Rainbow-electronics MAX763A Bedienungsanleitung PDF herunterladen (Seite 3)

MAX748A/MAX763A

3.3V, Step-Down,

Current-Mode PWM DC-DC Converters

_________________________________________________________________________________________________

Note 1: The standby current typically settles to 10µA (over temperature) within 2 seconds; however, to decrease test time, the part

is guaranteed at a 100µA maximum value.

MAXIMUM OUTPUT CURRENT

vs. SUPPLY VOLTAGE

MAXIMUM OUTPUT CURRENT (mA)

200

400

600

800

1000

0246810121416

SUPPLY VOLTAGE (V)

MAX748A

MAX763A

NOTE 2

MAX763A

EFFICIENCY vs. OUTPUT CURRENT

EFFICIENCY (%)

100

0 100 200 300 400 500 600 700 800

OUTPUT CURRENT (mA)

= 7.0V

= 5.0V

= 11.0V

NOTE 2

MAX748A

EFFICIENCY vs. OUTPUT CURRENT

EFFICIENCY (%)

OUTPUT CURRENT (mA)

100

0 100 200 300 400 500 600 700 800 900

= 4.5V

= 16V

= 12V

= 9V

= 6V

NOTE 2

________________________________________________Typical Operating Characteristics

(Circuit of Figure 3, T

= +25°C, V

OUT

= 3.3V, unless otherwise noted.)

PARAMETER CONDITIONS

MAX748A MAX763A

UNITS

MIN TYP MAX MIN TYP MAX

Efficiency V+ = 5V

LOAD

= 300mA 88 88

LOAD

= 100mA 90 90

Supply Current Includes switch current 1.7 3.0 1.4 2.5 mA

Shutdown Current

SHDN

= 0V (Note 1) 0.2 100.0 0.2 100.0 µA

Shutdown Input

2.0 2.0

Threshold

0.25 0.25

Shutdown Input

1.0 1.0 µA

Leakage Current

Short-Circuit Current 1.2 1.2 A

Undervoltage Lockout V+ falling 2.7 3.0 2.7 3.0 V

LX On Resistance I

= 500mA 1.0 1.0 Ω

LX Leakage Current V+ = 12V, LX = 0 10 10 nA

Reference Voltage T

= +25°C 1.15 1.22 1.30 1.15 1.22 1.30 V

Reference Drift T

= T

MIN

to T

MAX

50 50 ppm/°C

Oscillator Frequency 159 180 212.5 159 200 212.5 kHz

Compensation Pin

7500 7500 Ω

Impedance

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 3, V+ = 5V, I

LOAD

= 0mA, T

= T

MIN

to T

MAX

, unless otherwise noted.)

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

MAX748A/MAX763A 1
3.3V, Step-Down 1

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