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Texas Instruments LM2595SX-ADJ/NOPB
- Part No.:
- LM2595SX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595SX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,499
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Product details
Overview
LM2595SX-ADJ/NOPB from Texas Instruments is a monolithic nonsynchronous step-down DC-DC converter IC designed for 1-A load regulation in buck topologies. It delivers adjustable output voltage from 1.2 V to 37 V (±4% tolerance), operates at 150 kHz fixed frequency, supports input voltages up to 40 V, and integrates thermal shutdown and current-limit protection. It is used in on-card switching regulators requiring high efficiency with minimal external components.
For engineers reviewing the LM2595SX-ADJ/NOPB datasheet, LM2595SX-ADJ/NOPB pinout, LM2595SX-ADJ/NOPB application, or LM2595SX-ADJ/NOPB equivalent, key selection criteria include output adjustability range, 1-A guaranteed load capability, TO-263 package thermal performance, TTL-compatible ON/OFF control, and feedback bias current of 10–50 nA.
Technical Context
The LM2595SX-ADJ/NOPB implements a nonsynchronous buck topology with internal 150-kHz oscillator and integrated power switch. Its feedback loop senses output voltage via an external resistor divider connected to the Feedback pin, referenced to a precise 1.23-V internal bandgap reference (1.18–1.28 V over temperature).
It features TTL-compatible ON/OFF control with 1.3-V threshold, standby quiescent current of 85 μA typical, and self-protection mechanisms including two-stage current limiting and thermal shutdown. The device operates across –40°C to +125°C junction temperature and requires only four external components: input capacitor, output capacitor, catch diode, and inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.2 V to 37 V, set by external resistor divider; ±4% accuracy over line/load/temperature |
| Max Output Current | 1 A DC load, ensured across operating conditions without derating at ambient ≤50°C |
| Input Voltage Range | 4.5 V to 40 V; absolute max rating is 45 V |
| Switching Frequency | 150 kHz fixed (110–173 kHz over temperature); enables compact filter design with standard inductors |
| Feedback Reference | 1.23 V nominal (1.18–1.28 V over temperature); determines output via R1/R2 divider ratio |
| Standby Quiescent Current | 85 μA typical when ON/OFF pin >1.3 V; enables low-power system sleep modes |
| Thermal Resistance θJA | 30°C/W with 2.5 in² 1-oz copper; 20°C/W with double-sided 3 in² copper - guides heatsink-free layout |
Pinout & Package
LM2595SX-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). The package is RoHS-compliant and lead-free (NOPB suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Internal switch drain | Swings between (VIN − VSAT) and ~−0.5 V; PCB copper area must be minimized to reduce EMI coupling |
| 2 - +VIN | Power input | Accepts 4.5–40 V; requires low-ESR bypass capacitor placed adjacent to pin for transient suppression |
| 3 - Ground | Reference node | Common return for internal circuitry and external components; connects to thermal pad for heat dissipation |
| 4 - Feedback | Voltage sense input | High-impedance node (10–50 nA bias); connects to resistor divider midpoint to regulate output |
| 5 - ON/OFF | Logic enable input | TTL-compatible; <1.3 V = ON, >1.3 V = OFF; draws <15 μA when high, <5 μA when low |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.2–37 V range via two-resistor divider; eliminates need for multiple fixed-voltage SKUs |
| Integrated protection | Thermal shutdown + two-stage current limit prevent damage during overload or fault conditions |
| Low standby power | 85 μA typical IQ in shutdown enables battery-backed or energy-sensitive systems |
| Minimal external parts | Only 4 components required: input cap, output cap, catch diode, inductor - reduces BOM cost and layout complexity |
| Stable 150-kHz operation | Fixed-frequency oscillator ensures predictable EMI profile and simplifies EMI filter design |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: On-board 12-V to 3.3-V conversion for microcontroller and sensor rails in programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3 V at up to 1 A with ±4% accuracy. Use Value: Eliminates need for heatsink below 50°C ambient; withstands automotive load-dump transients up to 40 V input. | Use Scenario: Distributed 12-V to 5-V conversion for door module MCU, CAN transceiver, and LED drivers. IC Role / Device Role / Timing Role: Nonsynchronous buck controller managing power sequencing and low-quiescent sleep mode. Use Value: 85 μA shutdown current extends battery life during vehicle off-state; TO-263 package supports automated SMT assembly. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
