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High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
ABSOLUTE MAXIMUM RATINGS
V+, VP, CTRL to GND............................................-0.3V to +6.0V
PGND to GND .......................................................-0.3V to +0.3V
LX, OUT1 to GND ...................................................-0.3V to +30V
OUT2 to GND .........................................................-0.3V to +14V
COMP, CS, EN1, EN2 to GND ....................-0.3V to (V V+ + 0.3V)
I LX .................................................................................................... 1A RMS
Continuous Power Dissipation (T A = +70 ° C)
12-Pin Thin QFN (derate 16.9mW/ ° C above +70 ° C) ....1349mW
16-Pin UCSP (derate 6.5mW/ ° C above +70 ° C)..............518mW
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 “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 V+ = +3.0V, V OUT1 = 20V, L1 = 22μH, C OUT = 0.1μF, C COMP = 0.022μF, R SENSE = 7.5 Ω , V CTRL = +1.5V, EN1 = EN2 = V+, T A =
0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
Supply Voltage
Undervoltage Lockout (UVLO)
Threshold
V+ rising or falling
CONDITIONS
MIN
2.6
2.10
TYP
2.38
MAX
5.5
2.55
UNITS
V
V
UVLO Hysteresis
40
mV
Quiescent Current
No switching, V CTRL = V CS = +0.25V
0.40
0.56
mA
Shutdown Supply Current
Overvoltage Lockout (OVLO)
Threshold (Rising)
OVLO Hysteresis
EN1 = EN2 = GND, OUT1 = V+
MAX1582
MAX1582Y
MAX1582
MAX1582Y
MAX1582, V OUT1 = +26V, EN1 = EN2 = V+
T A = +25 ° C
T A = +85 ° C
26
17
20
0.01
0.1
27
18
2
1.3
40
1
29
19
65
μA
V
V
OUT1 Input Bias Current
Output Voltage Range (Note 2)
MAX1582Y, V OUT1 = +16V, EN1 = EN2 = V+
T A = +25 ° C
OUT1 = V+, EN1 = EN2 = GND
T A = +85 ° C
MAX1582
20
(V V+ -
V DIODE )
40
0.01
0.05
65
1
25.5
μA
V
ERROR AMPLIFIER
MAX1582Y
(V V+ -
V DIODE )
17.0
CTRL to CS Regulation
CS Input Bias Current
CTRL Input Resistance
CS to COMP Transconductance
V CTRL = +1.0V, V V+ = +2.6V to +5.5V
V CS = V CTRL / 10
0 < V CTRL < +1V
V COMP = +1.0V
T A = +25 ° C
T A = +85 ° C
0.095
290
32
0.100
0.01
1
500
50
0.106
1
780
82
V
μA
k Ω
μS
OSCILLATOR
Operating Frequency
Minimum Duty Cycle
PWM mode
Pulse skipping
0.80
1.0
12
0
1.25
MHz
%
Maximum Duty Cycle
CTRL = V+, CS = GND
91
94
%
2
_______________________________________________________________________________________
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