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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8686 Datasheet

DC-DC Converter Delivers Up To 25A Per Phase

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19-4113; Rev 1; 10/10
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
General Description
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.
Applications
POL Power Supplies
Module Replacements
Telecom Equipment
Networking Equipment
Servers
DDR Memory
Pin Configuration appears at end of data sheet.
Features
o Operating Range from 4.5V to 20V Input Supply
o 1% Reference Voltage Accuracy Over Temperature
o Reference Input (REFIN) for Output Tracking or
System Reference Voltage
o Adjustable Switching Frequency from 300kHz
to 1MHz
o Single/Multiphase Operation Delivers Up to
25A/200A with Integrated MOSFETs
o Adjustable Current Limit
o Monotonic Output Voltage at Startup (Prebias)
o Output Sink and Source Current Capability
o Adjustable Soft-Start
o Thermal-Overload Protection
o Output Overvoltage Protection
o Thermally Enhanced 6mm x 6mm TQFN
Package (4W)
Ordering Information
PART
TEMP RANGE
MAX8686ETL+
-40°C to +85°C
+Denotes a lead-free package.
*EP = Exposed pad.
PIN-PACKAGE
40 TQFN-EP*
Typical Application Circuit
VIN = 12V
ENABLE
INPUT
IN
PGND
BST
LX
REFIN MAX8686
PHASE/REFO
COMP
EN/SLOPE
RS+
RS-
CS+
CS-
POK
FREQ SS GND
ILIM
VOUT = 1.2V/25A
POK
OUTPUT
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8686 Datasheet

DC-DC Converter Delivers Up To 25A Per Phase

No Preview Available !

Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
ABSOLUTE MAXIMUM RATINGS
IN, INA to PGND.....................................................-0.3V to +22V
BST, DH to LX...........................................................-0.3V to +6V
BST to PGND..........................................................-0.3V to +28V
LX to PGND...........................-0.3V to (VIN + 0.3V) (-2V for 50ns)
BST to VL................................................................-0.3V to +22V
AVL to GND.................................................-0.3V to (VVL + 0.3V)
COMP, ILIM, FREQ, PHASE/REFO, RS+, RS-, POK, REFIN,
CS+, CS- to GND ..................................-0.3V to (VAVL + 0.3V)
VL to PGND ..............................................................-0.3V to +6V
EN/SLOPE to GND ...................................................-0.3V to +6V
RTN to PGND to GND to GFREQ ..........................-0.3V to +0.3V
IN Continuous Current.....................................................20ARMS
LX Continuous Current ....................................................25ARMS
Continuous Power Dissipation (TA = +70°C) (Note 1)
40-Pin TQFN (derate 50mW/°C above +70°C) ..........4000mW
θJC (thermal resistance from junction to exposed pad)
(Note 1) ......................................................................3.5°C/W
θJT (thermal resistance from junction to top) (Note 1) ...3.9°C/W
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
Soldering Temperature (reflow) .......................................+260°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations see www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(VIN = VINA = 12V, VL = AVL, VREFIN = 1V, VRS+ - VRS- = 1V, VRS- = 0V, VEN/SLOPE = 1.25V, VCS+ = VCS- = 1V, RILIM = 122kΩ, CVL = 1μF,
CAVL = 0.22μF, CFREQ = 270pF, TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
GENERAL
Operating Input-Voltage Range
Operating Input-Voltage Range
IN/INA Shutdown Supply Current
VINA = VIN , TA = -40°C to +85°C
VIN = VINA = VVL = VAVL, TA = -40°C to +85°C
VEN/SLOPE = 0V,
VIN = VINA = 20V
TA = +25°C
TA = +85°C
IN/INA Quiescent Supply Current VRS+ = 1.1V, no switching; VIN = VINA = 20V,
TA = -40°C to +85°C
AVL Undervoltage Lockout Trip
Level
Rising, TA = -40°C to +85°C
Falling
VL Output Voltage
6V VIN = VINA 20V, 1mA IVL 30mA,
TA = -40°C to +85°C
SOFT-START (SS)
SS Shutdown Resistance
VEN/SLOPE = 0V (master mode)
SS Soft-Start Current
VSS = 0.4V and 1.1V, TA = -40°C to +85°C
PHASE COMPARATOR AND REFERENCE (PHASE/REFO)
Reference Output Voltage
Measured at PHASE/REFO (master mode),
TA = -40°C to +85°C
PHASE Comparator Offset
VRS- = VAVL (slave mode), VPHASE = 0.3V and 2.5V,
TA = -40°C to +85°C
REFIN INPUT
REFIN Input Bias Current
REFIN Input Voltage Range
VREFIN = 0.7V or 3.3V
MIN TYP MAX UNITS
6 20
4.5 5.5
450
500
5.5 6.6
4.2 4.35 4.45
4.03
5.2 5.4 5.5
V
V
μA
mA
V
V
20 100
Ω
19 25 31
μA
3.267 3.300 3.333
V
-20 +20 mV
-500
0
+500
3.3
nA
V
2 _______________________________________________________________________________________


Part Number MAX8686
Description DC-DC Converter Delivers Up To 25A Per Phase
Maker Maxim Integrated Products
PDF Download

MAX8686 Datasheet PDF






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