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Switching Regulator - Switching Regulators 
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MAX8579
3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers
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Key Features
Applications/Uses
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 3 |
| VIN (V) (max) | 28 |
| VOUT1 (V) (min) | 0.6 |
| VOUT1 (V) (max) | 25 |
| IOUT1 (A) (max) | 15 |
| Switch Type | External |
| Output Adjust. Method | Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 500 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | 2.36 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | 3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers | Jul 04, 2005 |
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Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 3 |
| VIN (V) (max) | 28 |
| VOUT1 (V) (min) | 0.6 |
| VOUT1 (V) (max) | 25 |
| IOUT1 (A) (max) | 15 |
| Switch Type | External |
| Output Adjust. Method | Resistor |
| Synchronous Switching? | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 500 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | 2.36 |
Key Features
- 3V to 28V Supply Voltage Range
- 1.2% Accurate Over Temperature
- Adjustable Output Voltage Down to 0.6V
- 200kHz to 500kHz Switching Frequency
- Adjustable Temperature-Compensated Hiccup Current Limit
- Lossless Peak Current Sensing
- Monotonic Startup into Prebias Output (MAX8576/MAX8578)
- Startup Overvoltage Protection (MAX8577/MAX8579)
- Enable/Shutdown
- Adjustable Soft-Start
Applications/Uses
- AGP and PCI Express® Power Supplies
- Graphic-Card Power Supplies
- Motherboard Power Supplies
- Point-of-Load Power Supplies
- Set-Top Boxes
Description
The MAX8576–MAX8579 synchronous PWM buck controllers use a hysteretic voltage-mode control algorithm to achieve a fast transient response without requiring loop compensation. The MAX8576/MAX8577 contain an internal LDO regulator allowing the controllers to function from only one 3V to 28V input supply. The MAX8578/MAX8579 do not contain the internal LDO and require a separate supply to power the IC when the input supply is higher than 5.5V. The MAX8576–MAX8579 output voltages are adjustable from 0.6V to 0.9 x VIN at loads up to 15A.
Nominal switching frequency is programmable over the 200kHz to 500kHz range. High-side MOSFET sensing is used for adjustable hiccup current-limit and short-circuit protection. The MAX8576/MAX8578 can start up into a precharged output without pulling the output voltage down. The MAX8577/MAX8579 have startup output overvoltage protection (OVP), and will pull down a precharged output.
Nominal switching frequency is programmable over the 200kHz to 500kHz range. High-side MOSFET sensing is used for adjustable hiccup current-limit and short-circuit protection. The MAX8576/MAX8578 can start up into a precharged output without pulling the output voltage down. The MAX8577/MAX8579 have startup output overvoltage protection (OVP), and will pull down a precharged output.
Technical Docs
| Data Sheet | 3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers | Jul 04, 2005 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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