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onsemi LM2595TVADJG
- Part No.:
- LM2595TVADJG
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2595TVADJG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,814
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Product details
Overview
LM2595TVADJG 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, self-compensated regulation.
For engineers reviewing the LM2595TVADJG datasheet, pinout, applications, or equivalent options, key selection considerations include its D2PAK package thermal performance, feedback-pin bias current (25–200 nA), 4% output voltage tolerance, 1.0 V typical saturation voltage at 1.0 A, and TTL-compatible ON/OFF control with 1.6 V threshold.
Technical Context
The LM2595TVADJG implements a voltage-mode controlled buck topology with an internal NPN switch, fixed 150 kHz oscillator, and internal loop compensation-eliminating external compensation components. Its feedback architecture uses a precision 1.23 V reference and accepts resistor-divider programming for output voltages up to 37 V.
Protection logic includes cycle-by-cycle current limiting (1.15–2.6 A peak), thermal shutdown at 150 °C junction temperature, and low-power standby mode (50 µA typical). The ON/OFF pin enables logic-level shutdown with 1.6 V threshold and sub-5 µA leakage in active state.
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 - compatible with 5 V, 12 V, 24 V, and 36 V industrial bus rails. |
| Switching Frequency | 150 kHz (±15%) - enables use of standard, cost-effective 68 µH inductors and reduces EMI filtering burden vs. lower-frequency alternatives. |
| Feedback Reference | 1.23 V ±4% - sets output voltage via external R1/R2 divider; enables precise programmability from 1.23 V to 37 V. |
| Saturation Voltage | 1.0 V typical at 1.0 A - directly impacts conduction loss and minimum dropout; limits usable input-output differential. |
| Standby Current | 50 µA typical at 5 V ON/OFF pin - enables ultra-low quiescent power during system sleep modes. |
| Thermal Resistance | RθJC = 5.0 °C/W - requires heatsink attachment to exposed tab (Pin 3) for sustained 1 A operation above ambient ~60 °C. |
Pinout & Package
D2PAK (TO-263) package with exposed thermal pad connected internally to Pin 3 (GND); heatsink surface must be soldered to PCB copper area for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Output) | Emitter of internal NPN switch | Carries high di/dt switching current; PCB trace must be short and wide to minimize parasitic inductance and EMI. |
| 2 (Vin) | Positive input supply | Requires low-ESR input capacitor (e.g., 220 µF/50 V) placed within 5 mm to suppress transients and supply peak switch current. |
| 3 (GND) | Circuit ground reference | Connected to exposed heatsink tab; serves as primary return path for switch, feedback, and ON/OFF signals - must be single-point grounded. |
| 4 (Feedback) | Inverting input of error amplifier | High-impedance node (25–200 nA bias); sensitive to noise - resistors R1/R2 must be placed adjacent to IC with shielded routing. |
| 5 (ON/OFF) | Logic-enable control input | TTL-compatible shutdown: <1.6 V = ON, >2.2 V = OFF; draws <30 µA in OFF state - suitable for microcontroller GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Internal loop compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity in buck designs. |
| Adjustable output (1.23–37 V) | Single IC supports wide output range via two-resistor divider - avoids stocking multiple fixed-output variants. |
| Thermal shutdown + current limit | Self-protecting under overload, short-circuit, or inadequate heatsinking - prevents catastrophic failure without external circuitry. |
| TTL shutdown capability | Enables system-level power sequencing and low-power sleep states using standard logic-level signals. |
| Moisture Sensitivity Level 1 | Zero bake requirement before reflow - simplifies manufacturing and eliminates moisture-related popcorning risk. |
Applications
| Industrial Power Supply | Battery Charger Front-End |
|---|---|
Use Scenario: 24 V input converted 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 rail to microcontrollers and analog front-ends. Use Value: High efficiency (>81% at 12 V→5 V/1 A) reduces heat dissipation in enclosed enclosures; 40 V max input accommodates 24 V bus transients. | Use Scenario: 36 V lead-acid or LiFePO₄ battery charger pre-regulator stepping down to 12 V for linear post-regulation. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing dropout and thermal stress on downstream linear regulators. Use Value: 150 kHz switching allows small 68 µH inductor; adjustable output enables precise charge-voltage setting across battery chemistries. |
| On-Card DC-DC Conversion | Positive-to-Negative Converter |
Use Scenario: Local 3.3 V rail generation on a dense FPGA carrier board powered from 12 V backplane. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing multi-component discrete solutions. Use Value: D2PAK package with integrated thermal pad enables 1 A delivery in <1 cm² footprint; internal compensation saves PCB space. | Use Scenario: Generating −5 V from +12 V for op-amp biasing or RS-232 interface circuits. IC Role / Device Role / Timing Role: Configured as inverting buck-boost converter using standard external components. Use Value: Same IC and layout reused for inverted outputs - no redesign needed; 1.23 V reference ensures stable negative rail accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-ADJ | Higher 3.0 A output current, 150 kHz frequency, but larger D2PAK-5 package and higher quiescent current (10 mA vs. 50 µA). | Preferred where higher output current or tighter line regulation is required; less suitable for low-quiescent battery-powered systems. | Select LM2596-ADJ only when >1.0 A load or improved transient response is mandatory. |
| MP1584EN-LF-Z | 3 A output, 1.5 MHz switching, smaller SOIC-8 package, but requires external compensation and lacks integrated thermal shutdown latch. | Better suited for space-constrained, high-density layouts; demands careful loop stability design and external fault protection. | Choose MP1584EN-LF-Z when board area is critical and design team has SMPS stability expertise. |
Compared with LM2595TVADJG, LM2596-ADJ delivers higher current but sacrifices standby efficiency, while MP1584EN-LF-Z offers miniaturization and speed at the cost of design complexity and reduced built-in protection - making LM2595TVADJG optimal for robust, medium-power, ease-of-use applications.
