LM2576T-ADJLB03/NOPB Texas Instruments Integrated Circuit (Other) In Stock
LM2576T-ADJLB03/NOPB is a 3 A adjustable step-down (buck) switching voltage regulator from Texas Instruments' SIMPLE SWITCHER series, with a wide input range up to 40 V and an adjustable output from 1.23 V to 37 V. Key specs: 3 A maximum output current, PWM voltage-mode control at 52 kHz, TO-263-5 surface-mount package. Pb-free and suited for industrial and consumer DC-DC converter designs.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- LM2576T-ADJLB03/NOPB Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3 A output current with up to 40 V input voltage covers a wide range of DC-DC step-down applications from automotive 12 V to industrial 24 V and 36 V buses
- Adjustable output from 1.23 V to 37 V set by two external resistors gives designers flexibility to target any standard logic, memory, or analog supply rail
- Integrated 52 kHz PWM oscillator and internal switch transistor minimize external component count to just an inductor, diode, and capacitors
- SIMPLE SWITCHER architecture with TO-263-5 surface-mount package simplifies PCB layout and thermal management for up to 3 A continuous load
Applications
LM2576T-ADJLB03/NOPB is used in industrial power supplies, embedded system boards, and battery chargers where a wide-input DC bus from 4.75 V to 40 V must be regulated down to a precise adjustable output at up to 3 A. Its simple external circuit of one inductor, one diode, and two capacitors reduces design time and BOM cost compared to multi-chip solutions. Automotive accessory power supplies, LED driver pre-regulators, and laboratory bench supply modules also leverage the wide 1.23 V to 37 V output range to support multiple target voltages from a single hardware design.
Specifications
| YTEOL | 0 |
| Additional Feature | ALSO HAS ADJUSTABLE OUTPUTS AS 1.23 V TO 37 V |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 40V |
| JESD-30 Code | R-XSFM-T5 |
| Number of Functions | 1 |
| Output Current-Max | 3A |
| Output Voltage-Max | 37V |
| Output Voltage-Min | 1.23V |
| Package Body Material | UNSPECIFIED |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 63kHz |
| Temperature Grade | AUTOMOTIVE |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM2576T-ADJLB03/NOPB:
suggested
Switching Regulator, Voltage-mode, 3A, 63kHz Switching Freq-Max, PSFM5
Frequently Asked Questions
What external components does the LM2576T-ADJLB03/NOPB require to build a complete 12 V to 5 V, 3 A buck converter?
A complete LM2576T-ADJLB03/NOPB buck converter needs a 100 µH inductor rated at 3 A, a 100 µF output capacitor, a 100 µF input capacitor, a Schottky catch diode rated at 3 A and 40 V, and two resistors to set the output voltage. With a 12 V input and 5 V target output, the typical inductor value from the datasheet nomograph is 100 µH, and the resistor divider sets VOUT = 1.23 V × (1 + R1/R2).
How does the 52 kHz switching frequency of the LM2576T-ADJLB03/NOPB affect inductor size and output ripple?
At 52 kHz, the LM2576T-ADJLB03/NOPB requires a relatively large inductor in the 68 µH to 680 µH range depending on input voltage and output current, compared to MHz-frequency converters that use sub-10 µH inductors. The lower switching frequency reduces switching losses and gate drive power but increases inductor physical size. Output ripple is typically 1% to 3% of VOUT with a 100 µF electrolytic output capacitor, which is acceptable for most digital and linear-post-regulated supplies.
For a 24 V industrial input to a 12 V, 2 A output, what efficiency can be expected from the LM2576T-ADJLB03/NOPB?
In a 24 V to 12 V step-down application at 2 A, the LM2576T-ADJLB03/NOPB typically achieves 75% to 80% efficiency. The duty cycle is approximately 50%, and switching losses at 52 kHz are moderate. Using a low forward-voltage Schottky diode (such as a 1N5822 with 0.5 V forward drop) recovers an additional 2% to 3% efficiency compared to a standard rectifier diode, bringing overall efficiency closer to 82%.
How does the LM2576T-ADJLB03/NOPB compare to the LM2596 when selecting a buck regulator for a 40 V, 3 A industrial supply?
Both the LM2576T-ADJLB03/NOPB and LM2596 support up to 40 V input and 3 A output, but the LM2596 switches at 150 kHz versus 52 kHz for the LM2576, allowing smaller inductors (typically 33 µH vs. 100 µH at the same operating point). The LM2576 is preferred when larger inductors are acceptable and lower switching losses are a priority, while the LM2596 suits designs where PCB area is constrained and a smaller magnetic component is required.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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