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Texas Instruments LM2677T-ADJ/NOPB
- Part No.:
- LM2677T-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2677T-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,227
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Product details
Overview
LM2677T-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC with an internal 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-power industrial power supplies.
For engineers reviewing the LM2677T-ADJ/NOPB datasheet, LM2677T-ADJ/NOPB pinout, LM2677T-ADJ/NOPB application, or LM2677T-ADJ/NOPB equivalent, key selection criteria include its ±2% output tolerance over line/load/temperature, 260-kHz fixed-frequency operation (or external sync up to 400 kHz), thermal shutdown, current limiting, and ON/OFF control with 50-μA standby current.
Technical Context
The LM2677T-ADJ/NOPB implements a voltage-mode PWM controller with a 260-kHz internal oscillator (225–280 kHz over temperature) and supports external synchronization from 280 kHz to 400 kHz. Its feedback loop uses a precision 1.21-V reference and two-stage transconductance amplifier for stable regulation across 1.2 V–37 V outputs.
It integrates a high-side DMOS switch with 0.14 Ω typical RDS(ON) at 25°C, bootstrapped gate drive via CB pin, and built-in protection including thermal shutdown, cycle-by-cycle current limiting (6.1–8.75 A), and ON/OFF enable logic with 1.4-V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous - supports high-current loads without external pass devices |
| Input Voltage Range | 8 V to 40 V - suitable for 12 V/24 V industrial bus, battery, and automotive-derived supplies |
| 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% - enables precise output programming with minimal drift over temperature |
| Switch RDS(ON) | 0.14 Ω max at 25°C - reduces conduction loss and improves efficiency at full load |
| Efficiency | Up to 92% - achieved via low-RDS(ON) switch and optimized control architecture |
| Standby Current | 50 μA - enables ultra-low-power shutdown mode for system-level energy management |
Pinout & Package
LM2677T-ADJ/NOPB is packaged in a 7-pin TO-263 (KTW) thermally enhanced surface-mount package with exposed thermal pad, measuring 10.16 mm × 8.69 mm. The package supports high-power dissipation with RθJA as low as 26°C/W when mounted on ≥1.0064 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW | Switch node output | Drives external inductor; swings between VIN and ~−0.5 V during off-time - requires low-inductance layout |
| VIN | Power input | Supplies high-side switch and internal bias; must be decoupled with low-ESR capacitor near pin |
| CB | Bootstrap capacitor connection | Connects 0.01 μF ceramic capacitor to VSW to generate gate drive voltage > VIN for full MOSFET enhancement |
| GND | Power ground | Common return for input/output capacitors, feedback network, and thermal pad - must tie to solid ground plane |
| SYNC | External clock input | Accepts TTL/CMOS clock (280–400 kHz); overrides internal 260-kHz oscillator for EMI control or spectral alignment |
| FB | Feedback sense input | High-impedance input (85 nA bias) referenced to 1.21 V - sets output via resistor divider (R1/R2) |
| ON/OFF | Enable control input | Logic-level enable: >1.4 V = active, <0.8 V = shutdown; internal 20-μA pullup allows floating for always-on operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ DMOS switch | Eliminates need for external high-current MOSFET and driver, reducing BOM count and layout complexity |
| ±2% output voltage tolerance | Ensures tight regulation across full line, load, and temperature range without post-production trimming |
| External sync capability (280–400 kHz) | Enables deterministic ripple frequency placement for EMI filtering and multi-rail synchronization |
| Thermal shutdown + current limit | Provides autonomous fault protection under overload, short-circuit, or overheating conditions |
| 50-μA standby quiescent current | Supports low-power system states while retaining fast wake-up response (<100 μs typical startup) |
Applications
| Industrial Power Supply | Battery Charger Controller |
|---|---|
Use Scenario: 24 V bus-powered PLC I/O module requiring regulated 5 V/3.3 V rails with high transient load immunity. IC Role / Device Role / Timing Role: Primary buck regulator delivering 5 A at 5 V; provides stable, low-noise supply independent of input bus fluctuations. Use Value: 92% efficiency minimizes heat sink requirements; ±2% tolerance ensures downstream logic reliability under wide temperature range. | Use Scenario: 36 V lithium-ion battery pack charger with programmable constant-voltage stage and thermal foldback. IC Role / Device Role / Timing Role: Adjustable-output preregulator stepping down from battery to charge-management IC input; ON/OFF pin enables charge termination signaling. Use Value: 1.21-V reference and FB pin accuracy allow precise CV setpoint; 50-μA shutdown current extends battery shelf life. |
| Communications Equipment | Ruggedized Embedded System |
