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onsemi LM2595DSADJR4G
- Part No.:
- LM2595DSADJR4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595DSADJR4G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,539
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Product details
Overview
LM2595DSADJR4G from onsemi is a monolithic step-down switching regulator (buck converter) with 1.0 A output current capability, 150 kHz fixed-frequency internal oscillator, adjustable output voltage range of 1.23 V to 37 V, and integrated thermal shutdown and cycle-by-cycle current limiting. It is used in high-efficiency DC-DC conversion for industrial power supplies and embedded systems requiring compact, low-component-count regulation.
For engineers reviewing the LM2595DSADJR4G datasheet, pinout, applications, or equivalent options, key selection considerations include its 40 V max input voltage, 1.23 V feedback reference, TTL-compatible ON/OFF control, 50 µA standby current, and D2PAK package thermal performance (RθJC = 5.0 °C/W).
Technical Context
The LM2595DSADJR4G implements a voltage-mode controlled buck topology with internal compensation, eliminating external loop compensation components. Its 150 kHz fixed-frequency oscillator enables predictable EMI filtering and consistent inductor sizing across designs.
It features a single NPN bipolar output switch with 1.0–1.3 V saturation voltage at 1.0 A, cycle-by-cycle current limit set at 1.15–2.6 A, and thermal shutdown activation at TJ ≥ 150 °C. The feedback pin accepts 25–200 nA bias current and references a 1.23 V nominal threshold with ±4% tolerance over temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1.0 A continuous load current - supports mid-power applications without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - accommodates wide-input industrial rails, battery packs, and unregulated adapters. |
| Switching Frequency | 135–180 kHz (typ. 150 kHz) - enables use of standard off-the-shelf 68 µH inductors and reduces filter size vs. lower-frequency regulators. |
| Feedback Reference | 1.23 V ±4% - sets output via resistor divider; enables precise programmable outputs from 1.23 V to 37 V. |
| Standby Current | 50 µA typical - allows low-power shutdown mode suitable for battery-backed or energy-sensitive systems. |
| Thermal Resistance | RθJC = 5.0 °C/W - enables high power dissipation through heatsink-connected tab (Pin 3), critical for sustained 1 A operation. |
| Protection Features | Thermal shutdown + cycle-by-cycle current limit - prevents damage during overload, short-circuit, or ambient overheating without external circuitry. |
Pinout & Package
D2PAK (TO-263) package with exposed heatsink surface electrically connected to Pin 3 (GND). Heatsink tab must be soldered to PCB copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Output) | Emitter of internal NPN switch | Carries full switched inductor current; PCB trace must minimize area to reduce EMI coupling. |
| 2 (Vin) | Positive input supply | Requires low-ESR input capacitor placed adjacent to pin; handles up to 45 V absolute max. |
| 3 (GND) | Circuit ground reference | Common return for control logic, feedback, and heatsink tab - must be low-impedance single-point connection. |
| 4 (Feedback) | Error amplifier input | Senses output via resistor divider; 25–200 nA bias current requires high-precision resistors for stable regulation. |
| 5 (ON/OFF) | Logic-level enable/disable | TTL-compatible: <1.0 V = ON, >2.2 V = OFF; draws ≤30 µA when disabled. |
Key Features
| Feature | Design Value |
|---|---|
| Internal loop compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity. |
| Adjustable output (1.23–37 V) | Single-resistor-divider programming enables flexible output configuration without changing IC variant. |
| TTL shutdown interface | Direct microcontroller GPIO control without level-shifting - simplifies system power sequencing. |
| Moisture Sensitivity Level 1 | Unlimited floor life at ≤30 °C/60% RH - no baking required before reflow assembly. |
| Pb-free D2PAK packaging | RoHS-compliant lead finish with 260 °C reflow tolerance - meets industrial and automotive assembly standards. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
Use Scenario: Converting 24 V factory bus to 5 V/1 A for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5 V rail with line/load regulation <±1.5%. Use Value: Replaces linear regulators to achieve >80% efficiency at full load, reducing thermal design burden and enabling compact enclosure integration. | Use Scenario: Generating 3.3 V intermediate rail from 12 V main supply in ARM-based edge gateway. IC Role / Device Role / Timing Role: Efficient pre-regulator feeding low-noise LDOs for digital core and analog peripherals. Use Value: Low 50 µA standby current preserves battery backup runtime; 150 kHz frequency avoids sensitive RF bands in wireless subsystems. |
| Battery Charger Front-end | On-Card Buck Converter |
Use Scenario: Regulating variable solar panel or USB PD input (up to 40 V) to constant 14.4 V for Li-ion charging circuitry. IC Role / Device Role / Timing Role: High-input-voltage buck stage providing stable charge voltage with overtemperature protection. Use Value: Integrated thermal shutdown prevents cell damage during charger fault conditions; 40 V input rating eliminates need for external transient clamping. | Use Scenario: Local 5 V generation on motor drive PCB where space constraints prohibit external DC-DC modules. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator mounted directly on target board near load. Use Value: D2PAK package allows direct heatsinking to PCB plane - achieves 1 A output without discrete heatsink or airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ/NOPB | Higher 3.0 A output current, 150 kHz frequency, but larger TO-220-5 package and higher quiescent current (10 mA vs. 10 mA active / 50 µA standby). | Preferred for higher-current loads (>1.5 A); less suitable for space-constrained or ultra-low-quiescent designs. | Select LM2596S-ADJ/NOPB only when >1.0 A output or higher thermal margin is required; verify PCB footprint compatibility. |
| MP1584EN-LF-Z | 1.5 A output, 1.5 MHz switching frequency, smaller SOIC-8 package, but requires external compensation and lacks integrated thermal shutdown latch. | Better suited for compact, high-density layouts; demands more careful loop stability design and external fault management. | Choose MP1584EN-LF-Z for miniaturized consumer electronics; avoid in safety-critical or thermally isolated environments without added monitoring. |
Compared with LM2596S-ADJ/NOPB and MP1584EN-LF-Z, the LM2595DSADJR4G offers optimal balance of 1 A capability, D2PAK thermal performance, internal compensation, and ultra-low standby current - making it ideal for cost-sensitive industrial and embedded buck applications where simplicity and reliability are prioritized over maximum current or miniaturization.
