NB669, 24V, HIGH CURRENT SYNCHRONOUS BUCK CONVERTER WITH LDO

NB669 Rev. 1.01

www.MonolithicPower.com

3

7/23/2013

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ELECTRICAL CHARACTERISTICS

Parameters

Symbol

Condition

Min

Typ

Max

Units

Supply Current

Supply Current (Shutdown)

1

2

μA

Supply Current (Quiescent)

140

220

300

μA

Supply Current (No Load)

240

μA

Supply Current (Standby)

40

80

120

μA

MOSFET

High-side Switch On Resistance

30

mΩ

Low-side Switch On Resistance

15

mΩ

Switch Leakage

0

1

μA

Current Limit

Low-side Valley Current Limit

8

8.5

9.5

A

Switching frequency and minimum off timer

Switching Frequency

400

500

600

kHz

Minimum Off Time

(6)

350

ns

Over-voltage and Under-voltage Protection

OVP Threshold

125

130

135

%

OVP Delay

(6)

2.5

μs

UVP Threshold

55

60

65

%

UVP Delay

(6)

8

μs

4.95

5.05

5.15

V

Soft Start Time

1.5

1.8

1.95

ms

Enable And UVLO

Enable Input Low Voltage

1.15

1.25

1.35

V

Enable Hysteresis

100

mV

5

Enable Input Current

0

μA

Enable LDO Input Low Voltage

1.15

1.25

1.35

V

Enable LDO Hysteresis

100

mV