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Texas Instruments LM2677T-5.0/NOPB
- Part No.:
- LM2677T-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2677T-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
LM2677T-5.0/NOPB from Texas Instruments is a monolithic 5-A step-down (buck) DC/DC voltage regulator with fixed 5-V output, 8–40 V input range, integrated 100-mΩ DMOS switch, and 260-kHz internal oscillator. It delivers up to 92% efficiency in high-current industrial power supplies and battery-charged systems.
For engineers reviewing the LM2677T-5.0/NOPB datasheet, LM2677T-5.0/NOPB pinout, LM2677T-5.0/NOPB application, or LM2677T-5.0/NOPB equivalent, key selection considerations include ±2% output tolerance over line/load/temperature, 50-μA standby current in shutdown mode, external sync capability (280–400 kHz), thermal shutdown, and current limiting.
Technical Context
The LM2677T-5.0/NOPB implements a synchronous-buck topology using an internal high-side N-channel DMOS FET controlled by a PWM comparator driven by a 260-kHz ramp oscillator. Feedback is sensed directly at the output for fixed 5-V regulation, eliminating external resistors.
Its ON/OFF pin enables hard shutdown with 50-μA quiescent current, while the SYNC pin accepts external TTL/CMOS clocks (280–400 kHz) to override the internal oscillator-enabling precise ripple frequency control for EMI-sensitive radio and communications equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line (8–40 V), load (100 mA–5 A), and temperature (–40°C to 125°C) - ensures stable rail for microcontrollers and analog circuitry without trimming. |
| Max Output Current | 5 A continuous - supports high-power loads such as FPGA core rails or motor drivers without external current boosting. |
| Input Voltage Range | 8 V to 40 V - compatible with 12-V/24-V industrial buses and wide-range battery inputs (e.g., 3S–10S Li-ion). |
| Switch RDS(ON) | 0.14 Ω typical at 25°C - minimizes conduction loss and enables >92% peak efficiency at 5 A with proper layout and heatsinking. |
| Quiescent Current | 6 mA typical in active mode; 50 μA in shutdown - reduces system-level standby power in always-on applications. |
| Oscillator Frequency | 260 kHz fixed (±15% over temperature); externally synchronizable from 280 kHz to 400 kHz - allows deterministic EMI filtering and multi-regulator phase alignment. |
| Thermal Protection | Integrated thermal shutdown with automatic recovery - prevents latch-up during overload or poor heatsink conditions. |
Pinout & Package
LM2677T-5.0/NOPB is packaged in a 7-pin TO-263 (DDPAK) with exposed thermal pad, measuring 10.16 mm × 8.69 mm. The package provides low thermal resistance (RθJA = 26°C/W with 1.0064 in² copper) and requires soldering the DAP to PCB ground for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW | Switch node | Drain of internal high-side DMOS FET; connects to inductor and external Schottky diode cathode - must be routed with minimal loop area to reduce EMI. |
| VIN | Power input | High-side FET source connection; accepts 8–40 V supply - requires low-ESR input capacitor placed adjacent to VIN and GND pins. |
| CB | Bootstrap capacitor terminal | Connects 0.01 μF ceramic capacitor to VSW to generate gate drive voltage above VIN - critical for full enhancement of internal FET. |
| GND | Power ground | Common return for input/output capacitors, feedback, and thermal pad - must tie to solid ground plane to minimize noise coupling. |
| SYNC | External clock input | Accepts 280–400 kHz TTL/CMOS signal via 100-pF AC-coupling cap and 1-kΩ pull-down - overrides internal oscillator for synchronized switching. |
| FB | Feedback sense | Internally connected to 5-V output divider - shorted directly to output capacitor for fixed 5-V operation; no external resistors required. |
| ON/OFF | Enable control | Logic-level input: ≥1.4 V enables regulation; ≤0.8 V forces shutdown with 50-μA IQ - supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ DMOS switch | Enables single-chip 5-A buck conversion without external MOSFETs - reduces BOM count and layout complexity. |
| ±2% output voltage tolerance | Guaranteed across full operating range - eliminates need for post-production calibration in precision 5-V logic or ADC reference rails. |
| External sync capability (280–400 kHz) | Allows deterministic ripple frequency placement - essential for meeting CISPR-22 conducted EMI limits in communication equipment. |
| 50-μA shutdown current | Supports ultra-low-power sleep modes in portable and battery-backed systems - extends runtime without sacrificing startup speed. |
| Thermal shutdown + current limit | Provides fault protection under overload, short-circuit, or inadequate heatsinking - enables robust operation in unattended industrial environments. |
Applications
| Industrial Power Supply | Battery Charger Controller |
|---|---|
|
Use Scenario: Converts 24-V factory bus to regulated 5-V rail for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 5-A continuous current with tight line/load regulation. Use Value: Eliminates need for external pass transistor or secondary LDO; maintains ±2% output accuracy despite 8–40 V input variation. |
Use Scenario: Provides constant-voltage stage in multi-stage Li-ion charger for electric tools or medical devices. IC Role / Device Role / Timing Role: Pre-regulator supplying clean 5-V input to linear charger ICs or battery management units. Use Value: High efficiency (>92%) minimizes heat generation during high-current charging; SYNC input aligns ripple with communication bursts. |
