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onsemi LM2595TADJG
- Part No.:
- LM2595TADJG
- Manufacturer:
- onsemi
- Package:
- TO-220-5
- Datasheet:
-
LM2595TADJG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,677
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Product details
Overview
LM2595TADJG from onsemi is a monolithic step-down (buck) switching regulator IC capable of delivering 1.0 A output current with adjustable output voltage from 1.23 V to 37 V. It integrates an internal power switch, fixed 150 kHz oscillator, cycle-by-cycle current limit, thermal shutdown, and internal loop compensation. Designed for high-efficiency DC-DC conversion in space-constrained industrial and embedded power supplies.
For engineers reviewing the LM2595TADJG datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (4.5–40 V), guaranteed 1.0 A load capability, 4% output voltage tolerance, 50 µA standby current under TTL shutdown, and D2PAK package thermal performance (RθJC = 5.0 °C/W).
Technical Context
The LM2595TADJG implements a voltage-mode controlled buck topology with internal NPN switch and integrated oscillator. Its feedback pin (Pin 4) senses output voltage via external resistor divider, enabling precise output programming while maintaining internal error amplifier compensation.
Operation includes cycle-by-cycle current limiting at peak 1.15–2.6 A and automatic frequency reduction to ~30 kHz during overload or short-circuit conditions-reducing average power dissipation. Thermal shutdown activates at TJ ≥ 150 °C, and the ON/OFF pin (Pin 5) provides logic-level enable/disable control with 1.6 V threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1.0 A continuous load current-supports single-rail power delivery for microcontrollers, sensors, and analog circuitry without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V-enables direct operation from 5 V, 12 V, 24 V, or unregulated battery/adapter inputs without pre-regulation. |
| Switching Frequency | Fixed 150 kHz (typ.)-permits use of compact 68 µH inductors and standard electrolytic capacitors while avoiding AM radio band interference. |
| Feedback Reference Voltage | 1.23 V ±4%-sets output voltage accuracy and defines minimum programmable output; enables stable 3.3 V, 5 V, or custom rail generation. |
| Standby Quiescent Current | 50 µA (typ.)-ensures ultra-low power consumption during shutdown, critical for battery-backed or energy-sensitive systems. |
| Saturation Voltage | 1.0 V (typ.) at 1.0 A-defines conduction loss across internal switch; directly impacts efficiency at low-VOUT/high-ILOAD operating points. |
| Thermal Resistance (Junction-to-Case) | 5.0 °C/W-enables high-power dissipation when mounted to heatsink; supports >10 W continuous output power with proper PCB copper area. |
Pinout & Package
D2PAK (TO-263) package with exposed thermal pad electrically connected to Pin 3 (GND); heatsink surface must be soldered to large GND copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Emitter of internal NPN switch | Carries pulsed inductor current; requires minimal PCB copper area to reduce EMI coupling into sensitive analog circuits. |
| 2 - Vin | Positive input supply | Accepts 4.5–40 V DC; must be bypassed with low-ESR capacitor placed adjacent to pin to suppress switching transients. |
| 3 - GND | Circuit ground reference | Common return for internal circuitry and thermal pad; serves as single-point grounding node for stability and noise control. |
| 4 - Feedback | Error amplifier input | High-impedance (25–200 nA bias) node sensing resistor divider; must be routed short and away from noisy traces to prevent regulation drift. |
| 5 - ON/OFF | Logic-enable control input | TTL-compatible shutdown pin; ≤1.0 V = ON, ≥2.2 V = OFF; draws <30 µA in shutdown state. |
Key Features
| Feature | Design Value |
|---|---|
| Internal loop compensation | Eliminates need for external compensation network-reduces BOM count and layout sensitivity while ensuring stability across full load/line range. |
| 150 kHz fixed-frequency oscillator | Enables predictable EMI profile and consistent filter design; avoids variable-frequency jitter that complicates EMI filtering. |
| Cycle-by-cycle current limit | Protects internal switch and external components during overloads or shorts without latch-up-supports robust field-reliable operation. |
| Pb-free D2PAK packaging | Meets RoHS compliance requirements; MSL Level 1 rating allows unlimited floor life and standard reflow processing without baking. |
| TTL-compatible ON/OFF control | Permits seamless integration with microcontroller GPIO or system power sequencers-no level-shifting required for 3.3 V or 5 V logic domains. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Generating 5 V/1 A from 12–24 V vehicle battery for MCU, CAN transceiver, and sensor interface. IC Role / Device Role / Timing Role: Primary DC-DC buck regulator providing regulated rail with high efficiency (>81% at 12 V → 5 V/1 A) and wide input tolerance. Use Value: Reduces heat generation vs. linear regulators; eliminates need for external current-sense or compensation components. | Use Scenario: On-board 3.3 V supply for automotive infotainment microprocessor core logic. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 3.3 V using R1=1.0 kΩ, R2=1.7 kΩ divider. Use Value: Maintains regulation across cold-crank (4.5 V) and load-dump (40 V) conditions per ISO 7637-2. |
| Programmable Lab Bench Supply | IoT Edge Sensor Node |
