MAX686 Datasheet, PDF (2/16 Pages) Maxim Integrated Products – DAC-Controlled Boost/Inverter LCD Bias Supply with Internal Switch

DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
ABSOLUTE MAXIMUM RATINGS
Voltage
V_CC, ISET, POK, POL, SHDN,
UP, DN, V_DD to GND ...........................................-0.3V to +6V
FB, REF, DACOUT to GND.......................-0.3V to (V_CC + 0.3V)
PGND to GND .....................................................-0.3V to +0.3V
LX, LCDON to GND..............................................-0.3V to +30V
Current
LX (sinking) .....................................................................600mA
LCDON (sinking)...............................................................10mA
Continuous Power Dissipation (T_A = +70°C)
QSOP (derate 8.30mW/°C above +70°C) ......................667mW
Operating Temperature Ranges
MAX686C/D ..........................................................0°C to +70°C
MAX686EEE.......................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V_CC = V_DD = V_IN = +5V, C_REF = 0.1µF, T_A = 0°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Supply Voltage (Note 1)
Input Voltage
Supply Current
Shutdown Current
V_CC Undervoltage Lockout
V_CC, V_DD
V_IN
I_CC + I_DD
I_SHDN
V_LOCK
Voltage applied to L1
POL = GND, V_FB = 1.3V, I_DACOUT = 0mA
SHDN = GND
Rising or falling
2.7
0.8
2.10
5.5
V_OUT
65
125
1.3
4
2.5
2.65
V_CC Undervoltage Lockout
Hysteresis
100
V_CC DAC Reset Threshold
V_RESET
0.5
1.5
2.1
Line Regulation
Boost configuration, V_OUT = 27.5V,
I_LOAD = 5mA, V_CC = V_DD = 2.7V to 5.5V
0.1
Load Regulation
Boost configuration, V_OUT = 27.5V,
I_LOAD = 0mA to 5mA
0.01
LX
LX Voltage Range
LX Switch Current Limit
LX On-Resistance
LX Leakage Current
Maximum LX On-Time
Minimum LX Off-Time
V_LX
I_LX
R_LX
I_LXLEAK
t_ON
t_OFF
ISET = V_CC
ISET = GND
V_CC = V_DD = 5V, I_LX = 100mA
V_CC = V_DD = 3.3V, I_LX = 100mA
V_LX = 28V
POL = GND, V_FB > 1.2V
POL = V_CC, V_FB < 0.15V
POL = GND, V_FB < 0.8V
POL = V_CC, V_FB > 0.4V
28
0.42 0.50 0.58
0.21 0.25 0.29
0.6
1.2
0.8
1.6
1.5
8
10
12
0.8
1
1.2
2.8
3.5
4.2
4
5
6
4
5
6
UNITS
V
V
µA
µA
V
mV
V
%/V
%/mA
V
A
Ω
µA
µs
µs
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