Rainbow-electronics MAX1729 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX1729

ECB and LCD Display Bias Supply with Accurate

Output Voltage and Temperature Compensation

_______________________________________________________________________________________ 3

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

Note 2: When V

is below this level, the boost and LDO outputs are disabled.

Note 3: Guaranteed by design.

Note 4: Minimum time to hold CTLIN low to invoke shutdown. If CTLIN is held low for less than t

OFF

, device does not enter shutdown.

Note 5: Switching regulator regulates this voltage to keep LDO from dropping out.

ELECTRICAL CHARACTERISTICS

= +3V, CTLIN = IN, FB = GND, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.) (Note 1)

= 0, Internal Feedback Mode

V0.4 0.6 1.0

= +5.5V, CTLIN = GND or IN

= +2.7V to +5.5V

PS to OUT Voltage (Note 5)

= +25°C

DIODE

= 30mA

(Note 4)

= 30mA

ns25

CONDITIONS

511

V-µs

6810

KPFM On-Time Constant

CTLIN

CTLIN Minimum Pulse Width

for V

OUT

Control

= +1.25V ns

Ω

60 150

COMP

COMP Impedance

µA±1I

IHL

V0.4V

CTLIN Low Voltage

CTLIN Bias Current

20t

COMP Rise/Fall Time

= +5.5V 1.5

mV700 970V

LX-PS

LX to PS Diode Forward

Voltage

µs700 1250 2400t

OFF

CTLIN Minimum Pulse Width

for Shutdown

Ω

2.5 5.0

Switch On-Resistance

UNITSMIN TYP MAXSYMBOLPARAMETER

= +2.7V

= 18V µA0.1 1I

LX(OFF)

Switch Off-Leakage Current

FB =

+1.25V, External Feedback Mode

kΩ

= -40°C to +85°C

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

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