LTC3409_15 Datasheet, PDF (3/16 Pages) Linear Technology – 600mA Low VIN Buck Regulator in 3mm 3mm DFN

LTC3409
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T_A = 25°C. V_IN = 2.2V unless otherwise specified.
SYMBOL
I_S
f_OSC
SYNC TH
SYNC f_MIN
SYNC f_MAX
SYNC PW
t_SS
SYNC t_O
R_PFET
R_NFET
I_LSW
PARAMETER
Input DC Bias Current
Active Mode
Sleep Mode
Shutdown
Nominal Oscillator Frequency
SYNC Threshold
Minimum SYNC Pin Frequency
Maximum SYNC Pin Frequency
Minimum SYNC Pulse Width
Soft-Start Period
SYNC Timeout
R_DS(ON) of P-Channel FET
R_DS(ON) of N-Channel FET
SW Leakage
CONDITIONS
(Note 5)
V_OUT = 90%, I_LOAD = 0A
V_OUT = 103%, I_LOAD = 0A
V_RUN = 0V, V_IN = 5.5V
SYNC = GND
SYNC = V_IN
When SYNC Input is Toggling (Note 7)
RUN↑
Delay from Removal of EXT CLK Until Fixed
Frequency Operation Begins (Note 7)
I_SW = 100mA, Wafer Level
I_SW = 100mA, DD Package
I_SW = 100mA, Wafer Level
I_SW = 100mA, DD Package
V_RUN = 0V, V_SW = 0V or 5V, V_IN = 5V
MIN
● 0.9
● 1.8
TYP
MAX UNITS
350
475
μA
65
120
μA
0.1
1
μA
1.7
2.1
MHz
2.6
3.0
MHz
0.63
V
1
MHz
3
MHz
100
ns
1
ms
30
μs
0.33
Ω
0.35
Ω
0.22
Ω
0.25
Ω
±0.1
±3
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 LTC3409E 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. The LTC3409I is guaranteed to meet
specified performance over the full –40°C to 85°C operating temperature
range.
Note 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
LTC3409: T_J = T_A + (P_D)(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 LTC3409 is tested in a proprietary test mode that connects V_FB
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: ΔV_OVL is the amount V_FB must exceed the regulated feedback
voltage.
Note 7: Determined by design, not production tested.
3409fc
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