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| LTC3606B_15 Datasheet, PDF (3/20 Pages) Linear Technology – 800mA Synchronous Step-Down DC/DC with Average Input Current Limit | |||
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LTC3606B
ELECTRICAL CHARACTERISTICS The l denotes the speciï¬cations which apply over the full operating
junction temperature range, otherwise speciï¬cations are at TA = 25°C, VIN = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VIN
VIN Operating Voltage Range
l
VUV
VIN Undervoltage Lockout
VIN Low to High
l
IFB
Feedback Pin Input Current
l
VFBREG
VLINEREG
Feedback Voltage
VFB Line Regulation
LTC3606BE, â40°C < TJ < 85°C (Note 7) l
LTC3606BI, â40°C < TJ < 125°C (Note 7) l
VIN = 2.5V to 5.5V (Note 7)
VLOADREG
VFB Load Regulation
ILOAD = 0mA to 800mA (Note 7)
IS
Supply Current
Active Mode (Note 4)
Shutdown
VFB = 0.95 Ã VFBREG
VRUN = 0V, VIN = 5.5V
fOSC
Oscillator Frequency
VFB = VFBREG
l
ILIM(PEAK)
Peak Switch Current Limit
VIN = 5V, VFB < VFBREG, Duty Cycle <35%
IINLIM
Input Average Current Limit
RLIM = 116k
RLIM = 116k, LTC3606BE
l
RLIM = 116k, LTC3606BI
l
RDS(ON)
ISW(LKG)
Main Switch On-Resistance (Note 5)
VIN = 5V, ISW = 100mA
Synchronous Switch On-Resistance (Note 5) VIN = 5V, ISW = 100mA
Switch Leakage Current
VIN = 5V, VRUN = 0V
tSOFTSTART
Soft-Start Time
VFB from 0.06V to 0.54V
VRUN
RUN Threshold High
l
IRUN
RUN Leakage Current
0V ⤠VRUN ⤠5V
l
PGOOD
Power Good Threshold
PGOOD Blanking Power Good Blanking Time
Entering Window
VFB Ramping Up
VFB Ramping Down
Leaving Window
VFB Ramping Up
VFB Ramping Down
PGOOD Rising and Falling, VIN = 5V
RPGOOD
Power Good Pull-Down On-Resistance
IPGOOD
PGOOD Leakage Current
VPGOOD = 5V
MIN
2.5
0.588
0.582
1.8
1800
450
437
427
0.3
0.4
â5
5
8
TYP
2.1
0.600
0.600
0.01
0.5
420
2.25
2400
475
475
475
0.27
0.25
0.01
0.95
1
0.01
â7
7
9
â9
90
15
MAX
5.5
2.5
±30
0.612
0.618
0.25
650
1
2.7
500
513
523
1
1.3
1.2
1
11
â11
30
±1
UNITS
V
V
nA
V
V
%/V
%
μA
μA
MHz
mA
mA
mA
mA
Ω
Ω
μA
ms
V
μA
%
%
%
%
μs
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: Guaranteed by long term current density limitations.
Note 3: The LTC3606BE is guaranteed to meet performance speciï¬cations
from 0°C to 85°C. Speciï¬cations over the â40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3606BI is guaranteed
to meet speciï¬ed performance over the full â40°C to 125°C operating
junction temperature range.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: The switch on-resistance is guaranteed by correlation to wafer
level measurements.
Note 6: 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 speciï¬ed maximum operating junction
temperature may impair device reliability.
Note 7: The converter is tested in a proprietary test mode that connects
the output of the error ampliï¬er to the SW pin, which is connected to an
external servo loop.
Note 8: TJ is calculated from the ambient temperature TA and the power
dissipation as follows: TJ = TA + (PD)(θJA°C/W)
3606bfb
3
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