LTC3427_15 Datasheet, PDF (3/12 Pages) Linear Technology – 500mA, 1.25MHz Synchronous Step-Up DC/DC Converter in 2mm 2mm DFN Package

LTC3427
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: The LTC3427E 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.
Note 3: Current is measured into the V_OUT pin since the supply current is
bootstrapped to the output. The current will reflect to the input supply by:
(V_OUT/V_IN) • Efficiency. The outputs are not switching.
Note 4: Specification is guaranteed by design and not 100% tested in
production.
Note 5: The LTC3427 includes an overtemperature shutdown that is
intended to protect the device during momentary overload conditions.
Junction temperature will exceed 125°C when the overtemperature
shutdown is active. Continuous operation above the specified maximum
operating junction temperature may impair device reliability.
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise specified.
2-Cell Alkaline to 3.3V Efficiency
100
95
V_IN = 3.1V
90
85 ^{VIN = 2.4V}
80
V_IN = 1.8V
75
70
65
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
3427 G01
Inrush Current Control
Li-Ion to 5V Efficiency
100
95
V_IN = 4.2V
90
V_IN = 3.6V
85
80
75
V_IN = 3.1V
70
65
60
55
50
1
10
100
LOAD CURRENT (mA)
1000
3427 G02
Load Transient Response
V_OUT
1V/DIV
INDUCTOR
CURRENT
100mA/DIV
SHDN
5V/DIV
V_IN = 2.4V
C_OUT = 22µF
L = 4.7µH
500µs/DIV
V_OUT
100mV/DIV
AC COUPLED
I_OUT
40mA
TO 100mA
3427 G04
V_IN = 1.8V
V_OUT = 3.3V
C_OUT = 4.7µF
L = 4.7µH
100µs/DIV
3427 G05
2-Cell Alkaline to 5V Efficiency
100
95
90
V_IN = 3.2V
85
V_IN = 2.4V
80
75
70
V_IN = 1.8V
65
60
55
50
1
10
100
1000
LOAD CURRENT (mA)
3427 G03
V_OUT Ripple, AC Coupled
I_LOAD
100mA
I_LOAD
50mA
I_LOAD
10mA
V_IN = 2.4V
V_OUT = 3.3V
L = 4.7µH
C_IN = 2.2µF
C_OUT = 4.7µF
500ns/DIV
3427 G13
3427fa
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