MP9943 – 36V, 3A PEAK SYNCHRONOUS STEP-DOWN CONVERTER

MP9943 Rev.1.1

www.MonolithicPower.com

4

7/4/2017

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© 2017 MPS. All Rights Reserved.

ELECTRICAL CHARACTERISTICS

Parameter

Symbol

Condition

Min

Typ

Max

Units

Supply Current (Shutdown)

8

μA

Supply Current (Quiescent)

0.5

0.7

mA

HS Switch-ON Resistance

85

105

mΩ

LS Switch-ON Resistance

55

75

mΩ

Switch Leakage

1

μA

Current Limit

Under 40% Duty Cycle

3.2

4.4

5.5

A

Oscillator Frequency

320

410

500

kHz

Fold-Back Frequency

70

100

130

kHz

Maximum Duty Cycle

92

95

%

Minimum ON Time

(6)

70

ns

Sync Frequency Range

0.2

2.4

MHz

Feedback Voltage

778

792

806

mV

Feedback Current

10

100

nA

EN Rising Threshold

1.15

1.4

1.65

V

EN Falling Threshold

1.05

1.25

1.45

V

EN Threshold Hysteresis

150

mV

EN Input Current

4

6

μA

0

0.2

μA

VIN Under-Voltage Lockout

Threshold-Rising

3.3

3.5

3.7

V

VIN Under-Voltage Lockout

Threshold-Falling

3.1

3.3

3.5

V

VIN Under-Voltage Lockout

Threshold-Hysteresis

200

mV

VCC Regulator

4.6

4.9

5.2

V

VCC Load Regulation

1.5

4

%

Soft-Start Period

0.45

1. 5

2.55

ms

Thermal Shutdown

(6)

150

170

°C

Thermal Hysteresis

(6)

30

°C

PG Rising Threshold

86

90

94

%

PG Falling Threshold

80

84

88

%