ON/OFF shutdown - preserves battery life in always-on monitoring circuits. |
| Thermal Protection | Integrated thermal shutdown with automatic recovery - prevents permanent damage during sustained overload or poor PCB cooling. |
Pinout & Package
LM2677T-5.0 is packaged in TO-220 (NDZ0007B), with exposed tab thermally connected to Pin 9 (GND) and electrically isolated. The package supports vertical mounting with ½-inch leads soldered to ≥4 in² copper area for θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 2) | Power Input | Accepts 8–40 V unregulated DC; requires local 0.1–0.47 µF ceramic + bulk capacitor to suppress high di/dt transients. |
| VSW (Pin 1) | Switch Node | Drains internal DMOS switch; connects to inductor and catch diode anode - high dv/dt node requiring tight layout and ground plane. |
| CBOOST (Pin 3) | Bootstrap Supply | 0.01 µF/50 V ceramic capacitor between Pin 3 and Pin 1 - lifts gate drive above VIN to fully enhance internal MOSFET. |
| GND (Pin 4, 9) | Power & Signal Ground | Common return for input/output paths, feedback, and ON/OFF; Pin 9 tab must be soldered to large copper pour for thermal conduction. |
| SYNC (Pin 5) | External Clock Input | TTL/CMOS-compatible sync signal (280–400 kHz); AC-coupled via 100 pF + 1 kΩ to GND - overrides internal oscillator for EMI control. |
| FB (Pin 6) | Feedback Input | Direct connection to 5 V output (no divider); internal 1.21 V reference sets regulation point - sensitive to noise and layout parasitics. |
| ON/OFF (Pin 7) | Enable Control | Active-high logic input; <0.8 V disables regulator (50 μA IQ); internal 20 μA pull-up allows open-circuit default ON operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100 mΩ DMOS Power Switch | Eliminates external high-side FET and gate driver, reducing BOM count and layout complexity for 5 A buck converters. |
| ±2% Output Voltage Tolerance | Guaranteed across full temperature, line, and load range - avoids post-production calibration in precision 5 V supply applications. |
| External Sync Capability (280–400 kHz) | Enables deterministic ripple frequency alignment across multiple converters - critical for noise-sensitive RF and communications subsystems. |
| 50 μA Standby Quiescent Current | Supports low-power wake-on-event architectures where main regulator remains off until system initialization or sensor trigger. |
| Thermal Shutdown + Current Limit | Self-protecting operation under overload, short-circuit, or inadequate heatsinking - maintains reliability without external fault management circuitry. |
Applications
| Industrial Motor Drive Pre-regulator | Telecom Line Card Power |
|---|---|
Use Scenario: Supplies 5 V bias to gate drivers, op-amps, and microcontrollers within 24 V-powered servo drives. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V bus to clean, regulated 5 V with minimal thermal rise. Use Value: Delivers 5 A continuously with 84% efficiency at 24 VIN, reducing heat sink size by >40% versus linear alternatives. |
Use Scenario: Generates 5 V for DSPs, PHYs, and memory on carrier-grade line cards powered from −48 V DC plant. IC Role / Device Role / Timing Role: High-reliability pre-regulator upstream of LDOs, handling wide input transients and EMI constraints. Use Value: Synchronized switching (via external 350 kHz clock) places ripple energy outside critical 30–100 MHz RF bands. |
| Battery-Powered Test Equipment | Automotive Infotainment Core Supply |
Use Scenario: Powers FPGA and ADC subsystems in portable oscilloscopes using 12 V Li-ion battery pack. IC Role / Device Role / Timing Role: Main DC/DC converter with ON/OFF control tied to system sleep mode. Use Value: 50 μA shutdown current extends battery runtime during idle periods without compromising startup speed. |
Use Scenario: Provides 5 V core rail for infotainment head units operating from 9–16 V vehicle battery with cold-crank support. IC Role / Device Role / Timing Role: Robust buck regulator surviving 45 V load-dump transients and −40°C cold starts. Use Value: 8–40 V input range and −40°C to +125°C junction rating meet AEC-Q100 stress requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-5.0 | 3 A max output, 150 kHz fixed frequency, no SYNC input, higher RDS(on) (160 mΩ). | Limited to ≤3 A loads; unsuitable for synchronized multi-rail systems or high-current FPGA supplies. | Select when cost sensitivity outweighs current capability and EMI control needs. |
| TPS54560B | 5.5 A max, 100 kHz–2.5 MHz adjustable frequency, integrated soft-start, higher quiescent current (145 μA). | Requires external compensation; better for ultra-low-noise or wide-frequency-tuning designs but adds design overhead. | Select when programmable frequency, soft-start, or enhanced light-load efficiency are required. |
Compared with LM2677T-5.0, LM2596T-5.0 trades current capacity and sync capability for lower cost, while TPS54560B offers greater flexibility and integration at the expense of added design complexity and higher standby current.
