LTC3214 Datasheet, PDF (4/12 Pages) Linear Technology – 500mA Camera LED Charge Pump

LTC3214
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise specified)
Input Shutdown Current
vs Input Voltage
4.5
4.0
3.5
3.0 ^{TA = 25°C}
2.5
T_A = –40°C
T_A = 85°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)
3214 G06
Oscillator Frequency
vs Supply Voltage
910
900
T_A = –40°C
890
T_A = 25°C
880
T_A = 85°C
870
860
850
840
830
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
SUPPLY VOLTAGE (V)
3214 G07
Efficiency vs V_IN
100
100mA _200mA
90
300mA
80
70
60
50mA
50
40
30
20
10 ^{LED = AOT2015}
V_F = 2.9V TYP AT 100mA
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_IN (V)
3215 G08
I_SET/I_LED Current Ratio
vs I_LED Current
3300
3200
3100
3000
2900
25°C
85°C
–40°C
2800
2700
0
100 200 300 400 500
I_LED CURRENT (mA)
3214 G09
I_LED Current vs Input Voltage
600
500
7.15k
400
300
11.8k
200
17.4k
36.6k
100
72.2k
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_IN (V)
3214 G10
1.5x Mode CPO Output Ripple
2x Mode CPO Output Ripple
V_CPO
50mV/DIV
V_IN = 3.6V
500ns/DIV
I_CPO = 200mA
3214 G11
V_CPO
50mV/DIV
A/C COUPLED
V_IN = 3.6V
I_CPO = 400mA
500ns/DIV
3214 G12
3214fa
4