NB621 – 8A, 25V, 600kHz SYNCHRONOUS STEP-DOWN CONVERTER WITH INTEGRATED LDO

NB621 Rev. 0.9

www.MonolithicPower.com

4

12/10/2013

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Parameters

Symbol

Condition

Min

Typ

Max

Units

LDD Switch On Resistance

(5)

5

Ω

4.8

5

5.2

V

4.75

5

5.25

V

4.75

5

5.25

V

3.2

3.33

3.46

V

3.13

3.33

3.5

V

LDO Output Voltage

3.13

3.33

3.5

V

SELH=0V

100

mA

LDO Output Current

SELH=5V

100

mA

SELH=0V

4.55

4.7

4.85

V

Switch Over Threshold (Rising)

SELH=5V

3.05

3.15

3.25

V

SELH=0V

0.15

0.25

0.3

V

Switch Over Hysteresis

SELH=5V

0.1

0.2

0.25

V

SELH Input Low Voltage

0.4

V

SELH Input High Voltage

2.5

V

ENLDO

Input

Low

Voltage

0.4

V

ENLDO Input High

Voltage

2

V

Thermal Shutdown

150

°C

Note:

5) Guaranteed by design.

6) TSS—Soft startup time