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Texas Instruments LM2677SD-5.0/NOPB
- Part No.:
- LM2677SD-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2677SD-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:768
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Product details
Overview
LM2677SD-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC voltage regulator with fixed 5-V output, 5-A load capability, 8–40 V input range, and integrated 100-mΩ DMOS power switch-designed for high-efficiency (>92%) power conversion in industrial and communications systems.
For engineers reviewing the LM2677SD-5.0/NOPB datasheet, LM2677SD-5.0/NOPB pinout, LM2677SD-5.0/NOPB application, or LM2677SD-5.0/NOPB equivalent, key selection criteria include its ±2% output tolerance over line/load/temperature, 260-kHz fixed-frequency operation, external sync capability (280–400 kHz), thermal shutdown protection, and ON/OFF control with 50-μA standby current.
Technical Context
The LM2677SD-5.0/NOPB implements a synchronous-buck topology using an internal high-side DMOS FET and external Schottky diode (or optional synchronous rectifier). Its PWM controller features a 260-kHz internal oscillator or externally synchronized operation, enabling precise ripple frequency control for EMI-sensitive applications like radio equipment.
It integrates feedback amplification, current limiting (6.1–8.3 A), thermal shutdown, and a dedicated boot-strap capacitor (CB) pin to drive the high-side gate above VIN-ensuring low RDS(ON) (0.12–0.225 Ω) and high efficiency across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line, load, and temperature (–40°C to 125°C) |
| Max Output Current | 5 A continuous; current limit threshold 6.1–8.3 A depending on temperature |
| Input Voltage Range | 8 V to 40 V DC - supports wide-input industrial and battery-derived supplies |
| Switching Frequency | 260 kHz fixed internal oscillator; externally synchronizable from 280 kHz to 400 kHz |
| Efficiency | Up to 92% (at 12 VIN, 5 A for 12-V version); 84% typical at 12 VIN, 5 A for 5-V version |
| Quiescent Current | 6 mA operating; 50–150 μA standby when ON/OFF pin < 0.8 V |
| RDS(ON) | 0.12 Ω typical at 25°C; increases to 0.225 Ω at –40°C to +125°C - directly impacts conduction loss |
Pinout & Package
LM2677SD-5.0/NOPB is packaged in a 7-pin TO-263 (DDPAK) surface-mount package with exposed thermal pad (DAP) for enhanced heat dissipation. The package measures 10.16 mm × 8.69 mm and requires PCB ground connection to the DAP per AN-1187 guidelines.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VSW | Switch node output | Drives inductor; swings between VIN (ON) and ~–0.5 V (OFF via external diode); critical for layout low-inductance routing |
| VIN | Power input | Connects to input supply and high-frequency bypass capacitor; path to GND must be shortest possible |
| CB | Bootstrap capacitor terminal | Requires 0.01 μF ceramic capacitor to VSW; enables full enhancement of internal high-side MOSFET gate |
| GND | Power ground | Common reference for CIN, COUT, and feedback; must connect to broad ground plane |
| SYNC | External clock input | Accepts TTL/CMOS clock (280–400 kHz); disables current-limit foldback when active |
| FB | Feedback sense | Internally connected to 5-V output divider; shorted directly to output for fixed 5-V operation |
| ON/OFF | Enable control | Logic-high (>1.4 V) enables regulation; logic-low (<0.8 V) disables with 50-μA standby draw |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ DMOS switch | Enables 5-A output without external MOSFET; reduces BOM count and layout complexity |
| ±2% output voltage tolerance | Guaranteed over full input (8–40 V), load (100 mA–5 A), and temperature (–40°C to 125°C) range - eliminates post-regulation trimming |
| External sync capability (280–400 kHz) | Allows precise ripple frequency positioning for EMI filtering and spectrum compliance in comms/radio systems |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating; auto-recovery after fault removal |
| 50-μA standby quiescent current | Supports low-power system sleep modes while maintaining fast wake-up response |
Applications
| Industrial Power Supply | Communications Equipment |
|---|---|
|
Use Scenario: Distributed 24-V rail powering FPGA I/O banks and peripheral logic in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V to stable 5 V at up to 5 A with minimal thermal rise. Use Value: High efficiency (84% @ 12 VIN/5 A) reduces heatsink requirements; ±2% tolerance ensures reliable digital interface operation. |
Use Scenario: Base station RF module requiring clean, synchronized 5-V supply for analog front-end ICs. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to fix ripple frequency and suppress beat interference. Use Value: External SYNC input (280–400 kHz) enables deterministic ripple placement outside sensitive IF bands. |
| Battery-Powered Test Equipment | Automotive Aftermarket Electronics |
|
Use Scenario: Portable oscilloscope with 12-V Li-ion pack powering mixed-signal subsystems including ADC references and microcontroller core. IC Role / Device Role / Timing Role: High-current preregulator stepping down variable battery voltage (10–16 V) to regulated 5 V before LDO post-regulation. Use Value: Wide 8–40 V input range accommodates battery sag and surge; 50-μA standby extends runtime in sleep mode. |
