LTC3215 Linear Technology, LTC3215 Datasheet - Page 4

• Manufacturer Part Number: LTC3215
• Description: 700mA Low Noise High Current LED Charge Pump
• Manufacturer: Linear Technology

LTC3215
A/C COUPLED
TYPICAL PERFOR A CE CHARACTERISTICS
4
50mV/DIV
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.9
Input Shutdown Current
vs Input Voltage
V
CPO
3.1
T
V
I
1.5x Mode CPO Output Ripple
CPO
A
IN
= 85°C
3.3
= 3.6V
= 200mA
INPUT VOLTAGE (V)
3.5
100
T
90
80
70
60
50
40
30
20
10
A
0
2.8
= 25°C
Efficiency vs V
3.7
AOT2015 HPW 1751B
V
F
500ns/DIV
3.0
T
= 3V TYP AT 100mA
A
100mA
200mA
400mA
3.9
= –40°C
3.2
4.1
W
3.4
4.3
3216 G04
IN
V
IN
3.6
U
4.5
(V)
3216 G12
3.8
4.0
A/C COUPLED
930
920
910
900
890
880
870
860
850
840
20mV/DIV
4.2
2.9
3215 G15
Oscillator Frequency
vs Supply Voltage
V
CPO
4.4
3.1
T
A
V
I
2x Mode CPO Output Ripple
CPO
= –40°C
IN
3.3
= 3.6V
= 400mA
SUPPLY VOLTAGE (V)
T
A
3.5
= 25°C
3.7
T
500ns/DIV
A
= 85°C
3.9
3400
3300
3250
3150
3100
3350
3200
4.1
0
I
vs I
SET
4.3
3216 G03
(T
LED
/I
A
LED
4.5
= 25°C unless otherwise specified)
3216 G13
Current
200
Current Ratio
85°C
I
LED
25°C
500mA/
CURRENT (mA)
100
1V/DIV
5V/DIV
90
80
70
60
50
40
30
20
10
V
0
400
EN2
CPO
I
DIV
2.8
VIN
Efficiency vs V
LED = LXCL-PWF1 LUMILED
V
–40°C
F
Charge Pump Mode Switching
and Input Current (I
V
= 3V TYP AT 200mA
3.0
IN
= 3V
600
3.2
200mA
3.4
3215 G16
IN
V
IN
800
3.6
1ms/DIV
(V)
400mA
3.8
LED
600mA
4.0
= 400mA)
4.2
3216 G11
3215 G14
3215f
4.4