| Communications Equipment | Test & Measurement Instrumentation |
|
Use Scenario: Powers RF front-end ICs and baseband processors in cellular repeaters and point-to-point radios. IC Role / Device Role / Timing Role: Synchronized buck converter whose 280–400 kHz switching frequency avoids interference with IF bands. Use Value: External SYNC enables precise ripple positioning outside sensitive receive bands - simplifies EMI filter design. |
Use Scenario: Supplies low-noise 5-V rail to high-resolution ADCs, DACs, and precision op-amps in benchtop analyzers. IC Role / Device Role / Timing Role: Main DC/DC converter feeding downstream low-dropout regulators for analog subsystems. Use Value: Fixed 5-V output with ±2% tolerance ensures accurate reference voltage scaling; thermal shutdown prevents drift during extended calibration runs. |
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 and 5-V fixed output, but rated for 3-A max output current and uses external NPN transistor instead of integrated DMOS switch. | Suitable only for lower-current applications (<3 A); requires additional external components and larger board area. | Select LM2678-5.0 only if 3-A output suffices and cost sensitivity outweighs integration benefits. |
| TPS54560B | 60-V input, 5-A adjustable-output buck controller with integrated 110-mΩ FETs, 100-kHz–2.5-MHz sync range, and enhanced light-load efficiency. | Offers wider VIN range and programmable output, but lacks fixed 5-V option and requires external feedback resistors. | Choose TPS54560B when input exceeds 40 V or when dynamic output adjustment is needed; not drop-in for LM2677T-5.0/NOPB. |
Compared with LM2678-5.0, LM2677T-5.0/NOPB delivers higher current (5 A vs. 3 A) and superior integration (integrated DMOS vs. external transistor). Compared with TPS54560B, it offers simpler fixed-output implementation but narrower input range and less flexible frequency tuning.
Availability
LM2677T-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery chargers, communications equipment, and test instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LM2677T-5.0/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 company specializing in analog, embedded processing, and power management technologies, with decades of leadership in high-reliability power conversion ICs.
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 proven thermal robustness are critical.
FAQ
What is the maximum input voltage rating for the LM2677T-5.0/NOPB?
The absolute maximum input voltage for LM2677T-5.0/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding safe junction temperature or violating SOA limits, especially at high load currents. Always observe derating curves in the datasheet for sustained 40-V operation.
Does the LM2677T-5.0/NOPB require external feedback resistors for 5-V output?
No. The LM2677T-5.0/NOPB is a fixed-output variant: its internal feedback divider is factory-trimmed for 5.0 V, so the FB pin is internally connected to the output stage. For this part, connect FB directly to the output capacitor - no external resistors are needed or permitted.
Can the LM2677T-5.0/NOPB be synchronized to an external clock?
Yes. The LM2677T-5.0/NOPB supports external synchronization via its SYNC pin (Pin 5), accepting TTL/CMOS-compatible signals from 280 kHz to 400 kHz. Use a 100-pF capacitor and 1-kΩ resistor to ground for proper AC coupling - this overrides the internal 260-kHz oscillator and locks switching frequency to the external source.
What thermal considerations apply to the LM2677T-5.0/NOPB in TO-263 package?
The LM2677T-5.0/NOPB in TO-263 (KTW) package requires soldering the exposed thermal pad to a minimum 1.0064 in² (7.4× package area) copper pour for RθJA = 26°C/W. Without adequate copper, junction temperature rise can exceed safe limits at 5-A load - verify thermal performance using TI's thermal simulation models or IR camera measurements.
How does the ON/OFF pin function on the LM2677T-5.0/NOPB?
The ON/OFF pin (Pin 7) enables hard shutdown: pulling it below 0.8 V disables the internal switch and reduces quiescent current to 50 μA. At ≥1.4 V, the device starts regulation. The pin has an internal 20-μA pull-up and 7-V Zener clamp - avoid driving above 6 V to prevent damage. Floating the pin enables default operation.
LM2677T-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2677T-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677T-5.0/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 LM2677T-5.0/NOPB reliable?
The price and inventory of LM2677T-5.0/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM2677T-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677T-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677T-5.0/NOPB?
LM2677T-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677T-5.0/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 LM2677T-5.0/NOPB?
For technical support, including LM2677T-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677T-5.0/NOPB requirements.
6.How does Aetrix verify that LM2677T-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2677T-5.0/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 LM2677T-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2677T-5.0/NOPB?
All LM2677T-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2677T-5.0/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 LM2677T-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2677T-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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