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Texas Instruments LM2677SD-ADJ/NOPB
- Part No.:
- LM2677SD-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2677SD-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:247
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Product details
Overview
LM2677SD-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator IC with integrated 100-mΩ DMOS power switch, delivering up to 5 A output current. It supports adjustable output voltage from 1.2 V to 37 V, operates from 8 V to 40 V input, and achieves up to 92% efficiency in high-current industrial power conversion applications.
For engineers reviewing the LM2677SD-ADJ/NOPB datasheet, LM2677SD-ADJ/NOPB pinout, LM2677SD-ADJ/NOPB application, or LM2677SD-ADJ/NOPB equivalent, key selection considerations include its 260-kHz fixed-frequency oscillator, external SYNC capability (280–400 kHz), ±2% output voltage tolerance over line/load/temperature, 50-μA standby current, and thermal shutdown/current-limit protection.
Technical Context
The LM2677SD-ADJ/NOPB implements a voltage-mode PWM control architecture with an internal 260-kHz oscillator and optional external synchronization input (pin 5). Its feedback loop uses a two-stage, high-gain amplifier referenced to a 1.21-V internal bandgap, enabling precise output regulation via external resistor divider on the FB pin.
It integrates a high-side DMOS FET switch with 0.14-Ω typical RDS(ON) at 25°C, bootstrapped gate drive via CB pin (requiring 0.01-μF capacitor to VSW), and ON/OFF enable logic with 1.4-V threshold. Thermal shutdown and cycle-by-cycle current limiting (6.1–8.3 A) provide robust fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous - supports high-power loads without external current boosters |
| Input Voltage Range | 8 V to 40 V - compatible with 12 V/24 V industrial bus rails and wide-input battery systems |
| Output Voltage Range | 1.2 V to 37 V (adjustable) - set via external resistor divider on FB pin |
| Feedback Reference | 1.21 V ±1.2% - determines output accuracy; VOUT = 1.21 × (1 + R1/R2) |
| Switching Frequency | 260 kHz (internal) or 280–400 kHz (external SYNC) - enables consistent EMI filtering and smaller magnetics |
| Efficiency | Up to 92% - achieved via low-RDS(ON) DMOS switch and optimized gate drive |
| Standby Current | 50 μA - enables ultra-low-power shutdown for battery-backed systems |
| Thermal Protection | Integrated thermal shutdown - disables switch above 150°C junction temperature |
Pinout & Package
LM2677SD-ADJ/NOPB is packaged in a 7-pin TO-263 (DDPAK) surface-mount package with exposed thermal pad (DAP), measuring 10.16 mm × 8.69 mm. The DAP must be soldered to a PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch node output | Drives external inductor; swings from VIN to ~−0.5 V during off-time; requires low-inductance layout |
| VIN (Pins 2,3) | Power input | Connects to input bulk capacitor (CIN) and high-side FET collector; dual pins reduce trace resistance |
| CB (Pin 3) | Bootstrap capacitor connection | Requires 0.01-μF ceramic cap to VSW; supplies gate drive voltage >VIN for high-side FET turn-on |
| GND (Pin 4) | Power ground | Main return path for input/output capacitors and internal circuitry; must tie to low-impedance ground plane |
| SYNC (Pin 5) | External clock input | Accepts TTL/CMOS clock (280–400 kHz); overrides internal 260-kHz oscillator for EMI control |
| FB (Pin 6) | Feedback sense input | Connects to resistor divider midpoint; regulates output by comparing to 1.21-V reference |
| ON/OFF (Pin 7) | Enable/disable control | Logic-high (>1.4 V) enables regulation; logic-low (<0.8 V) enters 50-μA standby mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ DMOS switch | Enables 5-A output without external MOSFETs; reduces BOM count and layout complexity |
| ±2% output voltage tolerance | Guaranteed over full line (8–40 V), load (100 mA–5 A), and temperature (−40°C to +125°C) range |
| External SYNC input (280–400 kHz) | Allows precise ripple frequency positioning for EMI-sensitive comms/radio systems |
| 260-kHz fixed internal oscillator | Provides stable switching without external timing components; simplifies design for cost-sensitive apps |
| 50-μA standby quiescent current | Supports low-power sleep modes in portable/battery-powered equipment |
| Built-in protection suite | Includes thermal shutdown, cycle-by-cycle current limit, and under-voltage lockout |
Applications
| Industrial Power Supply | Communications Equipment |
|---|---|
|
Use Scenario: Primary 5-A DC/DC conversion in programmable logic controller (PLC) backplanes requiring stable 3.3 V or 5 V from 24 V rail. IC Role / Device Role / Timing Role: Step-down regulator providing regulated output with tight line/load regulation and thermal resilience. Use Value: Delivers 92% efficiency at 5 A, reducing heat sink requirements and enabling compact 7-pin TO-263 mounting. |
Use Scenario: Synchronized power supply for RF transceiver modules where output ripple frequency must align with system clock domain. IC Role / Device Role / Timing Role: Buck regulator with externally synchronized switching (280–400 kHz) to avoid spectral interference. Use Value: SYNC pin enables deterministic ripple placement, easing compliance with FCC Part 15 emissions limits. |
