Rainbow-electronics MAX15023 Manual de usuario descargar pdf (Pagina 3)

MAX15023

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 I

COMP_

| I

COMP_

|, V

COMP_

= 1.5V 45 80 120 µA

ENABLE (EN_)

EN_ Input High V

EN_H

EN_

rising 1.15 1.20 1.25 V

EN_ Input Hysteresis V

EN_HYS

150 mV

EN_ Input Leakage Current I

LEAK_EN_

-250 +250 nA

OSCILLATOR

Switching Frequency f

Each converter 460 500 540 kHz

Switching Frequency

Adjustment Range

(Note 4) 200 1000 kHz

PWM Ramp Peak-to-Peak

Amplitude

RAMP

1.42 V

PWM Ramp Valley V

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

Low, sinking 100mA, V

BST_

- V

LX_

= 5V 1

DH_ On-Resistance

H i g h, sour ci ng 100m A, V

B S T _

- V

L X _

= 5V 1.2

Ω

Low, sinking 100mA, V

= 5.2V 0.75

DL_ On-Resistance

High, sourcing 100mA, V

= 5.2V 1.4

Ω

Sinking 3

DH_ Peak Current C

LOAD

= 10nF

Sourcing 2

Sinking 3

DL_ Peak Current C

LOAD

= 10nF

Sourcing 2

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)

= 12V, R

= 33kΩ, C

VCC

= 4.7µF, C

= 1µF, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

(Note 3)

1 2 3 4 5 6 7 8 ... 26 27

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Rainbow-electronics MAX15023 Manual de usuario Pagina 3

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