LTC3217_15 Datasheet, PDF (4/12 Pages) Linear Technology – 600mA Low Noise Multi-LED Camera Light Charge Pumps

LTC3217
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted.
1x Mode Switch Resistance
vs Temperature
0.65
I_CPO = 200mA
0.60
0.55
V_BAT = 3.6V
0.50
V_BAT = 3.3V
0.45
V_BAT = 3.9V
0.40
0.35
–40
–15
10
35
60
85
TEMPERATURE (°C)
3217 G04
1.5x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(1.5V_BAT – V_CPO)/I_CPO
3.2
V_BAT = 3V
V_CPO = 4.2V
3.0 C2 = C3 = C4 = 2.2μF
2.8
2.6
2.4
2.2
2.0
–40
–15 10
35
60
85
TEMPERATURE (°C)
3217 G05
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(2V_BAT – V_CPO)/I_CPO
3.8
V_BAT = 3V
V_CPO = 4.8V
3.6 C2 = C3 = C4 = 2.2μF
3.4
3.2
3.0
2.8
2.6
–40
–15 10
35
60
85
TEMPERATURE (°C)
3217 G06
V_BAT Shutdown Current
vs V_BAT Voltage
7.5
6.5
T_A = –40°C
5.5
T_A = 85°C
4.5
3.5
T_A = 25°C
2.5
1.5
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_BAT VOLTAGE (V)
3217 G07
1.5x Mode CPO Output Ripple
Oscillator Frequency
vs Supply Voltage
980
970
960
950
T_A = 25°C
940
T_A = –40°C
930
T_A = 85°C
920
910
900
890
880
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_BAT SUPPLY VOLTAGE (V)
3217 G08
2x Mode CPO Output Ripple
Efficiency vs V_BAT
100
90 ^{100mA 200mA}
80
400mA
70
60
50
40
30
20
TOTAL OUTPUT CURRENT
10 P_LED/PIN
LED = 2015 HPW AOT
0
3 3.2 3.4 3.6 3.8 4
V_BAT (V)
4.2 4.4
3217 G09
Charge Pump Mode Switching
and Input Current to Ground
(400mA Load)
V_CPO 1x
1V/DIV NO LOAD _1x
2x
1.5x
(5V)
V_CPO
50mV/DIV
AC-COUPLED
V_CPO
20mV/DIV
AC-COUPLED
I_VBAT
500mA/DIV
0
EN1
5V/DIV
DROPOUT
DROPOUT
V_BAT = 3.6V
I_CPO = 400mA
C_CPO = 2.2μF
500ns/DIV
3217 G10
V_BAT = 3.6V
I_CPO = 400mA
C_CPO = 2.2μF
500ns/DIV
3217 G11
V_IN = 3.6V
1ms/DIV
3217 G12
3217fa
4