MAX1606
28V Internal Switch LCD Bias Supply
with True Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V, V
CC
= BATT = SHDN, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
V
CC
, FB, BATT, SW to GND .....................................-0.3V to +6V
BATT to SW ..............................................................-0.3V to +6V
SHDN, LIM to GND.....................................-0.3V to (V
CC
+ 0.3V)
LX to GND ..............................................................-0.3V to +30V
Current into LX or BATT..............................................600mA
RMS
Current out of SW .......................................................600mA
RMS
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage V
CC
(Note 1) 2.4 5.5 V
BATT Input Voltage Range V
BATT
(Note 1) 0.8 5.5 V
V
CC
Undervoltage Lockout V
UVLO
V
CC
falling, 30mV typical hysteresis 2.0 2.2 2.37 V
V
CC
Quiescent Supply Current I
CC
V
FB
= 1.3V 160 320 µA
V
CC
Shutdown Supply Current SHDN = GND 0.1 1 µA
BATT Input Supply Current I
BATT
V
FB
= 1.3V 20 40 µA
BATT Shutdown Supply Current SHDN = GND 0.1 1 µA
V
CC
Line Regulation ∆V
LNR
V
OUT
= 18V, I
LOAD
= 1mA, V
BATT
= 3.6V,
V
CC
= V
LIM
= 2.4V to 5.5V
0.1 %/V
BATT Line Regulation ∆V
LNR
V
OUT
= 18V, I
LOAD
= 1mA,
V
CC
= V
LIM
= 3.3V, V
BATT
= 0.8V to 5.5V
0.05 %/V
Load Regulation ∆V
LDR
V
OUT
= 18V, V
CC
= V
BATT
= V
LIM
= 3.3V,
I
LOAD
= 0mA to 20mA
0.05 %/mA
Efficiency L1 = 100µH, V
BATT
= 3.6V, I
LOAD
= 10mA 88 %
Feedback Set Point V
FB
1.225 1.25 1.275 V
Feedback Input Bias Current I
FB
V
FB
= 1.3V 5 100 nA
INDUCTOR CONNECTIONS (LX, SW)
LX Voltage Range V
LX
28 V
LIM = V
CC
0.40 0.50 0.56
LIM = floating 0.20 0.25 0.285LX Switch Current Limit I
LX
MAX
LIM = GND 0.10 0.125 0.15
A
V
CC
= 5V, I
LX
= 100mA 0.8
LX On-Resistance R
LX
V
CC
= 3.3V, I
LX
= 100mA 1 2
Ω
LX Leakage Current V
LX
= 28V 2 µA
Maximum LX On-Time t
ON
10 13 16 µs
V
FB
> 1.1V 0.8 1.0 1.2
Minimum LX Off-Time t
OFF
V
FB
< 0.8V (soft-start) 3.9 5.0 6.0
µs
SW Leakage Current SW = GND, V
BATT
= 5.5V 1
A
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