MAX1970EEE datasheet(4/20 Pages) MAXIM

4 / 20 page

Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-

Down Regulator with POR and RSI/PFO

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VCC = VEN = 5V, R POR = 100k

Ω to IN, RPFO = 100kΩ to IN, VRSI = 0, CREF = 0.1µF, FBSEL1 = unconnected, FBSEL2 =

unconnected, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PFO (MAX1970 and MAX1972 Only)

VCC rising

4.04

4.12

PFO Trip Threshold

IN = VCC

VCC falling

3.86

3.94

PFO Output Current, High

PFO = IN

-1

µA

PFO Output Voltage, Low

IPFO = 1mA, VIN = 4.3V

0.01

0.05

EN AND RSI (MAX1971 Only)

VIL

0.4

0.95

Logic Input Thresholds

IN = 2.6V to 5.5V

VIH

1.0

1.6

RSI Input Resistance

Internal pullup resistor to IN

Ω

VIL

-1

EN Logic Input Current

Logic input at 0 or

5.5V, VIN = 5.5V

VIH

-1

µA

ELECTRICAL CHARACTERISTICS

(VIN = VCC = VEN = 5V, VFB1 = VFB2 = 1.15V, R POR = 100k

Ω to IN, RPFO = 100kΩ to IN, RSI = 0, CVCC = 0.1µF, CREF = 0.1µF,

FBSEL1 = unconnected, FBSEL2 = unconnected, TA = -40°C to +85°C.) (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IN AND VCC

IN Voltage Range

2.6

5.5

MAX1971

IN Supply Current

Switching with no load

VIN = 3.3V

MAX1970/MAX1972

IN Shutdown Current

VIN = 5.5V, VEN = 0

MAX1971

100

µA

VCC rising

2.55

VCC Undervoltage

Lockout Threshold

VCC falling

2.20

REF

REF Voltage

IREF = 0, VIN = 2.6V to 5.5V

1.185

1.212

REF Shutdown Resistance

REF to GND, VEN=0

Ω

REF Soft-Start Current

VREF = 1V

µA

FB1 AND FB2

FB_ Regulation Voltage

FBSEL_ = unconnected, OUT1 = FB1, OUT2 = FB2,

VCOMP_ = 1.20V to 1.80V, VIN = 2.6V to 5.5V

1.185

1.212

OUT_ Voltage Range

FBSEL_ = unconnected

1.2

VIN

VIN = 2.6V to 5.5V

VCOMP1 = 1.2V, FBSEL1= GND

1.778

1.818

OUT1 Regulation Voltage

VIN = 4.5V to 5.5V

VCOMP1 = 1.2V, FBSEL1 = VCC

3.259

3.333

VCOMP2 = 1.2V, FBSEL2 = GND

1.481

1.515

OUT2 Regulation Voltage

VIN = 2.6V to 5.5V

VCOMP2 = 1.2V, FBSEL2 = VCC

2.469

2.525

Maximum Output Current

Guaranteed by design (Note 1)

750

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