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Texas Instruments LM2595S-3.3/NOPB
- Part No.:
- LM2595S-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595S-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:164
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Product details
Overview
LM2595S-3.3/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering up to 1 A output current with fixed 3.3-V output, ±4% output voltage tolerance over line and load, 4.5–40 V input range, and integrated thermal shutdown/current-limit protection. It serves as a primary buck regulator in industrial power supplies and embedded system rails.
For engineers reviewing the LM2595S-3.3/NOPB datasheet, LM2595S-3.3/NOPB pinout, LM2595S-3.3/NOPB application, or LM2595S-3.3/NOPB equivalent, key selection criteria include output accuracy at full load, thermal performance in TO-263 without heatsink, standby current under TTL shutdown, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2595S-3.3/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single chip. Its fixed 150-kHz oscillator enables compact external filter design using standard inductors, while the nonsynchronous architecture uses an external catch diode for cost-effective 1-A conversion.
Operation relies on feedback from the FB pin sensing output voltage via internal 1.23-V reference; regulation error triggers duty-cycle adjustment of the internal NPN switch. Shutdown is implemented via TTL-compatible ON/OFF pin (1.3-V threshold), reducing quiescent current to 85 μA in standby mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (3.168–3.432 V) over full line/load/temperature range - ensures stable logic rail compliance. |
| Max Output Current | 1 A DC - supports microcontroller cores, FPGAs, and peripheral ICs without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - accommodates 5-V, 12-V, 24-V, and unregulated battery or adapter inputs. |
| Switching Frequency | 150 kHz (±15%) - enables use of low-cost, high-saturation-current inductors with minimal EMI filtering. |
| Efficiency | 78% at VIN = 12 V, IOUT = 1 A - reduces thermal load vs. linear regulators in medium-power applications. |
| Standby Current | 85 μA typical at shutdown - extends battery life in always-on systems with controlled power sequencing. |
| Thermal Protection | Internal junction temperature cutoff at 150°C - prevents damage during overload or poor PCB heat sinking. |
Pinout & Package
LM2595S-3.3/NOPB is supplied in the TO-263-5 (KTT) surface-mount package (10.16 mm × 8.42 mm body), optimized for thermal dissipation on PCB copper areas ≥1 in² without heatsink under ≤50°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Switch node | Drives external catch diode and inductor; voltage swings between (VIN − VSAT) and ≈−0.5 V - requires minimal PCB copper area to limit EMI coupling. |
| 2 - +VIN | Power input | Accepts 4.5–40 V DC; requires local low-ESR bypass capacitor to supply pulsed switch current and suppress transients. |
| 3 - Ground | Reference return | Common return for internal circuitry, feedback network, and external components - must connect to low-impedance ground plane. |
| 4 - Feedback | Voltage sense input | Monitors regulated output via internal 1.23-V reference; open for fixed 3.3-V version - no external resistor divider needed. |
| 5 - ON/OFF | Shutdown control | TTL-compatible enable pin; <1.3 V = ON, >1.3 V = OFF - allows system-level power sequencing and low-power sleep modes. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3-V output | Eliminates external feedback resistors - simplifies layout and improves production yield for 3.3-V logic rails. |
| 150-kHz fixed-frequency operation | Enables predictable EMI spectrum and use of low-cost, widely available 68–100-μH power inductors. |
| TTL shutdown capability | Reduces total input current to 85 μA - supports battery-backed real-time clocks and low-power wake-up circuits. |
| Thermal shutdown + current limiting | Two-stage protection: foldback current limit (1.2–2.4 A peak) and 150°C junction cutoff - ensures robustness in transient overloads. |
| Requires only 4 external components | Inductor, catch diode, input capacitor, output capacitor - minimizes BOM count and design validation effort. |
Applications
| Industrial PLC Power Rail | Automotive Body Control Module |
|---|---|
Use Scenario: Providing clean 3.3-V supply to ARM Cortex-M microcontrollers and CAN transceivers in programmable logic controllers operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24-V input to isolated 3.3-V logic rail with ripple <50 mVpp. Use Value: Delivers 1 A at 78% efficiency with no heatsink required - reduces board space and thermal management complexity. | Use Scenario: Generating 3.3-V supply for infotainment MCU and sensor interface ICs in 12-V automotive systems with cold-crank (6-V) and load-dump (40-V) transients. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator maintaining regulation across 6–40 V input range with built-in overvoltage protection. Use Value: ±4% output accuracy and thermal shutdown ensure reliable operation during battery voltage fluctuations and ambient temperatures up to 125°C. |
| Medical Point-of-Care Device | IoT Edge Sensor Node |
