LTC3208 Datasheet, PDF (5/24 Pages) Linear Technology – High Current Software Confi gurable Multidisplay LED Controller

TYPICAL PERFOR A CE CHARACTERISTICS
LED Pin Dropout Voltage
vs LED Pin Current
600 _{VBAT = 3.6V}
T_A = 25°C
500
400
300
200
100
0
10 20 30 40 50 60 70 80 90 100
LED CURRENT (mA)
3208 G04
1.5x Mode CPO Voltage
vs Load Current
4.8
4.6
4.4
4.2 _{VBAT = 3V}
4.0
3.6V
3.4V _3.5V
3.2V
3.3V
3.1V
3.8 C2 = C3 = 2.2µF
C4 = 4.7µF
3.6 ^{TA = 25°C}
0
100 200 300 400 500
LOAD CURRENT (mA)
3208 G07
Oscillator Frequency
vs Supply Voltage
940
930
920
T_A = –40°C
T_A = 25°C
910
900
890
T_A = 85°C
880
870
860
850
840
2.7 3.0 3.3 3.6 3.9 4.2 4.5
V_BAT SUPPLY VOLTAGE (V)
3208 G10
1x Mode Switch Resistance vs
Temperature
0.45
I_CPO = 200mA
0.40
V_BAT = 3.3V
V_BAT = 3.6V
0.35
V_BAT = 3.9V
0.30
0.25
–40 –15 10
35
60
85
TEMPERATURE (°C)
3208 G05
2x Mode Charge Pump Open-
Loop Output Resistance vs
Temperature (2V_BAT – V_CPO)/I_CPO
2.8
V_BAT = 3V
V_CPO = 4.8V
2.6 C2 = C3 = 2.2µF
C4 = 4.7µF
2.4
2.2
2.0
1.8
1.6
–40
–15 10
35
60
85
TEMPERATURE (°C)
3208 G08
DV_CC Shutdown Current
vs DV_CC Voltage
0.4
V_BAT = 3.6V
T_A = –40°C
0.3
T_A = 85°C
0.2
T_A = 25°C
0.1
0
2.7 3.0 3.3 3.6 3.9 4.2 4.5
DV_CC VOLTAGE (V)
3208 G11
LTC3208
1.5x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(1.5V_BAT – V_CPO)/I_CPO
2.5
V_BAT = 3V
V_CPO = 4.2V
2.3
C2 = C3 = 2.2µF
C4 = 4.7µF
2.1
1.9
1.7
1.5
–40
–15
10
35
60
85
TEMPERATURE (°C)
3208 G06
2x Mode CPO Voltage
vs Load Current
5.2
5.1
5.0
4.9
V_BAT = 3V
V_BAT = 3.1V
4.8
V_BAT = 3.2V
4.7
V_BAT = 3.3V
V_BAT = 3.4V
4.6
V_BAT = 3.5V
V_BAT = 3.6V
4.5
4.4 _{C2 = C3 = 2.2µF}
4.3 C4 = 4.7µF
4.2 ^{TA = 25°C}
0 100 200 300 400 500 600 700 800
LOAD CURRENT (mA)
3208 G09
V_BAT Shutdown Current
vs V_BAT Voltage
8.5
D_VCC = 3V
7.5
6.5
T_A = 85°C
5.5
4.5
3.5
T_A = 25°C
2.5
T_A = –40°C
1.5
2.7 3.0 3.3 3.6 3.9 4.2 4.5
V_BAT VOLTAGE (V)
3208 G12
3208fa
5