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Texas Instruments LM2595S-ADJ/NOPB
- Part No.:
- LM2595S-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595S-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:333
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Product details
Overview
LM2595S-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down (buck) DC-DC converter IC designed for 1-A load regulation with fixed 150-kHz switching frequency, 1.2 V to 37 V adjustable output voltage range, ±4% output voltage tolerance over line and load, and input voltage support up to 40 V. It serves as a primary power conversion stage in industrial power supplies, embedded system rails, and battery-powered equipment requiring efficient mid-power regulation.
For engineers reviewing the LM2595S-ADJ/NOPB datasheet, LM2595S-ADJ/NOPB pinout, LM2595S-ADJ/NOPB application, or LM2595S-ADJ/NOPB equivalent, key selection criteria include its TO-263-5 package thermal performance, feedback-based output adjustability, TTL-compatible ON/OFF control, and minimal external component count (4 total) for rapid implementation.
Technical Context
The LM2595S-ADJ/NOPB integrates a 150-kHz fixed-frequency oscillator, internal current-limit protection, thermal shutdown, and a high-side NPN switch with 1.2 V saturation voltage at 1 A. Its feedback loop uses a precision 1.23 V reference with ≤50 nA bias current, enabling stable output programming via two external resistors.
It operates in continuous conduction mode by default but supports discontinuous mode at light loads; switching behavior is governed by duty cycle modulation (0–100%), with oscillator frequency variation limited to ±15% across temperature and supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.2 V to 37 V - Programmable via external resistor divider; enables single BOM for multiple rail voltages. |
| Max Output Current | 1 A - Guaranteed across full operating temperature range (–40°C to +125°C junction). |
| Input Voltage Range | 4.5 V to 40 V - Supports wide-input applications including 12 V/24 V industrial buses and unregulated adapter inputs. |
| Switching Frequency | 150 kHz (±15%) - Enables use of low-cost, standard inductors and reduces EMI filtering complexity vs. higher-frequency converters. |
| Feedback Reference | 1.23 V ±2% - High-accuracy reference with ≤100 nA bias current ensures tight output regulation under varying load conditions. |
| Standby Quiescent Current | 85 μA typical - Enables ultra-low-power shutdown state for battery-backed or energy-sensitive systems. |
| Thermal Shutdown Threshold | 150°C junction - Self-protecting operation prevents damage during overload or poor heatsinking scenarios. |
Pinout & Package
LM2595S-ADJ/NOPB is supplied in a 5-pin TO-263 (KTT) surface-mount package with exposed thermal pad (10.16 mm × 8.42 mm body size), optimized for PCB heat dissipation without mandatory heatsink below 50°C ambient and <12 V output.
| 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 copper area to reduce 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 path for internal circuitry, feedback network, and external components; must be low-impedance connection. |
| 4 - Feedback | Regulation sense | Monitors output via resistor divider; internal 1.23 V reference compares against this node to adjust duty cycle. |
| 5 - ON/OFF | Logic enable | TTL-compatible shutdown control; <1.3 V = ON, >1.3 V = OFF; draws ≤200 μA in shutdown; can be tied to GND for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.2 V to 37 V range with ±4% accuracy - Eliminates need for multiple fixed-output SKUs and simplifies inventory management. |
| Integrated thermal & current protection | Two-stage current limit + 150°C junction shutdown - Prevents catastrophic failure during short-circuit or overload without external sensing circuitry. |
| Low-component-count design | Only 4 external parts required (inductor, diode, input/output caps) - Reduces BOM cost, layout area, and qualification effort. |
| Fixed 150-kHz oscillator | No external timing components needed - Ensures predictable EMI profile and simplifies filter design versus variable-frequency alternatives. |
| TTL-compatible shutdown | 85 μA standby current with logic-level control - Enables microcontroller-driven power sequencing and system-level energy management. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
|
Use Scenario: Converting 24 V factory bus to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC rails with high efficiency and robust line/load regulation. Use Value: Delivers 1 A at >82% efficiency (VIN = 12 V), withstands 40 V transients, and maintains ±4% output accuracy across –40°C to +85°C ambient. |
Use Scenario: Generating 3.3 V for ARM Cortex-M microcontrollers and peripherals in portable test equipment. IC Role / Device Role / Timing Role: Step-down converter with programmable output and logic-controlled shutdown for dynamic power management. Use Value: Enables deep-sleep modes via 85 μA standby current; adjustable feedback allows precise 3.3 V tuning despite component tolerances. |
| Battery-Powered Instrumentation | Positive-to-Negative Converter |
|
