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onsemi LM2575D2T-ADJG
- Part No.:
- LM2575D2T-ADJG
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2575D2T-ADJG.pdf
- Description:
- IC REG BUCK ADJ 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,420
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Product details
Overview
LM2575D2T-ADJG from onsemi is a monolithic step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), 1.0 A guaranteed output current, 4.75 V to 40 V wide input range, and fixed 52 kHz internal oscillator. It integrates a 1.0 A NPN switch, error amplifier, oscillator, and thermal/current protection - designed for high-efficiency DC-DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the LM2575D2T-ADJG datasheet, pinout, applications, or equivalent options, key selection considerations include feedback voltage tolerance (±4% over line/load), standby quiescent current (80 µA typical), thermal shutdown behavior, and D2PAK package thermal resistance (RJC = 5.0 °C/W).
Technical Context
The LM2575D2T-ADJG implements a voltage-mode controlled buck converter with internal 1.23 V bandgap reference, fixed-frequency 52 kHz oscillator (±10% tolerance), and cycle-by-cycle current limiting. Its feedback pin (Pin 4) directly connects to the error amplifier's non-inverting input, enabling precise output regulation via external resistor divider.
It features TTL-compatible ON/OFF control (logic-high >2.2 V shuts down regulator), 1.0 V typical saturation voltage at 1.0 A, and self-protective frequency foldback to ~18 kHz under overload - reducing average power dissipation during fault conditions without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.0 A continuous - supports medium-power loads without external pass devices or heatsink in many cases. |
| Input Voltage Range | 4.75 V to 40 V - accommodates 5 V, 12 V, 24 V, and 36 V nominal rails with margin for transients. |
| Feedback Voltage | 1.23 V ±4% - sets output via R1/R2 divider; enables 1.23–37 V adjustment with stable regulation across temperature. |
| Oscillator Frequency | 52 kHz ±10% (−40°C to +125°C) - balances EMI, inductor size, and efficiency; no external timing components required. |
| Standby Quiescent Current | 80 µA typical - enables low-power shutdown mode suitable for battery-backed or energy-sensitive applications. |
| Saturation Voltage | 1.0 V typical at 1.0 A - defines minimum dropout headroom; impacts efficiency and thermal design at high IOUT. |
| Thermal Resistance (Junction-to-Case) | 5.0 °C/W - enables direct heatsink mounting to Pin 3 (GND) for high-power operation in D2PAK package. |
Pinout & Package
D2PAK (TO-263) package, Case 936A: thermally enhanced surface-mount housing with heatsink surface (terminal 6) electrically connected to Pin 3 (GND). Requires PCB copper area for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.75–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF/50 V) placed adjacent to minimize switching noise. |
| 2 - Output | Emitter of internal NPN switch | Switching node driving inductor; PCB copper area must be minimized to reduce EMI coupling into sensitive circuits. |
| 3 - GND | Circuit ground / heatsink connection | Common return path and thermal interface; must connect to large copper pour or heatsink for thermal management. |
| 4 - Feedback | Error amplifier input | High-impedance node sensing output voltage via external R1/R2; must be routed short and away from noisy traces. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible input: ≤1.2 V = ON, ≥2.2 V = OFF; draws only 15–30 µA when active, 80 µA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.0 A NPN switch | Eliminates need for external power transistor; reduces BOM count and layout complexity in buck designs. |
| Fixed 52 kHz oscillator | Enables use of standard, low-cost inductors (e.g., 330 µH) without custom magnetics or frequency tuning. |
| Cycle-by-cycle current limit | Protects against short-circuit and overload without latch-up; allows automatic recovery after fault removal. |
| Thermal shutdown | Halts switching when junction exceeds ~150°C; prevents permanent damage during sustained overload or poor heatsinking. |
| Adjustable output (1.23–37 V) | Supports wide range of system voltages using only two external resistors - ideal for multi-rail or configurable power supplies. |
Applications
| Industrial Power Supply | Embedded System DC-DC Converter |
|---|---|
|
Use Scenario: Converting 24 V factory bus to 5 V or 12 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 1.0 A output with line/load regulation <±1%. Use Value: High efficiency (>77% at 12 VIN/5 VOUT) reduces heat generation in enclosed enclosures without forced air cooling. |
Use Scenario: On-board power for microcontroller-based edge devices powered from 12 V automotive or PoE-derived rails. IC Role / Device Role / Timing Role: Compact, single-chip buck converter replacing linear regulators to extend battery life and reduce board space. Use Value: 80 µA standby current enables ultra-low-power sleep modes; D2PAK package allows direct heatsink attachment for thermal reliability. |
| Battery Charger Pre-regulator | Positive-to-Negative Converter (Buck-Boost) |
|
Use Scenario: Pre-regulating variable solar or adapter input before linear charging ICs for Li-ion packs. IC Role / Device Role / Timing Role: Efficient intermediate stage lowering input voltage to minimize dropout and power loss in downstream LDOs. Use Value: Wide 4.75–40 V input range accepts fluctuating sources; adjustable output allows precise setting of charger input voltage. |
Use Scenario: Generating −5 V or −12 V rail from +12 V supply for op-amp biasing or analog signal conditioning. IC Role / Device Role / Timing Role: Reconfigured as inverting buck-boost topology using standard external components per datasheet Figure 1. Use Value: Leverages same 52 kHz switching frequency and current-limit protection - no additional controller IC needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576D2T-ADJ | Higher peak current limit (3.0 A vs. 2.3 A typ.), lower quiescent current (5.5 mA vs. 5.0–9.0 mA), same 52 kHz frequency and D2PAK package. | Preferred for higher transient load demands or tighter thermal budgets where 1.0 A continuous is insufficient. | Select LM2576D2T-ADJ if output current headroom or lower no-load consumption is critical; verify feedback loop stability with existing compensation. |
| MP1584EN-LF-Z | Higher switching frequency (1.5 MHz), smaller external components, but lower max input (28 V) and no integrated catch diode driver. | Better suited for space-constrained designs requiring compact inductors/caps; not drop-in due to different pinout and control architecture. | Choose MP1584EN-LF-Z for portable or high-density layouts; redesign PCB and recalculate R1/R2 for 0.8 V reference instead of 1.23 V. |
Compared with LM2576D2T-ADJ, LM2575D2T-ADJG offers lower cost and proven robustness in industrial environments but less current headroom; versus MP1584EN-LF-Z, it trades higher EMI and larger passives for wider VIN range and simpler external component requirements.
