MAX1971EEE datasheet(3/21 Pages) MAXIM

Part #	MAX1971EEE

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

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Manufacturer	MAXIM [Maxim Integrated Products]

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

Down Regulator with POR and RSI/PFO

_______________________________________________________________________________________

3

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

CONDITIONS

MIN

TYP

MAX

UNITS

COMP1 AND COMP2

COMP1

Transconductance

FB1 = COMP1,

VCOMP1 = 1.2V

FBSEL1 = unconnected

35

55

85

µS

COMP2

Transconductance

FB2 = COMP2,

VCOMP2 = 1.2V

FBSEL2 = unconnected

35

55

85

µS

LX1 AND LX2

VIN = 5.0V

0.20

0.32

VIN = 3.3V

0.24

0.37

Internal High-Side

MOSFET On-Resistance

ILX = -180mA

VIN =2.6V

0.28

Ω

VIN = 5.0V

0.12

0.23

VIN = 3.3V

0.14

0.25

Internal Low-Side

MOSFET On-Resistance

ILX = 180mA

VIN = 2.6V

0.16

Ω

LX_ Current-Sense

Transresistance

0.4

0.5

0.6

V/A

High side

0.80

1.2

1.60

LX_ Current-Limit

Threshold

Duty Cycle = 100%,

VIN = 2.6V to 5.5V

Low side

-1.6

-0.85

-0.40

A

VLX1 = VLX2 = 5.5V

20

LX_ Leakage Current

VIN = 5.5V

VLX1 = VLX2 = 0

-20

µA

MAX1970/MAX1972

1.2

1.4

1.6

LX_ Switching Frequency

VIN = 2.6V to 5.5V

MAX1971

0.60

0.70

0.80

MHz

LX_ Maximum Duty Cycle

100

%

MAX1970/MAX1972

15

20

LX_ Minimum Duty Cycle

VIN = 2.6V to 5.5V

MAX1971

10

15

%

POR

VOUT rising

92

94

POR Thresholds

Percentage of VOUT,

VIN = 2.6V to 5.5V

VOUT falling

87

90

%

MAX1970

13.3

16.6

20

POR Delay Time (TD)

MAX1971/MAX1972

140

175

210

ms

POR Output Current, High

VPOR = VIN = 5.5V, VFB1 = VFB2 = 1.15V

-1

1

µA

POR Output Voltage, Low

VFB1 = 1.05V or VFB2 = 1.05V or RSI = IN (MAX1971 only),

I POR = 1mA

0.01

0.05

V

POR Startup Voltage

FB1 = FB2 = GND, IPOR = 100µA, VIN = 1.2V

0.01

0.05

V

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