MAX8540EEE datasheet(2/16 Pages) MAXIM

2 / 16 page

Synchronizable, High-Frequency Current- and

Voltage-Mode PWM Controllers for Isolated Supplies

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VVCC = 12V, CREF = 1µF, VUV = VOV = VOPTO, VILIM = 2V, RFREQ/SYNC = 32.4k

Ω, CSS = 0.1µF, RMAXDTY = 97.6kΩ, VEN = 0,

RSCOMP = 68k

Ω, RPRAMP = 25kΩ, CSKTON = 0.01µF, CSKTOFF = 0.1µF, VCS = 0.6V, CDRV = 10pF, TA = 0°C to +85°C, unless otherwise

noted. Typical values are at TA = +25°C.)

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.

VCC to GND ............................................................-0.3V to +20V

OPTO, UV, OV, EN, PRAMP, ILIM, REF to GND ......-0.3V to +6V

SCOMP, FREQ, CS, SKTON, SKTOFF, SS,

MAXDTY to GND .....................................-0.3V to VREF + 0.3V

DRV to GND ................................................-0.3V to VVCC + 0.3V

Continuous Power Dissipation (TA = +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC

Operating Voltage Range

(Note 1)

7.6

18.0

VCC rising

7.6

8.0

8.4

Undervoltage Lockout

VCC falling

6.6

7.0

7.4

Undervoltage Lockout Hysteresis

0.9

1.0

No switching

3.5

4.2

Supply Current

VREF is active,

IREF = 0

Switching with no load

6.3

Shutdown Current

V EN = 3V

0.5

0.9

REF

Output Voltage

IREF = 0

4.9

5.0

5.1

Load Regulation

IREF = 0 to 10 mA

Line Regulation

VVCC = 8.4V to 18V

Pulldown Resistor in Shutdown

V EN = 3V

Ω

UNDERVOLTAGE/OVERVOLTAGE (UV/OV)

VUV rising, 120mV typical hysteresis

1.200

1.250

1.300

UVLO Threshold

VUV falling

1.083

1.128

1.173

Input Bias Current

-0.5

+0.01

+0.5

µA

VOV rising, 130mV typical hysteresis

2.9

3.021

3.1

OVLO Threshold

VOV falling

2.778

2.894

3.010

Input Low Threshold

VIL

1.2

Input High Threshold

VIH

2.6

Pullup Current

V EN = 2.6V

µA

CURRENT LIMIT

VILIM Range

0.075

1.250

CS Current-Limit to DRV Turn-Off

Delay

Includes leading-edge blanking time

110

150

Accuracy when VILIM = 0.075V

±10

VCS Cycle-by-Cycle Threshold

Voltage

VILIM = 1.250V

1.175

1.250

1.330

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