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Texas Instruments LM2595S-12/NOPB
- Part No.:
- LM2595S-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595S-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:474
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Product details
Overview
LM2595S-12/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down (buck) DC-DC converter delivering 1-A output current with fixed 12-V output, ±4% output voltage tolerance over line and load, 4.5–40-V input range, and thermal/current-limit protection. It serves as an efficient on-card switching regulator in industrial power supplies and embedded systems requiring stable mid-power conversion.
For engineers reviewing the LM2595S-12/NOPB datasheet, LM2595S-12/NOPB pinout, LM2595S-12/NOPB application, or LM2595S-12/NOPB equivalent, key selection criteria include its fixed 12-V output, TO-263-5 package thermal performance, TTL-compatible ON/OFF control, 85-μA standby current, and compatibility with standard off-the-shelf inductors.
Technical Context
The LM2595S-12/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single chip, operating at a fixed 150-kHz switching frequency to minimize external filter size. Its feedback loop senses output voltage via an internal 1.23-V reference and adjusts duty cycle to maintain regulation.
It features TTL-compatible shutdown (ON/OFF pin threshold ≈1.3 V), two-stage current limiting for overload protection, and thermal shutdown at 150°C junction temperature. The device operates in continuous conduction mode under typical 1-A loads but supports discontinuous mode at lighter loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over full line/load/temperature range - ensures stable rail for logic, analog, or interface ICs without external resistor network. |
| Max Output Current | 1 A DC - supports mid-power subsystems such as microcontroller cores, sensors, or communication modules. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial, automotive, or battery-derived supplies without pre-regulation. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost 10–100 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Standby Quiescent Current | 85 μA typical - minimizes system power draw during sleep or shutdown modes in battery-backed applications. |
| Saturation Voltage | 1.2 V max at 1 A - limits conduction loss in internal switch, supporting >90% efficiency at VIN = 25 V, IOUT = 1 A. |
| Thermal Shutdown | 150°C junction - provides fail-safe protection during overload or poor heatsinking conditions. |
Pinout & Package
LM2595S-12/NOPB is housed in a TO-263-5 (KTT) surface-mount package measuring 10.16 mm × 8.42 mm with exposed thermal pad for enhanced heat dissipation. No heatsink required below 50°C ambient at ≤1 A load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal switch drain | Swings between (VIN − VSAT) and ≈−0.5 V; requires minimal PCB copper area to reduce EMI coupling into sensitive circuits. |
| 2 - +VIN | Power input | Accepts 4.5–40 V; must be bypassed with low-ESR capacitor near pin to supply high di/dt switching current and suppress transients. |
| 3 - Ground | Reference node | Common return for internal circuitry, feedback, and ON/OFF control; must connect to low-impedance ground plane. |
| 4 - Feedback | Voltage sense input | Internally referenced to 1.23 V; unused in fixed-output versions but tied internally to set 12-V regulation point. |
| 5 - ON/OFF | Logic shutdown control | TTL-compatible: <1.3 V = ON, >1.3 V = OFF; draws <200 μA in shutdown, enabling low-power system-level control. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 12-V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity while guaranteeing ±4% accuracy across temperature and load. |
| 150-kHz fixed oscillator | Enables predictable EMI profile and simplifies EMI filter design using standardized, widely available inductors (e.g., 68–100 μH). |
| TTL shutdown capability | Allows direct interfacing with microcontrollers or logic gates for system-level power sequencing without level-shifting circuitry. |
| Integrated thermal/current protection | Prevents catastrophic failure during short-circuit, overtemperature, or sustained overload-no external sensing components needed. |
| Only 4 external components required | Reduces design time and board space: input cap, output cap, catch diode, and inductor-ideal for cost-sensitive, high-volume applications. |
Applications
| Industrial Power Supply | Embedded Microcontroller Board |
|---|---|
Use Scenario: Converting 24-V DC factory bus to stable 12-V rail for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 12-V supply with high efficiency and robust fault handling. Use Value: Delivers 1-A continuous current at >90% efficiency (VIN = 25 V), eliminating need for linear preregulators and reducing thermal load on enclosure. | Use Scenario: On-board power for ARM Cortex-M7-based edge gateway with Ethernet PHY and RS-485 transceivers. IC Role / Device Role / Timing Role: Mid-power DC-DC stage stepping down 36-V PoE++ input to 12-V intermediate rail. Use Value: Fixed 12-V output simplifies layout and validation; 150-kHz switching allows compact 2-layer PCB design with standard inductor footprints. |
| Automotive Body Control Module | Test & Measurement Equipment |
