MAX8686 datasheet(2/23 Pages) MAXIM

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Single/Multiphase, Step-Down,

DC-DC Converter Delivers Up to 25A Per Phase

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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)

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 (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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL

Operating Input-Voltage Range

VINA = VIN , TA = -40°C to +85°C

Operating Input-Voltage Range

VIN = VINA = VVL = VAVL, TA = -40°C to +85°C

4.5

5.5

TA = +25°C

450

IN/INA Shutdown Supply Current

VEN/SLOPE = 0V,

VIN = VINA = 20V

TA = +85°C

500

μA

IN/INA Quiescent Supply Current

VRS+ = 1.1V, no switching; VIN = VINA = 20V,

TA = -40°C to +85°C

5.5

6.6

Rising, TA = -40°C to +85°C

4.2

4.35

4.45

AVL Undervoltage Lockout Trip

Level

Falling

4.03

VL Output Voltage

≤ VIN = VINA ≤ 20V, 1mA ≤ IVL ≤ 30mA,

TA = -40°C to +85°C

5.2

5.4

5.5

SOFT-START (SS)

SS Shutdown Resistance

VEN/SLOPE = 0V (master mode)

100

SS Soft-Start Current

VSS = 0.4V and 1.1V, TA = -40°C to +85°C

μA

PHASE COMPARATOR AND REFERENCE (PHASE/REFO)

Reference Output Voltage

Measured at PHASE/REFO (master mode),

TA = -40°C to +85°C

3.267

3.300

3.333

PHASE Comparator Offset

VRS- = VAVL (slave mode), VPHASE = 0.3V and 2.5V,

TA = -40°C to +85°C

-20

+20

REFIN INPUT

REFIN Input Bias Current

VREFIN = 0.7V or 3.3V

-500

+500

REFIN Input Voltage Range

3.3

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.

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