MAX1620/MAX1621
Digitally Adjustable LCD Bias Supplies
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 3.3V, V
BATT
= 10V, T
A
= 0°C to +85°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to AGND..............................................................-0.3V to 6V
PGND to AGND ..................................................................±0.3V
BATT, LX,
LCDON to AGND....................................-0.3V to 30V
DHI, DLO to PGND.....................................-0.3V to (V
DD
+ 0.3V)
DOUT, FB, POL, POK, REF to AGND.........-0.3V to (V
DD
+ 0.3V)
UP, DN, SHDN to AGND.............................................-0.3V to 6V
SCL, SDA, SUS to AGND............................................-0.3V to 6V
I
DHI
......................................................................................60mA
I
DLO
....................................................................................-30mA
I
LCDON
...............................................................................-10mA
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 8.3mW/°C above +70°C) ......................667mW
Operating Temperature Range
MAX1620EEE/MAX1621EEE ............................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
V
LCDON
= 28V, POK = 0.967V
V
LCDON
= 0.4V, POK = 1.017V
FB = -50mV
FB = REF + 100mV
POL = AGND, 3.0V ≤ V
DD
≤ 5.5V
Shutdown mode, V
SHDN
= V
DD
,V
DD
= 5.5V
POL = V
DD
, 3.0V ≤ V
DD
≤ 5.5V
Operating mode, output in regulation, V
DD
= 5.5V
V
DD
= 5V
V
DD
= 5V
V
DD
= 3.0V
LX = 12V, shutdown mode
V
DD
= 4.5V
LX = 12V, operating mode
BATT = 12V, shutdown mode
4V ≤ BATT ≤ 12V, T
A
= 0°C to +85°C
BATT = 12V, operating mode
1.8V ≤ BATT ≤ 20V, T
A
= +25°C
µA1
LCDON High, Leakage Current
mA-2 -6
LCDON Low, Sinking Current
nA
-10 85
-20 10
FB Input Current (Note 3)
mV-8 0 8
V1.46 1.5 1.53
FB Regulation Voltage
mA-25DLO Output Current (Note 3)
mA50DHI Output Current (Note 3)
Ω
14
7
On-Resistance (DLO, DHI)
16.5 23.5
µs-V
20
Microsecond-Volt Time Constant (k-factor)
V27Positive Output Voltage
920
µA
150 250
V
DD
Supply Current
1.8 20BATT Operating Range (Note 2)
1
µA
13 20
LX Input Current
µA
1
BATT Input Current
-27Negative Output Voltage
V1.5 2.8Undervoltage Lockout Threshold (Note 1)
13 20
V3.0 5.5V
DD
Operating Range
Voltage on POK rising V0.967 0.992 1.017POK Threshold Voltage
V
mV12POK Hysteresis
CONDITIONS UNITS
MIN TYP MAX
PARAMETER
V
No load V1.47 1.5 1.53REF Voltage
0µA ≤ I
REF
≤ 25mA mV310REF Load Regulation
SWITCHING REGULATOR
REFERENCE AND DAC OUTPUT
