LTC3215 Datasheet, PDF (3/12 Pages) Linear Technology – 700mA Low Noise High Current LED Charge Pump

LTC3215
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V, C_IN = C1 = C2 = 2.2µF, C_CPO = 4.7µF.
PARAMETER
I_SET
V_ISET
I_ISET
CONDITIONS
I_SET = 50µA
MIN TYP MAX UNITS
● 1.195 1.22 1.245
V
●
225
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Based on long-term current density limitations. Assumes an
operating duty cycle of ≤ 10% under absolute maximum conditions for
durations less than 10 seconds. Max current for continuous operation is
350mA.
Note 3: The LTC3215E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C ambient
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise specified)
I_LED Dropout Voltage
vs LED Current
0.8
V_IN = 3.6V
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
200
400
600
800
LED CURRENT (mA)
3216 G01
1x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
0.31
I_CPO = 200mA
0.29
0.27
V_IN = 3.6V
0.25
V_IN = 3.3V
V_IN = 3.9V
0.23
0.21
0.19
0.17
0.15
–40
–15
10
35
TEMPERATURE (°C)
60
85
3216 G07
I_LED Pin Current
vs I_LED Pin Voltage
600
500
400
300
200
100
I_LED = 500mA
400mA
300mA
200mA
100mA
0
0
0.2
0.4
0.6
0.8
1.0
I_LED PIN VOLTAGE (V)
3216 G02
1.5x Mode Charge Pump
Open-Loop Output Resistance
(1.5V_IN – V_CPO)/I_CPO vs Temperature
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4 ^VIN ^{= 3V}
V_CPO = 4.2V
0.2 C_IN = C1 = C2 = 2.2µF
0 ^{CCPO = 4.7µF}
–40 –15
10
35
TEMPERATURE (°C)
60
85
3216 G05
I_LED vs R_SET
1000
800
600
400
200
0
0 5 10 15 20 25 30 35 40
R_SET (kΩ)
1573 G06
2x Mode Charge Pump
Open-Loop Output Resistance
(2V_IN – V_CPO)/I_CPO vs Temperature
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
V_IN = 3V
V_CPO = 4.8V
0.2 ^CIN ^{= C1 = C2 = 2.2µF}
C_CPO = 4.7µF
0
–40 –15
10
35
60
85
TEMPERATURE (°C)
3216 G06
3215f
3