Use Scenario: User-adjustable 1.23–37 V output for prototyping and testing analog/digital circuits. IC Role / Device Role / Timing Role: Core switching regulator with potentiometer-based feedback network enabling continuous output voltage tuning. Use Value: Delivers up to 1.0 A at any setpoint without redesign; internal current limit prevents damage during accidental short. | Use Scenario: Low-quiescent power supply for battery-operated environmental sensor node with periodic wake-up. IC Role / Device Role / Timing Role: Efficient 3.3 V rail generator with ON/OFF pin controlled by MCU to disable supply between measurements. Use Value: Achieves 50 µA shutdown current-extends coin-cell or Li-SOCl₂ battery life by >10× versus always-on regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596TADJG | Higher 3.0 A output current, 150 kHz frequency, wider 4.5–40 V input range, but larger D2PAK-5 footprint and higher quiescent current (10 mA vs. 5 mA active). | Better suited for higher-current loads; less optimal for space-constrained designs where LM2595TADJG's smaller die and proven 1 A capability suffice. | Select LM2596TADJG only if >1.5 A output is required; otherwise LM2595TADJG offers lower cost and simpler thermal layout. |
| MP1584EN-LF-Z | 1.5 A output, 1.5 MHz switching frequency, requires external compensation, no integrated thermal shutdown, but smaller SOIC-8 package. | Enables much smaller LC filters but demands careful loop compensation; lacks fault protection features present in LM2595TADJG. | Choose MP1584EN-LF-Z for ultra-compact designs with design resources for compensation; retain LM2595TADJG for ruggedness, simplicity, and drop-in reliability. |
Compared with LM2596TADJG and MP1584EN-LF-Z, the LM2595TADJG delivers optimal balance of proven 1 A performance, integrated protection, minimal external component count, and D2PAK thermal robustness-making it ideal for cost-sensitive, reliability-critical industrial and automotive auxiliary rails.
Availability
LM2595TADJG is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and IoT sensor nodes requiring stable component supply with long lifecycle support.
Supply support for LM2595TADJG 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 monolithic buck regulators optimized for ease-of-use, high efficiency, and rugged operation in harsh environments-designed specifically for engineers needing reliable, low-component-count DC-DC conversion without complex compensation.
FAQ
What is the maximum input voltage the LM2595TADJG can handle?
The LM2595TADJG has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V continuously risks exceeding thermal limits or triggering overvoltage stress; for transient surges like automotive load dump, external clamping (e.g., TVS diode) is advised. The device maintains regulation and protection functionality within its specified 4.5–40 V window.
How do I calculate the output voltage for the LM2595TADJG?
The LM2595TADJG output voltage is set by an external resistor divider connected to the Feedback (Pin 4) and GND. Use the formula VOUT = 1.23 V × (1 + R2/R1), where R1 connects from Feedback to GND and R2 from Output to Feedback. For example, R1 = 1.0 kΩ and R2 = 3.0 kΩ yields 4.92 V. The LM2595TADJG reference voltage is trimmed to 1.23 V ±4%, ensuring accurate programmability.
Does the LM2595TADJG require external compensation components?
No, the LM2595TADJG features fully internal loop compensation. This eliminates the need for external capacitors or resistors in the feedback path-reducing bill-of-materials count, PCB area, and design iteration time. Stability is guaranteed across the full operating range (4.5–40 V input, 1.23–37 V output, 0–1.0 A load) without user adjustment, as verified in the official onsemi datasheet test circuits.
What thermal considerations apply to the LM2595TADJG in D2PAK package?
The LM2595TADJG in D2PAK has RθJC = 5.0 °C/W and RθJA = 70 °C/W. To maintain TJ < 125 °C, the exposed thermal pad (connected to Pin 3/GND) must be soldered to ≥4 cm² of 2-oz copper with ≥4 thermal vias to inner ground planes. Without adequate copper, power dissipation above ~1.5 W may trigger thermal shutdown. Derating curves in the LM2595TADJG datasheet confirm 1.0 A output is sustainable at ambient ≤60 °C with proper layout.
Can the LM2595TADJG be used in discontinuous conduction mode (DCM)?
Yes, the LM2595TADJG operates naturally in both continuous and discontinuous conduction modes depending on load, input voltage, and inductor value. At light loads (<300 mA), it transitions to DCM-reducing inductor size requirements and eliminating subharmonic oscillation risk. The device's internal current limit and frequency foldback ensure stable regulation and protection in DCM, as validated in Figure 20 and Figure 21 of the LM2595TADJG datasheet.
LM2595TADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2595TADJG FAQ
1.How can I place an order for LM2595TADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595TADJG 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 LM2595TADJG reliable?
The price and inventory of LM2595TADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595TADJG is usually 5 days.
3.What payment methods are accepted for LM2595TADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595TADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595TADJG?
LM2595TADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595TADJG 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 LM2595TADJG?
For technical support, including LM2595TADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595TADJG requirements.
6.How does Aetrix verify that LM2595TADJG is sourced from the original manufacturer or authorized distributors?
All LM2595TADJG 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 LM2595TADJG meets industry standards.
7.What is the process for return or replacement of LM2595TADJG?
All LM2595TADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2595TADJG, 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 LM2595TADJG part is unused and in its original packaging.
Return procedure for LM2595TADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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