Datasheet

LTC3230
4
3230fa
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 specifi cations
from 0°C to 85°C. Specifi 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 specifi ed maximum operating junction
temperature may result in device degradation or failure.
Note 6: 1.5x mode output impedance is defi ned as (1.5V
IN
– V
CPO
)/I
OUT
. 2x
mode output impedance is defi 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
2x CPO Ripple
1x Mode Switch Resistance vs
Temperature
1.5x Mode Charge Pump Open-
Loop Output Resistance vs
Temperature (1.5V
IN
– V
CPO
)/I
CPO
CPO
2V/DIV
400μs/DIVENS = LOW
3230 G01
ENM
2V/DIV
1x
2x
1.5x
CPO
2V/DIV
400μs/DIVENS = HIGH
3230 G02
ENM
2V/DIV
1x
2x
1.5x
MODE RESET
V
CPO
20mV/DIV
AC COUPLED
400ns/DIVV
IN
= 3V
I
CPO
= 80mA
C1 = C2 = C6 = 1μF
3230 G03
V
CPO
20mV/DIV
AC COUPLED
400ns/DIVV
IN
= 3.6V
I
CPO
= 80mA
C1 = C2 = C6 = 1μF
3230 G04
TEMPERATURE (°C)
–40
RESISTANCE (Ω)
1.6
1.8
2.0
60
3230 G05
1.4
1.2
1.5
1.7
1.9
1.3
1.1
1.0
–15
10
35
85
I
CPO
= 100mA
V
IN
= 3.6V
TEMPERATURE (°C)
–40
5
RESISTANCE (Ω)
6
7
8
9
10
11
–15 10 35 60
3230 G06
85
V
IN
= 3V
V
CPO
= 4.2V
C1 = C2 = C6 = 1μF