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| LTC3215 Datasheet, PDF (4/12 Pages) Linear Technology – 700mA Low Noise High Current LED Charge Pump | |||
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LTC3215
TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25°C unless otherwise specified)
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
40
30
20
10 LED = LXCL-PWF1 LUMILED
VF = 3V TYP AT 200mA
0
2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
VIN (V)
3216 G11
Efficiency vs VIN
100
90
80
70
60
50
40
30
100mA
200mA
20
400mA
10 AOT2015 HPW 1751B
VF = 3V TYP AT 100mA
0
2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
VIN (V)
3215 G15
ISET/ILED Current Ratio
vs ILED Current
3400
3350
3300
3250
3200
25°C
85°C
â40°C
3150
3100
0
200
400
600
ILED CURRENT (mA)
800
3215 G16
1.5x Mode CPO Output Ripple
2x Mode CPO Output Ripple
Charge Pump Mode Switching
and Input Current (ILED = 400mA)
VCPO
50mV/DIV
A/C COUPLED
VIN = 3.6V
ICPO = 200mA
500ns/DIV
VCPO
20mV/DIV
A/C COUPLED
3216 G12
VIN = 3.6V
500ns/DIV
ICPO = 400mA
VCPO
1V/DIV
IVIN
500mA/
DIV
EN2
5V/DIV
3216 G13
VIN = 3V
1ms/DIV
3215 G14
3215f
4
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