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MAX8576, MAX8577, MAX8578, MAX8579
3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 404kB)
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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.

An evaluation kit is available:  MAX8576EVKIT  

Key Features   Applications/Uses
  • 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

 
  • AGP and PCI Express® Power Supplies
  • Graphic-Card Power Supplies
  • Motherboard Power Supplies
  • Point-of-Load Power Supplies
  • Set-Top Boxes

Key Specifications:  Step-Down Switching Regulators
Part Number VIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Max. IOUT
(A)
Max. IOUT
(A)
Output Adjust. Method DC-DC Outputs Oper. Freq.
(kHz)
Package/Pins Smallest Available Pckg.
(mm2)
Price
min max min max max w/pins See Notes
MAX8576  3 28 0.6 25 15 15 Resistor 1 500
µMAX/10
15.4 $0.92 @1k
MAX8577 
µMAX/10
$0.92 @1k
MAX8578 
µMAX/10
$0.92 @1k
MAX8579 
µMAX/10
$0.92 @1k
See All Step-Down Switching Regulators (264)

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

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    Document Ref.: 19-3289; Rev 1; 2005-07-04
    This page last modified: 2009-10-12


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