Rainbow Electronics MAX1554 - Manual (Page 3)

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