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Part Number: MAX8578
Description: The MAX8576MAX8579 synchronous PWM buck controllers use a hysteretic voltage-mode control algorithm to...
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MAX8578
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General Description
MAX8578 General Description
The MAX8576MAX8579 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 MAX8576MAX8579 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.
MAX8578 Maximum Ratings
IN to GND (MAX8576/MAX8577) ..........................-0.3V to +30V
VL to GND (MAX8576/MAX8577).............................-0.3V to +6V
IN to VL (MAX8576/MAX8577) .............................-0.3V to +30V
VCC to GND (MAX8578/MAX8579) ..........................-0.3V to +6V
SS to GND (MAX8576/MAX8577) ...............-0.3V to (VVL + 0.3)V
SS to GND (MAX8578/MAX8579)...............-0.3V to (VCC + 0.3)V
DL to GND (MAX8576/MAX8577) ...............-0.3V to (VVL + 0.3)V
DL to GND (MAX8578/MAX8579) ..............-0.3V to (VCC + 0.3)V
BST to GND...........................................................-0.3V to +36V
BST to LX................................................................-0.3V to +6V
LX to GND ...................-1V (-2.5V for <50ns Transient) to +30V
DH to LX................................................-0.3V to +(VBST + 0.3)V
FB to GND ..............................................................-0.3V to +6V
EN to GND (MAX8578/MAX8679EUB)......................-0.3V to +6V
OCSET to GND (MAX8576/MAX8677) ........-0.3V to (VIN + 0.3)V
OCSET to GND (MAX8578/MAX8679) ...................-0.3V to +30V
OCSET to LX (MAX8576/MAX8677) ...........-0.6V to (VIN + 0.3)V
OCSET to LX (MAX8578/MAX8679).......................-0.6V to +30V
DH and DL Continuous Current ............................±250mA RMS
Continuous Power Dissipation (TA = +70°C)
10-Pin MAX (derate 5.6mW/°C above +70°C) .........444mW
Operating Temperature Range ........................-40°C to +85°C
Junction Temperature.....................................................+150°C
Storage Temperature Range ..........................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
MAX8578 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
· 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
MAX8578 Typical Application
·Motherboard Power Supplies
·AGP and PCI-Express Power Supplies
·Graphic-Card Power Supplies
·Set-Top Boxes
·Point-of-Load Power Supplies
·AGP and PCI-Express Power Supplies
·Graphic-Card Power Supplies
·Set-Top Boxes
·Point-of-Load Power Supplies
MAX8578 Connection Diagram
MAX8578
PDF/DataSheet Download
- Datasheet: MAX8578
- File Size: 301583 KB
- Manufacturer: MAXIM
- Click here to Download
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