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Texas Instruments LM2670S-5.0/NOPB
- Part No.:
- LM2670S-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670S-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:472
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Product details
Overview
LM2670S-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3A output at fixed 5.0V, with 8–40V input range, 260kHz internal oscillator, ±2% output voltage tolerance, and 150mΩ DMOS high-side switch - used in battery chargers, communications equipment, and system preregulators.
For engineers reviewing the LM2670S-5.0/NOPB datasheet, LM2670S-5.0/NOPB pinout, LM2670S-5.0/NOPB application, or LM2670S-5.0/NOPB equivalent, key selection criteria include input voltage range, standby current, sync capability, thermal performance in TO-263 package, and fixed-output regulation accuracy under full load and temperature.
Technical Context
The LM2670S-5.0/NOPB implements a voltage-mode PWM controller with an integrated 150mΩ DMOS high-side switch, operating in continuous conduction mode up to 3A. Its 260kHz fixed-frequency oscillator enables predictable EMI behavior and simplifies filter design.
It supports external synchronization (280–400kHz), enabling precise ripple frequency control for RF-sensitive applications; shutdown mode reduces quiescent current to 50µA, and built-in thermal shutdown and current limiting ensure robust operation across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over full line, load, and temperature (–40°C to 125°C) |
| Input Voltage Range | 8V to 40V - supports wide industrial and automotive battery-derived supplies |
| Max Output Current | 3A continuous - sufficient for mid-power system rails without external pass devices |
| Switch RDS(ON) | 0.15Ω typical - minimizes conduction loss and improves efficiency at high load |
| Quiescent Current | 6mA typical in active mode; 50µA in shutdown - enables low-power standby states |
| Oscillator Frequency | 260kHz fixed internal; sync-capable up to 400kHz - balances efficiency, size, and EMI |
| Thermal Shutdown | Integrated - protects against sustained overload or poor heatsinking in TO-263 package |
Pinout & Package
LM2670S-5.0/NOPB is packaged in KTW (TO-263-7), a thermally enhanced surface-mount variant of TO-220 with exposed thermal pad. The 10.1mm × 15.24mm outline and integrated DAP require PCB copper area for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS FET - connects directly to inductor and external Schottky diode cathode; high dv/dt node requiring careful layout |
| 2 (VIN) | Input supply | Main power input (8–40V); must be bypassed with low-ESR capacitor placed adjacent to pin for stable high-frequency operation |
| 3 (CBOOST) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor - provides gate drive voltage > VIN to fully enhance high-side FET |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and thermal pad - requires low-inductance connection to system ground plane |
| 5 (SYNC) | Synchronization input | Accepts external TTL/CMOS clock (280–400kHz); overrides internal oscillator for EMI control and spectral positioning |
| 6 (FB) | Feedback sense | Internally connected to 5.0V reference - shorted directly to output capacitor for fixed-voltage operation |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4V = ON, ≤0.8V = OFF; pulls to ~20µA internal current source when floating |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5.0V output | Eliminates external feedback resistor network - reduces BOM count and layout sensitivity for standard rail generation |
| External sync capability | Enables deterministic ripple frequency placement - critical for meeting conducted EMI limits in comms/radio systems |
| 150mΩ DMOS switch | Reduces conduction losses at 3A load - achieves >88% efficiency at 12VIN/5VOUT, easing thermal management |
| 50µA shutdown current | Supports ultra-low-power system sleep modes - extends battery life in portable chargers and remote sensors |
| Integrated protection | Thermal shutdown + current limit + under-voltage lockout - ensures fault resilience without external supervision circuitry |
Applications
| Battery Charger Preregulator | Communications Equipment Power Supply |
|---|---|
Use Scenario: Step-down conversion from 24V lead-acid or 12V LiFePO₄ battery to stable 5V rail feeding USB charging ICs and microcontrollers. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V output with tight tolerance and low ripple for sensitive analog/USB PHY circuits. Use Value: Fixed 5.0V output eliminates feedback tuning; 50µA shutdown enables deep-sleep battery conservation between charge cycles. | Use Scenario: Local 5V supply for RF transceiver modules and baseband processors in land-mobile radios or cellular repeaters. IC Role / Device Role / Timing Role: Synchronized buck converter whose 280–400kHz switching frequency avoids interference with IF bands and enables repeatable EMI filtering. Use Value: External SYNC pin allows alignment of switching harmonics away from critical receive bands - verified in TI reference designs for radio applications. |
| Industrial PLC I/O Module Rail | Automotive Aftermarket Display System |
Use Scenario: Generating 5V from wide-range 9–36V vehicle or 24V industrial bus for digital I/O logic, isolation drivers, and sensor interfaces. IC Role / Device Role / Timing Role: Robust buck regulator handling input transients and cold-crank conditions while maintaining regulation during load steps. Use Value: 8–40V input range accommodates automotive load-dump and brownout events; thermal shutdown prevents latch-up during ambient temperature excursions. | Use Scenario: Powering 5V LCD controllers, touch controllers, and CAN interface ICs in aftermarket infotainment displays powered from vehicle battery. IC Role / Device Role / Timing Role: High-efficiency preregulator stepping down noisy 12V automotive supply before LDOs or point-of-load converters. Use Value: 94% peak efficiency (at 12V→5V/3A) minimizes heat buildup in sealed enclosures; TO-263 package enables direct heatsink mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671-5.0/NOPB | Same pinout, 1A output rating, lower RDS(ON) (130mΩ), no SYNC pin | Lower current capacity; unsuitable for >1A loads but smaller solution size | Select when 1A max load suffices and sync is unnecessary - reduces cost and complexity |
| TPS54302DDCR | 3A synchronous buck, 4.5–28V input, 5V fixed, 2.5MHz switching, no SYNC | Higher frequency enables smaller magnetics; lacks external sync and wider input range | Prefer for space-constrained designs needing compact inductors; avoid where EMI spectral control is mandatory |
Compared with LM2671-5.0/NOPB and TPS54302DDCR, the LM2670S-5.0/NOPB uniquely combines 3A capability, 8–40V input, and external synchronization - making it optimal for industrial and communications systems requiring both robustness and EMI predictability.
