MAX1970EEE datasheet(2/20 Pages) MAXIM

2 / 20 page

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

Down Regulator with POR and RSI/PFO

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

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

ELECTRICAL CHARACTERISTICS

(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

IN AND VCC

IN Voltage Range

2.6

5.5

MAX1971

IN Supply Current

Switching with no load

VIN = 3.3V

MAX1970/MAX1972

100

IN Shutdown Current

VIN = 5.5V, VEN = 0

MAX1971

µA

VCC rising

2.40

2.55

VCC Undervoltage

Lockout Threshold

VCC falling

2.20

2.35

REF

REF Voltage

IREF = 0, VIN = 2.6V to 5.5V

1.188

1.200

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

1.188

1.200

1.212

OUT_ Voltage Range

FBSEL_ = unconnected

1.2

VIN

VIN = 2.6V to 5.5V

VCOMP1 = 1.2V, FBSEL1= GND

1.782

1.800

1.818

OUT1 Regulation Voltage

VIN = 4.5V to 5.5V

VCOMP1 = 1.2V, FBSEL1 = VCC

3.2670

3.3

3.330

VCOMP2 = 1.2V, FBSEL2 = GND

1.485

1.5

1.150

OUT2 Regulation Voltage

VIN = 2.6V to 5.5V

VCOMP2 = 1.2V, FBSEL2 = VCC

2.475

2.5

2.525

Maximum Output Current

Guaranteed by design (Note 1)

750

FBSEL1 = GND

120

FB1 Input Resistance

Measured from FB1 to

GND

FBSEL1 = VCC

120

Ω

FBSEL2 = GND

22.5

FB2 Input Resistance

Measured from FB2 to

GND

FBSEL2 = VCC

22.5

Ω

FB_ Input Bias Current

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

0.01

0.1

µA

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