MAX25256 datasheet(4/16 Pages) MAXIM

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MAX25256

Automotive, 36V H-Bridge Transformer Driver for

Isolated Supplies

www.maximintegrated.com

Maxim Integrated | 4

(VDD = 8V to 36V, V = 0V, TA = -40°C to +125°C unless otherwise noted, Typical values are at TA = +25°C (Note 2))

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Leakage

Current

IIL

VCLK = V

= 5.5V or 0V

-1

µA

Output Logic-

Low Voltage

VOL

= 10mA

Leakage

Current

ILKGF

= 36V,

deasserted

µA

AC CHARACTERISTICS

Switching Frequency

fSW

VCLK = 0V, measured at ST1/ST2

outputs

255

700

kHz

CLK Input Frequency

fEXT

External clocking

200

2000

kHz

ST1/ST2 Duty Cycle

DTC

Internal or external clocking,

Fext<=1000kHz (Note 4)

External clocking, Fext>1000kHz

(Note 4)

ST1/ST2 Rise Time

tRISE

ST1/ ST2 = 20% to 80% of VDD, RL =

1kΩ,

CL = 50pF,

Figure 1A

100

ST1/ST2 Fall Time

tFALL

ST1/ST2 = 80% to 20% of VDD, RL =

1kΩ,

CL = 50pF,

Figure 1A

100

Crossover Dead Time

tDEAD

= 200Ω,

Figure 1B

Watchdog Timeout

tWDOG

(Note 5), VDD = 36V

µs

Current-Limit

Blanking Time

tBLANK

Figure 2, V

DD = 36V

0.73

1.2

2.0

Current-Limit

Autoretry Time

tRETRY

Figure 2, V

DD = 36V

23.4

38.4

64.0

PROTECTION

Thermal-Shutdown

Threshold

TSHDN

+160

°C

Thermal-Shutdown

Hysteresis

TSHDN_HYS

°C

Note 1:

Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage are

guaranteed by design and characterization. Typical values are at TA = +25°C.

Note 2:

If VDD is greater than 27V, see the Snubber section.

Note 3:

Guaranteed by design and simulation; not production tested.

Note 4:

See the

Watchdog section.

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