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High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
LX, OUT to GND .....................................................-0.3V to +30V
CTRL to GND...................-0.3V to the lower of +6V or (V IN + 2V)
COMP, CS to GND.........................................-0.3 to (V IN + 0.3V)
I LX .............................................................................................1A
Continuous Power Dissipation (T A = +70°C)
3mm x 3mm 8-Pin TDFN
(derate 24.4mW/°C above +70°C) .............................1950mW
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
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 = 3V, V OUT = 20V, C OUT = 0.1μF, C COMP = 0.15μF, R SENSE = 7.5 ? , V CTRL = 1.5V, Figure 1, T A = 0°C to +85°C , unless other-
wise noted. Typical values are at T A = +25°C.)
PARAMETER
Supply Voltage
UVLO Threshold
V IN rising or falling
CONDITIONS
MIN
2.6
2.10
TYP
2.38
MAX
5.5
2.55
UNITS
V
V
UVLO Hysteresis
40
mV
Quiescent Current
No switching
0.38
0.55
mA
Shutdown Supply Current
OVLO Threshold
CTRL = GND, V OUT = V IN
V OUT rising
T A = +25 ° C
T A = +85 ° C
26
0.3
1
27
2
29
μA
V
OVLO Hysteresis
2
V
OUT Input Bias Current
Output Voltage Range
V OUT = 26V, V CTRL > 0.24V
V OUT = V IN , CTRL = GND
(Note 1)
10
(V IN - V D1 )
20
0.01
30
1
25.5
μA
V
ERROR AMPLIFIER
CTRL to CS Regulation
CS Input Bias Current
CTRL Input Resistance
CTRL Dual-Mode Threshold
V CTRL = 1V, V IN = 2.6V to 5.5V
V CS = V CTRL /10
V CTRL ≤ 1.0V
T A = +25 ° C
T A = +85 ° C
0.095
290
100
0.100
0.01
0.03
500
170
0.105
1
780
240
V
μA
k ?
mV
CTRL Dual-Mode Hysteresis
5
mV
CTRL Shutdown Enable Delay
CS-to-COMP Transconductance
(Note 2)
V COMP = 1.0V
MAX1561
MAX1599
6.5
13.6
32
8.2
16.4
50
10.5
21.0
82
ms
μS
OSCILLATOR
Operating Frequency
Minimum Duty Cycle
Maximum Duty Cycle
MAX1561
MAX1599
PWM mode
Pulse skipping
CTRL = IN, CS = GND
0.80
0.4
91
1.0
0.5
12
0
94
1.25
0.6
MHz
%
%
2
_______________________________________________________________________________________
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