Availability
LM2595DSADJR4G is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and battery charger front-ends requiring stable component supply and long-term manufacturability.
Supply support for LM2595DSADJR4G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2595 product line delivers robust, easy-to-use buck regulators targeting cost-sensitive, medium-power applications where high efficiency, thermal resilience, and minimal external component count are essential.
FAQ
What is the maximum input voltage rating for the LM2595DSADJR4G?
The LM2595DSADJR4G has an absolute maximum input voltage rating of 45 V, with guaranteed operation across 4.5 V to 40 V. Exceeding 45 V risks permanent damage. For reliable 40 V operation, ensure input transients remain below 45 V using appropriate clamping or filtering - the device does not include integrated overvoltage protection beyond this absolute rating.
How is the output voltage programmed on the LM2595DSADJR4G?
The LM2595DSADJR4G uses a resistor divider from output to feedback (Pin 4) to set output voltage per VOUT = 1.23 V × (1 + R2/R1). R1 is typically 1.0 kΩ to 5.0 kΩ; for 5.0 V output, R1 = 1.0 kΩ and R2 = 3.0 kΩ yields nominal regulation. Feedback bias current (25–200 nA) must be accounted for in precision designs.
Does the LM2595DSADJR4G require external compensation components?
No, the LM2595DSADJR4G features fully internal loop compensation. No external capacitors or resistors are needed for stability - only the output voltage-setting resistor divider, input/output capacitors, inductor, and catch diode are required for basic operation, significantly simplifying design and layout.
What thermal performance can be expected from the LM2595DSADJR4G in a typical PCB layout?
With the D2PAK heatsink tab (Pin 3) soldered to ≥4 cm² of 2-oz copper, the LM2595DSADJR4G achieves RθJA ≈ 40 °C/W. At 1 A output with 12 V input → 5 V, dissipation is ~7 W; junction temperature rise would be ~280 °C above ambient - thus forced air or larger copper is required. Derating to 0.7 A continuous is recommended for still-air operation without heatsink.
Can the LM2595DSADJR4G be used in negative-output (buck-boost) configurations?
Yes - the LM2595DSADJR4G datasheet explicitly lists "Positive to Negative Converter (Buck-Boost)" as an application. In this topology, the IC regulates the magnitude of a negative output by referencing feedback to the negative rail. Careful attention to grounding, diode orientation, and inductor saturation limits is required per Figure 1 application note.
LM2595DSADJR4G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- 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:
- D2PAK-5
LM2595DSADJR4G FAQ
1.How can I place an order for LM2595DSADJR4G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595DSADJR4G 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 LM2595DSADJR4G reliable?
The price and inventory of LM2595DSADJR4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595DSADJR4G is usually 5 days.
3.What payment methods are accepted for LM2595DSADJR4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595DSADJR4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595DSADJR4G?
LM2595DSADJR4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595DSADJR4G 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 LM2595DSADJR4G?
For technical support, including LM2595DSADJR4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595DSADJR4G requirements.
6.How does Aetrix verify that LM2595DSADJR4G is sourced from the original manufacturer or authorized distributors?
All LM2595DSADJR4G 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 LM2595DSADJR4G meets industry standards.
7.What is the process for return or replacement of LM2595DSADJR4G?
All LM2595DSADJR4G units undergo pre-shipment inspection (PSI). If there is an issue with LM2595DSADJR4G, 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 LM2595DSADJR4G part is unused and in its original packaging.
Return procedure for LM2595DSADJR4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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