MAX17681 datasheet(4/19 Pages) MAXIM

4 / 19 page

(VIN = 24V, VGND = VPGND = 0V, CVIN = 2.2μF, CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, COMP = unconnected,

LX = unconnected, RESET = unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All

voltages are referenced to GND, unless otherwise noted.) (Note 2)

Note 2: All limits are 100% tested at +25°C. Limits over temperature are guaranteed by design.

Note 3: Guaranteed by design, not production tested.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Peak Current-Limit Threshold

IPEAK-LIMIT

1.4

1.65

1.9

Runaway Current-Limit

Threshold

IRUNAWAY-

LIMIT

1.45

1.7

Sink Current-Limit Threshold

ISINK-LIMIT

1.05

1.25

1.45

TIMINGS

Switching Frequency

fSW

186

200

213

kHz

Events to Hiccup After Crossing

Runaway Current Limit

VOUT Undervoltage Trip Level

to Cause Hiccup

VOUT-HICF

VSS > 0.95V (soft-start is done)

67.86

70.5

73.14

Hiccup Timeout

32768

Cycles

Minimum On-Time

tON_MIN

200

300

415

Maximum Duty Cycle

DMAX

VFB = 0.98 x VFB-REG

96.5

97.5

98.5

LX Dead Time

RESET

Output Level Low

IRESET = 1mA

0.02

RESET

Output Leakage Current

High

VFB = 1.01 x VFB-REG,

TA= 25°C

0.45

μA

FB Threshold for RESET Falling

VFB-OKF

VFB falling

90.5

92.5

94.5

FB Threshold for RESET Rising

VFB-OKR

VFB rising

93.5

95.5

97.5

RESET

Delay After FB Reaches

95% Regulation

VFB rising

1024

Cycles

THERMAL SHUTDOWN

Thermal Shutdown Threshold

Temperature rising

165

°C

Thermal Shutdown Hysteresis

°C

Electrical Characteristics (continued)

MAX17681

4.5V to 42V Input, High-Efficiency,

Iso-Buck DC-DC Converter

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