Datasheet

MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= V
SHDN
= 3.6V, SW open, V
FB
= 1.3V (MAX8570/MAX8571/MAX8574) or V
OUT
= 16V (MAX8572/MAX8573/MAX8575), T
A
=
-40°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
, SHDN to GND..................................................-0.3V to +6V
SW to GND .................................................-0.3V to (V
CC
+ 0.3V)
FB to GND (MAX8570/MAX8571/
MAX8574)...............................................-0.3V to (V
CC
+ 0.3V)
OUT to GND (MAX8572/MAX8573/MAX8575) .......-0.3V to +30V
LX to GND ..............................................................-0.3V to +30V
I
LX
, I
CC
..............................................................................600mA
Continuous Power Dissipation (T
A
= +70°C)
μDFN (derate 4.5mW/°C above +70°C)....................357.8mW
SOT23-6 (derate 8.7mW/°C above +70°C)...............695.7mW
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
Soldering Temperature (reflow) .......................................+260°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Voltage Range 2.70 5.50 V
V
CC
Undervoltage Lockout V
CC
rising, 50mV typical hysteresis 2.33 2.5 2.65 V
V
CC
Supply Current 25 35 μA
T
A
= +25°C 0.05 1
V
CC
Shutdown Current SHDN = GND, V
CC
= 5.5V
T
A
= -40°C to +85°C 0.05
μA
Line Regulation
Circuit of Figure 3, V
OUT
= 15V, I
LOAD
= 5mA,
V
CC
= 2.7V to 5.5V
0.1 %/V
Load Regulation Circuit of Figure 3, V
OUT
= 15V, I
LOAD
= 0 to 5mA 0.1 %/mA
T
A
= 0°C to +85°C 1.216 1.226 1.236
FB Regulation Voltage
T
A
= -40°C to +85°C 1.2137 1.2383
V
FB Input Bias Current -50 -4 +50 nA
T
A
= 0°C to +85°C 14.85 15 15.15
OUT Regulation Voltage
T
A
= -40°C to +85°C 14.813 15.187
V
OUT Input Bias Current V
OUT
= 15V 2.4 4.4 μA
LX Voltage Range 28 V
MAX8571/MAX8573 0.217 0.241 0.267
MAX8570/MAX8572 0.088 0.101 0.108LX Switch Current Limit (Note 2)
MAX8574/MAX8575 0.425 0.484 0.540
A
MAX8571/MAX8573/MAX8574/MAX8575, I
LX
= 100mA 0.9 1.5
LX On-Resistance
MAX8570/MAX8572, I
LX
= 50mA 1.5 2.4
Ω
T
A
= +25°C 0.01 2
LX Leakage Current V
LX
= 28V
T
A
= -40°C to +85°C 0.05
μA
Maximum LX On-Time 81114μs
V
FB
> 1V or V
OUT
> 12.2V 0.8 1 1.2
Minimum LX Off-Time
V
FB
= 0.25V or V
OUT
= 3.4V 4.0 5 6.0
μs
Current-Limit Propagation Delay 55 ns
SHDN Low Level (V
IL
) 2.7V ≤ V
CC
≤ 5.5V 0.7 V
4.2V ≤ V
CC
≤ 5.5V 1.5
SHDN High Level (V
IH
)
2.7V ≤ V
CC
< 4.2V 1.4
V
SHDN Leakage Current -1 +1 μA