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| MAX1606 Datasheet, PDF (2/10 Pages) Maxim Integrated Products – 28V Internal Switch LCD Bias Supply with True Shutdown | |||
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28V Internal Switch LCD Bias Supply
with True Shutdown
ABSOLUTE MAXIMUM RATINGS
VCC, FB, BATT, SW to GND .....................................-0.3V to +6V
BATT to SW ..............................................................-0.3V to +6V
SHDN, LIM to GND.....................................-0.3V to (VCC + 0.3V)
LX to GND ..............................................................-0.3V to +30V
Current into LX or BATT..............................................600mARMS
Current out of SW .......................................................600mARMS
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under âAbsolute Maximum Ratingsâ 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
(VCC = 3.3V, VCC = BATT = SHDN, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
VCC Supply Voltage
BATT Input Voltage Range
VCC Undervoltage Lockout
VCC Quiescent Supply Current
VCC Shutdown Supply Current
BATT Input Supply Current
BATT Shutdown Supply Current
SYMBOL
VCC
VBATT
VUVLO
ICC
IBATT
CONDITIONS
(Note 1)
(Note 1)
VCC falling, 30mV typical hysteresis
VFB = 1.3V
SHDN = GND
VFB = 1.3V
SHDN = GND
MIN TYP MAX
2.4
5.5
0.8
5.5
2.0
2.2 2.37
160 320
0.1
1
20
40
0.1
1
VCC Line Regulation
âVLNR
VOUT = 18V, ILOAD = 1mA, VBATT = 3.6V,
VCC = VLIM = 2.4V to 5.5V
0.1
BATT Line Regulation
âVLNR
VOUT = 18V, ILOAD = 1mA,
VCC = VLIM = 3.3V, VBATT = 0.8V to 5.5V
0.05
Load Regulation
âVLDR
Efficiency
Feedback Set Point
VFB
Feedback Input Bias Current
IFB
INDUCTOR CONNECTIONS (LX, SW)
LX Voltage Range
VLX
LX Switch Current Limit
ILX(MAX)
LX On-Resistance
RLX
LX Leakage Current
Maximum LX On-Time
tON
Minimum LX Off-Time
tOFF
SW Leakage Current
VOUT = 18V, VCC = VBATT = VLIM = 3.3V,
ILOAD = 0mA to 20mA
L1 = 100µH, VBATT = 3.6V, ILOAD = 10mA
VFB = 1.3V
LIM = VCC
LIM = floating
LIM = GND
VCC = 5V, ILX = 100mA
VCC = 3.3V, ILX = 100mA
VLX = 28V
VFB > 1.1V
VFB < 0.8V (soft-start)
SW = GND, VBATT = 5.5V
0.05
88
1.225 1.25 1.275
5
100
28
0.40 0.50 0.56
0.20 0.25 0.285
0.10 0.125 0.15
0.8
1
2
2
10
13
16
0.8
1.0
1.2
3.9
5.0
6.0
1
UNITS
V
V
V
µA
µA
µA
µA
%/V
%/V
%/mA
%
V
nA
V
A
â¦
µA
µs
µs
µA
2 _______________________________________________________________________________________
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