HG2576
High-efficiency 3A step-down DC-DC converter with 5V/12V/ADJ output, up to 95% efficiency and wide 4V-40V input range
Product Overview
Description
HG2576 is a high-efficiency step-down switching regulator capable of delivering up to 3A output current with excellent efficiency up to 95%.
With a wide input voltage range of 4V to 40V and fixed/adjustable output options (5V, 12V, or adjustable), this DC-DC converter is suitable for a broad range of industrial and consumer applications.
The device features internal frequency compensation, current limiting, and thermal shutdown protection, requiring minimal external components for a complete power supply solution.
Product Series
HG
Primary Application
Industrial power supplies
Key Features
- High efficiency up to 95% reduces heat dissipation
- Wide 4V to 40V input voltage range
- 3A output current capability
- Fixed 5V/12V and adjustable output versions
- Internal frequency compensation
- Current limit and thermal shutdown protection
- Requires only 4 external components
- Available in TO-220 and TO-263 packages
Specifications
| Input Voltage Range | 4V to 40V |
|---|---|
| Output Voltage | 5V fixed, 12V fixed, or 1.23V-37V adjustable |
| Output Current | 3A maximum |
| Switching Frequency | 52kHz typical |
| Efficiency | Up to 95% |
| Line Regulation | 0.5% typical |
| Load Regulation | 1.0% typical |
| Quiescent Current | 5mA typical |
| Package | TO-220-5, TO-263-5 |
Applications
Industrial power supplies
Industrial automation and control
Battery chargers
Battery and charging management
LED drivers
Motor drive and control systems
Distributed power systems
Electronic system design
Preregulator for linear regulators
Power conversion and supply
Automotive electronics
Automotive and EV electronics
Consumer electronics
Consumer electronics
FAE Expert Insights
"HG2576 is my recommended choice for medium-power DC-DC conversion applications. The 95% efficiency is excellent and significantly reduces thermal management challenges compared to linear regulators. I've successfully used this part in industrial control systems where input voltage varies widely. The fixed 5V and 12V versions simplify design, while the adjustable version provides flexibility for custom voltages. The TO-220 package handles 3A easily with minimal heatsinking. For best EMI performance, I recommend proper input capacitor placement and keeping the switching loop area small. This is a cost-effective alternative to LM2576 with equivalent performance."
95% efficiency with wide 4V-40V input range
— David Chen, BeiLuo
Frequently Asked Questions
What is the difference between HG2576-5.0, HG2576-12, and HG2576-ADJ?
HG2576-5.0 has a fixed 5V output voltage, requiring only input and output capacitors. HG2576-12 has a fixed 12V output. HG2576-ADJ is the adjustable version where output voltage is set by two external resistors using the formula Vout = 1.23V × (1 + R2/R1). The fixed versions simplify design and reduce component count, while the adjustable version provides flexibility for non-standard voltages. All versions have the same electrical characteristics except for output voltage setting.
Use fixed versions for standard 5V or 12V rails to simplify design. Use ADJ version for custom voltages. Contact our FAE team for resistor selection calculations.
How do I select the input capacitor for HG2576?
The input capacitor for HG2576 should be a low-ESR aluminum electrolytic or tantalum capacitor. Recommended value is 100μF to 470μF with voltage rating at least 1.5 times the maximum input voltage. For 24V input, use 50V rated capacitor. The input capacitor filters the pulsating input current and prevents voltage transients. Place it as close as possible to the IC input pin with short leads. For high input voltage applications (>25V), consider adding a 0.1μF ceramic capacitor in parallel for high-frequency filtering.
Use 100μF-470μF low-ESR capacitor with adequate voltage rating. Place close to IC. Our FAE team can provide input capacitor selection guidelines.
What inductor value should I use with HG2576?
HG2576 operates at 52kHz switching frequency. Recommended inductor values are: 100μH for 1A output, 68μH for 2A output, and 47μH for 3A output. The inductor must be rated for the peak current (typically 1.5x average output current) and have low DC resistance to minimize losses. Shielded inductors are recommended for reduced EMI. The inductor saturation current rating should exceed the maximum switch current limit (typically 4.5A). Popular choices include toroidal or drum core inductors from manufacturers like Coilcraft, Wurth, or Bourns.
Select inductor based on output current: 47-100μH range. Ensure saturation current rating exceeds peak current. Contact our FAE team for inductor recommendations.
How do I calculate power dissipation and heatsink requirements?
HG2576 power dissipation is calculated as Pd = (Vout/Vin) × Iout × (1 - efficiency). For example, with 24V input, 5V output, 3A load, and 85% efficiency: Pd = (5/24) × 3 × (1 - 0.85) = 0.094W. At 40V input: Pd = (5/40) × 3 × 0.15 = 0.056W. The TO-220 package has thermal resistance of about 2.5°C/W junction-to-case. With 0.1W dissipation, temperature rise is minimal. However, at higher loads or lower efficiency, calculate junction temperature as Tj = Ta + (Pd × Rθja). Ensure Tj stays below 125°C maximum.
Calculate dissipation based on your operating conditions. TO-220 typically doesn't need heatsinking for most applications. Our FAE team can provide thermal analysis.
Can HG2576 be used for negative output voltages?
Yes, HG2576 can be configured for negative output voltages using a buck-boost topology. The circuit requires an additional inductor and diode compared to standard buck configuration. Output voltage is inverted relative to input ground. Maximum output current is reduced in this configuration due to higher switch currents. For negative outputs, the feedback pin senses the negative output relative to the IC ground. This configuration is useful for generating negative rails for op-amp circuits or analog systems from positive inputs.
For negative outputs, use buck-boost configuration. Contact our FAE team for negative output application circuit and component selection.
What is the output voltage accuracy of HG2576?
HG2576 output voltage accuracy is ±4% for the fixed versions (5V and 12V) over line, load, and temperature variations. The adjustable version accuracy depends on the tolerance of external feedback resistors. Using 1% tolerance resistors provides approximately ±5% overall accuracy. Line regulation is typically 0.5% and load regulation is 1.0%. For applications requiring higher accuracy, consider adding a post-regulator LDO (like HG6206) after the switching regulator. The LDO will clean up the switching ripple and provide tighter regulation.
For 4% accuracy, use HG2576 directly. For higher accuracy, add LDO post-regulator. Contact our FAE team for high-accuracy power supply designs.