Rainbow-electronics MAX669 Manual do Utilizador descarregar pdf (Página 4)

MAX668/MAX669

1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

4 _______________________________________________________________________________________

%Minimum SYNC Input-Pulse Duty Cycle 45

Minimum SYNC Input Low Pulse Width 200

SYNC Input Rise/Fall Time Not tested 200 ns

ELECTRICAL CHARACTERISTICS (continued)

= LDO = +5V, R

OSC

= 200kΩ, T

= -40°C to +85°C, unless otherwise noted.)

OSC

= 200kΩ ±1% 87 93

SYNC Input Frequency Range 100 500 kHz

1.8V < V

< 3.0V (MAX669) 0.30

1.8V < V

< 3.0V (MAX669) 1.5

SYNC/SHDN = 28V

6.5

µA

EXT On-Resistance EXT high or low 5 Ω

SYNC/SHDN Input Current

SYNC/SHDN = 5V

3.0

Note 1: This is the V

current consumed when active but not switching. Does not include gate-drive current.

Note 2: Limits at T

= -40°C are guaranteed by design.

222 278

UNITSPARAMETER CONDITIONS MIN MAX

OSC

= 200kΩ ±1%

%Maximum Duty Cycle

OSC

= 500kΩ ±1% 86 94

425 575R

OSC

=100kΩ ±1% kHzOscillator Frequency

85 115R

OSC

= 500kΩ ±1%

OSC

= 100kΩ ±1% 86 94

SYNC/SHDN Input High Voltage

3.0V < V

< 28V 2.0

SYNC/SHDN Input Low Voltage

3.0V < V

< 28V 0.45

VREF Output Voltage No load, C

REF

= 0.22µF 1.22 1.28

mVREF Load Regulation REF load = 0 to 50µA -10

VREF Undervoltage Lockout Threshold Rising edge, 1% hysteresis 1.0 1.2

OSCILLATOR

1 2 3 4 5 6 7 8 9 ... 17 18

MAX668/MAX669 1
Controllers in µMAX 1

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