My Inquiry
My Account
Texas Instruments LM2670S-5.0
- Part No.:
- LM2670S-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2670S-5.0.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,526
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2670S-5.0 from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3 A output current with fixed 5 V output, 8–40 V input range, ±2% output voltage tolerance, and 88% typical efficiency at 12 VIN/3 A. It integrates a 150 mΩ DMOS high-side switch and supports external clock synchronization for EMI control in communications and radio equipment.
For engineers reviewing the LM2670S-5.0 datasheet, LM2670S-5.0 pinout, LM2670S-5.0 application, or LM2670S-5.0 equivalent, key selection criteria include its 260 kHz internal oscillator, 50 µA standby current in shutdown mode, thermal shutdown and current limiting protection, and compatibility with off-the-shelf inductors and Schottky diodes for rapid design implementation.
Technical Context
The LM2670S-5.0 implements a voltage-mode PWM controller with a fixed 260 kHz internal oscillator or externally synchronized operation from 280–400 kHz. Its high-side DMOS switch operates with 0.15 Ω typical RDS(ON), enabling high-efficiency conversion across its full 8–40 V input range and –40°C to 125°C junction temperature range.
It features an integrated feedback amplifier referenced to a 1.21 V internal bandgap, requiring no external resistor divider for the fixed 5 V version. The ON/OFF pin provides TTL/CMOS-compatible enable control with 1.4 V threshold and 20 µA input bias, while SYNC pin accepts AC-coupled external clocks to precisely position output ripple spectrum.
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 | 3 A continuous; current limit set at 3.8–5.25 A with thermal foldback |
| Input Voltage Range | 8 V to 40 V - supports wide industrial and battery-derived supplies |
| Efficiency | 88% typical at 12 VIN, 3 A load - enables compact thermal design |
| Switch RDS(ON) | 0.15 Ω typical - reduces conduction loss and improves full-load efficiency |
| Standby Current | 50 µA max when ON/OFF pin = 0 V - enables low-power system sleep modes |
| Oscillator Frequency | 260 kHz fixed internal; sync-capable from 280–400 kHz - allows EMI filtering optimization |
Pinout & Package
LM2670S-5.0 is available in KTW (TO-263-7) package: thermally enhanced surface-mount variant with exposed thermal pad, 10.1 mm × 15.24 mm footprint, and 7-pin configuration optimized for high-current power delivery and PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | Drain node of internal high-side DMOS FET; connects to inductor and Schottky diode cathode - high dv/dt node requiring tight layout |
| 2 (VIN) | Input Supply | Main power input (8–40 V); must be bypassed with low-ESR capacitor placed adjacent to pin - critical for stability and noise suppression |
| 3 (CBOOST) | Bootstrap Capacitor | Connects 100 nF ceramic capacitor to SW pin to generate gate drive > VIN for full FET enhancement - enables low RDS(ON) |
| 4 (GND) | Power Ground | Primary return path for input/output capacitors and thermal pad - requires low-inductance connection to large copper area |
| 5 (SYNC) | Sync Input | Accepts external 280–400 kHz clock to lock switching frequency - eliminates beat frequencies and simplifies EMI filter design |
| 6 (FB) | Feedback Input | Internally tied to 5 V output divider - no external resistors needed; senses regulated output for closed-loop control |
| 7 (ON/OFF) | Enable Control | TTL/CMOS-compatible shutdown input; < 0.8 V disables regulator, drawing only 50 µA - supports system-level power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150 mΩ DMOS Switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity |
| External Clock Synchronization | Enables precise ripple frequency control for consistent EMI filtering and spectral placement in comms/radio systems |
| 260 kHz Fixed Internal Oscillator | Provides stable timing without external components - balances efficiency, size, and EMI performance |
| Thermal Shutdown & Current Limit | Protects against overload and overheating during transient conditions without external circuitry |
| WEBENCH® Power Designer Support | Generates complete schematics, bill-of-materials, and performance simulations directly from TI's online tool |
Applications
| Industrial Power Preregulation | Battery-Powered Equipment |
|---|---|
Use Scenario: Pre-regulating unregulated 24 V rail before LDOs powering sensitive analog or digital ICs in factory automation controllers. IC Role / Device Role / Timing Role: Primary buck converter providing stable 5 V at up to 3 A with minimal dropout and high PSRR contribution via clean switching waveform. Use Value: Delivers >88% efficiency at full load, reducing heat sink requirements and enabling compact DIN-rail mounted enclosures. | Use Scenario: Powering microcontroller, display, and sensors in portable test equipment powered by 12–36 V Li-ion battery packs. IC Role / Device Role / Timing Role: Main system regulator converting variable battery voltage to fixed 5 V, with ON/OFF pin enabling deep-sleep mode between measurements. Use Value: 50 µA shutdown current extends battery life; wide 8–40 V input accommodates full battery discharge curve without intermediate stages. |
| Communications Baseband Supply | Radio Transceiver Bias |