Use Scenario: In-vehicle infotainment head unit powered from 12-V automotive bus with cold-crank (6 V) and load-dump (40 V) transients. IC Role / Device Role / Timing Role: Robust primary DC-DC stage handling 8–40 V input range and built-in thermal/current protection. Use Value: Absolute max input rating of 45 V and –40°C to +125°C operation ensure reliability under harsh vehicle conditions. |
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/NOPB | Same pinout and function but rated for 3-A output; lower current limit (4.5 A) and higher RDS(ON) (0.18 Ω) | Suitable only for ≤3-A loads; less thermal margin in high-ambient environments | Select when 3-A output suffices and cost reduction is prioritized over headroom. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 1-A output, 4.5–65 V input, integrated high/low-side FETs, 1.5-MHz switching | Designed for automotive safety-critical systems; lacks 5-A capability and fixed 5-V option | Choose only for AEC-Q100-compliant designs requiring wider input range and higher frequency - not a drop-in replacement. |
Compared with LM2677SD-5.0/NOPB, LM2678-5.0/NOPB offers identical functionality at reduced current capacity, while LM5164QDDARQ1 provides automotive qualification and higher integration but sacrifices output current and fixed 5-V convenience - making LM2677SD-5.0/NOPB optimal for non-automotive 5-A industrial buck applications.
Availability
LM2677SD-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, communications equipment, battery-powered test instruments, and automotive aftermarket electronics requiring stable component supply and long-term production continuity.
Supply support for LM2677SD-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 headquartered in Dallas, Texas, 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 robust thermal performance are essential.
FAQ
What is the maximum input voltage rating for LM2677SD-5.0/NOPB?
The absolute maximum input voltage for LM2677SD-5.0/NOPB is 45 V, with recommended operating range specified as 8 V to 40 V. Exceeding 45 V risks permanent damage; operation at 40 V is fully characterized for 5-A output with thermal derating per the datasheet's RθJA curves. Always observe transient limits during load dump or hot-swap events.
Does LM2677SD-5.0/NOPB require an external bootstrap capacitor?
Yes, LM2677SD-5.0/NOPB requires a 0.01-μF ceramic capacitor connected between the CB pin and VSW pin to enable proper gate drive of the internal high-side DMOS switch. This bootstrap network ensures the gate voltage exceeds VIN by sufficient margin to maintain low RDS(ON) and high efficiency - omission causes severe dropout or failure to regulate.
Can LM2677SD-5.0/NOPB synchronize to an external clock?
Yes, LM2677SD-5.0/NOPB supports external synchronization via its SYNC pin (Pin 5), accepting TTL/CMOS-compatible clocks from 280 kHz to 400 kHz. When used, the internal 260-kHz oscillator is disabled, and ripple frequency becomes precisely controlled - but current-limit foldback is inactive, requiring careful short-circuit protection design.
What is the output voltage tolerance of LM2677SD-5.0/NOPB over temperature?
LM2677SD-5.0/NOPB guarantees ±2% output voltage tolerance over the full operating junction temperature range of –40°C to +125°C, as well as across line and load variations. This is achieved via precision internal feedback resistors and a 1.21-V reference - no external trimming is needed for 5-V applications.
How does the ON/OFF pin function on LM2677SD-5.0/NOPB?
The ON/OFF pin (Pin 7) enables hardware-level control: pulling it below 0.8 V places LM2677SD-5.0/NOPB into shutdown mode with 50–150 μA standby current; pulling it above 1.4 V activates regulation. An internal 20-μA pull-up allows floating the pin for always-on operation - no external bias required unless active control is needed.
LM2677SD-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-VSON (5x6)
LM2677SD-5.0/NOPB FAQ
1.How can I place an order for LM2677SD-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677SD-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 LM2677SD-5.0/NOPB reliable?
The price and inventory of LM2677SD-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 LM2677SD-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2677SD-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677SD-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677SD-5.0/NOPB?
LM2677SD-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677SD-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 LM2677SD-5.0/NOPB?
For technical support, including LM2677SD-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677SD-5.0/NOPB requirements.
6.How does Aetrix verify that LM2677SD-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2677SD-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 LM2677SD-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2677SD-5.0/NOPB?
All LM2677SD-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2677SD-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 LM2677SD-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2677SD-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2677SD-5.0/NOPB Tags
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