LTC3212 Datasheet, PDF (3/12 Pages) Linear Technology – RGB LED Driver and Charge Pump

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
CONDITIONS
MIN TYP MAX UNITS
2x Mode Output Impedance
(Notes 6, 7)
25
Ω
CLK Frequency
650
900 1275
kHz
LEDEN
High Level Input Voltage (V_IH)
Low Level Input Voltage (V_IL)
Input Current (I_IH)
LEDEN = 3.6V
l 1.4
V
l
0.4
V
3
10
µA
Input Current (I_IL)
t_PWH
t_PWL
t_SD
I_SET(R,G,B)
V_ISET
I_ISET
High Pulse Width
Low Pulse Width
Low Time to Shutdown (LEDEN = Low)
–1
l 0.08
l 0.08
l 350
1
µA
µs
20
µs
µs
864
925
985
mV
140
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
CPO
1V/DIV
3.6V
1V
LED
500mV/DIV
1x MODE
DROPOUT
DELAY
DROPOUT
2x MODE 5.1V
0V
50µs/DIV
3212 G01
V_CPO
20mV/DIV
AC COUPLED
V_IN = 3.6V
I_CPO = 75mA
C_CPO = 1µF
500ns/DIV
LED Pin Dropout Voltage
vs LED Pin Current
250
200
150
100
3212 G02
50
0
0
5
10
15
LED CURRENT (mA)
20
3212 G03
3212fb