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LTC3218
ELECTRICAL CHARACTERISTICS The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C, V IN = 3.6V, C IN = C FLY = 2.2 μ F, C CPO = 4.7 μ F, ENF = HIGH, unless
otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Charge Pump (CPO)
Charge Pump Output Clamp Voltage
1:1 Mode Output Impedance
1:2 Mode Output Impedance
CLK Frequency
CPO Short Circuit Detection
5.3
1.3
7
1
V
Ω
Ω
MHz
Threshold Voltage
Test Current
ENT = HIGH
ENT = ENF = LOW, V CPO = 0V
●
●
0.6
20
1.5
50
V
mA
ENF, ENT
High Level Input Voltage (V IH )
Low Level Input Voltage (V IL )
●
●
1.4
0.4
V
V
Input Current (I IH )
Input Current (I IL )
Flash Timeout
V EN = 3.6V
V EN = 0V
ENF = HIGH
●
●
–1
14.4
2
30
1
μA
μA
s
ISETF, ISETT
V ISET
I ISET
I SET = 110μA
ENT = LOW, ENF = HIGH
●
●
1.18
1.21
1.24
181
V
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 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 150mA.
Note 3: The LTC3218E is guaranteed to meet performance speci?cations
from 0°C to 85°C. Speci?cations over the –40°C to 85°C ambient
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C, unless otherwise noted.
I LED Dropout Voltage
vs LED Current
I LED vs R SET
V IN Shutdown Current vs V IN
0.009
0.008
450
400
TORCH
FLASH (ENT = LOW,
3.0
T = 25°C
ENF = HIGH)
2.5
0.007
0.006
0.005
0.004
0.003
0.002
0.001
350
300
250
200
150
100
50
FLASH (ENT = ENF = HIGH)
2.0
1.5
1.0
0.5
T = –40°C
T = 85°C
0
0
100
200
300
400
0
0
50
100
150
200
250
300
350
0
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
4.5
LED CURRENT (mA)
3218 G01
R SET (kΩ)
3218 G02
V IN (V)
3218 G03
3218fb
3
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