MAX1620 Datasheet, PDF (5/20 Pages) Maxim Integrated Products – Digitally Adjustable LCD Bias Supplies

Digitally Adjustable LCD Bias Supplies
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.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
MAX1620 (Figure 1)
Pulse Width High (UP, DN)
t₁
Pulse Width Low (UP, DN)
t₂
Pulse Separation (UP, DN)
t₃
Counter Reset Time
t₄
MAX1621 (Figures 2 and 3)
1
µs
1
µs
1
µs
1
µs
SDA_ to SCL_ Data-Setup Time
SCL_ to SDA_ Data-Hold Time
SCL/SDA Rise Time
SCL/SDA Fall Time
SCL Low Time
SCL High Time
t_SU:_DAT
t_HD:DAT
t_R
t_F
t_LOW
t_HIGH
500
ns
0
ns
1
µs
300 ns
4.7
µs
4
µs
Start Condition SCL_ to SDA_
Setup Time
t_SU:STA
4.7
µs
Start Condition SDA_ to SCL_
Hold Time
t_HD:STA
4
µs
Stop Condition SCL_ to SDA_
Setup Time
t_SU:STO
4
µs
SCL Falling Time to SDA Valid
Master Clocking in Data
t_DV
1
µs
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.)
EFFICIENCY vs. OUTPUT CURRENT
1.00
0.95
+15V
0.90
+25V
0.85
0.80
0.75
0.70
0
10 20 30 40 50 60 70
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
1.00
0.95
0.90
-25V
0.85
-15V
0.80
0.75
0.70
0 10 20 30 40 50 60 70
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT VOLTAGE
1.00
0.95
0.90 +10mA
+20mA
0.85
0.80
0.75
0.70
12 14 16 18 20 22 24 26
OUTPUT VOLTAGE (V)
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