SP7680EB datasheet(4/16 Pages) SIPEX

4 / 16 page

June 21-07 revH

SP7680: Complete Backlight Solution



2007 Sipex Corporation

Page 4

TIMING CHARACTERISTICS

Note 3: Power-up time from Shutdown

START

ADDRESS A

STATUS

CNTRL

MAIN

SUB

AUX

STOP

2C data input

Power-up time (Softstart time)

VOUT

Drivers ON

IOUT

1x mode

1.5x mode

1x mode

Note 4: Soft Start Interval (within 1x Mode)

START

ADDRESS A

STATUS

CNTRL

MAIN

SUB

AUX

STOP

2C data input (Final state)

Soft Start Interval within 1X mode

The softstart interval within 1x mode:

After mode changes from Standby to Active, the time from the rising edge of

“STATUS” acknowledge bit to the point where the ILED is within 5% of its final value at full load. This softstart is

tested with VIN = 4.0V to ensure 1x mode.

Output Current within

5% of final value

ILED

Note 5: Soft Start Interval (Transition 1x to 1.5x Mode)

START

ADDRESS A

STATUS

CNTRL

MAIN

SUB

AUX

STOP

I2C data input (Final state)

Soft Start Interval within 1.5X mode

The softstart interval from 1x to 1.5x mode: After mode changing from 1x mode to 1.5x mode, the time from the

rising edge of “CNTRL” acknowledge bit to the point where VOUT is within 5% of its final value at full load. This is

the measurement to know the boosting time of the charge pump at full load current. In this case, it is easier to

measure VOUT than IOUT. Softstart is tested with VIN = 3.4V to force a mode transition.

Mode of charge pump changes from

1x mode to 1.5x mode at the full load.

VOUT

1x mode

1.5x mode

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