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High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
ELECTRICAL CHARACTERISTICS (continued)
(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
CONDITIONS
MIN
TYP
MAX
UNITS
N-CHANNEL SWITCH
LX On-Resistance
1.50
2.25
Ω
LX Leakage Current
LX Current Limit
V LX = +28V
Duty cycle = 90%
T A = +25 ° C
T A = +85 ° C
450
0.01
0.02
650
5
950
μA
mA
MAIN AND SUBDISPLAY ON/OFF SWITCHES
OUT1 to OUT2 On-Resistance
OUT2 to CS On-Resistance
OUT1 to OUT2 Leakage Current
OUT2 to CS Leakage Current
EN1 and EN2 Logic Input Voltage
High
EN1 and EN2 Logic Input Voltage
Low
EN1 = GND, EN2 = V+
EN1 = V+, EN2 = GND
EN1 = EN2 = V+, V OUT1 = 25V, V OUT2 = +9V, T A = +85 ° C
EN1 = EN2 = V+, V OUT2 = 12V, V CS = 0, T A = +85 ° C
+2.6V < V V+ < +5.5V
+2.6V < V V+ < +5.5V
1.6
2.5
2.5
0.05
0.05
0.6
Ω
Ω
μA
μA
V
V
EN1 and EN2 Input Leakage
V V+ = V EN1 = V EN2 = +5.5V
T A = +25 ° C
T A = +85 ° C
0.02
0.1
1
μA
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 =
-40°C to +85°C , unless otherwise noted.) (Notes 1, 3)
PARAMETER
Supply Voltage
Undervoltage Lockout (UVLO)
Threshold
Quiescent Current
Overvoltage Lockout (OVLO)
Threshold (Rising)
OUT1 Input Bias Current
CONDITIONS
V+ rising or falling
No switching, V C = +0.25V
MAX1582
MAX1582Y
V OUT1 = +26V, EN1 = EN2 = V+
MIN
2.6
2.10
26
17
20
MAX
5.5
2.55
0.56
29
19
65
UNITS
V
V
mA
V
μA
ERROR AMPLIFIER
CTRL to CS Regulation
CTRL Input Resistance
CS to COMP Transconductance
V CTRL = +1.0V, V V+ = +2.6V to +5.5V
0 < V CTRL < +1.0V
V COMP = 1.0V
0.093
290
32
0.107
780
85
V
k Ω
μS
OSCILLATOR
Operating Frequency
0.75
1.30
MHz
_______________________________________________________________________________________
3
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