Use Scenario: Powering 12-V solenoid drivers and CAN transceivers in 12-V vehicle electrical system with cold-crank tolerance. IC Role / Device Role / Timing Role: Buck converter tolerant to 40-V transients and capable of operation down to 4.5-V input during cranking. Use Value: Wide 4.5–40-V input range supports ISO 7637-2 pulse immunity; thermal shutdown prevents latch-up during sustained overloads. | Use Scenario: Generating clean 12-V bias for precision op-amps and ADC references in portable DMMs and signal analyzers. IC Role / Device Role / Timing Role: Low-noise, well-regulated 12-V source with tight ±4% output tolerance and excellent line regulation. Use Value: Internal compensation and fixed frequency ensure stable operation without tuning; 85-μA standby enables long battery life in handheld units. |
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-12/NOPB | Higher 3-A output rating, 150-kHz frequency, same pinout and package - but larger dropout voltage and higher quiescent current (5 mA vs. 85 μA). | Better suited for higher-current loads (>1.5 A); less optimal for low-power standby or tight thermal envelopes. | Select LM2596S-12/NOPB only when >1-A output is required; LM2595S-12/NOPB remains preferred for 1-A, low-IQ, or cost-sensitive designs. |
| MP1584EN-LF-Z | 3-A synchronous buck, 1.5-MHz switching, smaller SOIC-8 package - lacks integrated thermal shutdown and has different pin assignment. | Enables ultra-compact designs with higher efficiency at light loads; requires redesign of layout, feedback network, and external MOSFET drivers. | Choose MP1584EN-LF-Z for space-constrained, high-efficiency applications where synchronous rectification and 1.5-MHz operation justify layout changes and added complexity. |
Compared with LM2596S-12/NOPB, LM2595S-12/NOPB offers lower quiescent current and tighter thermal management in TO-263; versus MP1584EN-LF-Z, it provides drop-in simplicity and built-in protection without external FETs or compensation tuning - ideal for proven, production-ready 1-A buck designs.
Availability
LM2595S-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded microcontroller boards, and automotive body control modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM2595S-12/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 ease-of-use, minimal external component count, and robust operation in industrial, automotive, and consumer power applications - targeting engineers who prioritize reliability and rapid design completion over ultra-high efficiency or ultra-small footprint.
FAQ
What is the maximum input voltage rating for LM2595S-12/NOPB?
The absolute maximum input voltage for LM2595S-12/NOPB is 45 V, but the recommended operating range is 4.5 V to 40 V. Operation above 40 V risks exceeding safe power dissipation limits and may trigger thermal shutdown; sustained use beyond 40 V voids warranty and compromises long-term reliability. Always verify transient conditions (e.g., load dump in automotive) against the 45-V absolute max rating.
Does LM2595S-12/NOPB require an external feedback resistor network?
No, LM2595S-12/NOPB does not require an external feedback resistor network. As a fixed-output variant, its 12-V regulation is implemented internally using a precision 1.23-V reference and trimmed feedback divider. Pin 4 (Feedback) is internally connected and must not be externally modified - doing so invalidates output accuracy and may cause instability.
Can LM2595S-12/NOPB be used in a negative-output (inverting) configuration?
Yes, LM2595S-12/NOPB can be configured as a negative-output inverting regulator by reassigning the ground and feedback connections per TI Application Note SLVA001. In this topology, it generates −12 V from a positive input, but maximum output current depends on VIN–|VOUT| and thermal limits. Startup current surges up to 1.5 A occur, requiring careful input capacitance and delayed start-up design.
What is the thermal resistance (RθJA) of LM2595S-12/NOPB in its TO-263 package?
In the TO-263-5 (KTT) package, LM2595S-12/NOPB has a junction-to-ambient thermal resistance (RθJA) of 50°C/W on a 1-in² PCB with 1-oz copper, dropping to 20°C/W with 3-in² double-sided copper. These values assume proper thermal pad soldering; insufficient pad area or poor solder coverage increases RθJA significantly and may trigger thermal shutdown under 1-A load.
Is LM2595S-12/NOPB RoHS-compliant and lead-free?
Yes, LM2595S-12/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 (MSL) 3 and is qualified for lead-free reflow soldering profiles up to 260°C peak temperature, with no post-reflow annealing required.
LM2595S-12/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):
- 12V
- 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-12/NOPB FAQ
1.How can I place an order for LM2595S-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595S-12/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-12/NOPB reliable?
The price and inventory of LM2595S-12/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-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595S-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595S-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595S-12/NOPB?
LM2595S-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595S-12/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-12/NOPB?
For technical support, including LM2595S-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595S-12/NOPB requirements.
6.How does Aetrix verify that LM2595S-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595S-12/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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595S-12/NOPB?
All LM2595S-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595S-12/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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2595S-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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