LTC3230_15 Datasheet, PDF (4/16 Pages) Linear Technology – 5-LED Main/Sub Display Driver with Dual LDO

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 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 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 specified maximum operating junction
temperature may result in device degradation or failure.
Note 6: 1.5x mode output impedance is defined as (1.5V_IN – V_CPO)/I_OUT. 2x
mode output impedance is defined 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
CPO
2V/DIV
1.5x
2x
1x
ENM
2V/DIV
ENS = LOW 400μs/DIV
3230 G01
Dropout Time when Enabled
1.5x CPO Ripple
1.5x
2x
CPO
1x
2V/DIV
ENM
2V/DIV
MODE RESET
V_CPO
20mV/DIV
AC COUPLED
ENS = HIGH 400μs/DIV
3230 G02
V_IN = 3V
400ns/DIV
I_CPO = 80mA
C1 = C2 = C6 = 1μF
3230 G03
2x CPO Ripple
V_CPO
20mV/DIV
AC COUPLED
V_IN = 3.6V
400ns/DIV
I_CPO = 80mA
C1 = C2 = C6 = 1μF
3230 G04
1x Mode Switch Resistance vs
Temperature
2.0
I_CPO = 100mA
1.9 V_IN = 3.6V
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
–40 –15 10
35
60
85
TEMPERATURE (°C)
3230 G05
1.5x Mode Charge Pump Open-
Loop Output Resistance vs
Temperature (1.5V_IN – V_CPO)/I_CPO
11
V_IN = 3V
V_CPO = 4.2V
10 C1 = C2 = C6 = 1μF
9
8
7
6
5
–40
–15 10
35
60
85
TEMPERATURE (°C)
3230 G06
3230fa
4