Rainbow-electronics MAX773 Manual do Utilizador descarregar pdf (Página 3)

MAX770–MAX773

5V/12V/15V or Adjustable, High-Efficiency,

Low I

, Step-Up DC-DC Controllers

_______________________________________________________________________________________

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

REF Load Regulation

0µA ≤ I

REF

≤ 100µA

MAX77_C/E 4 10

MAX77_M 4 15

REF Line Regulation 3V ≤ V+ ≤ 16.5V 40 100

µV/V

FB Trip-Point Voltage V

MAX77_C 1.4700 1.50 1.5300

VMAX77_E 1.4625 1.50 1.5375

MAX77_M 1.4550 1.50 1.5450

FB Input Current I

MAX77_C ±20

nAMAX77_E ±40

MAX77_M ±60

SHDN Input High Voltage V

V+ = 2.0V to 16.5V 1.6 V

SHDN Input Low Voltage V

MAX77_C/E, V+ = 2.0V to 16.5V 0.4

SHDN Input Current ±1

µA

LBI Input Current MAX773, V+ = 16.5V, LBI = 1.5V ±20 nA

LBI Hysteresis MAX773 20

LBI Threshold Voltage MAX773, LBI falling

MAX77_C 1.4700 1.50 1.5300

VMAX77_E 1.4625 1.50 1.5375

MAX77_M 1.4550 1.50 1.5450

LBO Leakage Current MAX773, V+ = 16.5V, V

LBO

= 16.5V 0.01 1.00

µA

LBO Output Voltage Low V

MAX773, V+ = 5V, LBO sinking 1mA 0.1 0.4 V

V+ = 16.5V, SHDN = 0V or V+

Current-Limit Trip Level V

V+ = 5V to 16.5V 170 200 230 mV

SHUNT

MAX773, I

SHUNT

= 1mA to 20mA,

SGND = 0V, C

SHUNT

= 0.1µF

5.5 6.3 V

CS Input Current 0.01 ±1

µA

EXT Rise Time V+ = 5V, 1nF from EXT to ground (Note 3) 55 ns

EXT Fall Time V+ = 5V, 1nF from EXT to ground (Note 3) 55 ns

Supply Voltage in

Shunt Mode

Note 1: Output voltage guaranteed using preset voltages. See Figures 7a–7d for output current capability versus input voltage.

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

Note 3: For the MAX773, EXT is EXTH and EXTL shorted together.

LBI Delay 5mV overdrive 2.5 µs

MAX77_M, V+ = 2.0V to 16.5V 0.2

1 2 3 4 5 6 7 8 ... 19 20

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