Use Scenario: Synchronized power rail in RF transceiver board where switching noise must avoid sensitive IF bands. IC Role / Device Role / Timing Role: Sync-controlled buck converter locked to system clock to fix ripple at known frequency for predictable filter design. Use Value: External SYNC input enables exact ripple frequency positioning (e.g., 350 kHz), avoiding interference with 300–400 MHz receive band. | Use Scenario: Harsh-environment vehicle-mounted data logger needing reliable 12 V → 3.3 V conversion across −40°C to +125°C. IC Role / Device Role / Timing Role: High-reliability buck regulator with integrated thermal shutdown and wide-junction-temp operation (−40°C to 125°C). Use Value: Guaranteed performance over full automotive temperature range; TO-263 package enables robust thermal coupling to chassis ground. |
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 current, 150-kHz fixed frequency, higher RDS(ON) (0.22 Ω), no SYNC input | Limited to lower-power applications; lacks frequency synchronization for EMI-sensitive designs | Select when cost sensitivity outweighs current or EMI requirements |
| TPS54560QPWPRQ1 | 5 A output, 100 kHz–2.5 MHz adjustable frequency, integrated soft-start, higher quiescent current (110 μA) | Automotive-qualified (AEC-Q100), wider input range (3.5 V–60 V), but requires more external components | Select for automotive-grade reliability or ultra-wide input voltage needs |
Compared with LM2596T-ADJ/NOPB, LM2677T-ADJ/NOPB delivers 67% higher current and adds SYNC capability for EMI control; versus TPS54560QPWPRQ1, it offers lower IQ and simpler implementation but lacks automotive qualification and frequency flexibility.
Availability
LM2677T-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery charging systems, communications equipment, and ruggedized embedded designs requiring stable component supply and long-term manufacturability.
Supply support for LM2677T-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 specializing in analog and embedded processing technologies, with leadership in power management ICs and broad industrial design support infrastructure.
The LM2677 series belongs to TI's SIMPLE SWITCHER® family - designed for ease of use in high-efficiency, medium-power DC-DC conversion with minimal external components and robust thermal/overload protection.
FAQ
What is the maximum output voltage that can be set using LM2677T-ADJ/NOPB?
The LM2677T-ADJ/NOPB supports an adjustable output voltage range from 1.2 V to 37 V, determined by the external resistor divider connected to the FB pin and referenced to its internal 1.21-V precision bandgap. This range is validated across the full operating temperature and load conditions specified in the datasheet, and the upper limit is constrained by absolute maximum ratings of the internal circuitry.
Does LM2677T-ADJ/NOPB require an external bootstrap capacitor, and what value is recommended?
Yes, LM2677T-ADJ/NOPB requires a 0.01 μF (10 nF) high-quality ceramic capacitor connected between the CB pin and VSW pin to provide gate drive voltage above VIN for the internal high-side DMOS switch. This bootstrap configuration ensures full enhancement of the switch, minimizing RDS(ON) and maintaining high efficiency across the full load range.
Can LM2677T-ADJ/NOPB synchronize to an external clock, and what is the supported frequency range?
Yes, LM2677T-ADJ/NOPB accepts an external TTL- or CMOS-compatible clock signal on the SYNC pin, supporting frequencies from 280 kHz to 400 kHz. This capability overrides the internal 260-kHz oscillator and enables precise control of switching ripple frequency for EMI mitigation and multi-rail synchronization - critical in communications and radio equipment.
What is the standby current of LM2677T-ADJ/NOPB when the ON/OFF pin is pulled low?
When the ON/OFF pin is driven below 0.8 V, LM2677T-ADJ/NOPB enters shutdown mode with a typical standby current of 50 μA and a maximum of 100 μA over temperature. This ultra-low quiescent current enables energy-efficient system-level power gating without compromising fast wake-up performance.
Is LM2677T-ADJ/NOPB RoHS-compliant and lead-free?
Yes, LM2677T-ADJ/NOPB is RoHS-compliant and lead-free, as indicated by the "/NOPB" suffix in the part number per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and is qualified for standard reflow soldering processes.
LM2677T-ADJ/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:
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2677T-ADJ/NOPB FAQ
1.How can I place an order for LM2677T-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677T-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 LM2677T-ADJ/NOPB reliable?
The price and inventory of LM2677T-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 LM2677T-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2677T-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677T-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677T-ADJ/NOPB?
LM2677T-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677T-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 LM2677T-ADJ/NOPB?
For technical support, including LM2677T-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677T-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2677T-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2677T-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 LM2677T-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2677T-ADJ/NOPB?
All LM2677T-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2677T-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 LM2677T-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2677T-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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