MAX8686 Maxim Integrated Products, MAX8686 Datasheet
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MAX8686
Manufacturer Part Number
MAX8686
Description
DC-DC Converter Delivers Up To 25A Per Phase
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8686.pdf
(22 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MAX8686ETL+T
Manufacturer:
MAIXM
Quantity:
3 636
www.DataSheet4U.com
The MAX8686 current-mode, synchronous PWM step-
down regulator with integrated MOSFETs operates from
a 4.5V to 20V input supply and generates an adjustable
output voltage from 0.7V to 5.5V while delivering up to
25A per phase.
The MAX8686 employs a peak current-mode architec-
ture that operates with an adjustable switching frequency
from 300kHz to 1MHz. An adjustable current-limit thresh-
old allows for optimization for different applications with
different load currents. Inductor current sense is
achieved either using an external sense resistor or using
a lossless inductor current-sense scheme. The foldback
and hiccup current limit reduces the power dissipation
during overload or short-circuit conditions and allows for
autorecovery when the fault condition is removed.
The MAX8686 offers the ability to start up monotonically
even when there is a prebias output voltage. In addi-
tion, an adjustable soft-start capability allows for a con-
trolled turn-on. The MAX8686 features an accurate 1%
reference and offers a reference input that allows for a
higher accuracy reference to be used for voltage track-
ing applications such as DDR memory.
The MAX8686 can be paralleled (up to eight) together
in a true multiphase mode to deliver up to 200A of out-
put current. When operating in this mode, this device
achieves better than 10% current balance between
phases at full load. The MAX8686 supports program-
mable phase shedding to improve system efficiency
during light load conditions.
Other features include an enable input and a power-OK
(POK) indicator used for power sequencing. The
MAX8686 also features latch overvoltage protection
that turns on the low-side MOSFET when the output
voltage exceeds 120% of the nominal voltage. The
MAX8686 is offered in a thermally enhanced 40-pin,
6mm x 6mm TQFN package.
19-4113; Rev 0; 5/08
Pin Configuration appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
DC-DC Converter Delivers Up to 25A Per Phase
POL Power Supplies
Module Replacements
Telecom Equipment
Networking Equipment
Servers
DDR Memory
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Single/Multiphase, Step-Down,
♦ Operating Range from 4.5V to 20V Input Supply
♦ 1% Reference Voltage Accuracy Over Temperature
♦ Reference Input (REFIN) for Output Tracking or
♦ Adjustable Switching Frequency from 300kHz
♦ Single/Multiphase Operation Delivers Up to
♦ Adjustable Current Limit
♦ Monotonic Output Voltage at Startup (Prebias)
♦ Output Sink and Source Current Capability
♦ Adjustable Soft-Start
♦ Thermal-Overload Protection
♦ Output Overvoltage Protection
♦ Thermally Enhanced 6mm x 6mm TQFN
+ Denotes a lead-free package.
* EP = Exposed pad.
ENABLE
INPUT
System Reference Voltage
to 1MHz
25A/200A with Integrated MOSFETs
Package (4W)
MAX8686ETL+
V
IN
PART
= 12V
Typical Application Circuit
IN
PGND
PHASE/REFO
COMP
EN/SLOPE
REFIN
FREQ
SS GND
Ordering Information
-40°C to +85°C
MAX8686
TEMP RANGE
ILIM
POK
BST
RS+
CS+
CS-
RS-
LX
Features
PIN-PACKAGE
40 TQFN-EP*
V
OUT
POK
OUTPUT
= 1.2V/25A
1