MAX1970 データシートの表示（PDF） - Maxim Integrated

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MAX1970

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

ABSOLUTE MAXIMUM RATINGS

IN, EN, FBSEL1, FBSEL2, PFO, POR,

RSI, VCC to GND ...................................................-0.3V to +6V

COMP1, COMP2, FB1, FB2,

REF to GND .............................................-0.3V to (VCC + 0.3V)

LX1, LX2 to PGND .......................................-0.3V to (VIN + 0.3V)

PGND to GND .......................................................-0.3V to +0.3V

Continuous Power Dissipation (TA = +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(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

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

CONDITIONS

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

MIN

TYP MAX UNITS

2.6

5.5

V

5

10

mA

10

20

1

100

µA

1

60

2.40

2.55

V

2.20

2.35

1.188 1.200 1.212

V

10

25

Ω

20

25

30

µA

FB_ Regulation Voltage

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

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

1.188 1.200 1.212

V

OUT_ Voltage Range

FBSEL_ = unconnected

1.2

VIN

V

OUT1 Regulation Voltage

VIN = 2.6V to 5.5V

VIN = 4.5V to 5.5V

VCOMP1 = 1.2V, FBSEL1= GND 1.782 1.800 1.818

V

VCOMP1 = 1.2V, FBSEL1 = VCC 3.2670

3.3

3.330

OUT2 Regulation Voltage VIN = 2.6V to 5.5V

VCOMP2 = 1.2V, FBSEL2 = GND 1.485

1.5

1.150

V

VCOMP2 = 1.2V, FBSEL2 = VCC

2.475

2.5

2.525

Maximum Output Current Guaranteed by design (Note 1)

750

mA

FB1 Input Resistance

FB2 Input Resistance

Measured from FB1 to

GND

Measured from FB2 to

GND

FBSEL1 = GND

FBSEL1 = VCC

FBSEL2 = GND

FBSEL2 = VCC

30

60

120

kΩ

30

60

120

22.5

45

22.5

45

90

kΩ

90

FB_ Input Bias Current

FB1 or FB2, FBSEL_ = unconnected, VFB1 = VFB2 = 1.15V

0.01

0.1

µA

2 _______________________________________________________________________________________

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