MAX1553 Datasheet, PDF (3/11 Pages) Maxim Integrated Products – High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs

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 = 10Ω, T_A = 0°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C.)
PARAMETER
LX Current Limit
LX Leakage Current
SHUTDOWN CONTROL
EN Logic-Level High
EN Logic-Level Low
EN Input Current
CONDITIONS
MAX1553
MAX1554, V_CC = 4.2V
V_LX = 38V,
V_EN = 0V
T_A = +25°C
T_A = +85°C
V_EN = 0V or 5.5V ^{TA = +25°C}
T_A = +85°C
MIN
TYP
MAX UNITS
300
480
600
mA
600
970
1200
0.1
5
µA
1
1.8
V
0.4
V
0.01
1
µA
0.1
ELECTRICAL CHARACTERISTICS
(V_CC = 3.3V, V_OV = 0V, C_OUT = 1µF, R_SENSE = 10Ω, T_A = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
MAX1553
2.7
Supply Voltage
MAX1554
3.15
Undervoltage Lockout Threshold
V_CC rising or falling, 35mV hysteresis typical
2.35
Quiescent Current
Not switching
Switching
OV Threshold
Rising edge
1.18
BRT Input Resistance
0 < V_BRT < 1.5V, EN = V_CC
200
TIMING CONTROL
Maximum On-Time
V_CC = 3.3V
2.0
Minimum Off-Time
150
ERROR AMPLIFIER
FB Threshold
V_BRT = 1.25V
192
N-CHANNEL SWITCH
LX On-Resistance
MAX1553
300
LX Current Limit
MAX1554, V_CC = 4.2V
600
SHUTDOWN CONTROL
EN Logic-Level High
1.8
EN Logic-Level Low
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
MAX
5.5
5.50
2.65
0.65
0.9
1.33
600
UNITS
V
V
mA
V
kΩ
4.8
µs
350
ns
217
mV
1.4
Ω
600
mA
1200
V
0.4
V
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