Use Scenario: Generating clean 5 V supply for FPGA-based baseband processing in point-to-point wireless links. IC Role / Device Role / Timing Role: Synchronized buck regulator locked to system clock to eliminate subharmonic interference in ADC/DAC signal chains. Use Value: SYNC pin enables deterministic ripple frequency placement outside sensitive IF bands, easing compliance with EN 55022 Class B. | Use Scenario: Providing 5 V bias to RF front-end ICs and PA drivers in UHF handheld radios operating from 12–28 V vehicle power. IC Role / Device Role / Timing Role: High-current, thermally robust regulator with integrated current limit protecting against antenna mismatch or PA fault conditions. Use Value: TO-263 package with thermal pad ensures reliable 3 A operation under sustained TX duty cycles without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-5.0 | Lower 1.5 A rating, 150 kHz fixed frequency, no SYNC capability, higher RDS(ON) (0.22 Ω) | Suitable for lower-current, cost-sensitive designs where EMI control is less critical | Select LM2596S-5.0 only if 3 A output and external sync are not required - verify thermal margin at full load |
| TPS54302DDAR | 3 A synchronous buck, 2.5–6 V input, 500 kHz switching, integrated high/low-side FETs, no SYNC pin | Better suited for low-input-voltage systems (e.g., 5 V bus) but incompatible with 8–40 V industrial inputs | Choose TPS54302DDAR only for 5 V input rails; LM2670S-5.0 remains preferred for wide-input, high-reliability applications |
Compared with LM2596S-5.0 and TPS54302DDAR, the LM2670S-5.0 uniquely combines 3 A capability, 8–40 V input range, external sync support, and TO-263 thermal performance - making it optimal for industrial and communications power supplies where input variability and EMI control are critical.
Availability
LM2670S-5.0 is available at Aetrix Electronics and suitable for industrial power preregulation, battery-powered instrumentation, communications baseband supplies, and radio transceiver bias requiring stable component supply and long-term manufacturability.
Supply support for LM2670S-5.0 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 specializing in analog, embedded processing, and power management technologies with decades of expertise in high-reliability power conversion ICs.
The LM2670 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, high-efficiency, and robustness in industrial, communications, and battery-powered DC-DC conversion applications without requiring complex compensation networks.
FAQ
What is the maximum input voltage rating for the LM2670S-5.0?
The LM2670S-5.0 has an absolute maximum input voltage rating of 45 V, with recommended operating range from 8 V to 40 V. Exceeding 40 V continuously may reduce reliability or trigger overvoltage protection mechanisms not explicitly specified in the datasheet. Always maintain input transients within the 45 V absolute maximum limit per the Absolute Maximum Ratings table.
Does the LM2670S-5.0 require external feedback resistors to set its output voltage?
No - the LM2670S-5.0 is the fixed 5 V output version, so internal resistor dividers configure the feedback network. Pin 6 (FB) connects directly to the output capacitor; no external resistors are needed. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy.
Can the LM2670S-5.0 synchronize to an external clock, and what frequency range is supported?
Yes, the LM2670S-5.0 supports external synchronization via its SYNC pin (Pin 5). It accepts TTL- or CMOS-compatible clocks from 280 kHz to 400 kHz. The external frequency must exceed the internal oscillator's maximum (280 kHz) to avoid erratic operation; sync signals below this threshold may cause instability or loss of regulation.
What thermal performance can be expected from the LM2670S-5.0 in the KTW (TO-263) package?
In the KTW package with proper PCB copper area (≥0.4896 in² of 1 oz copper), the LM2670S-5.0 achieves a junction-to-ambient thermal resistance (RθJA) of 35°C/W. At 3 A output and 88% efficiency, power dissipation is ~2 W - resulting in ~70°C junction rise above ambient, well within the –40°C to 125°C operating range when ambient stays below 55°C.
How does the ON/OFF pin function on the LM2670S-5.0, and what is its threshold voltage?
The ON/OFF pin (Pin 7) enables or disables the LM2670S-5.0. A voltage ≥1.4 V turns the device ON; <0.8 V forces shutdown with 50 µA standby current. The pin includes an internal 20 µA pull-up and 7 V Zener clamp. For reliable operation, drive it with logic-level signals and avoid exceeding 6 V absolute maximum to prevent damage.
LM2670S-5.0 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2670S-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2670S-5.0 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 reliable?
The price and inventory of LM2670S-5.0 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 is usually 5 days.
3.What payment methods are accepted for LM2670S-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2670S-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2670S-5.0?
LM2670S-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2670S-5.0 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?
For technical support, including LM2670S-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2670S-5.0 requirements.
6.How does Aetrix verify that LM2670S-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2670S-5.0 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 meets industry standards.
7.What is the process for return or replacement of LM2670S-5.0?
All LM2670S-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2670S-5.0, 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 part is unused and in its original packaging.
Return procedure for LM2670S-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2670S-5.0 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
