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White LED Step-Up Converter in SOT23
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
LX, OUT to GND .....................................................-0.3V to +14V
LX to OUT ...............................................................-14V to +0.3V
CTRL to GND.......................................-0.3V to +6V or (V+ + 2V)
COMP, CS to GND .......................................-0.3V to (V+ + 0.3V)
LX Current ....................................................................0.45A RMS
Continuous Power Dissipation (T A = +70°C)
8-Pin SOT23 (derate 9.7mW/°C above +70 ° C).............777mW
8-Pin Thin QFN 3mm ? 3mm (derate 24.4mW/°C
above +70 ° C)..............................................................1951mW
Operating Temperature Range ...........................-40 ° C to +85 ° C
Junction Temperature ......................................................+150 ° C
Storage Temperature Range .............................-60 ° 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.
DC ELECTRICAL CHARACTERISTICS
(V+ = 3V, V OUT = 11V, L = 33μH, C OUT = 1μF, C COMP = 0.15μF, R SENSE = 5 Ω , V CTRL = 1V, 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
V+ rising, 40mV hysteresis typical
V+ falling
Not switching, V CTRL = V CS = V+
Switching, V CTRL = V+, V CS = GND
MIN
2.6
2.15
2.10
TYP
2.38
2.34
0.25
1
MAX
5.5
2.59
2.56
0.40
2
UNITS
V
V
mA
Shutdown Supply Current
V CTRL = GND
T A = +25 ° C
T A = +85 ° C
0.3
0.3
1
μA
Overvoltage Threshold
V+ rising, 1V hysteresis typical
V+ falling
12.5
11.5
13.25
12.25
14.0
13
V
OUT Input Bias Current
V OUT = 13V
V CTRL > 0.25V
V CTRL = GND
10
20
0.01
30
1
μA
Output Voltage Range
V+ -
V DIODE
12.5
V
ERROR AMPLIFIER
CTRL to CS Regulation
V CTRL = 2V, V+ = 2.6V to 5.5V
71
75
81
mV/V
CS Input Bias Current
CTRL Input Resistance
V CS = V CTRL /13.33
450
0.01
670
1
1100
μA
k Ω
CTRL Dual Mode Threshold
CS Line Regulation
COMP Pin Resistance to Ground
COMP Output Voltage Swing
Hysteresis = 25mV typical
V+ = 2.6V to 5.5V, V CTRL = 3V
Device in shutdown or overvoltage
100
7.5
0.3
170
0.05
15
240
50
2.4
mV
%/V
k Ω
V
OSCILLATOR
Operating Frequency
Minimum Duty Cycle
PWM mode
Pulse skipping
1.0
1.2
12
0
1.5
MHz
%
Maximum Duty Cycle
V CTRL = V+, V CS = GND
85
90
97
%
2
_______________________________________________________________________________________
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