Use Scenario: Regulating 9–18 V Li-ion pack voltage to stable 5 V for analog front-end and data acquisition circuits. IC Role / Device Role / Timing Role: Mid-power buck regulator handling wide input variation while maintaining low-noise output for precision ADCs. Use Value: 150-kHz switching enables compact LC filtering; ±4% output tolerance ensures consistent reference voltage for 16-bit ADC performance. |
Use Scenario: Generating –5 V from +12 V supply for op-amp biasing and signal conditioning in mixed-signal systems. IC Role / Device Role / Timing Role: Inverting buck-boost topology using LM2595S-ADJ/NOPB's ground-referenced feedback and switch node. Use Value: Leverages same IC for dual-polarity rails; supports up to 1 A inverted output when VIN + |VOUT| ≤ 40 V (e.g., 20 V → –12 V). |
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-ADJ/NOPB | Higher 150-kHz oscillator accuracy (±10%), lower 0.5-V dropout, integrated soft-start; same pinout and package. | Preferred for noise-sensitive analog rails due to improved ripple rejection and reduced startup overshoot. | Drop-in replacement with enhanced stability; verify inductor saturation current rating matches new peak switch current. |
| MP1584EN-LF-Z | Higher 1.5-MHz switching frequency, smaller external components, but only 3-A max output; SOIC-8 package. | Suitable for space-constrained designs where board area is critical and 3-A capability is unused. | Not pin-compatible; requires PCB redesign; offers better light-load efficiency but less rugged overvoltage tolerance (28 V max VIN). |
Compared with LM2595S-ADJ/NOPB, LM2596S-ADJ/NOPB provides tighter regulation and smoother startup in identical layouts, while MP1584EN-LF-Z trades ruggedness and simplicity for miniaturization and higher frequency-making it viable only where footprint reduction outweighs transient resilience needs.
Availability
LM2595S-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, and battery-powered instrumentation requiring stable component supply, long-term lifecycle continuity, and traceable sourcing.
Supply support for LM2595S-ADJ/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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2595S-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust operation in industrial and commercial power applications without requiring complex compensation networks.
FAQ
What is the minimum input voltage required for LM2595S-ADJ/NOPB to regulate a 3.3 V output?
The LM2595S-ADJ/NOPB requires a minimum input voltage of approximately 4.5 V to maintain regulation at 3.3 V output, per its recommended operating conditions. This accounts for the internal switch saturation voltage (~1.2 V) and feedback headroom. Below 4.5 V, the device enters dropout and output voltage drops linearly with input.
Can LM2595S-ADJ/NOPB be used in an inverting (positive-to-negative) configuration?
Yes, LM2595S-ADJ/NOPB supports inverting configurations per TI's Application Note SNVA239. It uses the switch node and ground pin repositioning to generate negative outputs such as –5 V from +12 V, provided VIN + |VOUT| ≤ 40 V. The feedback pin remains referenced to system ground, enabling stable regulation.
What is the maximum allowable feedback resistor value for LM2595S-ADJ/NOPB?
The maximum recommended feedback resistor value is 100 kΩ for the upper resistor (R1) to minimize error from 50 nA feedback bias current. Using higher values increases output voltage error; TI's design procedure specifies R1 ≤ 100 kΩ and R2 ≥ 1.2 kΩ to keep bias-induced error below 0.1%.
Does LM2595S-ADJ/NOPB require an external compensation network?
No, LM2595S-ADJ/NOPB includes internal frequency compensation and is stable with standard external components (inductor, diode, input/output capacitors). No external compensation components are needed-this is a key feature of the SIMPLE SWITCHER® architecture that simplifies design and reduces risk of instability.
What thermal derating applies to LM2595S-ADJ/NOPB in TO-263 package without a heatsink?
In TO-263 (KTT) package on a 1-in² 1-oz copper PCB, LM2595S-ADJ/NOPB has RθJA = 50°C/W. At 25°C ambient, maximum continuous output current drops to ~0.75 A before reaching 125°C junction limit. Derating is linear: for every 10°C ambient rise above 25°C, max load current decreases by ~100 mA.
LM2595S-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM2595S-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595S-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM2595S-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595S-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595S-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595S-ADJ/NOPB?
LM2595S-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595S-ADJ/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-ADJ/NOPB?
For technical support, including LM2595S-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595S-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2595S-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595S-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595S-ADJ/NOPB?
All LM2595S-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595S-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2595S-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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