MAX1970EEE(2002) 查看數據表（PDF） - Maxim Integrated

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MAX1970EEE
(Rev.:2002)

Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-Down Regulator with POR and RSI/PFO

Maxim Integrated 

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 = 100kΩ 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

PFO (MAX1970 and MAX1972 Only)

CONDITIONS

MIN

TYP MAX UNITS

PFO Trip Threshold

IN = VCC

VCC rising

VCC falling

PFO Output Current, High PFO = IN

PFO Output Voltage, Low IPFO = 1mA, VIN = 4.3V

EN AND RSI (MAX1971 Only)

Logic Input Thresholds

IN = 2.6V to 5.5V

VIL

VIH

RSI Input Resistance

Internal pullup resistor to IN

EN Logic Input Current

Logic input at 0 or

VIL

5.5V, VIN = 5.5V

VIH

4.04

4.12

V

3.86

3.94

-1

1

µA

0.01

0.05

V

0.4

0.95

V

1.0

1.6

5

10

20

kΩ

-1

1

µA

-1

1

ELECTRICAL CHARACTERISTICS

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

IN Supply Current

IN Shutdown Current

VCC Undervoltage

Lockout Threshold

REF

REF Voltage

REF Shutdown Resistance

REF Soft-Start Current

FB1 AND FB2

Switching with no load

VIN = 3.3V

VIN = 5.5V, VEN = 0

VCC rising

VCC falling

MAX1971

MAX1970/MAX1972

MAX1970/MAX1972

MAX1971

IREF = 0, VIN = 2.6V to 5.5V

REF to GND, VEN=0

VREF = 1V

2.6

2.20

1.185

20

5.5

V

10

mA

20

20

µA

100

2.55

V

1.212

V

25

Ω

30

µA

FB_ Regulation Voltage

OUT_ Voltage Range

OUT1 Regulation Voltage

OUT2 Regulation Voltage

Maximum Output Current

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

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

FBSEL_ = unconnected

VIN = 2.6V to 5.5V

VCOMP1 = 1.2V, FBSEL1= GND

VIN = 4.5V to 5.5V

VCOMP1 = 1.2V, FBSEL1 = VCC

VIN = 2.6V to 5.5V

VCOMP2 = 1.2V, FBSEL2 = GND

VCOMP2 = 1.2V, FBSEL2 = VCC

Guaranteed by design (Note 1)

1.185

1.2

1.778

3.259

1.481

2.469

750

1.212

V

VIN

V

1.818

V

3.333

1.515

V

2.525

mA

4 _______________________________________________________________________________________

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