Rainbow-electronics MAX1771 Manual do Utilizador descarregar pdf (Página 3)

MAX1771

12V or Adjustable, High-Efficiency,

Low I

, Step-Up DC-DC Controller

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 5V, I

LOAD

= 0mA, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETERS

SYMBOL CONDITIONS MIN TYP MAX UNITS

FB Input Current I

MAX1771C ±20

nAMAX1771E ±40

MAX1771M ±60

SHDN Input High Voltage V

V+ = 2V to 16.5V 1.6 V

SHDN Input Low Voltage V

V+ = 2V to 16.5V 0.4 V

SHDN Input Current ±1 µAV+ = 16.5V, SHDN = 0V or V+

Current-Limit Trip Level V

V+ = 5V to 16V

85 100 115

CS Input Current 0.01 ±1 µA

EXT Rise Time V+ = 5V, 1nF from EXT to ground 55 ns

EXT Fall Time V+ = 5V, 1nF from EXT to ground 55 ns

Note 1: Output voltage guaranteed using preset voltages. See Figures 4a–4d for output current capability versus input voltage.

Note 2: Output voltage line and load regulation depend on external circuit components.

75 100 125

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

100

10,000

1000

EFFICIENCY vs. LOAD CURRENT

(BOOTSTRAPED MODE)

LOAD CURRENT (mA)

EFFICIENCY (%)

= 5V

= 3V

= 8V

= 10V

OUT

= 12V

CIRCUIT OF

FIGURE 2a

MAX1771–01

100

10,000

1000

EFFICIENCY vs. LOAD CURRENT

(NON-BOOTSTRAPED MODE)

LOAD CURRENT (mA)

EFFICIENCY (%)

= 5V

=10V

= 8V

OUT

= 12V

CIRCUIT OF

FIGURE 2b

MAX1771–02

2.00

LOAD CURRENT vs.

MINIMUM START-UP INPUT VOLTAGE

MAX1771-TOC3

MINIMUM START-UP INPUT VOLTAGE (V)

LOAD CURRENT (mA)

100

200

300

400

500

600

700

2.25 2.50 2.75 3.00 3.25 3.50

EXTERNAL FET THRESHOLD

LIMITS FULL-LOAD START-UP

BELOW 3.5V

OUT

= 12V, CIRCUIT OF FIGURE 2a

MAX1771C/E

MAX1771M

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

, Step-Up DC-DC Controller 1

Comentários a estes Manuais

Sem comentários

Rainbow-electronics MAX1771 Manual do Utilizador Página 3

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics MAX1771