LTC3205
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C. V IN = 3.6V, DV CC = 1.8V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Charge Pump (CPO)
1:1 Mode Output Impedance
0.8
?
2:3 Mode Output Impedance
CPO Regulation Voltage
V IN = 3V, V CPO = 4.2V (Note 3)
I CPO = 20mA, 2:3 Mode
2.5
4.7
?
V
CLK Frequency
0.6
0.8
1.1
MHz
D IN , SCLK, LD, STEPUP, ENRGB
V IL
V IH
Low Level Input Voltage
High Level Input Voltage
q
q 0.85 ? DV CC
0.15 ? DV CC
V
V
I IH
I IL
Input Current
Input Current
D IN , SCLK, LD, STEPUP, ENRGB = DV CC
D IN , SCLK, LD, STEPUP, ENRGB = 0V
q
q
–1
–1
1
1
μ A
μ A
Serial Port Timing
t DS
t DH
t L
t H
t LW
t CL
t LC
D IN Valid to SCLK Setup
D IN Valid to SCLK Hold
SCLK Low Time
SCLK High Time
LD Pulse Width
SCLK to LD
LD to SCLK
35
35
35
35
35
35
0
ns
ns
ns
ns
ns
ns
ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 3: 2:3 mode output impedance is defined as (1.5V IN – V CPO )/I CPO .
Note 4: Based on long term current density limitations.
Note 2: The LTC3205E is guaranteed to meet performance specifications
from 0 ° C to 70 ° C. Specifications over the –40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
I LED
3mA/DIV
(100%
SETTING)
LED Pin Sink Current
vs LED Pin Voltage
V IN
AC COUPLED
(20mV/DIV)
V OUT
AC COUPLED
Input and Output
Charge Pump Noise
100
90
80
70
60
50
4-LED Main Panel Efficiency
vs Input Voltage
0mA
(50mV/DIV)
40
30
FOUR LEDs AT 15mA/LED
200mV/DIV
3205 G01
I CPO = 150mA 500ns/DIV
V IN = 3.6V
C IN = C CPO = 0.7 μ F
3205 G02
20
0
10 (TYP V F AT 15mA = 3.2V)
T A = 25 ° C
3.0 3.3 3.6
3.9
4.2
INPUT VOLTAGE (V)
3205 TA01b
3205f
3
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