Availability
LM2595TVADJG is available at Aetrix Electronics and suitable for industrial power supplies, battery charger front-ends, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for LM2595TVADJG 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 manufacturer specializing in energy-efficient power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2595 series was designed as a rugged, easy-to-use buck regulator family targeting cost-sensitive industrial and embedded applications where reliability, thermal robustness, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for the LM2595TVADJG?
The LM2595TVADJG 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 transient suppression (e.g., TVS diode) and verify derating per thermal conditions - the device's 70 °C/W junction-to-ambient resistance requires heatsinking above ~60 °C ambient at full load.
How do I calculate the output voltage for the LM2595TVADJG?
The LM2595TVADJG output voltage is set by a resistor divider on the Feedback pin: VOUT = 1.23 V × (1 + R2/R1). R1 should be 1.0 kΩ to 5.0 kΩ (1% metal film recommended); for example, R1 = 1.0 kΩ and R2 = 3.0 kΩ yields 5.0 V. The 1.23 V reference has ±4% tolerance, so final output accuracy depends on resistor tolerance and temperature drift - use 0.1% resistors for <1% total error.
Does the LM2595TVADJG require an external compensation network?
No, the LM2595TVADJG features internal loop compensation - no external capacitors or resistors are needed for stability. This simplifies design and improves immunity to layout variations. However, proper PCB layout remains critical: keep feedback traces short and away from noisy nodes, place input/output capacitors close to pins, and connect the exposed thermal pad (Pin 3) solidly to GND plane to maintain thermal and electrical integrity.
What is the purpose of the ON/OFF pin on the LM2595TVADJG?
Pin 5 (ON/OFF) enables logic-level shutdown of the LM2595TVADJG: applying <1.6 V (or leaving open) keeps the regulator active; applying >2.2 V shuts it down, reducing total input current to ~50 µA. This pin is TTL-compatible and draws <30 µA in OFF state - ideal for microcontroller GPIO control, system power sequencing, or battery-saving sleep modes without external level-shifting.
Can the LM2595TVADJG be used in a negative-output configuration?
Yes, the LM2595TVADJG can be configured as a positive-to-negative buck-boost converter by grounding the Output pin and taking the regulated output from the Feedback and GND nodes - per Figure 22 in the official datasheet. This requires reversing input/output capacitor polarity and selecting appropriate diode/inductor ratings. Output voltage magnitude remains adjustable via R1/R2, but regulation accuracy and ripple may differ from standard buck mode due to altered loop dynamics.
LM2595TVADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- 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
LM2595TVADJG FAQ
1.How can I place an order for LM2595TVADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595TVADJG 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 LM2595TVADJG reliable?
The price and inventory of LM2595TVADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595TVADJG is usually 5 days.
3.What payment methods are accepted for LM2595TVADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595TVADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595TVADJG?
LM2595TVADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595TVADJG 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 LM2595TVADJG?
For technical support, including LM2595TVADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595TVADJG requirements.
6.How does Aetrix verify that LM2595TVADJG is sourced from the original manufacturer or authorized distributors?
All LM2595TVADJG 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 LM2595TVADJG meets industry standards.
7.What is the process for return or replacement of LM2595TVADJG?
All LM2595TVADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2595TVADJG, 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 LM2595TVADJG part is unused and in its original packaging.
Return procedure for LM2595TVADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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