Rainbow Electronics MAX1621 - Manual (Page 5)

MAX1620/MAX1621
Digitally Adjustable LCD Bias Supplies
_______________________________________________________________________________________ 5
TIMING CHARACTERISTICS
(V DD = 3.3V, V BATT = 10V, T A = -40°C to +85°C . Typical values are at T A = +25°C, unless otherwise noted. Limits over this
temperature range are guaranteed by design.)
CONDITIONS
4
Stop Condition SCL_ to SDA_
Setup Time
µs t SU:STO
µs 4 t HD:STA
Start Condition SDA_ to SCL_
Hold Time
µs 4.7 t SU:STA
Start Condition SCL_ to SDA_
Setup Time
µs 4 t HIGH SCL High Time
µs 4.7 t LOW SCL Low Time
ns 300 t F SCL/SDA Fall Time
µs 1 t 1 Pulse Width High (UP, DN)
µs 1 t R SCL/SDA Rise Time
ns 0 t HD:DAT SCL_ to SDA_ Data-Hold Time
ns 500 t SU : DAT SDA_ to SCL_ Data-Setup Time
µs 1 t 2 Pulse Width Low (UP, DN)
µs 1 t 3 Pulse Separation (UP, DN)
µs 1 t 4 Counter Reset Time
UNITS MIN TYP MAX SYMBOL PARAMETER
Note 1: The setting in the DAC is guaranteed to remain valid as long as V DD 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
(V DD = 5V, V BATT = 10V, L1 = 100µH, T A = +25°C, unless otherwise noted.)
0.70
0.75
0.80
0.85
0.90
0.95
1.00
0 10 20 30 40 50 60 70
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
0 10 20 30 40 50 60 70
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
1
SCL Falling Time to SDA Valid
Master Clocking in Data
µs t DV
MAX1620 (Figure 1)
MAX1621 (Figures 2 and 3)