HM2459B datasheet(4/13 Pages) HMSEMI

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Electrical Characteristics

Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the full Operating

Temperature Range ( TJ = −40°C to +125°C). Minimum and Maximum limits are guaranteed through test, design, or

statistical correlation. Typical values represent the most likely parametric norm at TJ = +25°C, and are provided for

reference purposes only. Unless otherwise stated the following conditions apply: VIN = 12V.

Item

Symbol

Test condition

Min

Typ.

Max

Unit

Quiescent current

EN=0 V

0.7

μA

Device On, Not Switching

1.3

1.75

Device On, No Load

1.35

1.85

Switch ON resistance

RDSON

0.9

1.6

Switch leakage current

ILSW

VIN =40V

0.5

μA

Switch Current Limit

ICL

1.2

Feedback pin Bias Current

IFB

0.1

μA

Feedback voltage

VFB

0.788

0.8

0.812

Minimum ON time

tMIN

100

Switching Frequency

fSW

VFB=0.5V

550

KHz

Short Circuit Frequency

Fshort

VFB = 0V

140

KHz

Maximum Duty Cycle

DMAX

VFB = 1.0V

VIN UVLO Threshold

Vuvp

On threshold

4.4

3.9

Vuvhy

Off threshold

3.7

3.5

EN Shutdown Threshold

Voltage

VEN_ST

VEN Rising

Thermal Shutdown

160

°C

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