EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
UD PACKAGE
16-LEAD (3mm 3mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 45°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3601EUD#PBF
LTC3601IUD#PBF
LTC3601EMSE#PBF
LTC3601IMSE#PBF
TAPE AND REEL
LTC3601EUD#TRPBF
LTC3601IUD#TRPBF
LTC3601EMSE#TRPBF
LTC3601IMSE#TRPBF
PART MARKING*
LFJC
LFJC
3601
3601
PACKAGE DESCRIPTION
16-Lead (3mm
×
3mm) Plastic QFN
16-Lead (3mm
×
3mm) Plastic QFN
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
3601fb
2
LTC3601
ELECTRICAL CHARACTERISTICS
SYMBOL
V
VIN
I
Q
PARAMETER
Input Supply Range
Input DC Supply Current
Forced Continuous Operation
Sleep Current
Shutdown
Feedback Reference Voltage
Reference Voltage Line Regulation
Output Voltage Load Regulation
Feedback Pin Input Current
Error Amplifier Transconductance
Minimum On-Time
Minimum Off-Time
Valley Switch Current Limit
Oscillator Frequency
The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
VIN
= 12V, unless otherwise specified.
CONDITIONS
l
MIN
4
TYP
MAX
15
1000
500
25
0.606
UNITS
V
μA
μA
μA
V
%/V
%
nA
mS
ns
ns
A
MHz
MHz
MHz
mΩ
mΩ
V
V
V
%
V
V
V
V
μA
%
%
%
%
μs
Ω
μA
μs
V
μA
V
V
V
μA
μA
MODE = 0V
MODE = INTV
CC
, V
FB
> 0.6V
RUN = 0V
l
V
FB
∆V
LINEREG
∆V
LOADREG
I
FB
g
m(EA)
t
ON(MIN)
t
OFF(MIN)
I
LIM
f
OSC
0.594
V
VIN
= 4V to 15V
ITH = 0.6V to 1.6V
V
FB
= 0.6V
ITH = 1.2V
V
ON
= 1V, V
IN
= 4V
V
IN
= 6V
V
RT
= INTV
CC
R
RT
= 160k
R
RT
= 80k
1.7
1.4
1.7
3.4
700
300
14
0.600
0.01
0.1
±30
2.0
20
40
2.2
2
2
4
130
100
17.5
16.5
3.3
0.6
2.75
2.45
1.25
1.0
0
8
–8
–5
5
40
15
0.01
400
0.3
1.4
60
2.8
2.6
2.3
4.6
R
DS(ON)
V
VIN-OV
V
INTVCC
∆INTV
CC
V
UVLO
V
RUN
I
RUN(LKG)
V
FB_GB
V
FB_BG
t
PGOOD
R
PGOOD
I
SW(LKG)
t
SS
V
FB_TRACK
I
TRACK
V
MODE/
SYNC
Top Switch On-Resistance
Bottom Switch On-Resistance
V
IN
Overvoltage Lockout Threshold
INTV
CC
Voltage
INTV
CC
Load Regulation (Note 4)
INTV
CC
Undervoltage Lockout
Threshold
RUN Threshold
RUN Leakage Current
PGOOD Good-to-Bad Threshold
PGOOD Bad-to-Good Threshold
Power Good Filter Time
PGOOD Pull-Down Resistance
Switch Leakage Current
Internal Soft-Start Time
TRACK Pin
TRACK Pull-Up Current
MODE Threshold Voltage
SYNC Threshold Voltage
MODE Input Current
V
IN
Rising
V
IN
Falling
4V < V
IN
< 15V
I
INTVCC
= 0mA to 20mA
INTV
CC
Rising, V
IN
= INTV
CC
INTV
CC
Falling, V
IN
= INTV
CC
RUN Rising
RUN Falling
V
VIN
= 15V
FB Rising
FB Falling
FB Rising
FB Falling
10mA Load
V
RUN
= 0V
V
FB
from 10% to 90% Full Scale
TRACK = 0.3V
MODE V
IH
MODE V
IL
SYNC V
IH
MODE = 0V
MODE = INTV
CC
l
l
16.8
15.8
3.15
18
17
3.45
2.9
1.29
1.03
±3
10
–10
l
l
1.21
0.97
–3
3
20
0.28
l
l
l
1
700
0.315
1.0
0.4
0.95
–1.5
1.5
I
MODE
3601fb
3
LTC3601
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 LTC3601 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3601E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3601I is guaranteed over the full –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Note 3:
T
J
is calculated from the ambient temperature, T
A
, and power
dissipation, P
D
, according to the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
where
θ
JA
= 45°C/W for the QFN package and
θ
JA
= 38°C/W for the MSOP
package.
Note 4:
Maximum allowed current draw when used as a regulated output
is 5mA. This supply is only intended to provide additional DC load current
as needed and not intended to regulate large transient or ac behavior as
http://www.freesoftwaremagazine.com/articles/drivers_linux“Do you pine for the nice days of Minix-1.1, when men were men and wrote their own device
drivers?” Linus Torvalds
......
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