Availability
LM2677T-5.0 is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2677T-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2677 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for rapid, robust buck regulator implementation using minimal external components and industry-standard magnetics.
FAQ
What is the maximum input voltage rating for the LM2677T-5.0?
The absolute maximum input voltage for the LM2677T-5.0 is 45 V, but the recommended operating range is 8 V to 40 V. Exceeding 40 V risks violating the device's safe operating area, especially under thermal stress or high load conditions. The 45 V rating is a destructive limit - not a functional one - and sustained operation above 40 V voids performance guarantees per the datasheet.
Does the LM2677T-5.0 require external feedback resistors to set its output voltage?
No, the LM2677T-5.0 does not require external feedback resistors. It is a fixed-output variant with internal resistor divider network referenced to a 1.21 V bandgap, delivering precisely 5.0 V ±2%. The FB pin (Pin 6) connects directly to the output node - no external components are needed for regulation, simplifying layout and improving stability.
Can the LM2677T-5.0 synchronize to an external clock, and what are the valid frequency limits?
Yes, the LM2677T-5.0 supports external synchronization via Pin 5 (SYNC). Valid input frequencies range from 280 kHz to 400 kHz. Frequencies below 280 kHz may cause erratic operation due to interference with the internal ramp oscillator; frequencies above 400 kHz exceed specification and risk timing violation. A 100 pF capacitor and 1 kΩ pull-down resistor are required for proper AC coupling.
What thermal performance can be expected from the LM2677T-5.0 in a TO-220 package?
In the TO-220 (NDZ0007B) package, the LM2677T-5.0 achieves θJA = 45°C/W when mounted vertically with ½-inch leads soldered to ≥4 in² of 1 oz. copper. Junction-to-case (θJC) is 2°C/W. At 5 A output and 12 V input, typical power dissipation is ~1.2 W - resulting in ~54°C junction rise above ambient, well within the −40°C to +125°C operating range if PCB copper area is properly implemented.
How does the ON/OFF pin function, and what is its threshold voltage?
Pin 7 (ON/OFF) is an active-high enable input with a threshold of 0.8 V (min) to 2.0 V (max). Driving it below 0.8 V disables the regulator, reducing quiescent current to 50 μA. The pin has an internal 20 μA pull-up, so leaving it open defaults to ON. Exceeding 6 V violates the absolute maximum rating and may damage the input protection clamp.
LM2677T-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2677T-5.0 FAQ
1.How can I place an order for LM2677T-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677T-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 LM2677T-5.0 reliable?
The price and inventory of LM2677T-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 LM2677T-5.0 is usually 5 days.
3.What payment methods are accepted for LM2677T-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677T-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677T-5.0?
LM2677T-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677T-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 LM2677T-5.0?
For technical support, including LM2677T-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677T-5.0 requirements.
6.How does Aetrix verify that LM2677T-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2677T-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 LM2677T-5.0 meets industry standards.
7.What is the process for return or replacement of LM2677T-5.0?
All LM2677T-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2677T-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 LM2677T-5.0 part is unused and in its original packaging.
Return procedure for LM2677T-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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