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3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers

Product Details

Key Features

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

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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.

Simplified Block Diagram

MAX8576, MAX8577, MAX8578, MAX8579: Functional Diagram MAX8576, MAX8577, MAX8578, MAX8579: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .