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LTC3548EDD-1-PBF Datasheet(PDF) 3 Page - Linear Technology

Part # LTC3548EDD-1-PBF
Description  Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3548EDD-1-PBF Datasheet(HTML) 3 Page - Linear Technology

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LTC3548-1
3
35481fb
ELECTRICAL CHARACTERISTICS
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 LTC3548-1 is guaranteed to meet specified performance
from 0°C to 85°C. Specifications over the – 40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC3548-1 is tested in a proprietary test mode that connects
the output of the error amplifier to an outside servo-loop.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: TJ is calculated from the ambient TA and power dissipation PD
according to the following formula: TJ = TA + (PD • θJA).
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Operating Voltage Range
2.5
5.5
V
VOUT1
Output Voltage
0°C ≤ TA ≤ 85°C (Note 3)
–40°C ≤ TA ≤ 85°C (Note 3)
1.764
1.755
1.8
1.8
1.836
1.836
V
V
VOUT2
Output Voltage
0°C ≤ TA ≤ 85°C (Note 3)
–40°C ≤ TA ≤ 85°C (Note 3)
1.544
1.536
1.575
1.575
1.607
1.607
V
V
ΔVLINE REG
Reference Voltage Line Regulation
VIN = 2.5V to 5.5V (Note 3)
0.3
0.5
%/V
ΔVLOAD REG
Output Voltage Load Regulation
(Note 3)
0.5
%
IS
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
VOUT1 = 1.5V, VOUT2 = 1.3V
VOUT1 = 1.9V, VOUT2 = 1.65V
RUN = 0V, VIN = 5.5V
700
40
0.1
950
60
1
μA
μA
μA
fOSC
Oscillator Frequency
VOUT1 = 1.8V, VOUT2 = 1.575V
1.8
2.25
2.7
MHz
ILIM
Peak Switch Current Limit Channel 1
Peak Switch Current Limit Channel 2
VIN = 3V, Duty Cycle <35%
VIN = 3V, Duty Cycle <35%
0.95
0.6
1.2
0.7
1.6
0.9
A
A
RDS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
(Note 6)
(Note 6)
0.35
0.30
0.45
0.45
Ω
Ω
ISW(LKG)
Switch Leakage Current
VIN = 5V, VRUN = 0V, VOUT1 = VOUT2 = 0
0.01
1
μA
VRUN
RUN Threshold
0.3
1
1.5
V
IRUN
RUN Leakage Current
0.01
1
μA
The
l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise specified. (Note 2)
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Operation
Load Step
Load Step
3548-1 G01
VIN = 3.6V
VOUT1 = 1.8V
ILOAD = 60mA
CHANNEL 1; CIRCUIT OF FIGURE 3
SW
5V/DIV
VOUT1
20mV/DIV
IL
200mA/DIV
2μs/DIV
3548-1 G02
VIN = 3.6V
VOUT1 = 1.8V
ILOAD = 80mA TO 800mA
CHANNEL 1; CIRCUIT OF FIGURE 3
ILOAD
80mA TO
800mA
500mA/DIV
VOUT1
200mV/DIV
IL
500mA/DIV
20μs/DIV
3548-1 G03
VIN = 3.6V
VOUT2 = 1.575V
ILOAD = 40mA TO 400mA
CHANNEL 2; CIRCUIT OF FIGURE 3
ILOAD
40mA TO
400mA
200mA/DIV
VOUT2
200mV/DIV
IL
200mA/DIV
20μs/DIV
TA = 25°C unless otherwise specified.


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