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onsemi LM2596TVADJG
- Part No.:
- LM2596TVADJG
- Manufacturer:
- onsemi
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2596TVADJG.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:528
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Product details
Overview
LM2596TVADJG from onsemi is a monolithic 3.0 A step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), 150 kHz fixed-frequency internal oscillator, and integrated 3.0 A power switch. It operates from 4.5 V to 40 V input, delivers ±4% output voltage tolerance, and features thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - used in industrial DC-DC conversion, battery charger pre-regulation, and embedded power subsystems.
For engineers reviewing the LM2596TVADJG datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-220-5 (Case 314B) package with heatsink-connected Pin 3, guaranteed 3.0 A load capability at 125°C junction temperature, 80 µA standby current in shutdown, and internal loop compensation eliminating external compensation components.
Technical Context
The LM2596TVADJG implements a voltage-mode controlled buck topology with a 150 kHz fixed-frequency oscillator and internal 1.235 V bandgap reference. Its error amplifier compares feedback voltage against this reference to drive a 3.0 A NPN switch via a fixed-gain comparator and driver stage.
Protection logic includes cycle-by-cycle current limit triggered at ≥4.2 A peak switch current and thermal shutdown activation above 150°C junction temperature. The ON/OFF pin accepts TTL-level signals (VIH ≥ 2.2 V, VIL ≤ 0.8 V) to reduce quiescent current to 80 µA while holding output in regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 3.0 A continuous load current - supports high-power microcontroller or FPGA core rails without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - enables direct operation from 12 V/24 V industrial buses or unregulated AC-DC outputs. |
| Output Voltage Range | Adjustable 1.23 V to 37 V via external resistor divider - allows single BOM to support multiple output rails (e.g., 3.3 V, 5 V, 12 V). |
| Switching Frequency | 150 kHz fixed (±15%) - permits use of low-cost, standard-value 33 µH inductors and reduces EMI filtering complexity vs. MHz-range converters. |
| Feedback Reference | 1.23 V ±2.2% (1.193–1.267 V) - sets output accuracy baseline; combined with 1% R1/R2 resistors yields typical output tolerance ≤±3.5%. |
| Standby Current | 80 µA typical at 5 V ON/OFF pin - enables low-power sleep modes in battery-powered systems without auxiliary LDOs. |
| Thermal Shutdown | Activates at TJ ≥ 150°C - protects against sustained overload or poor heatsinking; auto-recovery after cooldown. |
Pinout & Package
LM2596TVADJG uses a 5-lead TO-220 package (Case 314B) with heatsink surface electrically connected to Pin 3 (GND). Mounting requires mechanical isolation from chassis ground unless GND is chassis-referenced.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Vin | Positive input supply | Accepts 4.5–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF aluminum) placed within 5 mm for transient suppression. |
| 2: Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ≤2.0 V at 3.0 A - mandates short PCB trace routing to minimize parasitic inductance and EMI coupling. |
| 3: GND | Circuit ground reference | Common return for input/output capacitors, feedback network, and heatsink; must be single-point connected to avoid ground loops. |
| 4: Feedback | Error amplifier inverting input | Connects to resistor divider (R1/R2) from output; bias current ≤200 nA - requires shielded or short trace to prevent noise injection. |
| 5: ON/OFF | Logic-controlled enable/disable | TTL-compatible: <0.8 V = ON, >2.2 V = OFF; 80 µA standby current when pulled high - usable for MCU-driven power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Internal loop compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity for stable operation across 1.23–37 V outputs. |
| Thermal shutdown + current limit | Self-protecting under overload, short-circuit, or inadequate heatsinking - prevents catastrophic failure without external circuitry. |
| 150 kHz fixed-frequency operation | Enables predictable EMI spectrum and simplifies filter design using off-the-shelf 33 µH inductors rated for ≥150 kHz. |
| TTL-compatible ON/OFF control | Direct interface with 3.3 V/5 V MCUs or logic gates - no level-shifting required for power sequencing or standby mode entry. |
| Moisture Sensitivity Level 1 | Non-hermetic packaging compatible with standard SMT reflow profiles - no baking required prior to assembly. |
Applications
| Industrial Power Supply | Battery Charger Pre-regulator |
|---|---|
Use Scenario: Converting 24 V factory bus to 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5 V @ 2.5 A with line/load regulation < ±0.5%. Use Value: Replaces linear regulators to cut power dissipation by >70%, enabling compact heatsink-free enclosure design. | Use Scenario: Providing stable 12 V intermediate rail for Li-ion battery charging circuits in portable test equipment. IC Role / Device Role / Timing Role: Efficient pre-regulator upstream of linear charger IC, reducing dropout stress and thermal load on final stage. Use Value: Maintains >73% efficiency at 12 V/3 A output from 28 V input, extending runtime and minimizing charger thermal derating. |
| On-Card DC-DC Conversion | Positive-to-Negative Buck-Boost |