Availability
LM2670S-5.0/NOPB is available at Aetrix Electronics and suitable for battery chargers, communications equipment, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2670S-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 leader designing analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM2670 series belongs to TI's SIMPLE SWITCHER® power converter family - engineered for ease of use in non-isolated DC-DC buck applications where high efficiency, minimal external components, and thermal reliability are prioritized.
FAQ
What is the maximum input voltage rating for the LM2670S-5.0/NOPB?
The LM2670S-5.0/NOPB has an absolute maximum input voltage rating of 45V, with recommended operating range from 8V to 40V. Exceeding 40V continuously risks exceeding thermal limits or violating safe operating area, especially under high load. The 45V absolute max is a stress rating - not intended for functional operation - and prolonged exposure may impact reliability. Always verify transient conditions (e.g., load dump) against this limit in automotive or industrial designs using LM2670S-5.0/NOPB.
Does the LM2670S-5.0/NOPB require external feedback resistors?
No, the LM2670S-5.0/NOPB does not require external feedback resistors. As a fixed 5.0V output variant, it integrates internal resistor dividers that connect the FB pin to an internal 1.21V reference. The FB pin must be connected directly to the output capacitor's positive terminal to close the regulation loop. Adding external resistors would disrupt the factory-trimmed output accuracy and is not supported - doing so may cause overvoltage or instability in the LM2670S-5.0/NOPB.
Can the LM2670S-5.0/NOPB synchronize to an external clock?
Yes, the LM2670S-5.0/NOPB supports external synchronization via its SYNC pin (Pin 5). It accepts TTL- or CMOS-compatible square-wave clocks from 280kHz to 400kHz - higher than its internal 260kHz oscillator - to precisely control switching frequency and output ripple spectrum. This feature is explicitly documented in the datasheet for EMI management in communications and radio equipment. When using SYNC, note that current-limit foldback is disabled, so short-circuit protection relies solely on cycle-by-cycle current limiting in the LM2670S-5.0/NOPB.
What package type is used for the LM2670S-5.0/NOPB?
The LM2670S-5.0/NOPB is supplied in the KTW package: a 7-pin TO-263 variant with an exposed thermal pad (DAP). Its nominal footprint is 10.1mm × 15.24mm, and the DAP must be soldered to a dedicated PCB copper pour for thermal performance. This package differs from the NDZ (TO-220-7) and NHM (VSON-14) variants - only KTW is assigned to the LM2670S-5.0/NOPB orderable part number per TI's packaging documentation.
What is the typical efficiency of the LM2670S-5.0/NOPB at full load?
The LM2670S-5.0/NOPB achieves 88% typical efficiency at 12V input and 3A output load, as specified in Section 5.6 of the datasheet. Efficiency varies with input voltage and load: it reaches up to 94% at 24V→12V (for the 12V variant), but for LM2670S-5.0/NOPB specifically, peak efficiency occurs near mid-input range (e.g., 15–24V). At light loads (<100mA), efficiency drops due to fixed switching losses, but the 50µA shutdown current preserves battery life when disabled.
LM2670S-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- 3A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2670S-5.0/NOPB FAQ
1.How can I place an order for LM2670S-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670S-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 LM2670S-5.0/NOPB reliable?
The price and inventory of LM2670S-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 LM2670S-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2670S-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670S-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670S-5.0/NOPB?
LM2670S-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670S-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 LM2670S-5.0/NOPB?
For technical support, including LM2670S-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670S-5.0/NOPB requirements.
6.How does Aetrix verify that LM2670S-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2670S-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 LM2670S-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2670S-5.0/NOPB?
All LM2670S-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2670S-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 LM2670S-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2670S-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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