| Battery Charger Pre-regulator | Test & Measurement Instrumentation |
|
Use Scenario: High-current preregulator stage feeding linear regulators in multi-cell Li-ion battery chargers (12–36 V input). IC Role / Device Role / Timing Role: Efficient intermediate voltage converter stepping down wide-input battery voltage before LDO post-regulation. Use Value: 8–40 V input range accommodates varying battery states; 5-A capability supports fast-charging architectures. |
Use Scenario: Precision analog supply in benchtop oscilloscopes or signal generators requiring low-noise, stable 5 V or ±15 V rails. IC Role / Device Role / Timing Role: Main DC/DC converter with tight ±2% output tolerance and low standby current for power sequencing. Use Value: 50-μA shutdown current minimizes leakage during instrument standby; thermal shutdown prevents drift during extended operation. |
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-ADJ/NOPB | 3-A output, 150-kHz fixed frequency, no SYNC input, higher RDS(ON) (0.22 Ω) | Limited to lower-current applications; lacks EMI-synchronization capability | Choose when cost sensitivity outweighs current or EMI requirements |
| TPS54560QPWPRQ1 | 5-A, 100-V max input, 2.5–600 kHz adjustable frequency, integrated soft-start, automotive-grade (-40°C to +125°C) | Supports higher input voltages and automotive qualification; more complex compensation | Choose for automotive or >40 V input designs requiring AEC-Q100 compliance |
Compared with LM2677SD-ADJ/NOPB, LM2596T-ADJ/NOPB offers lower cost but sacrifices 40% output current and EMI control; TPS54560QPWPRQ1 extends input range and adds automotive reliability at the expense of design simplicity and footprint size.
Availability
LM2677SD-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, communications infrastructure, battery charging systems, and test equipment requiring stable component supply and long-term manufacturability.
Supply support for LM2677SD-ADJ/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 and embedded processing technologies with broad manufacturing scale and automotive/industrial qualification expertise.
The LM2677 series belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC regulators, designed specifically to simplify high-efficiency power supply design using minimal external components while maintaining robust thermal and fault protection.
FAQ
What is the maximum output current capability of the LM2677SD-ADJ/NOPB?
The LM2677SD-ADJ/NOPB delivers up to 5 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, adequate PCB copper area). Its current limit is specified from 5.75 A to 8.75 A across temperature, ensuring reliable overload handling without external current sensing.
Can the LM2677SD-ADJ/NOPB operate with an input voltage below 8 V?
No - the LM2677SD-ADJ/NOPB has a minimum recommended input voltage of 8 V per its Absolute Maximum Ratings and Recommended Operating Conditions. Operation below 8 V may result in failure to start, unstable regulation, or violation of internal bias requirements; the device includes under-voltage lockout to prevent erratic behavior.
How is the output voltage set for the LM2677SD-ADJ/NOPB?
The LM2677SD-ADJ/NOPB uses a resistor divider network connected between VOUT, FB, and GND to set output voltage. With a precise 1.21-V internal reference at the FB pin, VOUT = 1.21 × (1 + R1/R2). For example, R1 = 2.5 kΩ and R2 = 7.83 kΩ yields 5 V output. Layout must minimize noise coupling to the FB trace.
Does the LM2677SD-ADJ/NOPB require a bootstrap capacitor, and what value is recommended?
Yes - the LM2677SD-ADJ/NOPB requires a 0.01-μF (10 nF) ceramic capacitor connected between the CB pin and VSW pin to charge the high-side gate driver. This bootstrap capacitor enables full enhancement of the internal DMOS switch, minimizing conduction losses and sustaining high efficiency at 5-A load.
What protection features are built into the LM2677SD-ADJ/NOPB?
The LM2677SD-ADJ/NOPB integrates thermal shutdown (activates >150°C), cycle-by-cycle current limiting (6.1–8.3 A), and under-voltage lockout. It also provides 50-μA standby current in shutdown mode and internal clamp diodes on ON/OFF and SYNC pins. These features eliminate need for external protection circuitry in most applications.
LM2677SD-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 37V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM2677SD-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677SD-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM2677SD-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2677SD-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677SD-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677SD-ADJ/NOPB?
LM2677SD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677SD-ADJ/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-ADJ/NOPB?
For technical support, including LM2677SD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677SD-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2677SD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2677SD-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2677SD-ADJ/NOPB?
All LM2677SD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2677SD-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2677SD-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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