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MAX8686ETL+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
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
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)
MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
________________________________________________________________
Maxim Integrated Products
1
IN
POK
OUTPUT
ENABLE
INPUT
BST
LX
V
IN
= 12V
V
OUT
= 1.2V/25A
PGND
PHASE/REFO
COMP
EN/SLOPE
FREQ
SS GND ILIM
MAX8686
REFIN
RS+
RS-
CS+
CS-
POK
Typical Application Circuit
Ordering Information
19-4113; Rev 1; 10/10
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.
PART TEMP RANGE
PIN-PACKAGE
MAX8686ETL+ -40°C to +85°C 40 TQFN-EP*
+
Denotes a lead-free package.
*
EP = Exposed pad.
Pin Configuration appears at end of data sheet.
MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
INA
= 12V, VL = AVL, V
REFIN
= 1V, V
RS+
- V
RS-
= 1V, V
RS-
= 0V, V
EN/SLOPE
= 1.25V, V
CS+
= V
CS-
= 1V, R
ILIM
= 122kΩ, C
VL
= 1μF,
C
AVL
= 0.22μF, C
FREQ
= 270pF, T
A
= +25°C, unless otherwise noted.) (Note 2)
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.
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 (V
IN
+ 0.3V) (-2V for 50ns)
BST to VL................................................................-0.3V to +22V
AVL to GND.................................................-0.3V to (V
VL
+ 0.3V)
COMP, ILIM, FREQ, PHASE/REFO, RS+, RS-, POK, REFIN,
CS+, CS- to GND ..................................-0.3V to (V
AVL
+ 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.....................................................20A
RMS
LX Continuous Current ....................................................25A
RMS
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
40-Pin TQFN (derate 50mW/°C above +70°C) ..........4000mW
θ
JC
(thermal resistance from junction to exposed pad)
(Note 1) ......................................................................3.5°C/W
θ
JT
(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
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
Operating Input-Voltage Range V
INA
= V
IN
, T
A
= -40°C to +85°C 6 20 V
Operating Input-Voltage Range V
IN
= V
INA
= V
VL
= V
AVL
, T
A
= -40°C to +85°C 4.5 5.5 V
T
A
= +25°C 450
IN/INA Shutdown Supply Current
V
EN/SLOPE
= 0V,
V
IN
= V
INA
= 20V
T
A
= +85°C 500
μA
IN/INA Quiescent Supply Current
V
RS+
= 1.1V, no switching; V
IN
= V
INA
= 20V,
T
A
= -40°C to +85°C
5.5 6.6 mA
Rising, T
A
= -40°C to +85°C 4.2 4.35 4.45
AVL Undervoltage Lockout Trip
Level
Falling 4.03
V
VL Output Voltage
6V ≤ V
IN
= V
INA
≤ 20V, 1mA ≤ I
VL
≤ 30mA,
T
A
= -40°C to +85°C
5.2 5.4 5.5 V
SOFT-START (SS)
SS Shutdown Resistance V
EN/SLOPE
= 0V (master mode) 20 100 Ω
SS Soft-Start Current V
SS
= 0.4V and 1.1V, T
A
= -40°C to +85°C 19 25 31 μA
PHASE COMPARATOR AND REFERENCE (PHASE/REFO)
Reference Output Voltage
Measured at PHASE/REFO (master mode),
T
A
= -40°C to +85°C
3.267 3.300 3.333 V
PHASE Comparator Offset
V
RS-
= V
AVL
(slave mode), V
PHASE
= 0.3V and 2.5V,
T
A
= -40°C to +85°C
-20 +20 mV
REFIN INPUT
REFIN Input Bias Current V
REFIN
= 0.7V or 3.3V -500 +500 nA
REFIN Input Voltage Range 0 3.3 V
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
.
MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
INA
= 12V, VL = AVL, V
REFIN
= 1V, V
RS+
- V
RS-
= 1V, V
RS-
= 0V, V
EN/SLOPE
= 1.25V, V
CS+
= V
CS-
= 1V, R
ILIM
= 122kΩ, C
VL
= 1μF,
C
AVL
= 0.22μF, C
FREQ
= 270pF, T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER
V
REFIN
= 3.3V 3.267 3.3 3.333
Remote-Sense Accuracy
(Including Error Amplifier Offset)
Measure as V
RS+
- V
RS-
(T
A
= -40°C to +85°C)
V
REFIN
= 0.7V 0.693 0.7 0.707
V
Transconductance T
A
= -40°C to +85°C 1.1 1.7 2.6 mS
COMP Source Current V
RS+
- V
RS-
= 1.3V 220 300 μA
COMP Sink Current V
RS+
- V
RS-
= 0.7V 220 300 μA
COMP Shutdown Resistance V
EN/SLOPE
= 0V 20 100 Ω
RS+/RS- Input Leakage Current 0.2 1.5 μA
RS+ Input Common-Mode Range V
IN
= V
INA
= V
VL
= V
AVL
= 4.5V, V
RS-
= 100mV 0 3.4 V
RS- Input Common-Mode Range -100 +100 mV
CURRENT-SENSE AMPLIFIER
Input Offset Voltage
Measure at CS+ and CS-, V
CS+
= V
CS-
= 0.7V and 5.5V
(T
A
= -40°C to +85°C)
-1.5 +1.5 mV
Current-Sense Amplifier Gain
V
CS-
= 0 to 5V, V
CS+
-
V
CS-
= 30mV,
T
A
= -40°C to +85°C
29.0 30.5 32.0 V/V
Input Bias Current V
CS+
= V
CS-
= 5.5V and 0V -4 +4 μA
CURRENT LIMIT
ILIM Output Current V
ILIM
= 2V, T
A
= -40°C to +85°C 9 10 11 μA
R
ILIM
= 122kΩ 16 20 23
Current-Limit Threshold
Measure as V
CS+
- V
CS-
(T
A
= -40°C to +85°C)
R
ILIM
= 275kΩ 38 45 52
mV
COMP Clamp Voltage High R
ILIM
= 275kΩ, V
REFIN
= 3.3V, V
RS+
- V
RS-
= 2V 3.6 3.8 4.0 V
COMP Clamp Voltage Low V
REFIN
= 3.3V, V
RS+
- V
RS-
= 3.35V 0.54 0.6 0.66 V
Maximum Peak Positive Current
Threshold
R
ILIM
= 275kΩ, no slope compensation 54 mV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

MAX8686ETL+T

Mfr. #:
Buy MAX8686ETL+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators Multiphase Step-Down DC/DC Converter
Lifecycle:
New from this manufacturer.
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