LTC3218 Datasheet, PDF (4/12 Pages) Linear Technology – 400mA Single Wire Camera LED Charge Pump

LTC3218
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
1x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
1.8 _{ICPO = 50mA}
1.6
1.4
V_IN = 2.9V
1.2
1.0
V_IN = 4.5V
0.8
V_IN = 3.6V
0.6
0.4
0.2
0
– 40
–15 10
35
TEMPERATURE (°C)
60
85
3218 G04
Torch Mode I_LED/I_SET Current Ratio
vs I_LED Current
1400
1300
1200
1100
1000
900
800
700
600
500
400
50 60 70 80 90 100 110 120 130 140 150
I_LED CURRENT (mA)
3218 G07
2x Mode Charge Pump
Open-Loop Output Resistance
(2V_IN – V_CPO)/I_CPO vs Temperature
10
V_IN = 3.6V
9
8
7
6
5
4
3
2
1
0
– 40
–15 10
35
TEMPERATURE (°C)
60
85
3218 G05
Flash I_LED/I_SET Current Ratio
vs I_LED Current
(ENT = LOW, ENF = HIGH)
3500
3300
3100
2900
2700
2500
2300
2100
1900
1700
1500
100
150 200 250 300
I_LED CURRENT(mA)
350 400
3218 G08
Oscillator Frequency vs V_IN
1100
1080
1060
T = –40°C
1040
1020
1000
T = 25°C
T = 85°C
980
960
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_IN (V)
3218 G06
Flash I_LED/I_SET Current Ratio
vs I_LED Current
(ENT = ENF = HIGH)
4500
4300
4100
3900
3700
3500
3300
3100
2900
2700
2500
100 150 200 250 300 350 400
I_LED CURRENT(mA)
3218 G09
Torch Mode I_LED Current vs V_IN
160
140
R_SETT = 7.49k
120
100
R_SETT = 10.2k
80
60
R_SETT = 20k
40
R_SETT = 40.2k
20
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_IN (V)
3218 G10
Flash Mode I_LED Current vs V_IN
(ENT = ENF = HIGH)
450
R_SETF = 10.2k
400
350
300
250
R_SETF = 20k
200
150
R_SETF = 40.2k
100
50
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_IN (V)
3218 G11
Flash Mode I_LED Current vs V_IN
(ENT = LOW, ENF = HIGH)
450
400
R_SETF = 7.49k
350
300
R_SETF = 10.2k
250
200
R_SETF = 20k
150
100
R_SETF = 40.2k
50
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_IN (V)
3218 G12
3218fa
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