MP4458 – 1A, 4MHz, 36V STEP-DOWN CONVERTER

MP4458 Rev. 1.02

www.MonolithicPower.com

3

3/4/2013

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ELECTRICAL CHARACTERISTICS

Parameter

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

0.776

0.8

0.824

V

Upper Switch On Resistance

300

mΩ

Upper Switch Leakage

1

μA

Current Limit

Duty Cycle = 50%

1.4

1.8

2.2

A

COMP to Current Sense

Transconductance

3.1

A/V

Error Amp Voltage Gain

(5)

200

V/V

Error Amp Transconductance

40

60

80

µA/V

Error Amp Min Source current

5

µA

Error Amp Min Sink current

–5

µA

VIN UVLO Threshold

2.7

3.0

3.3

V

VIN UVLO Hysteresis

0.35

V

Soft-Start Time

(5)

1.5

ms

1.6

2

2.4

MHz

Oscillator Frequency

3.2

4

4.8

MHz

Shutdown Supply Current

12

18

µA

Quiescent Supply Current

120

145

µA

Thermal Shutdown

150

°C

Thermal Shutdown Hysteresis

15

°C

Minimum Off Time

100

ns

Minimum On Time

(5)

100

ns

EN Up Threshold

1.35

1.5

1.65

V

EN Down Threshold

1.15

1.2

1.25

V

5) Guaranteed by design.