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

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 V_IN 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.

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

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX8576

0.6

Resistor

500

•	Adjustable Frequency

•	Current Limit

•	Fixed Frequency/ PWM Operation

•	Output Overvoltage Protection

•	Output Undervoltage Protection

•

Shutdown

•	Soft Start

•	Synchronous Rectifier

Yes

uMAX/10

Yes

-40 to +85

$0.92 @ 1k

MAX8577

$0.92 @ 1k

MAX8578

$0.92 @ 1k

MAX8579

$0.92 @ 1k

See All Step-Down Switching Regulators (223)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-16 of 16

MAX8576

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8576EUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8576EUB+T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8576EUB+

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8576EUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8577

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8577EUB+

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8577EUB-T

-40°C to +85°C

See data sheet

MAX8577EUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8577EUB+T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8578

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8578EUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8578EUB+

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8578EUB+T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8578EUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8579

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8579EUB-T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8579EUB

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10-2*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8579EUB+

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8579EUB+T

uMAX;10 pin;
Dwg: 21-0061L (PDF)
Use pkgcode/variation: U10+2*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis