LT3845E (Note 3) ............................... –40°C to 125°C
LT3845I .............................................. –40°C to 125°C
LT3845MP.......................................... –55°C to 125°C
Storage Temperature.............................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
V
IN
SHDN
C
SS
BURST_EN
V
FB
V
C
SYNC
f
SET
1
2
3
4
5
6
7
8
17
16 BOOST
15 TG
14 SW
13 V
CC
12 BG
11 PGND
10
9
SENSE
+
SENSE
–
V
FB
V
C
f
SET
SGND
SENSE
–
SENSE
+
PGND
BG
1
2
3
4
5
6
7
8
N PACKAGE
16-LEAD PDIP
T
JMAX
= 125°C,
θ
JA
= 70°C/W,
θ
JC
= 34°C/W
TOP VIEW
16 BURST_EN
15 C
SS
14
SHDN
13 V
IN
12 BOOST
11 TG
10 SW
9
V
CC
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 40°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3845EFE#PBF
LT3845IFE#PBF
LT3845MPFE#PBF
LT3845EN#PBF
TAPE AND REEL
LT3845EFE#TRPBF
LT3845IFE#TRPBF
LT3845MPFE#TRPBF
LT3845EN#TRPBF
PART MARKING*
3845FE
3845FE
3845FE
3845N
PACKAGE DESCRIPTION
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead PDIP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°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/
3845fd
2
LT3845
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Operating Voltage Range (Note 4)
V
IN
Minimum Start Voltage
V
IN
UVLO Threshold (Falling)
V
IN
UVLO Threshold Hysteresis
V
IN
Supply Current
V
IN
Burst Mode Current
V
IN
Shutdown Current
BOOST Operating Voltage Range
BOOST Operating Voltage Range (Note 5)
BOOST UVLO Threshold (Rising)
BOOST UVLO Threshold Hysteresis
BOOST Supply Current (Note 6)
BOOST Burst Mode Current
BOOST Shutdown Current
V
CC
Operating Voltage Range (Note 5)
V
CC
Output Voltage
V
CC
UVLO Threshold (Rising)
V
CC
UVLO Threshold Hysteresis
V
CC
Supply Current (Note 6)
V
CC
Burst Mode Current
V
CC
Shutdown Current
V
CC
Current Limit
Error Amp Reference Voltage
V
FB
Pin Input Current
SHDN
Enable Threshold (Rising)
SHDN
Threshold Hysteresis
Sense Pins Common Mode Range
Current Limit Sense Voltage
Reverse Protect Sense Voltage
Reverse Current Inhibit Offset
Input Current (I
SENSE+
+ I
SENSE–
)
V
SENSE+
– V
SENSE–
V
SENSE+
– V
SENSE–
, V
BURST_EN
= V
CC
V
BURST_EN
= 0V or V
BURST_EN
= V
FB
V
SENSE(CM)
= 0V
V
SENSE(CM)
= 2V
V
SENSE(CM)
> 4V
●
●
●
●
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
DSP 与 ARM 处理器
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