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LTC3212
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.
PARAMETER
2x Mode Output Impedance
CLK Frequency
CONDITIONS
(Notes 6, 7)
MIN
650
TYP
25
900
MAX
1275
UNITS
Ω
kHz
LEDEN
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 )
LEDEN = 3.6V
–1
3
10
1
μA
μA
t PWH
High Pulse Width
●
0.08
μs
t PWL
t SD
Low Pulse Width
Low Time to Shutdown (LEDEN = Low)
●
●
0.08
350
20
μs
μs
I SET(R,G,B)
V ISET
I ISET
864
925
985
140
mV
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.
Note 3: The LTC3212E 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 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 5: If the LTC3212 has been shut down, then the initial enable time
is longer due to the bandgap settling time and the CPO output capacitor
soft-start time.
Note 6: 1x mode output impedance is defined as (V IN – V CPO )/I OUT .
2x mode output impedance is defined as (2V IN – V CPO )/I OUT .
Note 7: Guaranteed by design.
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Time
2x Mode CPO Ripple
250
LED Pin Dropout Voltage
vs LED Pin Current
CPO
1V/DIV
3.6V
1V
1x MODE
DROPOUT
DELAY
2x MODE 5.1V
200
LED
500mV/DIV
DROPOUT
50 μ s/DIV
0V
3212 G01
V CPO
20mV/DIV
AC COUPLED
150
100
V IN = 3.6V
I CPO = 75mA
C CPO = 1 μ F
500ns/DIV
3212 G02
50
0
0
5
10
15
20
LED CURRENT (mA)
3212 G03
3212fb
 
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