Use Scenario: Generating local 3.3 V rail for ARM Cortex-M7 MCU and peripherals on dense PCBs with limited space. IC Role / Device Role / Timing Role: Compact, self-contained buck converter using TO-220-5 package with integrated switch and compensation. Use Value: Achieves full 3.0 A output with only 4 external components (inductor, diode, Cin, Cout), accelerating layout and validation. | Use Scenario: Deriving −5 V rail from existing +12 V supply for op-amp biasing in analog signal conditioning circuits. IC Role / Device Role / Timing Role: Configured as inverting buck-boost converter using standard external components per datasheet Figure 1. Use Value: Delivers regulated −5 V @ 1 A with <100 mV ripple, avoiding need for dedicated inverting IC or transformer-based solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-ADJ (onsemi) | Same die, TO-220-5 package but Case 314D lead bend - identical electrical specs and thermal resistance (RJC = 5.0°C/W). | No functional difference; differs only in lead form (straight vs. gull-wing) - impacts PCB footprint and automated assembly compatibility. | Select LM2596T-ADJ only if board layout or pick-and-place requirements mandate Case 314D lead geometry. |
| MP1584EN-LF-Z (Monolithic Power Systems) | 4 A output, 1.5 MHz switching, smaller SOIC-8 package - higher frequency enables 4.7 µH inductor but requires tighter layout for EMI control. | Not pin-compatible; needs different feedback divider, input/output caps, and inductor - suitable for space-constrained designs prioritizing size over thermal margin. | Choose MP1584EN-LF-Z when board area is critical and 150°C junction operation is not required; verify loop stability with new component values. |
Compared with LM2596T-ADJ, LM2596TVADJG offers identical performance in a lead-bent TO-220 variant optimized for vertical heatsink mounting; versus MP1584EN-LF-Z, it trades higher thermal robustness and simpler EMI filtering for larger footprint and lower switching frequency.
Availability
LM2596TVADJG is available at Aetrix Electronics and suitable for industrial power supplies, battery charger subsystems, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for LM2596TVADJG 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 solutions for automotive, industrial, and cloud infrastructure markets.
The LM2596 series was designed as a cost-optimized, thermally robust buck regulator for high-current industrial and embedded applications where reliability under wide input voltage ranges and ambient temperatures up to 125°C is essential.
FAQ
What is the maximum input voltage rating for LM2596TVADJG?
The absolute maximum input voltage for LM2596TVADJG is 45 V, but the recommended operating range is 4.5 V to 40 V per the datasheet's Operating Ratings. Exceeding 40 V risks violating the 150°C junction temperature limit under load due to increased power dissipation in the internal switch - sustained operation above 40 V requires derating or enhanced heatsinking. Always refer to the Maximum Ratings table for safe design margins.
Does LM2596TVADJG require external compensation components?
No, LM2596TVADJG features internal loop compensation, eliminating the need for external compensation networks such as type-II or type-III compensators. This simplifies design and improves stability across its full output voltage range (1.23 V to 37 V) when used with standard external components (inductor, catch diode, input/output capacitors) per the datasheet's Typical Application circuit. External feedforward capacitor (CFF) is optional for high-input-voltage stability.
What is the thermal resistance (RθJA) of LM2596TVADJG in its TO-220 package?
LM2596TVADJG in the TO-220-5 package (Case 314B) has a thermal resistance of RθJA = 65°C/W when mounted on a standard 1-inch² copper pad with 2 oz copper thickness. Its junction-to-case resistance (RθJC) is 5.0°C/W, meaning effective heatsinking via Pin 3 (GND/heatsink tab) significantly improves thermal performance - adding a 10°C/W heatsink reduces total RθJA to ~15°C/W, enabling full 3.0 A output at 70°C ambient.
Can LM2596TVADJG be used in a negative-output (inverting) configuration?
Yes, LM2596TVADJG can be configured as a positive-to-negative buck-boost converter per Figure 1 in the datasheet, generating regulated negative output voltages (e.g., −5 V, −12 V) from a positive input. This requires repositioning the inductor and diode relative to ground, using the same external component values as the standard buck circuit. Output polarity reversal does not affect internal protection features or regulation accuracy.
What is the minimum output voltage achievable with LM2596TVADJG?
The minimum output voltage of LM2596TVADJG is 1.23 V, set by its internal 1.235 V bandgap reference voltage (VFB). This value is guaranteed across temperature and load conditions, with a tolerance of ±2.2% (1.193 V to 1.267 V). To achieve 1.23 V output, connect the feedback pin directly to the output - no resistor divider is needed. Lower voltages are not supported by the internal reference architecture.
LM2596TVADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- 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:
- 3A
- 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
LM2596TVADJG FAQ
1.How can I place an order for LM2596TVADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596TVADJG 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 LM2596TVADJG reliable?
The price and inventory of LM2596TVADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2596TVADJG is usually 5 days.
3.What payment methods are accepted for LM2596TVADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596TVADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596TVADJG?
LM2596TVADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596TVADJG 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 LM2596TVADJG?
For technical support, including LM2596TVADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596TVADJG requirements.
6.How does Aetrix verify that LM2596TVADJG is sourced from the original manufacturer or authorized distributors?
All LM2596TVADJG 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 LM2596TVADJG meets industry standards.
7.What is the process for return or replacement of LM2596TVADJG?
All LM2596TVADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2596TVADJG, 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 LM2596TVADJG part is unused and in its original packaging.
Return procedure for LM2596TVADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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