Use Scenario: Powering low-noise analog front-ends and wireless SoCs in portable diagnostic equipment powered by Li-ion batteries (8–12.6 V). IC Role / Device Role / Timing Role: Efficient preregulator preceding LDOs to reduce dropout and thermal stress on downstream analog circuits. Use Value: 85 μA standby current extends battery runtime in sleep mode; 150-kHz switching avoids interference with sensitive ADC sampling clocks. | Use Scenario: Supplying 3.3-V rail to ultra-low-power microcontrollers and sub-GHz RF transceivers in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Main DC-DC converter enabling multi-year battery life via high-efficiency conversion and controlled shutdown during idle periods. Use Value: Fixed 3.3-V output eliminates calibration drift from resistor tolerances; TO-263 package supports automated reflow assembly and thermal relief. |
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-3.3/NOPB | TO-220-5 through-hole package; higher RθJA (50°C/W vs. 30°C/W for TO-263 with 2.5 in² copper) | Suitable for prototyping or low-volume assemblies where manual soldering is preferred | Select when mechanical mounting or hand-soldering is required; derate output current above 75°C ambient. |
| LM2596S-3.3 | Higher 150-kHz efficiency (88% vs. 78% at 12 V→3.3 V/1 A); wider VIN range (4.5–45 V); adjustable version only includes FB pin | Better suited for high-efficiency or higher-input-voltage designs where footprint and thermal margin allow | Choose for improved thermal performance or tighter output regulation; verify PCB layout compatibility with different pinout. |
Compared with LM2595S-3.3/NOPB, the TO-220 variant offers easier prototyping but lower thermal efficiency, while LM2596S-3.3 delivers higher efficiency and input voltage margin at the cost of requiring updated layout and potentially higher BOM cost.
Availability
LM2595S-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2595S-3.3/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, embedded processing, and power management technologies.
The LM2595 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for cost-sensitive, medium-power DC-DC applications where ease of design, reliability, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2595S-3.3/NOPB?
The absolute maximum input voltage for LM2595S-3.3/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 thermal shutdown before catastrophic failure. For automotive load-dump conditions, external clamping is advised if input transients exceed 40 V.
Does LM2595S-3.3/NOPB require an external feedback resistor network?
No, LM2595S-3.3/NOPB does not require external feedback resistors because it is the fixed-output 3.3-V version. The feedback pin (Pin 4) is internally connected to the 1.23-V reference and output divider - leaving it unconnected is correct. Adding external resistors would disrupt regulation and is not supported.
Can LM2595S-3.3/NOPB operate without a heatsink in a TO-263 package?
Yes, LM2595S-3.3/NOPB in the TO-263-5 package typically operates without a heatsink at full 1-A load when ambient temperature remains below 50°C and PCB copper area is ≥1 in². Thermal resistance drops to 30°C/W with 2.5 in² of 1-oz copper, enabling safe junction temperatures under most industrial conditions.
What is the shutdown current consumption of LM2595S-3.3/NOPB?
The standby quiescent current of LM2595S-3.3/NOPB is 85 μA typical (up to 250 μA over temperature) when the ON/OFF pin is pulled above 1.3 V. This low current enables extended battery life in sleep-mode applications such as remote sensors and portable instrumentation where the LM2595S-3.3/NOPB powers auxiliary circuitry only during active periods.
Is LM2595S-3.3/NOPB RoHS compliant and lead-free?
Yes, LM2595S-3.3/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix per Texas Instruments' packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for Pb-free reflow soldering profiles up to 260°C peak temperature.
LM2595S-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- 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):
- 3.3V
- 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)
LM2595S-3.3/NOPB FAQ
1.How can I place an order for LM2595S-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595S-3.3/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 LM2595S-3.3/NOPB reliable?
The price and inventory of LM2595S-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595S-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595S-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595S-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595S-3.3/NOPB?
LM2595S-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595S-3.3/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 LM2595S-3.3/NOPB?
For technical support, including LM2595S-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595S-3.3/NOPB requirements.
6.How does Aetrix verify that LM2595S-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595S-3.3/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 LM2595S-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595S-3.3/NOPB?
All LM2595S-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595S-3.3/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 LM2595S-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2595S-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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