MAX640 datasheet(5/12 Pages) MAXIM

5 / 12 page

5V/3.3V/3V/Adjustable, High-Efficiency,

Low IQ, Step-Down DC-DC Converters

_______________________________________________________________________________________

MAX639

START-UP TIME vs.

OUTPUT CURRENT

OUTPUT CURRENT (mA)

100

V+ = 5.5V

V+ = 9.0V

V+ = 11.5V

MEASURED FROM THE RISING EDGE

OF V+ OR SHDN TO (VOUT = 5V).

MAX640/MAX653

START-UP TIME vs.

OUTPUT CURRENT

OUTPUT CURRENT (mA)

100

V+ = 9.0V

V+ = 11.5V

V+ = 5.0V

MEASURED FROM THE RISING EDGE OF V+

OR SHDN TO (VOUT = 3.3V)(MAX640) OR

(VOUT = 3.0V)(MAX653). THE START-UP

TIME DIFFERENCE BETWEEN THE

MAX640 AND THE MAX653

IS NEGLIGIBLE.

L = 100

µH

MAX639

START-UP TIME vs.

OUTPUT CURRENT

OUTPUT CURRENT (mA)

V+ = 9.0V

V+ = 11.5V

V+ = 5.5V

MEASURED FROM THE RISING EDGE

OF V+ OR SHDN TO (VOUT = 5.0V)

L = 470

µH.

MAX640/MAX653

START-UP TIME vs.

OUTPUT CURRENT

OUTPUT CURRENT (mA)

V+ = 9.0V

V+ = 11.5V

V+ = 5.0V

MEASURED FROM THE RISING EDGE OF

V+ OR SHDN TO (VOUT = 3.3V)(MAX640)

OR (VOUT = 3.0V)(MAX653). THE

START-UP TIME DIFFERENCE BETWEEN

THE MAX640 AND THE MAX653 IS

NEGLIGIBLE.

L = 470

µH

_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 3, internal feedback, L = 100µH, TA = +25°C, unless otherwise noted.)

NO-LOAD SUPPLY CURRENT vs.

INPUT VOLTAGE

INPUT VOLTAGE (V)

0 1

11 12

MAX639, VOUT = 5V

MAX653, VOUT = 3V

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