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High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
ELECTRICAL CHARACTERISTICS (continued)
(V V+ = +3.0V, V OUT1 = +20V, L1 = 22μH, C OUT = 0.1μF, C COMP = 0.022μF, R SENSE = 7.5 Ω , V CTRL = +1.5V, EN1 = EN2 = V+, T A =
-40°C to +85°C , unless otherwise noted.) (Notes 1, 3)
PARAMETER
Maximum Duty Cycle
CONDITIONS
CTRL = V+, CS = GND
MIN
91
MAX
UNITS
%
N-CHANNEL SWITCH
LX On-Resistance
2.25
Ω
LX Current Limit
Duty cycle = 90%
450
950
mA
Note 1: Limits are 100% production tested at T A = +25°C for UCSP parts. Limits over the entire operating temperature range are
guaranteed by design and characterization but are not production tested.
Note 2: The minimum output voltage is the input voltage minus the forward voltage drop of the Schottky diode:
V OUT(MIN) = V V+ - V DIODE
Note 3: Specifications to -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(See the Typical Applications Circuit , V V+ = V VP = 3.6V, I LED = 15mA, L1 = 22μH, C OUT1 = 0.1μF, C COMP = 0.022μF, R SENSE = 7.5 Ω ,
V CTRL = 1.5V, 4 LEDs, T A = +25°C, unless otherwise noted.)
100
EFFICIENCY vs. LED CURRENT
(vs. NUMBER of LEDs)
100
EFFICIENCY vs. LED CURRENT
(vs. INPUT VOLTAGE)
100
EFFICIENCY vs. LED CURRENT
(vs. INDUCTANCE)
90
6 LEDs
90
2.7 V IN
90
10 μ H
22 μ H
80
80
80
70
60
4 LEDs
2 LEDs
70
60
4.2 V IN
3.6 V IN
70
60
47 μ H
4.7 μ H
50
40
50
40
50
40
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
40
35
30
25
20
15
LED CURRENT (mA)
INPUT RIPPLE vs. INDUCTANCE
6
5
4
3
2
LED CURRENT (mA)
INPUT RIPPLE SPECTRUM
25
20
15
10
LED CURRENT (mA)
LED CURRENT vs. DIRECT-PWM
DIMMING DUTY CYCLE
10
5
1
5
V CTRL = SQUARE WAVE
200Hz < FREQ < 200kHz
0
0
0
0
5
10 15 20 25 30 35 40 45 50
0
1
2
3
4
5
6
7
8
9
10
0
10 20 30 40 50 60 70 80 90 100
INDUCTANCE ( μ H)
FREQUENCY (MHz)
DIRECT-PWM DIMMING DUTY CYCLE (%)
4
_______________________________________________________________________________________
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