MAX1945R Просмотр технического описания (PDF) - Maxim Integrated

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MAX1945R

1MHz, 1% Accurate, 6A Internal Switch Step-Down Regulators

Maxim Integrated 

1MHz, 1% Accurate, 6A Internal Switch

Step-Down Regulators

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VCC = VCTL1 = VCTL2 = VDD = 3.3V, SYNC = GND, FBSEL = High-Z, VFB = 0.7V, CREF = 0.22µF, TA = -40°C to +85°C, unless

otherwise noted.) (Note 2)

PARAMETER

LX Minimum Duty Cycle

FBSEL

SYMBOL

CONDITIONS

SYNC = GND,

VIN = 2.6V/3.3V

MIN TYP MAX UNITS

10.5

%

FBSEL Input Threshold 1.8V

FBSEL Input Threshold 2.5V

FBSEL Input Current Low

FBSEL Input Current High

CTL1/CTL2

CTL1/CTL2 Input Threshold

CTL1/CTL2 Input Current

Soft-Start Period

SYNC

SYNC Capture Range

SYNC Pulse Width

SYNC Input Threshold

SYNC Input Current

SYNCOUT

SYNCOUT Frequency Range

SYNCOUT Output Voltage

ILOW_

FBSEL

IHIGH_

FBSEL

Where 1.8V feedback

switches in and out,

VCC = 2.6V/3.3V/5.5V

Where 2.5V feedback

switches in and out,

VCC = 2.6V/3.3V/5.5V

FBSEL = GND

FBSEL = VCC

FBSEL rising

FBSEL falling 0.08

FBSEL rising

FBSEL falling

VCC -

0.22

-50

VIL_CTL_

VIH_CTL_

VIN = 2.6V to 5.5V

0.4

IIL_CTL_ VCTL1 or VCTL2 = 0 or 5.5V, VIN = 5.5V

-1

IIH_CTL_

-1

Time required for output to ramp up

2.9

VIN = 2.6V to 5.5V

0.4

VIN = 2.6V to 5.5V

250

VIL_SYNC VIN = 2.6V to 5.5V

0.4

VIH_SYNC

IIL, IIH VSYNC = 0 or 5.5V, VIN = 5.5V

-1

fSYNCOUT

VOH_

SYNCOUT

VOL_

SYNCOUT

VCC = 2.6V to 5.5V

ISYNCOUT = ±1mA, VCC = 2.6V to 5.5V

0.4

VCC -

0.4

0.22

V

VCC -

0.08

V

µA

50

µA

V

1.6

+1

µA

+1

4.5

ms

1.2

MHz

ns

V

1.6

+1

µA

1.2

MHz

V

0.4

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

Note 3: When connected together, the LX output is designed to provide 6A RMS current.

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