Datasheet

MAX1605
30V Internal Switch LCD Bias Supply
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= SHDN = 3.3V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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, LIM, SHDN to GND....................................-0.3V to +6V
LX to GND ..............................................................-0.3V to +32V
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ...........696mW
6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
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
Supply Voltage V
CC
(Note 2) 2.4 5.5 V
Inductor Input Voltage Range V
IN
(Note 2) 0.8
V
OUT
V
V
CC
Undervoltage Lockout
V
UVLO
V
CC
falling, 50mV typical hysteresis 2.0 2.2
2.37
V
Quiescent Supply Current I
CC
V
FB
= 1.3V 18 35 µA
Shutdown Supply Current SHDN = GND 0.1 1 µA
V
CC
Line Regulation
∆V
LNR
V
OUT
= 18V, I
LOAD
= 1mA, V
IN
= 5V,
V
CC
= V
LIM
= 2.4V to 5.5V
0.1 %/V
V
IN
Line Regulation
∆V
LNR
V
OUT
= 18V, I
LOAD
= 1mA,
V
CC
= V
LIM
= 5V, V
IN
= 2.4V to 12V
0.15
%/V
Load Regulation
∆V
LDR
V
OUT
= 18V, V
CC
= V
IN
= V
LIM
= 5V,
I
LOAD
= 0mA to 20mA
0.1
%/mA
Efficiency L1 = 100µH, V
IN
= 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
LX
LX Voltage Range V
LX
30.5
V
LIM = V
CC
0.40 0.50 0.56
LIM = floating
0.20 0.25 0.285
LX 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
= 30.5V 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