EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO GND
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 45°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS PGND, MUST BE SOLDERED TO GND
ORDER INFORMATION
LEAD FREE FINISH
LTC3548AEDD#PBF
LTC3548AEMSE#PBF
LTC3548AIDD#PBF
LTC3548AIMSE#PBF
TAPE AND REEL
LTC3548AEDD#TRPBF
LTC3548AEMSE#TRPBF
LTC3548AIDD#TRPBF
LTC3548AIMSE#TRPBF
PART MARKING*
LFKV
LTFKW
LFKV
LTFKW
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
3548af
2
LTC3548A
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
I
FB
V
FB
ΔV
LINE REG
ΔV
LOAD REG
I
S
PARAMETER
Operating Voltage Range
Feedback Pin Input Current
Feedback Voltage (Note 3)
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input DC Supply Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
Synchronization Frequency
Peak Switch Current Limit Channel 1
Peak Switch Current Limit Channel 2
Top Switch On-Resistance
Bottom Switch On-Resistance
Switch Leakage Current
Power-On Reset Threshold
Power-On Reset On-Resistance
Power-On Reset Delay
V
RUN
I
RUN
V
MODE
RUN/SS Threshold Low
RUN/SS Threshold High
RUN/SS Leakage Current
MODE Threshold Low
MODE Threshold High
●
●
●
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, unless otherwise specified. (Note 2)
CONDITIONS
●
●
MIN
2.5
0.588
0.585
TYP
MAX
5.5
30
UNITS
V
nA
V
V
%/V
%
0°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C (Note 2)
V
IN
= 2.5V to 5.5V (Note 3)
MODE/SYNC = 0V (Note 3)
(Note 4)
V
FB1
= V
FB2
= 0.5V
V
FB1
= V
FB2
= 0.63V, MODE/SYNC = 3.6V
RUN = 0V, V
IN
= 5.5V, MODE/SYNC = 0V
V
FBX
= 0.6V
V
IN
= 3V, V
FBX
= 0.5V, Duty Cycle < 35%
V
IN
= 3V, V
FBX
= 0.5V, Duty Cycle < 35%
(Note 6)
(Note 6)
V
IN
= 5V, V
RUN
= 0V, V
FBX
= 0V
V
FBX
Ramping Up, MODE/SYNC = 0V
V
FBX
Ramping Down, MODE/SYNC = 0V
●
0.6
0.6
0.3
0.5
700
40
0.1
0.612
0.612
0.5
950
60
1
2.7
1.6
0.9
0.45
0.45
1
μA
μA
μA
MHz
MHz
A
A
Ω
Ω
μA
%
%
f
OSC
f
SYNC
I
LIM
R
DS(ON)
I
SW(LKG)
POR
●
1.8
1
0.6
2.25
2.25
1.2
0.7
0.35
0.30
0.01
8.5
–8.5
100
65,536
200
1.5
2
1
0.5
V
IN
Ω
Cycles
V
V
μA
V
V
0.3
1
0.01
0
V
IN
– 0.5
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 LTC3548AE is guaranteed to meet specified performance from
0°C to 85°C. Specifications over the –40°C and 85°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3548AI is guaranteed over the full
–40°C to 125°C operating junction temperature range.
Note 3:
The LTC3548A is tested in a proprietary test mode that connects
V
FB
to the output of the error amplifier.
Note 4:
Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5:
T
J
is calculated from the ambient, T
A
, and power dissipation, P
D
,
according to the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
).
Note 6:
The DFN switch on-resistance is guaranteed by correlation to
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