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High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
ELECTRICAL CHARACTERISTICS (continued)
(V CC = 3.3V, V OV = 0V, C OUT = 1μF, R SENSE = 10 ? , T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25 ° C.)
PARAMETER
LX Current Limit
CONDITIONS
MAX1553
MAX1554, V CC = 4.2V
MIN
300
600
TYP
480
970
MAX
600
1200
UNITS
mA
LX Leakage Current
V LX = 38V,
V EN = 0V
T A = +25°C
T A = +85°C
0.1
1
5
μA
SHUTDOWN CONTROL
EN Logic-Level High
EN Logic-Level Low
1.8
0.4
V
V
EN Input Current
V EN = 0V or 5.5V
T A = +25°C
T A = +85°C
0.01
0.1
1
μA
ELECTRICAL CHARACTERISTICS
(V CC = 3.3V, V OV = 0V, C OUT = 1μF, R SENSE = 10 ? , T A = -40°C to +85°C , unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
Undervoltage Lockout Threshold
Quiescent Current
OV Threshold
BRT Input Resistance
CONDITIONS
MAX1553
MAX1554
V CC rising or falling, 35mV hysteresis typical
Not switching
Switching
Rising edge
0 < V BRT < 1.5V, EN = V CC
MIN
2.7
3.15
2.35
1.18
200
MAX
5.5
5.50
2.65
0.65
0.9
1.33
600
UNITS
V
V
mA
V
k ?
TIMING CONTROL
Maximum On-Time
Minimum Off-Time
V CC = 3.3V
2.0
150
4.8
350
μs
ns
ERROR AMPLIFIER
FB Threshold
V BRT = 1.25V
192
217
mV
N-CHANNEL SWITCH
LX On-Resistance
1.4
?
LX Current Limit
MAX1553
MAX1554, V CC = 4.2V
300
600
600
1200
mA
SHUTDOWN CONTROL
EN Logic-Level High
EN Logic-Level Low
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
1.8
0.4
V
V
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3
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