SS Pin ...........................................................................3V
Operating Junction Temperature Range
(Note 3)..................................................– 40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
NFB 10
G PACKAGE
20-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 110°C/ W
ORDER INFORMATION
LEAD FREE FINISH
LT1683EG#PBF
LT1683IG#PBF
LEAD BASED FINISH
LT1683EG
LT1683IG
TAPE AND REEL
LT1683EG#TRPBF
LT1683IG#TRPBF
TAPE AND REEL
LT1683EG#TR
LT1683IG#TR
PART MARKING*
1683
1683
PART MARKING*
1683
1683
PACKAGE DESCRIPTION
20-Lead Plastic SSOP
20-Lead Plastic SSOP
PACKAGE DESCRIPTION
20-Lead Plastic SSOP
20-Lead Plastic SSOP
TEMPERATURE RANGE
– 40°C to 125°C
– 40°C to 125°C
TEMPERATURE RANGE
– 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/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
C
= 0.9V, V
FB
= V
REF
, R
VSL
, R
CSL
= 16.9k, R
T
= 16.9k and
other pins open unless otherwise noted.
SYMBOL
V
REF
I
FB
FB
REG
V
NFR
I
NFR
NFB
REG
g
m
PARAMETER
Reference Voltage
Feedback Input Current
Reference Voltage Line Regulation
Negative Feedback Reference Voltage
Negative Feedback Input Current
Negative Feedback Reference Voltage Line Regulation
Error Amplifier Transconductance
CONDITIONS
Measured at Feedback Pin
V
FB
= V
REF
2.7V ≤ V
IN
≤ 20V
Measured at Negative Feedback Pin
with Feedback Pin Open
V
NFB
= V
NFR
2.7V ≤ V
IN
≤ 20V
∆I
C
= ±50µA
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
Error Amplifiers
MIN
1.235
TYP
1.250
250
0.012
MAX
1.265
1000
0.03
– 2.45
UNITS
V
nA
%/V
V
µA
– 2.56
– 37
1100
700
– 2.500
– 25
0.009
1500
0.03
2200
2500
%/V
µmho
µmho
1683fd
2
LT1683
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
C
= 0.9V, V
FB
= V
REF
, R
VSL
, R
CSL
= 16.9k, R
T
= 16.9k and
other pins open unless otherwise noted.
SYMBOL
I
ESK
I
ESRC
V
CLH
V
CLL
A
V
FB
OV
I
SS
f
MAX
f
SYNC
V
SYNC
R
SYNC
DC
MAX
VG
ON
VG
OFF
IG
SO
IG
SK
V
INUVLO
t
IBL
V
SENSE
V
SENSEF
V
SLEWR
V
SLEWF
VI
SLEWR
VI
SLEWF
V
INMIN
I
VIN
V
SHDN
∆V
SHDN
I
SHDN
V5
IV5
SC
PARAMETER
Error Amp Sink Current
Error Amp Source Current
Error Amp Clamp Voltage
Error Amp Clamp Voltage
Error Amplifier Voltage Gain
FB Overvoltage Shutdown
Soft-Start Charge Current
Max Switch Frequency
Synchronization Frequency Range
SYNC Pin Input Threshold
SYNC Pin Input Resistance
Maximum Switch Duty Cycle
Gate On Voltage
Gate Off Voltage
Max Gate Source Current
Max Gate Sink Current
Gate Drive Undervoltage Lockout (Note 5)
Switch Current Limit Blanking Time
Sense Voltage Shutdown Voltage
Sense Voltage Fault Threshold
Output Voltage Slew Rising Edge
Output Voltage Slew Falling Edge
Output Current Slew Rising Edge (CS Pin Voltage)
Output Current Slew Falling Edge (CS Pin Voltage)
Minimum Input Voltage (Note 4)
Supply Current (Note 2)
Shutdown Turn-On Threshold
Shutdown Turn-On Voltage Hysteresis
Shutdown Input Current Hysteresis
5V Reference Voltage
5V Reference Short-Circuit Current
6.5V ≤ V
IN
≤ 20V, IV5 = 5mA
6.5V ≤ V
IN
≤ 20V, IV5 = – 5mA
V
IN
= 6.5V Source
V
IN
= 6.5V Sink
R
VSL
= R
CSL
= 17k
R
VSL
= R
CSL
= 17k
R
VSL
= R
CSL
= 17k
R
VSL
= R
CSL
= 17k
V
GCL
= V
IN
R
VSL
= R
CSL
= 17k , V
IN
= 12
R
VSL
= R
CSL
= 17k , V
IN
= 20
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
V
FB
= V
REF
+ 150mV, V
C
= 0.9V
V
FB
= V
REF
– 150mV, V
C
= 0.9V
High Clamp, V
FB
= 1V
Low Clamp, V
FB
= 1.5V
l
l
MIN
120
120
TYP
200
200
1.27
0.12
MAX
350
350
UNITS
µA
µA
V
V
V/V
V
180
Outputs Drivers Disabled
V
SS
= 1V
250
1.47
9.0
250
12
µA
kHz
kHz
Oscillator and Sync
Oscillator Frequency = 250kHz
l
290
0.7
1.4
40
2.0
kΩ
%
10.7
8.1
0.35
V
V
V
A
A
Gate Drives (Specifications Apply to Either A or B Unless Otherwise Noted)
R
VSL
= R
CSL
= 4.85k,
Osc Frequency = 25kHz
V
IN
= 12, GCL = 12
V
IN
= 12, GCL = 8
V
IN
= 12V
V
IN
= 12V
V
IN
= 12V
V
GCL
= 6.5V, Gates Enabled
0.3
0.3
7.3
100
V
C
Pulled Low
l
l
l
45
10
7.6
46
10.4
7.9
0.2
7.5
V
ns
Current Sense
86
103
230
26
19
0.21
0.21
2.55
25
35
1.31
50
10
4.85
4.80
10
–10
1.39
110
24
5
5
3.6
45
55
1.48
180
35
5.20
5.15
120
300
mV
mV
V/µs
V/µs
V/µs
V/µs
V
mA
mA
V
mV
µA
V
V
mA
mA
Slew Control (for the Following Slew Tests See Test Circuit in Figure 1b)
Supply and Protection
1683fd
3
LT1683
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:
Supply current specification includes loads on each gate as in
Figure 1a. Actual supply currents vary with operating frequency, operating
voltages, V5 load, slew rates and type of external FET.
Note 3:
The LT1683E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 125°C operating range
are assured by design, characterization and correlation with statistical
process controls. The LT1683I is guaranteed and tested over the – 40° to
125° operating temperature range.
Note 4:
Output gate drivers will be enabled at this voltage. The GCL voltage
中风发生时，一切都是以秒来计算的。延误治疗可能导致大脑重大损伤。伦敦大学医学院的一位博士Alistair McEwan已经获得行为医学研究所(Action Medical Research)的同意，为急救人员开发一种无线诊断系统来减少时间延误。感谢抗血栓药物，一些病人在病情发作的三个小时之内可以完全恢复。但出血也会导致中风。医生在治疗之前需要确定发病原因，因为不适当的服用抗血栓药物会加重损害。...[详细]
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