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High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
ABSOLUTE MAXIMUM RATINGS
V CC , FB, OV to GND..............................................-0.3V to +6.0V
LX to GND ..............................................................-0.3V to +45V
EN, BRT, SS to GND...................................-0.3V to (V CC + 0.3V)
I LX ...................................................................................0.9A RMS
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
Continuous Power Dissipation (T A = +70°C)
8-Pin 3mm x 3mm TDFN
(derate 24.4mW/°C above +70°C) .............................1951mW
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 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
Supply Voltage
Undervoltage Lockout Threshold
Quiescent Current
CONDITIONS
MAX1553
MAX1554
V CC rising or falling, 35mV hysteresis typical
Not switching
Switching
MIN
2.7
3.15
2.35
TYP
2.5
0.33
0.44
MAX
5.5
5.50
2.65
0.65
0.9
UNITS
V
V
mA
Shutdown Supply Current
OV Threshold
OV Input Bias Current
V EN = 0V
Rising edge
V OV = 1V
T A = +25°C
T A = +85°C
T A = +25°C
T A = +85°C
1.18
0.1
1
1.25
1
10
1
1.33
200
μA
V
nA
BRT Input Resistance
0 < V BRT < 1.5V, EN = V CC
200
400
600
k ?
TIMING CONTROL
Maximum On-Time
On-Time Constant (K)
Minimum Off-Time
V CC = 3.3V
t ON = K / V CC
2.0
150
3.4
6.3
250
4.8
350
μs
μs-V
ns
ERROR AMPLIFIER
FB Threshold
FB Input Bias Current
V BRT = 1.25V
V BRT = 3.3V
V FB = 1.0V
T A = +25°C
T A = +85°C
192
203
280
15
100
212
200
mV
nA
N-CHANNEL SWITCH
LX On-Resistance
0.8
1.4
?
2
_______________________________________________________________________________________
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