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Texas Instruments LM2595SX-5.0/NOPB
- Part No.:
- LM2595SX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595SX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,060
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Product details
Overview
LM2595SX-5.0/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 1 A output current with fixed 5-V output, ±4% output voltage tolerance over line and load, 4.5–40 V input range, and integrated thermal shutdown and current-limit protection - used in industrial power supplies and embedded system point-of-load regulation.
For engineers reviewing the LM2595SX-5.0/NOPB datasheet, LM2595SX-5.0/NOPB pinout, LM2595SX-5.0/NOPB application, or LM2595SX-5.0/NOPB equivalent, key selection criteria include guaranteed 1-A load capability, TO-263-5 surface-mount package compatibility, TTL-compatible ON/OFF control, 85 μA standby current, and fixed-frequency operation enabling predictable EMI filtering.
Technical Context
The LM2595SX-5.0/NOPB implements a nonsynchronous buck topology with an internal NPN power switch, fixed 150-kHz oscillator (±15% tolerance), and internal frequency compensation - eliminating need for external compensation components. Feedback is taken directly from the regulated 5-V output via the FB pin, with 1.23-V reference voltage and 50-nA typical bias current.
It operates in continuous conduction mode under full load (1 A) at typical input voltages (e.g., 12 V), but supports discontinuous mode at light loads. Protection includes two-stage current limiting (1.2–2.4 A peak) and thermal shutdown at 150°C junction temperature, with self-recovery after fault clearance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±4% over full line/load/temperature range - ensures stable logic supply without external resistor divider. |
| Max Output Current | 1 A DC - supports single-rail microcontroller, FPGA I/O, or sensor subsystems without derating at 50°C ambient. |
| Input Voltage Range | 4.5 V to 40 V - accommodates 5 V, 12 V, 24 V, and 36 V industrial bus rails with margin for transients. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, high-saturation-current off-the-shelf inductors (e.g., 68–100 μH) and reduces EMI filter size vs. lower-frequency regulators. |
| Standby Current | 85 μA typical - allows low-power shutdown in battery-backed systems without significant quiescent drain. |
| Efficiency | 82% typical at VIN = 12 V, IOUT = 1 A - minimizes thermal rise in compact TO-263 packages without heatsink below 50°C ambient. |
| Thermal Resistance | RθJA = 50°C/W (TO-263 on 0.5 in² copper) - defines PCB copper area requirement for thermal compliance at full load. |
Pinout & Package
LM2595SX-5.0/NOPB is housed in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad (10.16 mm × 8.42 mm body). The package supports solder reflow and provides low thermal resistance to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal NPN switch collector | Swings between (VIN − VSAT) and ~−0.5 V; requires minimal PCB copper area to reduce EMI coupling into sensitive analog circuits. |
| 2 - +VIN | Positive input supply | Accepts 4.5–40 V; must be bypassed with low-ESR capacitor placed adjacent to pin to supply high di/dt switching current. |
| 3 - Ground | Power and signal reference | Common return for internal circuitry and external catch diode; connects to thermal pad for heat dissipation. |
| 4 - Feedback | Regulation sense input | Monitors 5-V output directly (no divider); 1.23-V internal reference sets regulation point - simplifies layout and improves accuracy. |
| 5 - ON/OFF | TTL-compatible enable control | Pull ≤1.3 V to enable; pull ≥1.3 V to enter 85-μA standby - supports microcontroller GPIO or system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5-V output | Eliminates external feedback resistors - reduces BOM count, layout complexity, and voltage-divider drift errors. |
| 150-kHz fixed-frequency operation | Enables deterministic EMI filtering design and consistent inductor sizing across designs using standard 68–100 μH parts. |
| TTL shutdown with 85-μA standby | Allows clean system-level power gating without auxiliary LDOs or discrete MOSFETs - critical for portable and energy-certified equipment. |
| Integrated thermal shutdown & current limit | Prevents catastrophic failure during overload or poor heatsinking - no external protection circuitry required for basic reliability. |
| Requires only 4 external components | Needs only input cap, output cap, catch diode, and inductor - accelerates prototyping and reduces bill-of-materials validation effort. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Providing regulated 5-V rail for microcontroller, CAN transceiver, and sensor interface in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24-V DC field bus to stable 5-V logic supply with ripple < 100 mVpp. Use Value: Delivers full 1-A load without heatsink at 50°C ambient, reducing enclosure size and cost versus linear regulators. | Use Scenario: Generating 5-V supply for door module MCU and LIN transceivers in 12-V automotive battery systems. IC Role / Device Role / Timing Role: Buck converter handling cold-crank (4.5 V) to load-dump (40 V) transients while maintaining regulation. Use Value: Wide 4.5–40 V input range and built-in overvoltage/overcurrent protection eliminate need for upstream TVS or fuse coordination. |
| Medical Patient Monitor Auxiliary Rail | IoT Gateway Power Management |
