Wide 4.5V to 28V Input, Dual-Output

Synchronous Buck Controller

_______________________________________________________________________________________

3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

COMP_ Swing (High)

2.4

V

COMP_ Swing (Low)

No load at COMP_

0.6

V

COMP_ Source/Sink Current

45

80

120

μA

ENABLE (EN_)

EN_ Input High

EN_ rising

1.15

1.20

1.25

V

EN_ Input Hysteresis

150

mV

EN_ Input Leakage Current

-250

+250

nA

OSCILLATOR

Switching Frequency

Each converter

460

500

540

kHz

Switching Frequency

Adjustment Range

(Note 4)

200

1000

kHz

PWM Ramp Peak-to-Peak

Amplitude

1.42

V

PWM Ramp Valley

0.72

V

Phase Shift Between

Channels

From DH1 to DH2 rising edges

180

Degrees

Minimum Controllable On-Time

60

100

ns

Maximum Duty Cycle

86

87.5

%

OUTPUT DRIVERS

1

DH_ On-Resistance

1.2

Ω

0.75

DL_ On-Resistance

1.4

Ω

Sinking

3

DH_ Peak Current

Sourcing

2

A

Sinking

3

DL_ Peak Current

Sourcing

2

A

DH_, DL_ Break-Before-Make

Time (Dead Time)

15

ns

SOFT-START

Soft-Start Duration

2048

Switching

cycles

Reference Voltage Steps

64

Steps

ELECTRICAL CHARACTERISTICS (continued)

(Note 3)