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LTC3409A Datasheet(PDF) 3 Page - Linear Technology

Part No. LTC3409A
Description  600mA Low VIN Buck Regulator in 3mm 3mm DFN
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC3409A Datasheet(HTML) 3 Page - Linear Technology

 
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LTC3409A
3
3409af
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.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VSYNCTH
SYNC Threshold
l
0.3
0.65
1.1
V
ISYNC
SYNC Leakage Current
VSYNC = 0V or = 2.2V
0.01
1
μA
IS
Input DC Bias Current
Active Mode
Sleep Mode
Shutdown
(Note 5)
VOUT = 90%, ILOAD = 0A
VOUT = 103%, ILOAD = 0A
VRUN = 0V, VIN = 5.5V
350
65
0.1
475
120
1
μA
μA
μA
fOSC
Nominal Oscillator Frequency
SYNC = GND
SYNC = VIN
l
l
0.9
1.8
1.7
2.6
2.2
3.2
MHz
MHz
SYNC TH
SYNC Threshold
When SYNC Input is Toggling (Note 7)
0.63
V
SYNC fMIN
Minimum SYNC Pin Frequency
1
MHz
SYNC fMAX
Maximum SYNC Pin Frequency
3
MHz
SYNC PW
Minimum SYNC Pulse Width
100
ns
tSS
Soft-Start Period
RUN
1ms
SYNC tO
SYNC Timeout
Delay from Removal of EXT CLK Until Fixed
Frequency Operation Begins (Note 7)
30
μs
RPFET
RDS(ON) of P-channel FET
ISW = 100mA, Wafer Level
ISW = 100mA, DD Package
0.33
0.35
Ω
Ω
RNFET
RDS(ON) of N-channel FET
ISW = 100mA, Wafer Level
ISW = 100mA, DD Package
0.22
0.25
Ω
Ω
ILSW
SW Leakage
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
±0.1
±3
μA
The
denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 2.2V unless otherwise specified.
ELECTRICAL CHARACTERISTICS


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