MAX5083 datasheet(2/18 Pages) MAXIM

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1.5A, 40V, MAXPower Step-Down

DC-DC Converters

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ABSOLUTE MAXIMUM RATINGS

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, ON/OFF to SGND..............................................-0.3V to +45V

LX to SGND .................................................-0.3V to (VIN + 0.3V)

BST to SGND ................................................-0.3V to (VIN + 12V)

BST to LX................................................................-0.3V to +12V

PGND to SGND .....................................................-0.3V to +0.3V

REG, DVREG, SYNC to SGND ...............................-0.3V to +12V

FB, COMP, SS to SGND ...........................-0.3V to (VREG + 0.3V)

C+ to PGND (MAX5082 only)................(VDVREG - 0.3V) to +12V

C- to PGND (MAX5082 only) ................-0.3V to (VDVREG + 0.3V)

Continuous current through internal power MOSFET (pins 11/12

connected together and pins 13/14 connected together)

TJ = +125°C.........................................................................3A

TJ = +150°C.........................................................................2A

Continuous Power Dissipation* (TA = +70°C)

16-Pin TQFN (derate 33.3mW/°C above +70°C) ...2666.7mW

16-Pin TQFN (

θJA)........................................................30°C/W

16-Pin TQFN (

θJC).......................................................1.7°C/W

Operating Temperature Range .........................-40oC to +125°C

Maximum Junction Temperature .....................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VIN = VON/OFF = 12V, VREG = VDVREG, VSYNC = PGND = SGND, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values

are at TA = + 25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAX5082

4.5

Input Voltage Range

VIN

MAX5083

7.5

VIN rising, MAX5082

3.9

4.2

Undervoltage Lockout Threshold

UVLO

VIN rising, MAX5083

6.8

7.3

MAX5082

0.4

Undervoltage Lockout Hysteresis

UVLOHYST

MAX5083

0.7

VFB = 0V, MAX5082

10.5

Switching Supply Current (PWM

Operation)

ISW

VFB = 0V, MAX5083

9.5

VIN = 12V, VOUT = 3.3V, IOUT = 1.5A

Efficiency

VIN = 4.5V, VOUT = 3.3V, IOUT = 1.5A

(MAX5082)

MAX5082

1.4

2.5

No-Load Supply Current

(PFM Operation)

MAX5083

1.3

2.3

Shutdown Current

ISHDN

VON/OFF = 0V, VIN = 40V

200

300

µA

ON/

OFF CONTROL

Input Voltage Threshold

VON/OFF

VON/OFF rising

1.20

1.23

1.25

Input Voltage Hysteresis

0.12

Input Bias Current

VON/OFF = 0 to 40V

-250

+250

ERROR AMPLIFIER/SOFT-START

Soft-Start Current

ISS

815

µA

Reference Voltage (Soft-Start)

VSS

1.215

1.228

1.240

FB Regulation Voltage

VFB

ICOMP = -500µA to +500µA

1.215

1.228

1.240

FB Input Range

1.5

FB Input Current

-250

+250

COMP Voltage Range

ICOMP = -500µA to +500µA

0.25

4.50

Open-Loop Gain

Unity-Gain Bandwidth

1.8

MHz

FB Offset Voltage

ICOMP = -500µA to +500µA

-5

*As per JEDEC 51 Standard.

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