LTC3217_15 Datasheet, PDF (3/12 Pages) Linear Technology – 600mA Low Noise Multi-LED Camera Light Charge Pumps

LTC3217
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_BAT = 3.6V, C1 = C2 = C3 = C4 = 2.2μF, unless otherwise noted.
CPO Short Circuit Detection
Threshold Voltage
● 0.4
1.3
V
Test Current
CPO = 0V, EN1 = EN2 = Low
● 10
30
mA
Unused LED Detection
Threshold Voltage
Test Current
V_CPO – LED
LED Tied to CPO
● 0.5
●
4
1.5
V
16
μA
EN1, EN2
Low Level Input Voltage (V_IL)
High Level Input Voltage (V_IH)
Input Current (I_IH)
Input Current (I_IL)
Minimum PWM On-Time
EN2 Only
●
● 1.4
●
7
● –1
● 50
0.4
V
V
30
μA
1
μA
μs
Maximum PWM Off-Time
EN2 to Remain Enabled, EN1 = Low
●
1
ms
I_SET1, I_SET2
V_ISET1, _ISET2
I_ISET1, _ISET2 Current Range
I_ISET1, _ISET2 Short-Circuit Current
I_LED1-4 = 12.5mA
● 1.175 1.215 1.255
V
● 31.25
375
μA
800
μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based on charge pump long-term current density limitations.
Assumes an operating duty cycle of ≤10% under absolute maximum
conditions for durations less than 10 seconds. Maximum current for
continuous operation is 300mA.
Note 3: Based on LED current source long-term current density
limitations. Assumes an operating duty cycle of ≤10% under absolute
maximum conditions for durations less than 10 seconds. Maximum
current for continuous operation is 100mA.
Note 4: The LTC3217E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C ambient
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 5: 1.5x mode output impedance is defined as (1.5V_BAT – V_CPO)/I_OUT.
2x mode output impedance is defined as (2V_BAT – V_CPO)/I_OUT.
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted.
LED Dropout Voltage
vs LED Current
400
V_BAT = 3.6V
300
LED Pin Current
vs LED Pin Voltage
120
V_BAT = 3.6V
100
80
I_LED vs R_ISET
120
100
80
200
60
60
40
40
100
20
20
0
10 20 30 40 50 60 70 80 90 100
LED CURRENT (mA)
3217 G01
0
0
0.2
0.4
0.6
0.8
1.0
LED PIN VOLTAGE (V)
3217 G02
0
0 5 10 15 20 25 30 35 40 45 50
R_ISET (kΩ)
3217 G03
3217fa
3