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LT1681ISW Datasheet(PDF) 2 Page - Linear Technology

Part # LT1681ISW
Description  Dual Transistor Synchronous Forward Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1681ISW Datasheet(HTML) 2 Page - Linear Technology

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LT1681
1681f
Supply Voltages
Power Supply (VCC)............................. – 0.3V to 20V
Topside Supply (VBST)................... VBSTREF – 0.3V to
VBSTREF + 20V (VBST(MAX) = 90V)
Topside Reference Pin (VBSTREF).......... – 0.6V to 75V
Input Voltages
SHDN Pin .................................. – 0.3V to VCC + 0.3V
All Other Inputs ..................... – 0.3V to 5VREF + 0.3V
Maximum Currents
5VREF Pin ........................................ – 85mA to 10mA
FSET Pin ............................................. – 2mA to 5mA
All Other Inputs .................................. – 2mA to 2mA
Operating Ambient Temperature Range
LT1681E (Note 4) .............................. – 40
°C to 85°C
LT1681I ............................................. – 40
°C to 85°C
Storage Temperature Range ................ – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300
°C
(Note 1)
ORDER PART
NUMBER
LT1681ESW
LT1681ISW
TJMAX = 125°C, θJA = 85°C/ W
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF.
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
1
2
3
4
5
6
7
8
9
10
TOP VIEW
SW PACKAGE
20-LEAD PLASTIC SO
20
19
18
17
16
15
14
13
12
11
SHDN
OVLO
THERM
SGND
5VREF
FSET
SYNC
SS
VFB
VC
VBST
TG
BSTREF
BLKSENS
BG
PWRGND
VCC
SG
IMAX
SENSE
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply and Protection
VCC
Operating Supply Voltage Range
q
912
18
V
ICC
DC Active Supply Current
(Note 2)
17
22
mA
q
25
mA
DC Active UVL Supply Current
VSHDN > 1.35V, VCC = 8V
q
800
1200
µA
DC Standby Supply Current
VSHDN < 0.3V
0.5
µA
IBST
DC Active Supply Current
TG Logic High (Note 2)
q
5
8.5
mA
DC Standby Supply Current
VSHDN < 0.3V
0.1
µA
VSHDN
Shutdown Rising Threshold
q
1.15
1.25
1.35
V
Shutdown Threshold Hysteresis
q
100
150
200
mV
ISS
Soft-Start Charge Current
VSS = 2V
q
–14
– 10
– 6
µA
VSS
Soft-Start Reset Threshold
225
mV
VCCUVLO
Undervoltage Lockout Threshold
Falling Edge
q
8.0
8.40
8.60
V
Rising Edge
q
8.3
8.75
8.95
V
Undervoltage Lockout Hysteresis
q
0.25
0.35
V
VBSTUVLO Boost Undervoltage Lockout
Falling Edge
q
5.7
6.4
7.1
V
(VBST-BSTREF)
Rising Edge
q
6.5
7.0
7.5
V
Boost UVLO Hysteresis
q
0.3
0.6
V
Consult LTC Marketing for parts specified with wider operating temperature ranges.


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