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LTC3421_15 Datasheet, PDF (3/16 Pages) Linear Technology – 3A, 3MHz Micropower Synchronous Boost Converter with Output Disconnect
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LTC3421
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, RT = 28k, unless otherwise noted.
PARAMETER
Frequency Accuracy
SYNC Input High
SYNC Input Low
SYNC Input Current
ENB Input High
ENB Input Low
ENB Input Current
SHDN Input High
SHDN Input Low
SHDN Input Current
REF Output Voltage
REF Output Current Range
Error Amp Transconductance
LBI Threshold
LBI Input Current
LBO Low Voltage
LBO Leakage
SS Current Source
BURST Threshold Voltage
CONDITIONS
VOUT = 0V (Initial Start-Up)
VOUT > 2.4V
Falling Edge
VIN = 0V, ISINK = 1mA
VIN = 0V, ISINK = 20mA
VPGOOD = 5.5V
VSS = 1V
Falling Edge
MIN TYP MAX UNITS
q 0.85
1
1.15
MHz
q 2.2
V
q
0.8
V
q
0.01
1
µA
q 1.2
V
q
0.4
V
q
1
µA
1.00
V
0.65
V
0.25
V
q
0.01
1
µA
q 1.183 1.22 1.257
V
–100
8
µA
45
µs
q 0.58
0.6
0.62
V
q
0.01
1
µA
12.0
50
mV
0.25
0.5
V
0.01
1
µA
1.2
2.4
5
µA
0.87 0.97 1.07
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3421E 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 VOUTS pin since the supply current is
bootstrapped to the output. The current will reflect to the input supply by
(VOUT/VIN) • Efficiency. The outputs are not switching.
Note 4: Once VOUT is greater than 2.4V, the IC is not dependent on the VIN
supply.
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 impair device reliability.
3421f
3
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