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LTC3230
ELECTRICAL CHARACTERISTICS
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 125mA.
Note 3: Based on long-term current density limitations. LD01 and LD02
have short circuit protection which limits current to no more than 750mA.
Assumes an operating short circuit duty cycle less than 3% for durations
less than 10 seconds.
Note 4: The LTC3230 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.
Note 5: 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 speci?ed maximum operating junction
temperature may result in device degradation or failure.
Note 6: 1.5x mode output impedance is de?ned as (1.5V IN – V CPO )/I OUT . 2x
mode output impedance is de?ned as (2V IN – V CPO )/I OUT .
Note 7: If the part has been shut down then the initial enable time is about
100μs longer due to the bandgap start-up and charge pump soft-start
times.
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C unless otherwise noted.
Dropout Time from Enable
Dropout Time when Enabled
1.5x CPO Ripple
CPO
1x
1.5x
2x
CPO
2V/DIV
1x
1.5x
2x
2V/DIV
MODE RESET
V CPO
20mV/DIV
AC COUPLED
ENM
2V/DIV
ENM
2V/DIV
ENS = LOW
400 μ s/DIV
3230 G01
ENS = HIGH
400 μ s/DIV
3230 G02
V IN = 3V
400ns/DIV
3230 G03
I CPO = 80mA
C1 = C2 = C6 = 1 μ F
1.5x Mode Charge Pump Open-
1x Mode Switch Resistance vs
Loop Output Resistance vs
2x CPO Ripple
Temperature
Temperature (1.5V IN – V CPO )/I CPO
2.0
I CPO = 100mA
1.9 V IN = 3.6V
1.8
11
10
V IN = 3V
V CPO = 4.2V
C1 = C2 = C6 = 1 μ F
V CPO
20mV/DIV
AC COUPLED
1.7
1.6
1.5
1.4
1.3
9
8
7
V IN = 3.6V
400ns/DIV
3230 G04
1.2
6
I CPO = 80mA
C1 = C2 = C6 = 1 μ F
1.1
1.0
–40
–15
10
35
60
85
5
–40
–15
10 35
60
85
TEMPERATURE ( ° C)
3230 G05
TEMPERATURE ( ° C)
3230 G06
3230fa
4
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