LT4356C-1 ............................................... 0°C to 70°C
LT4356I-1 ............................................–40°C to 85°C
LT4356H-1 .........................................–40°C to 125°C
Storage Temperature Range
DE12 ..................................................–65°C to 125°C
MS .....................................................–65°C to 150°C
Lead Temperature (Soldering, 10 sec, MS10) ....... 300°C
PIN CONFIGURATION
TOP VIEW
TMR
FB
OUT
GATE
SNS
V
CC
1
2
3
4
5
6
13
12 IN
+
11 A
OUT
10 GND
9
8
7
EN
FLT
SHDN
FB
OUT
GATE
SNS
V
CC
1
2
3
4
5
TOP VIEW
10
9
8
7
6
TMR
GND
EN
FLT
SHDN
DE PACKAGE
12-LEAD (4mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
MS PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 120°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT4356CDE-1#PBF
LT4356IDE-1#PBF
LT4356HDE-1#PBF
LT4356CMS-1#PBF
LT4356IMS-1#PBF
LT4356HMS-1#PBF
LEAD BASED FINISH
LT4356CDE-1
LT4356IDE-1
LT4356HDE-1
LT4356CMS-1
LT4356IMS-1
LT4356HMS-1
TAPE AND REEL
LT4356CDE-1#TRPBF
LT4356IDE-1#TRPBF
LT4356HDE-1#TRPBF
LT4356CMS-1#TRPBF
LT4356IMS-1#TRPBF
LT4356HMS-1#TRPBF
TAPE AND REEL
LT4356CDE-1#TR
LT4356IDE-1#TR
LT4356HDE-1#TR
LT4356CMS-1#TR
LT4356IMS-1#TR
LT4356HMS-1#TR
PART MARKING*
43561
43561
43561
LTCNS
LTCNS
LTCNS
PART MARKING*
43561
43561
43561
LTCNS
LTCNS
LTCNS
PACKAGE DESCRIPTION
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
PACKAGE DESCRIPTION
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°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/
43561fd
2
LT4356-1
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC
I
CC
PARAMETER
Operating Voltage Range
V
CC
Supply Current
CONDITIONS
l
V
SHDN
= FLOAT
V
SHDN
= 0V
LT4356I-1, LT4356C-1
LT4356H-1
V
SNS
= V
CC
= –30V,
SHDN
Open
V
SNS
= V
CC
= V
SHDN
= –30V
V
CC
= 4V; (V
GATE
– V
OUT
)
48V ≥ V
CC
≥ 8V; (V
GATE
– V
OUT
)
V
GATE
= 12V; V
CC
= 12V
V
GATE
= 48V; V
CC
= 48V
Overvoltage, V
FB
= 1.4V, V
GATE
= 12V
Overcurrent, V
CC
– V
SNS
= 120mV, V
GATE
= 12V
Shutdown Mode, V
SHDN
= 0V, V
GATE
= 12V
V
GATE
= 12V; V
OUT
= 12V, LT4356I-1, LT4356C-1
V
GATE
= 12V; V
OUT
= 12V, LT4356H-1
V
FB
= 1.25V
ΔV
SNS
= (V
CC
– V
SNS
), V
CC
= 12V, LT4356I-1, LT4356C-1
ΔV
SNS
= (V
CC
– V
SNS
), V
CC
= 12V, LT4356H-1
ΔV
SNS
= (V
CC
– V
SNS
), V
CC
= 48V, LT4356I-1, LT4356C-1
ΔV
SNS
= (V
CC
– V
SNS
), V
CC
= 48V, LT4356H-1
V
SNS
= V
CC
= 12V to 48V
FLT,
EN = 80V
A
OUT
= 80V
V
TMR
= 1V, V
FB
= 1.5V, (V
CC
– V
OUT
) = 0.5V
V
TMR
= 1V, V
FB
= 1.5V, (V
CC
– V
OUT
) = 75V
V
TMR
= 1.3V, V
FB
= 1.5V
V
TMR
= 1V, ΔV
SNS
= 60mV, (V
CC
– V
OUT
) = 0.5V
V
TMR
= 1V, ΔV
SNS
= 60mV, (V
CC
– V
OUT
) = 80V
V
TMR
= 1V, V
FB
= 1V, ΔV
SNS
= 0V
FLT
From High to Low, V
CC
= 5V to 80V
V
GATE
From Low to High, V
CC
= 5V to 80V
From
FLT
going Low to GATE going Low, V
CC
= 5V to 80V
V
IN
+
= 1.25V
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 12V unless otherwise noted.
MIN
4
TYP
1
7
7
7
0.3
0.8
4.5
10
–4
–4.5
75
5
1.5
1.225
1.215
45
42.5
46
43
5
–23
–30
150
10
5
1.25
1.25
0.3
50
50
51
51
10
1.275
1.275
1
55
55
56
56
22
2.5
4.5
–4
–55
–8
–6.5
–315
2.7
1.28
0.52
120
1.28
1
8
800
300
12
0.7
1.7
2.1
2.2
–8
4
1
MAX
80
1.5
25
30
40
1
2
8
18
–36
–50
UNITS
V
mA
μA
μA
μA
mA
mA
V
V
μA
μA
mA
mA
mA
V
V
μA
mV
mV
mV
mV
μA
μA
μA
μA
μA
μA
μA
μA
μA
V
V
mV
V
μA
V
mV
μA
mA
V
V
V
V
μA
μs
μs
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
–1
0.25
0.6
0.4
–1.5
–44
–3.5
–2.5
–195
1.7
1.22
0.48
80
1.22
I
R
ΔV
GATE
I
GATE,UP
I
GATE,DN
Reverse Input Current
GATE Pin Output High Voltage
GATE Pin Pull-Up Current
GATE Pin Pull-Down Current
V
FB
I
FB
ΔV
SNS
FB Pin Servo Voltage
FB Pin Input Current
Overcurrent Fault Threshold
I
SNS
I
LEAK
I
TMR
SNS Pin Input Current
FLT,
EN Pins Leakage Current
A
OUT
Pin Leakage Current
TMR Pin Pull-up Current
–2.5
–50
–5.5
–4.5
–260
2.2
1.25
0.5
100
1.25
0.3
2
300
200
6
0.5
1.4
1.7
–4
2
0.25
TMR Pin Pull-down Current
V
TMR
ΔV
TMR
V
IN
I
IN
+
+
TMR Pin Thresholds
Early Warning Period
IN
+
Pin Threshold
IN
+
Pin Input Current
FLT,
EN, A
OUT
Pins Output Low
OUT Pin Input Current
OUT Pin High Threshold
SHDN
Pin Threshold
V
OL
I
OUT
ΔV
OUT
V
SHDN
I
SINK
= 2mA
I
SINK
= 0.1mA
V
OUT
= V
CC
= 12V
V
OUT
= V
CC
= 12V, V
SHDN
= 0V
ΔV
OUT
= V
CC
– V
OUT
; EN From Low to High
V
CC
= 12V to 48V
V
CC
= 12V to 48V
V
SHDN
= 0V
GATE From High to Low, ΔV
SNS
= 0
→
120mV
GATE From High to Low, V
FB
= 0
→
1.5V
V
SHDN(FLT)
SHDN
Pin Float Voltage
I
SHDN
t
OFF(OC
)
t
OFF(OV)
SHDN
Pin Current
Overcurrent Turn Off Delay Time
Overvoltage Turn Off Delay Time
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:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to GND unless otherwise
specified.
Note 3:
An internal clamp limits the GATE pin to a minimum of 10V above
the OUT pin. Driving this pin to voltages beyond the clamp may damage
在circuitpython中，串口的用法和micropython有较大区别。先看circuitpython中的用法:
from microcontroller import pin
from busio import UART
u = UART(pin.PA18, pin.PA19)
u.bau ......
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