Datasheet

LTC3215
4
3215fc
TYPICAL PERFORMANCE CHARACTERISTICS
Input Shutdown Current
vs Input Voltage
Oscillator Frequency
vs Supply Voltage Efficiency vs V
IN
1.5x Mode CPO Output Ripple 2x Mode CPO Output Ripple
1x Mode Charge Pump Open-
Loop Output Resistance vs
Temperature
1.5x Mode Charge Pump
Open-Loop Output Resistance (1.5
V-
IN
– V
CPO
)/I
CPO
vs Temperature
2x Mode Charge Pump
Open-Loop Output Resistance
(2V
IN
– V
CPO
)/I
CPO
vs Temperature
TEMPERATURE (°C)
–40
OUTPUT RESISTANCE (Ω)
35
85
3216 G04
–15 10 60
0.31
0.29
0.27
0.25
0.23
0.21
0.19
0.17
0.15
I
CPO
= 200mA
V
IN
= 3.6V
V
IN
= 3.3V
V
IN
= 3.9V
TEMPERATURE (°C)
–40
OUTPUT RESISTANCE (Ω)
10
60
85
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3216 G05
–15 35
V
IN
= 3V
V
CPO
= 4.2V
C
IN
= C1 = C2 = 2.2µF
C
CPO
= 4.7µF
–40
10
60
85
–15 35
TEMPERATURE (°C)
OUTPUT RESISTANCE (Ω)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3216 G06
V
IN
= 3V
V
CPO
= 4.8V
C
IN
= C1 = C2 = 2.2µF
C
CPO
= 4.7µF
(T
A
= 25°C unless otherwise specified)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
INPUT SHUTDOWN CURRENT (µA)
3216 G07
INPUT VOLTAGE (V)
2.9 4.5
3.3
3.7
4.13.1 3.5 3.9
4.3
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
FREQUENCY (kHz)
930
920
910
900
890
880
870
860
850
840
3216 G08
SUPPLY VOLTAGE (V)
2.9 4.5
3.3
3.7
4.1
3.1 3.5 3.9
4.3
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
V
IN
(V)
2.8
EFFICIENCY (P
LED
/P
IN
) (%)
100
90
80
70
60
50
40
30
20
10
0
3.2
3.6
3.8
3216 G09
3.0 3.4
4.0
4.2
4.4
LED = LXCL-PWF1 LUMILEDS
V
F
= 3V TYP AT 200mA
600mA
400mA
200mA
3216 G10
V
CPO
50mV/DIV
A/C COUPLED
500ns/DIVV
IN
= 3.6V
I
CPO
= 200mA
3216 G11
V
CPO
20mV/DIV
A/C COUPLED
500ns/DIVV
IN
= 3.6V
I
CPO
= 400mA