Active-Clamped, Spread-Spectrum,

Current-Mode PWM Controllers

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 to GND..............................................................-0.3V to +24V

RT, DT, FFB, COMP, SS, DCLMP, DITHER/SYNC

to GND .................................................................-0.3V to +6V

FB to GND (MAX5974A/MAX5974B only)..................-6V to +6V

FB to GND (MAX5974C/MAX5974D only) ..............-0.3V to +6V

CS, CSSC to GND...................................................-0.8V to +6V

PGND to GND ......................................................-0.3V to +0.3V

Maximum Input/Output Current (continuous)

NDRV, AUXDRV............................................................100mA

NDRV, AUXDRV (pulsed for less than 100ns).................. Q1A

16-Pin TQFN (derate 20.8mW/NC above +70NC).......1666mW

16-Pin TQFN...................................................................7NC/W

16-Pin TQFN.................................................................48NC/W

Operating Temperature Range.......................... -40NC to +85NC

Maximum Junction Temperature.....................................+150NC

Storage Temperature Range............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

ELECTRICAL_CHARACTERISTICS

ABSOLUTE_MAXIMUM_RATINGS

Note_1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

UNDERVOLTAGE_LOCKOUT/STARTUP_(IN)

Bootstrap UVLO Wakeup Level

MAX5974A/

MAX5974C

19.1

19.8

20.4

V

MAX5974B/

MAX5974D

9.4

9.8

10.25

Bootstrap UVLO Shutdown

Level

6.65

7

7.35

V

IN Supply Current in

Undervoltage Lockout

MAX5974C);

when in bootstrap UVLO

100

150

F

A

IN Supply Current After Startup

1.8

3

mA

ENABLE_(EN)

Enable Threshold

1.17

1.215

1.26

V

1.09

1.14

1.19

Input Current

1

F

A

OSCILLATOR_(RT)

RT Bias Voltage

1.23

V

NDRV Switching Frequency

Range

100

600

kHz

NDRV Switching Frequency

Accuracy

-8

+8

%

Maximum Duty Cycle

79

80

82

%