Use Scenario: Creating isolated 5-V auxiliary supply for display backlight drivers and USB peripheral ports in Class II medical devices. IC Role / Device Role / Timing Role: Secondary non-isolated regulator fed from main 12-V intermediate bus, operating at fixed 150-kHz frequency. Use Value: 82% efficiency at 1 A minimizes heat generation near temperature-sensitive sensors and avoids fan cooling. | Use Scenario: Powering Wi-Fi SoC, memory, and real-time clock in battery-backed smart home gateways. IC Role / Device Role / Timing Role: Main system regulator with ON/OFF pin controlled by host MCU to enter ultra-low-power sleep states. Use Value: 85-μA standby current extends battery life during multi-day deep-sleep cycles without compromising wake-up responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2595T-5.0 | TO-220-5 through-hole package; higher RθJA (50°C/W on minimal copper) - requires heatsink above 0.5 A at 70°C ambient. | Suitable for prototyping or low-volume assemblies where manual soldering is preferred; not recommended for high-density SMT production. | Select LM2595T-5.0 only when board assembly process does not support TO-263 reflow or thermal pad soldering. |
| LM2678-5.0 | Higher 2.5-A output rating; 260-kHz switching frequency; requires external compensation - more complex layout and higher component count. | Used where future load growth or parallel operation is anticipated; not drop-in compatible due to different pinout and compensation requirements. | Choose LM2678-5.0 only if >1 A output or tighter transient response is required - otherwise LM2595SX-5.0/NOPB offers simpler, proven design. |
Compared with LM2595T-5.0, LM2595SX-5.0/NOPB enables higher power density and automated assembly; compared with LM2678-5.0, it trades peak current headroom for reduced design complexity, fewer external parts, and lower system cost in 1-A applications.
Availability
LM2595SX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device power supply designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for LM2595SX-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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2595 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for cost-sensitive, space-constrained applications needing robust, easy-to-implement DC-DC conversion without complex compensation or external FETs.
FAQ
What is the maximum input voltage rating for LM2595SX-5.0/NOPB?
The absolute maximum input voltage for LM2595SX-5.0/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Operation above 40 V risks exceeding internal transistor breakdown limits and may trigger overvoltage stress even before thermal shutdown activates. For sustained reliability, maintain VIN ≤ 40 V with appropriate input transient suppression per IEC 61000-4-5.
Does LM2595SX-5.0/NOPB require an external feedback resistor network?
No, LM2595SX-5.0/NOPB does not require external feedback resistors. It is a fixed 5-V output variant with internal resistor divider and 1.23-V reference, so the FB pin connects directly to the output. This eliminates resistor tolerance errors, temperature drift, and layout sensitivity - a key advantage over adjustable versions like LM2595ADJ.
Can LM2595SX-5.0/NOPB operate without a heatsink in a TO-263 package?
Yes, LM2595SX-5.0/NOPB can operate without an external heatsink when delivering 1 A at ambient temperatures below 50°C and with ≥0.5 in² of 1-oz copper connected to the thermal pad. At higher ambient temperatures or with limited PCB copper, thermal performance must be verified using RθJA = 50°C/W (per datasheet Table 7.4) and junction temperature must remain below 150°C.
What is the purpose of the ON/OFF pin on LM2595SX-5.0/NOPB?
The ON/OFF pin on LM2595SX-5.0/NOPB provides TTL-compatible enable control: pulling the pin ≤1.3 V enables regulation, while pulling it ≥1.3 V places LM2595SX-5.0/NOPB in 85-μA standby mode. If unused, the pin may be tied to GND or left floating - both configurations default to enabled operation, simplifying designs without active sequencing.
Is LM2595SX-5.0/NOPB pin-compatible with other LM2595 fixed-output variants?
Yes, LM2595SX-5.0/NOPB is pin-compatible with LM2595SX-3.3/NOPB, LM2595SX-12/NOPB, and LM2595SX-ADJ/NOPB in the same TO-263-5 package. All share identical pinout (Output, +VIN, GND, FB, ON/OFF), allowing hardware reuse across output voltage variants - only the feedback network (or lack thereof) differs internally.
LM2595SX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2595SX-5.0/NOPB FAQ
1.How can I place an order for LM2595SX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595SX-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 LM2595SX-5.0/NOPB reliable?
The price and inventory of LM2595SX-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 LM2595SX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595SX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595SX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595SX-5.0/NOPB?
LM2595SX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595SX-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 LM2595SX-5.0/NOPB?
For technical support, including LM2595SX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595SX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2595SX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595SX-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 LM2595SX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595SX-5.0/NOPB?
All LM2595SX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595SX-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 LM2595SX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2595SX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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