Rainbow-electronics MAX1621 Manual do Utilizador descarregar pdf (Página 5)

MAX1620/MAX1621

Digitally Adjustable LCD Bias Supplies

_______________________________________________________________________________________ 5

TIMING CHARACTERISTICS

= 3.3V, V

BATT

= 10V, T

= -40°C to +85°C. Typical values are at T

= +25°C, unless otherwise noted. Limits over this

temperature range are guaranteed by design.)

CONDITIONS

Stop Condition SCL_ to SDA_

Setup Time

µst

SU:STO

µs4t

HD:STA

Start Condition SDA_ to SCL_

Hold Time

µs4.7t

SU:STA

Start Condition SCL_ to SDA_

Setup Time

µs4t

HIGH

SCL High Time

µs4.7t

LOW

SCL Low Time

ns300t

SCL/SDA Fall Time

µs1t

Pulse Width High (UP, DN)

µs1t

SCL/SDA Rise Time

ns0t

HD:DAT

SCL_ to SDA_ Data-Hold Time

ns500t

DAT

SDA_ to SCL_ Data-Setup Time

µs1t

Pulse Width Low (UP, DN)

µs1t

Pulse Separation (UP, DN)

µs1t

Counter Reset Time

UNITSMIN TYP MAXSYMBOLPARAMETER

Note 1: The setting in the DAC is guaranteed to remain valid as long as V

is greater than the UVLO threshold.

Note 2: BATT Operating Range is guaranteed by the Microsecond-Volt Time Constant specification.

Note 3: Current sourced from a pin is denoted as positive current. Current sunk into a pin is denoted as negative current.

Note 4: Guaranteed by design.

__________________________________________Typical Operating Characteristics

= 5V, V

BATT

= 10V, L1 = 100µH, T

= +25°C, unless otherwise noted.)

0.70

0.75

0.80

0.85

0.90

0.95

1.00

010203040506070

EFFICIENCY vs. OUTPUT CURRENT

MAX1620/21-01

OUTPUT CURRENT (mA)

EFFICIENCY (%)

+25V

+15V

0.70

0.75

0.80

0.85

0.90

0.95

1.00

010203040506070

EFFICIENCY vs. OUTPUT CURRENT

MAX1620/21-02

OUTPUT CURRENT (mA)

EFFICIENCY (%)

-25V

-15V

0.70

0.75

0.80

0.85

0.90

0.95

1.00

12 14 16 18 20 22 24 26

EFFICIENCY vs. OUTPUT VOLTAGE

MAX1620/21-03

OUTPUT VOLTAGE (V)

EFFICIENCY (%)

+10mA

+20mA

SCL Falling Time to SDA Valid

Master Clocking in Data

µst

MAX1620 (Figure 1)

MAX1621 (Figures 2 and 3)

1 2 3 4 5 6 7 8 9 10 ... 19 20

MAX1620/MAX1621 1

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