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LTC3409A Datasheet, PDF (3/16 Pages) Linear Technology – 600mA Low VIN Buck Regulator in 3mm × 3mm DFN
LTC3409A
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 2.2V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
VSYNCTH
ISYNC
IS
fOSC
SYNC TH
SYNC Threshold
SYNC Leakage Current
Input DC Bias Current
Active Mode
Sleep Mode
Shutdown
Nominal Oscillator Frequency
SYNC Threshold
VSYNC = 0V or = 2.2V
(Note 5)
VOUT = 90%, ILOAD = 0A
VOUT = 103%, ILOAD = 0A
VRUN = 0V, VIN = 5.5V
SYNC = GND
SYNC = VIN
When SYNC Input is Toggling (Note 7)
l 0.3
0.65
1.1
0.01
1
350
475
65
120
0.1
1
l 0.9
1.7
2.2
l 1.8
2.6
3.2
0.63
SYNC fMIN Minimum SYNC Pin Frequency
1
SYNC fMAX Maximum SYNC Pin Frequency
3
SYNC PW Minimum SYNC Pulse Width
100
tSS
Soft-Start Period
RUN↑
1
SYNC tO
SYNC Timeout
Delay from Removal of EXT CLK Until Fixed
30
Frequency Operation Begins (Note 7)
RPFET
RNFET
ILSW
RDS(ON) of P-channel FET
RDS(ON) of N-channel FET
SW Leakage
ISW = 100mA, Wafer Level
ISW = 100mA, DD Package
ISW = 100mA, Wafer Level
ISW = 100mA, DD Package
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
0.33
0.35
0.22
0.25
±0.1
±3
UNITS
V
μA
μA
μA
μA
MHz
MHz
V
MHz
MHz
ns
ms
μs
Ω
Ω
Ω
Ω
μA
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 LTC3409AE is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3409AI is guaranteed to meet
specified performance over the full –40°C to 85°C operating temperature
range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC3409A: TJ = TA + (PD)(43°C/W)
This IC includes overtemperature protection that is intended to protect the
device during momentary overload conditions. Overtemperature protection
becomes active at a junction temperature greater than the maximum
operating junction temperature. Continuous operation above the specified
maximum operating junction temperature may impair device reliability.
Note 4: The LTC3409A is tested in a proprietary test mode that connects
VFB to the output of the error amplifier.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: ΔVOVL is the amount VFB must exceed the regulated feedback
voltage.
Note 7: Determined by design, not production tested.
Note 8: Guaranteed by measurement at the wafer level and design,
characterization and correlation with statistical process controls.
3409af
3