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Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +7V
CS, COMP, ON to GND ...............................-0.3V to (V IN + 0.3V)
OVP, LX to GND .....................................................-0.3V to +28V
PGND to GND .......................................................-0.3V to +0.3V
LX Current ..................................................................770mA 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
Soldering Temperature (reflow) .......................................+260°C
Continuous Power Dissipation (multilayer board at +70°C)
8-pin, 2mm x 2mm TDFN
(derate above +70°C by 11.9mW/°C) ..........................953mW
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 IN = V ON = V OVP = 3.6V, V PGND = V GND = 0V, COMP, CS, and LX are unconnected, T A = -40°C to +85°C, unless otherwise noted.
Typical values are at T A = +25°C.) (Note 1)
PARAMETER
Input Voltage
Input Undervoltage Lockout
Threshold
SYMBOL
V IN
V IN_UVLO
V IN rising
CONDITIONS
MIN
2.6
2.25
TYP
MAX
5.5
2.55
UNITS
V
V
V IN falling
2.53
Input Overvoltage Lockout
Threshold
V IN_OVLO
V IN rising
V IN falling
6.2
6.0
6.35
6.3
V
Shutdown Input Current
Quiescent Current
I SHDN
I Q
V ON = 0V
V CS = 0.55V, no load
(not switching)
T A = +25 ° C
T A = +85 ° C
MAX8901A
MAX8901B
0.01
0.1
70
115
1
135
185
μA
μA
Output Voltage Range
V OUT
V DIODE = external boost diode voltage drop
V IN -
V DIODE
V OV
V
OVP Overvoltage Protection
Threshold
OVP Input Current
CS Regulation Voltage
ON Shutdown Delay
V OV
I OV
V CS
t SHDN
6 LEDs with 25V OVP option
VOVP = 20V
No dimming
Time V ON is below low threshold until
shutdown (Figure 1)
24
0.475
1.18
25
20
0.50
1.33
26
0.525
1.50
V
μA
V
ms
ON High Voltage
ON Low Voltage
V ON_HI
V ON_LO
2.6V < V IN < 5.5V
2.6V < V IN < 5.5V
1.3
0.4
V
V
ON Input Current
I ON
ON = IN
T A = +25 ° C
T A = +85 ° C
0.01
0.1
1
μA
Initial ON High Pulse Width
ON High Pulse Width
t HI_INIT
t HI
First ON high pulse to enable IC
(MAX8901B) (Figure 1)
MAX8901B (Figure 1)
40
0.5
μs
μs
ON Low Pulse Width
t LO
MAX8901B (Figure 1)
0.5
500.0
μs
2
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