Availability
LM2575D2T-ADJG is available at Aetrix Electronics and suitable for industrial power supplies, embedded system DC-DC conversion, and battery charger pre-regulation requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for LM2575D2T-ADJG 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, and sensing technologies for automotive, industrial, and cloud infrastructure markets.
The LM2575 series was engineered as a cost-optimized, easy-to-use monolithic buck regulator family targeting medium-current (≤1.0 A), medium-voltage (≤40 V) applications where simplicity, thermal robustness, and minimal external parts are prioritized over ultra-high efficiency or miniaturization.
FAQ
What is the maximum input voltage rating for LM2575D2T-ADJG?
The absolute maximum input voltage for LM2575D2T-ADJG is 45 V, but the recommended operating maximum is 40 V per the datasheet's Operating Ratings. Exceeding 40 V risks violating safe operating area limits and may trigger thermal shutdown or reduce long-term reliability - always maintain ≥5 V margin below 45 V in production designs.
How do I calculate the output voltage for LM2575D2T-ADJG?
LM2575D2T-ADJG uses the formula VOUT = 1.23 V × (1 + R2/R1), where R1 connects from Feedback (Pin 4) to GND and R2 connects from Output (Pin 2) to Feedback (Pin 4). R1 should be between 1.0 kΩ and 5.0 kΩ; for example, R1 = 1.2 kΩ and R2 = 4.98 kΩ yields VOUT ≈ 6.2 V. The 1.23 V reference has ±4% tolerance over line/load/temperature.
Does LM2575D2T-ADJG require an external catch diode?
Yes, LM2575D2T-ADJG requires an external Schottky catch diode (e.g., 1N5819 or MBR320) connected from Output (Pin 2) to GND. The diode must handle ≥1.2× the maximum load current and have reverse voltage rating ≥1.25× the maximum input voltage - omission causes catastrophic failure due to inductive kickback.
What thermal performance can be expected from the D2PAK package of LM2575D2T-ADJG?
LM2575D2T-ADJG in D2PAK (Case 936A) has RJC = 5.0 °C/W and RJA = 70 °C/W (with standard 1-in² 2-oz copper). With proper heatsinking to Pin 3 (GND), junction temperature rise is ~5 °C per watt - enabling full 1.0 A output at ambient up to +85°C without forced airflow when mounted on ≥2 cm² copper area.
Can LM2575D2T-ADJG be used in a negative-output configuration?
Yes, LM2575D2T-ADJG can generate negative output voltages by configuring it as an inverting buck-boost converter per Figure 1 in the datasheet. In this topology, the input ground becomes the negative output rail, and the IC's GND pin connects to the negative output. Output polarity reverses, but all electrical specs (current, frequency, protection) remain valid.
LM2575D2T-ADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 1A
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2575D2T-ADJG FAQ
1.How can I place an order for LM2575D2T-ADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2575D2T-ADJG 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 LM2575D2T-ADJG reliable?
The price and inventory of LM2575D2T-ADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2575D2T-ADJG is usually 5 days.
3.What payment methods are accepted for LM2575D2T-ADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2575D2T-ADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2575D2T-ADJG?
LM2575D2T-ADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2575D2T-ADJG 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 LM2575D2T-ADJG?
For technical support, including LM2575D2T-ADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2575D2T-ADJG requirements.
6.How does Aetrix verify that LM2575D2T-ADJG is sourced from the original manufacturer or authorized distributors?
All LM2575D2T-ADJG 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 LM2575D2T-ADJG meets industry standards.
7.What is the process for return or replacement of LM2575D2T-ADJG?
All LM2575D2T-ADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2575D2T-ADJG, 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 LM2575D2T-ADJG part is unused and in its original packaging.
Return procedure for LM2575D2T-ADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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