MAX8576EUB Maxim Integrated Products, MAX8576EUB Datasheet

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MAX8576EUB

Manufacturer Part Number
MAX8576EUB
Description
DC/DC Switching Controllers 3-28V Hystrtic Synch Step-Down Controller
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8576EUB

Number Of Outputs
1
Output Voltage
0.6 V to 25 V
Output Current
15 A
Input Voltage
3 V to 28 V
Mounting Style
SMD/SMT
Package / Case
uMAX-10
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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The MAX8576–MAX8579 synchronous PWM buck con-
trollers 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 func-
tion 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
Nominal switching frequency is programmable over the
200kHz to 500kHz range. High-side MOSFET sensing is
used for adjustable hiccup current-limit and short-cir-
cuit protection. The MAX8576/MAX8578 can start up
into a precharged output without pulling the output volt-
age down. The MAX8577/MAX8579 have startup output
overvoltage protection (OVP), and will pull down a
precharged output.
19-3289; Rev 1; 6/05
µMAX is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Motherboard Power Supplies
AGP and PCI-Express Power Supplies
Graphic-Card Power Supplies
Set-Top Boxes
Point-of-Load Power Supplies
IN
at loads up to 15A.
INPUT
UP TO 28V
________________________________________________________________ Maxim Integrated Products
General Description
3V to 28V Input, Low-Cost, Hysteretic
Synchronous Step-Down Controllers
FB
SS
GND
DL
VL
Applications
MAX8576
MAX8577
OCSET
BST
DH
LX
IN
♦ 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
♦ Lossless Peak Current Sensing
♦ Monotonic Startup into Prebias Output
♦ Startup Overvoltage Protection
♦ Enable/Shutdown
♦ Adjustable Soft-Start
Pin Configurations appear at end of data sheet.
MAX8576EUB
MAX8577EUB
MAX8578EUB
MAX8579EUB
Current Limit
(MAX8576/MAX8578)
(MAX8577/MAX8579)
PART
Typical Operating Circuit
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
OUTPUT
0.6V TO 0.9 x
V
IN
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
Features
®
1

Related parts for MAX8576EUB

MAX8576EUB Summary of contents

Page 1

... 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 PART MAX8576EUB MAX8577EUB MAX8578EUB MAX8579EUB OCSET IN MAX8576 DH MAX8577 LX BST Pin Configurations appear at end of data sheet. ...

Page 2

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers ABSOLUTE MAXIMUM RATINGS IN to GND (MAX8576/MAX8577) ...........................-0.3V to +30V VL to GND (MAX8576/MAX8577).............................-0. (MAX8576/MAX8577) ...............................-0.3V to +30V V to GND (MAX8578/MAX8579) ..........................-0.3V to +6V CC ...

Page 3

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers ELECTRICAL CHARACTERISTICS (continued 12V (MAX8576/MAX8577 only), 4.7µF capacitor from VL (MAX8576/MAX8577 only (MAX8578/MAX8579 only); 0.01µF capacitor from SS to GND; V ...

Page 4

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers ELECTRICAL CHARACTERISTICS (continued 12V (MAX8576/MAX8577 only), 4.7µF capacitor from VL (MAX8576/MAX8577 only (MAX8578/MAX8579 only); 0.01µF capacitor from SS to GND; V ...

Page 5

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers (T = +25 C, unless otherwise noted.) A EFFICIENCY vs. LOAD CURRENT (CIRCUIT OF FIGURE 2) 100 V = 2.5V OUT V = 3.3V OUT 1.8V V ...

Page 6

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers ( T = +25 C, unless otherwise noted.) A POWER-UP V (CIRCUIT OF FIGURE OUT I LX 400 s/div POWER-DOWN V (CIRCUIT OF FIGURE 3) ...

Page 7

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers ( T = +25 C, unless otherwise noted.) A STARTUP AND SHUTDOWN (CIRCUIT OF FIGURE 2) V GS(Q3 OUT I LX NONMONOTONIC OUTPUT-VOLTAGE RISE (CIRCUIT OF FIGURE 2, ...

Page 8

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers PIN NAME MAX8576/ MAX8578/ MAX8577 MAX8579 Feedback Input. Regulates voltage. See the Setting the Output Voltage section. S oft- S tar exter ...

Page 9

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers OCSET MAX8578/ GND MAX8579 EN 0.3 FB 0.75V SS SS RAMP 0.05V IN MAX8576 MAX8577 MAX8578 MAX8579 Figure 1. Functional Diagram _______________________________________________________________________________________ FAULT LX DHI DRIVERS OVP LOGIC ...

Page 10

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers INPUT 9V TO 24V R1 C4 OFF 12V INPUT, 1.8V/12A OUTPUT (f CIRCUIT IS TARGETED FOR 10.8V TO 13.2V INPUT. HOWEVER, INPUT RANGE ...

Page 11

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers MAX8576/MAX8577 External Component List DESCRIPTION/VENDOR PART COMPONENTS QTY 470µF, 35V aluminum electrolytic C1 capacitors Sanyo 35MV470WX C3 1 10µF, 25V X7R ceramic capacitor C4 1 0.01µF, 10V X7R ceramic ...

Page 12

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers Nominal switching frequency is programmable over the 200kHz to 500kHz range. High-side MOSFET sensing is used for adjustable hiccup current-limit and short-cir- cuit protection. The MAX8576/MAX8578 can start up into a ...

Page 13

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers to SS. See Figure 2 for details. The maximum on-resis- tance of the small external n-channel MOSFET should be less than 40 so that the SS voltage is below 10mV. Synchronous-Rectifier ...

Page 14

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers OUT where V = 0.590V the DC resistance of the FB DC output inductor ...

Page 15

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers N1 operates as a duty-cycle control switch and has the following major losses: the channel-conduction loss (P ), the VL overlapping switching loss (P N1CC and the drive loss (P ). ...

Page 16

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers chosen based on a prototype or evaluation circuit general rule, a smaller current ripple results in less out- put voltage ripple. Since the inductor ripple current is a factor ...

Page 17

Input, Low-Cost, Hysteretic Synchronous Step-Down Controllers 1) Place IC decoupling capacitors as close to IC pins as possible. Place the input ceramic decoupling capacitor directly across and as close as possible to the high-side MOSFET’s drain and ...

Page 18

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products 4X S ...

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