MP4558

– 1A, 2MHz, 55V STEP-DOWN CONVERTER

MP4558 Rev. 1.01

www.MonolithicPower.com

3

10/28/2013

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ELECTRICAL CHARACTERISTICS

otherwise noted.

Parameter

Symbol Condition

Min

Typ

Max

Units

Feedback Voltage

0.780

0.800

0.820

V

0.772

0.829

Feedback Leakage Current

0.1

1.0

μA

Upper Switch On Resistance

(5)

175

250

330

mΩ

160

400

Upper Switch Leakage

1

μA

Current Limit

Duty cycle

≤60%

1.3

1.9

3.5

A

1.1

3.7

COMP to Current Sense

Transconductance

5.7

A/V

Error Amp Voltage Gain

400

V/V

Error Amp Transconductance

120

µA/V

Error Amp Min Source current

10

µA

Error Amp Min Sink current

-10

µA

VIN UVLO Threshold

2.7

3.0

3.3

V

2.4

3.6

VIN UVLO Hysteresis

0.35

V

Soft-Start Time

(5)

0.5

ms

Oscillator Frequency

0.8

1

1.2

MHz

0.7

1.3

Shutdown Supply Current

12

20

µA

Quiescent Supply Current

140

200

µA

Thermal Shutdown

Hysteresis = 20°C

150

°C

Minimum Off Time

100

ns

Minimum On Time

(5)

100

ns

EN Rising Threshold

1.4

1.55

1.7

V

1.3

1.8

EN Threshold Hysteresis

320

mV

Notes:

5) Derived from bench characterization. Not tested in production..