Rainbow-electronics MAX669 Manual do Utilizador descarregar pdf (Página 3)

MAX668/MAX669

1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

_______________________________________________________________________________________ 3

100 500SYNC Input Frequency Range

SYNC/SHDN Falling Edge to Shutdown Delay

2 5 EXT high or lowEXT On-Resistance

1EXT forced to 2V

Ω

EXT Sink/Source Current

1.51.8V < V

< 3.0V (MAX669)

SYNC/SHDN Input High Voltage

0.301.8V < V

< 3.0V (MAX669)

µA

SYNC/SHDN Input Low Voltage

0.5 3.0

SYNC/SHDN = 5V

SYNC/SHDN Input Current

1.5 6.5

SYNC/SHDN = 28V

MIN TYP MAXCONDITIONSPARAMETER

µs

kHz

UNITS

ELECTRICAL CHARACTERISTICS (continued)

= LDO = +5V, R

OSC

= 200kΩ, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

ELECTRICAL CHARACTERISTICS

= LDO = +5V, R

OSC

= 200kΩ, T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

2.40 2.60

Sensed at LDO, falling edge,

hysteresis = 1%, MAX669 only

LDO Undervoltage Lockout Threshold

2.65 5.50

3V ≤ V

≤ 28V

(includes LDO dropout)

4.50 5.50

5V ≤ V

≤ 28V

(includes LDO dropout)

LDO Output Voltage

Reference and LDO Regulators

328MAX668

PWM Controller

Input Voltage Range, V

SYNC/SHDN = GND, V

= 28V

Shutdown Supply Current (V

)

350V

= 1.30V, V

= 3V to 28V

µA

Supply Current (Note 1)

1CS+ forced to GND

µA

CS+ Input Current

327

µA

Idle Mode Current-Sense Threshold

2.7 5.5

Input Voltage Range with V

Tied to LDO

1.22 1.28

FB Threshold

20 V

= 1.30V nAFB Input Current

85 115

Current-Limit Threshold

MIN MAXCONDITIONS

PARAMETER

UNITS

86 90 94R

OSC

= 500kΩ ±1%

MAX669

LDO load =

∞ to 400Ω

1.8 28

3.0V < V

< 28V

3.0V < V

< 28V 2.0

0.45

200

Not testedSYNC Input Rise/Fall Time ns

50 200Minimum SYNC Input Low Pulse Width ns

20 45Minimum SYNC Input-Pulse Duty Cycle %

290Minimum EXT Pulse Width ns

87 90 93R

OSC

= 200kΩ ±1%

86 90 94R

OSC

= 100kΩ ±1%Maximum Duty Cycle %

PWM CONTROLLER

REFERENCE AND LDO REGULATORS

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

MAX668/MAX669 1
Controllers in µMAX 1

Comentários a estes Manuais

Sem comentários

Rainbow-electronics MAX669 Manual do Utilizador Página 3

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics MAX669