FC3470DFN22 datasheet(4/13 Pages) FS

4 / 13 page

Electrical Characteristics

(VIN=12V, VOUT=3.3V, TA = 25°C, unless otherwise noted.)

Parameter

Conditions

Min

Typ Max Unit

Input Voltage Range

4.5

OVP Threshold

19.3

UVLO Threshold

4.0

4.5

Supply Current in Operation

VEN=2.0V, VFB=1.1V

0.1

0.3

0.5

Supply Current in Shutdown

VEN =0

μA

Regulated Feedback Voltage

TA = 25°C, 4.5V≤ VIN ≤18V

0.588

0.6

0.612

High-side Switch On-Resistance

120

mΩ

Low-side Switch On-Resistance

mΩ

High-side Switch Leakage Current

VEN=0V, VLX=0V

μA

Switch Current Limit

Minimum Duty Cycle

Oscillation Frequency

VFB=0.6V

500

600

700

kHz

Maximum Duty Cycle

EN Input High Level Voltage

1.50

EN Input Low Level Voltage

0.40

Soft Start Time

0.6

Hiccup on Time

Hiccup Time Before Restart

Minimum On-Time

Thermal Shutdown Threshold (Note 4)

155

°C

Thermal Shutdown Hysteresis (Note 4)

°C

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be

impaired.

Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the

following formula: TJ = TA + PD x θJA. The maximum allowable continuous power dissipation at any

ambient temperature is calculated by PD (MAX) = (TJ(MAX)-TA)/θJA.

Note 3: Measured on JESD51-7, 4-layer PCB.

Note 4: Thermal shutdown threshold and hysteresis are guaranteed by design.

FC3470DFN22

2019. 11. 29

4/13

Revision No : 0

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