Use Scenario: Isolated auxiliary supply generation in portable ultrasound units requiring stable 12-V rail from lithium battery pack. IC Role / Device Role / Timing Role: Pre-regulator feeding linear post-regulators for analog front-end circuits. Use Value: High efficiency (>78% at 12-V out) minimizes thermal rise in sealed enclosures; ±4% output tolerance meets medical-grade stability requirements. | Use Scenario: Benchtop multimeter power subsystem converting 24-V adapter input to adjustable 1.2–15-V analog supply. IC Role / Device Role / Timing Role: User-programmable voltage source enabling flexible test voltage configuration. Use Value: Adjustable output range (1.2–37 V) supports diverse DUT voltage requirements; 150-kHz switching avoids interference with sensitive measurement bandwidths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596SX-ADJ/NOPB | Higher 3-A output current, 150-kHz frequency, same pinout and feedback reference (1.23 V) | Better suited for higher-current loads; requires larger inductor and output capacitor | Select when ≥2-A output is needed; otherwise LM2595SX-ADJ/NOPB offers lower cost and smaller solution size |
| MP1584EN-LF-Z | Sync rectification, 3-A output, 1.5-MHz switching, different pinout and feedback voltage (0.8 V) | Enables smaller magnetics and lower output ripple; not pin-compatible | Choose for space-constrained designs needing higher efficiency above 1 A; redesign required due to non-interchangeable pinout and control scheme |
Compared with LM2596SX-ADJ/NOPB, the LM2595SX-ADJ/NOPB provides identical adjustability and control interface at lower current and cost; versus MP1584EN-LF-Z, it trades higher-frequency sync operation for proven robustness, simpler layout, and direct compatibility with legacy LM2595 designs.
Availability
LM2595SX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2595SX-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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM2595 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where reliability, minimal external components, and thermal robustness are critical.
FAQ
What is the minimum input voltage required for stable operation of the LM2595SX-ADJ/NOPB?
The LM2595SX-ADJ/NOPB requires a minimum input voltage of 4.5 V under recommended operating conditions. Below this, regulation cannot be maintained - especially when output voltage is set near the upper end of its 1.2–37 V range. Dropout behavior is governed by the internal switch saturation voltage (VSAT ≈ 1.2 V typical), so VIN must exceed VOUT + VSAT by sufficient margin for continuous conduction.
Can the LM2595SX-ADJ/NOPB be used in a negative-output (inverting) configuration?
Yes, the LM2595SX-ADJ/NOPB supports inverting regulator topologies per TI's Application Note SNVA239. In this configuration, the ground pin is referenced to the negative output, and the feedback pin is tied to system ground. The LM2595SX-ADJ/NOPB regulates the inverted output voltage using its standard 1.23-V reference, enabling designs such as +12 V to –5 V conversion.
What is the maximum allowable feedback resistor divider current for accurate regulation of the LM2595SX-ADJ/NOPB?
The LM2595SX-ADJ/NOPB specifies feedback bias current of 10–50 nA (typical 25 nA) at 25°C. To maintain ±4% output accuracy, total divider current should be ≥100× the bias current - i.e., ≥1 μA. For a 1.23-V reference, this implies maximum top-resistor value of ~36 kΩ when setting VOUT = 12 V (R1 = 36 kΩ, R2 = 4.12 kΩ), ensuring negligible error from current draw.
Does the LM2595SX-ADJ/NOPB require an external compensation network?
No, the LM2595SX-ADJ/NOPB includes internal frequency compensation optimized for standard buck configurations with typical external components. No external compensation components are needed - a key enabler of its "SIMPLE SWITCHER®" designation. Stability is ensured when using recommended inductor values (e.g., 68–100 μH) and low-ESR output capacitors per TI's design guidelines.
How does thermal performance differ between the TO-220 and TO-263 packages for the LM2595SX-ADJ/NOPB?
The LM2595SX-ADJ/NOPB in TO-263 (KTT) achieves θJA = 30°C/W with 2.5 in² copper, while the TO-220 (NDH) reaches 50°C/W under identical conditions. The TO-263's exposed thermal pad enables superior heat transfer to PCB planes, allowing full 1-A operation without heatsink up to 50°C ambient - whereas TO-220 typically requires heatsinking above 35°C ambient for sustained 1-A loads.
LM2595SX-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:
- Tape & Reel (TR)
- 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)
LM2595SX-ADJ/NOPB FAQ
1.How can I place an order for LM2595SX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595SX-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 LM2595SX-ADJ/NOPB reliable?
The price and inventory of LM2595SX-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 LM2595SX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2595SX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595SX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595SX-ADJ/NOPB?
LM2595SX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595SX-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 LM2595SX-ADJ/NOPB?
For technical support, including LM2595SX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595SX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2595SX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2595SX-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 LM2595SX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2595SX-ADJ/NOPB?
All LM2595SX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2595SX-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 LM2595SX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2595SX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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