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1MHz PWM Boost Converter for 1.5A
White LED Camera Flash
ELECTRICAL CHARACTERISTICS (continued)
(V EN1 = V EN2 = 5V, V OUT = V OUTS = 4V, C OUT = 10μF, T A = -40°C to +85°C. Typical values are at T A = +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
COMP Input Resistance to GND
CONDITIONS
During shutdown or UVLO
MIN
TYP
140
MAX
250
UNITS
?
LED T A Derating Function Threshold
LED T A Derating Function Slope
EN1 and EN2 Logic-High Input Voltage
EN1 and EN2 Logic-Low Input Voltage
Temperature when the LED current derating
function begins
T A = +40°C to +85°C
V OUTS = 2.7V to 5.5V
V OUTS = 2.7V to 5.5V
1.4
+40
-1.67
0.4
°C
%/°C
V
V
EN1 and EN2 Logic Input Bias Current
LX n-Channel On-Resistance
LX p-Channel On-Resistance
LX Leakage
Operating Frequency
Maximum Duty Cycle
Minimum Duty Cycle
V EN_ = 5.5V
I LX = 200mA
I LX = 200mA
V LX = 5.5V
T A = +25°C
T A = +85°C
T A = +25°C
T A = +85°C
0.8
65
0.01
0.03
50
100
0.01
0.03
1.0
75
4
1
100
200
1
1.2
8
μA
m ?
m ?
μA
MHz
%
%
Note 1: All devices are production tested at T A = +25°C. Specifications over temperature are guaranteed by design and characteri-
zation and not production tested.
Note 2: For temperatures below the thermal derating start point.
Typical Operating Characteristics
(Circuit of Figure 2, V IN = V EN1 = 3.6V, V EN2 = 0V, T A = +25°C, unless otherwise noted.)
4000
FLASH-MODE BATTERY CURRENT
vs. INPUT VOLTAGE
600
MOVIE-MODE BATTERY CURRENT
vs. INPUT VOLTAGE
100
BOOST CONVERTER EFFICIENCY
vs. LOAD CURRENT (DISCO MODE)
3500
3000
2500
2000
1500
1000
500
R FLSH = 2k ?
R FLSH = 3.01k?
R FLSH = 4.02k?
R FLSH = 8.06k?
500
400
300
200
100
R MOV = 2.00k?
R MOV = 3.57k?
R MOV = 6.49k?
98
96
94
92
90
88
86
84
82
INCLUDES 83mA LED CURRENT
0
0
80
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
10
100
1000
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
_______________________________________________________________________________________
3
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