MAX669 datasheet(4/18 Pages) MAXIM

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1.8V to 28V Input, PWM Step-Up

Controllers in µMAX

_______________________________________________________________________________________

Minimum SYNC Input-Pulse Duty Cycle

Minimum SYNC Input Low Pulse Width

200

SYNC Input Rise/Fall Time

Not tested

200

ELECTRICAL CHARACTERISTICS (continued)

(VCC = LDO = +5V, ROSC = 200kΩ, TA = -40°C to +85°C, unless otherwise noted.)

ROSC = 200kΩ ±1%

SYNC Input Frequency Range

100

500

kHz

1.8V < VCC < 3.0V (MAX669)

0.30

1.8V < VCC < 3.0V (MAX669)

1.5

SYNC/SHDN = 28V

6.5

µA

EXT On-Resistance

EXT high or low

Ω

SYNC/SHDN Input Current

SYNC/SHDN = 5V

3.0

Note 1: This is the VCC current consumed when active but not switching. Does not include gate-drive current.

Note 2: Limits at TA = -40°C are guaranteed by design.

222

278

UNITS

PARAMETER

CONDITIONS

MIN

MAX

ROSC = 200kΩ ±1%

Maximum Duty Cycle

ROSC = 500kΩ ±1%

425

575

ROSC =100kΩ ±1%

kHz

Oscillator Frequency

115

ROSC = 500kΩ ±1%

ROSC = 100kΩ ±1%

SYNC/SHDN Input High Voltage

3.0V < VCC < 28V

2.0

SYNC/SHDN Input Low Voltage

3.0V < VCC < 28V

0.45

REF Output Voltage

No load, CREF = 0.22µF

1.22

1.28

REF Load Regulation

REF load = 0 to 50µA

-10

REF Undervoltage Lockout Threshold

Rising edge, 1% hysteresis

1.0

1.2

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