Rainbow-electronics MAX653 Manual de usuario descargar pdf (Pagina 3)

MAX639/MAX640/MAX653

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

Low I

, Step-Down DC-DC Converters

_______________________________________________________________________________________ 3

__________________________________________Typical Operating Characteristics

(Circuit of Figure 3, internal feedback, L = 100µH, T

= +25°C, unless otherwise noted.)

100

10µ 100µ 1

EFFICIENCY vs.

OUTPUT CURRENT

MAX639-1

OUTPUT CURRENT (A)

EFFICIENCY (%)

1m 10m 100m

L = 100µH

+ = 9V

MAX639

MAX640

MAX653

100

10µ 100µ

EFFICIENCY vs.

OUTPUT CURRENT

MAX639-2

OUTPUT CURRENT (A)

EFFICIENCY (%)

1m 10m

MAX639, V+ = 6V

MAX640, V+ = 4.3V

MAX653, V+ = 4V

100m

L = 470µH

100

10µ 100µ

EFFICIENCY vs.

OUTPUT CURRENT

MAX639-3

OUTPUT CURRENT (A)

EFFICIENCY (%)

1m 10m

MAX639

MAX640

MAX653

100m

L = 470µH

V+ = 9V

Note 2: Output guaranteed by correlation to measurements of device parameters (i.e., switch on-resistance, on-times, off-times, and

output voltage trip points).

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, I

LOAD

= 0mA, T

= T

MIN

to T

MAX

, typical values are at T

= +25°C,

unless otherwise noted.)

PARAMETER

0.4 1.2

MIN TYP MAX

mAV

LBO

= 0.4V

UNITS

LBO Leakage Current 0.001 0.1 µAV

LBO

= 11.5V

LBO Delay 25 µs50mV overdrive

2.5

SHDN Threshold

0.80 1.15 2.00 V

SHDN Pull-Up Current

0.10 0.20 0.40

Ω

µA

SHDN = 0V

µA

= +25°C

= T

MIN

to T

MAX

MAX639

MAX640/MAX653

2.8

LX Switch Leakage

0.003 1.0

30.0

VFB Bias Current 4.0 15.0 nA

VFB Dual-Mode Trip Point

LX Switch On-Resistance

0.8 1.5

VFB Threshold

1.26 1.28 1.30

1.24 1.28 1.32

LBI Bias Current 2 10

LBI Threshold

1.26 1.28 1.30

1.24 1.28 1.32

LBO Sink Current

0.8 2.5

CONDITIONS

V+ = 6V, T

= T

MIN

to T

MAX

, MAX639

V+ = 4V, T

= T

MIN

to T

MAX

, MAX640/MAX653

V+ = 11.5V, V

= 0V

VFB = 2V

V+ = 9V, T

= +25°C, MAX639/MAX640/MAX653

MAX6_ _C

MAX6_ _E/M

LBI

= 2V

MAX6_ _C

MAX6_ _E/M

1 2 3 4 5 6 7 8 ... 11 12

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Rainbow-electronics MAX653 Manual de usuario Pagina 3

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