MAX1973 datasheet(3/15 Pages) MAXIM

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Smallest 1A, 1.4MHz Step-Down Regulators

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VCTL_ = 3.3V, FB = OUT, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SS Source Current

-25

-20

-15

µA

SS Sink Current

µA

SS to GND Resistance in

Shutdown

540

100

Ω

FBSEL

Low Input Threshold

0.3

High Input Threshold

VIN -

0.3

Input Bias Current

FBSEL = GND or IN, VIN = 5.5V

-20

+20

µA

COMP

Transconductance from FB to

COMP

µS

COMP to GND Resistance in

Shutdown

540

100

Ω

Clamp Voltage Low

0.6

0.9

1.2

Clamp Voltage High

1.35

1.75

2.15

On-Resistance High

VIN = 3.3V

0.23

0.46

Ω

On-Resistance Low

VIN = 3.3V

0.16

0.32

Ω

Current-Sense Transresistance

0.275

0.335

0.425

V/A

Positive Current-Limit Threshold

1.1

1.6

1.75

Negative Current-Limit Threshold

-1.2

-0.8

-0.4

VLX = VIN = 5.5V

LX Shutdown Leakage Current

LX = GND, VIN = 5.5V

-20

µA

Switching Frequency

1.2

1.4

1.6

MHz

CTL1, CTL2 (MAX1973), ON (MAX1974)

Logic-Low Input Threshold

0.6

Logic-High Input Threshold

1.6

Logic Input Current

-1

µA

POK (MAX1974 only)

Output Low Voltage

POK sinking 1mA

100

Rising

92.5

Output Valid Threshold for POK

Percentage of nominal

regulation voltage

Falling

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