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| LTC3216 Datasheet, PDF (4/12 Pages) Linear Technology – 1A Low Noise High Current LED Charge Pump with Independent Torch/Flash Current Control | |||
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LTC3216
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Input Shutdown Current
vs Input Voltage
4.0
3.5
TA = 25°C
3.0
TA = 85°C
2.5
TA = â40°C
2.0
1.5
1.0
0.5
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
INPUT VOLTAGE (V)
3216 G04
Oscillator Frequency
vs Supply Voltage
930
920
910
TA = 25°C
900
TA = â40°C
890
880
TA = 85°C
870
860
850
840
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
SUPPLY VOLTAGE (V)
3216 G03
Efficiency vs VIN
100
90
80
200mA
70
400mA
600mA
60
50
ILED = 800mA
40
30
20
10
LED = LXCL-PWF1 LUMILEDS
0
2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
VIN (V)
3216 G11
ISET/ILED Current Ratio vs ILED
Current
3400
1.5x Mode CPO Output Ripple
3350
3300
3250
3200
TA = â40°C
TA = 25°C
TA = 85°C
VCPO
50mV/DIV
A/C COUPLED
3150
3100
0 100 200 300 400 500 600 700 800 900
ILED CURRENT(mA)
3216 G15
2x Mode CPO Output Ripple
VIN = 3.6V
ICPO = 200mA
500ns/DIV
3216 G12
Charge Pump Mode Switching
and Input Current
VCPO
20mV/DIV
A/C COUPLED
VIN = 3.6V
ICPO = 400mA
500ns/DIV
3216 G13
VCPO
1V/DIV
IVIN
500mA/DIV
EN2
5V/DIV
VIN = 3V
1ms/DIV
3216 G14
3216fa
4
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