Rainbow-electronics MAX744A Uživatelský manuál stáhnout pdf (Strana 3)

MAX730A/MAX738A/MAX744A

5V, Step-Down,

Current-Mode PWM DC-DC Converters

_______________________________________________________________________________________ 3

Note 1: The standby current typically settles to 25µA (over temperature) within 2 seconds; however, to decrease test time, the part

is guaranteed at a 100µA maximum value.

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/MAX744A, I

LOAD

= 0mA, T

= T

MIN

to T

MAX

unless otherwise noted.)

PARAMETER

LOAD

= 0mA to 300mA

MAX730A

MIN TYP MAX

Supply Current

(includes switch

current)

LOAD

= 0mA to 750mA

UNITS

V+ = 9.0V, I

LOAD

= 300mA

MAX738A

MIN TYP MAX

4.3

MAX744AE

= 500mA

6.0 100.0 6.0 100.06.0 100.0 µAStandby Current

0.0005

LX On Resistance

2.0 2.02.0

MAX744AC/AE

0.5

MAX744A

MIN TYP MAX

0.25 0.250.25

0.5

0.0005

Shutdown Input

Threshold

%/mA

Shutdown Input

Leakage Current

V+ = 12V, I

LOAD

= 750mA

Load Regulation

0.0005

SHDN = 0V (Note 1)

0.5

1.7 3.0 1.7 3.01.7 3.0

159.0 185.0 212.5

Ω

MAX744AC/AE 1.2 2.5

V+ = 12V, LX = 0V

MAX744AM

1.0

3.0

1.0 1.0

V+ = 6.0V

to 9.0V

MAX744AC/AE 3.0

1.0 µA

Reference Drift

1.01.0

MAX744AM

µA

3.5

1.5

MAX744AM

V+ = 9.0V

to 12.0V

MAX744AC 4.0

50 50

LX Leakage Current

1.5

CONDITIONS

AShort-Circuit Current

V+ rising

159.0 216.5

5.7 6.0 5.7 6.04.7 5.2

V+ falling 5.0 5.7

kHz

Undervoltage

Lockout

%Efficiency

V+ = 6.0V

to 16.0V

V+ = 12V, T

= +25°CReference Voltage 1.15 1.23 1.30 1.15 1.23 1.301.15 1.23 1.30 V

130 160 190130 170 210

ppm/°C

Oscillator Frequency

7500 75007500 Ω

Compensation Pin

Impedance

4.5

V+ = 12.0V

to 16.0V

MAX744AM

1 2 3 4 5 6 7 8 ... 15 16

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