LT1681I Просмотр технического описания (PDF) - Linear Technology
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LT1681I Datasheet PDF : 20 Pages
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LT1681
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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
PACKAGE/ORDER INFORMATION
TOP VIEW
SHDN 1
OVLO 2
THERM 3
SGND 4
5VREF 5
FSET 6
SYNC 7
SS 8
VFB 9
VC 10
20 VBST
19 TG
18 BSTREF
17 BLKSENS
16 BG
15 PWRGND
14 VCC
13 SG
12 IMAX
11 SENSE
SW PACKAGE
20-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 85°C/ W
ORDER PART
NUMBER
LT1681ESW
LT1681ISW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
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.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Supply and Protection
VCC
Operating Supply Voltage Range
ICC
DC Active Supply Current
(Note 2)
q
9
12
18
17
22
q
25
IBST
VSHDN
DC Active UVL Supply Current
DC Standby Supply Current
DC Active Supply Current
DC Standby Supply Current
Shutdown Rising Threshold
Shutdown Threshold Hysteresis
VSHDN > 1.35V, VCC = 8V
VSHDN < 0.3V
TG Logic High (Note 2)
VSHDN < 0.3V
q
800 1200
0.5
q
5
8.5
0.1
q
1.15 1.25 1.35
q
100 150 200
ISS
VSS
VCCUVLO
Soft-Start Charge Current
Soft-Start Reset Threshold
Undervoltage Lockout Threshold
VSS = 2V
Falling Edge
Rising Edge
q
–14 – 10
–6
225
q
8.0
8.40 8.60
q
8.3
8.75 8.95
Undervoltage Lockout Hysteresis
q
0.25 0.35
VBSTUVLO Boost Undervoltage Lockout
(VBST-BSTREF)
Boost UVLO Hysteresis
Falling Edge
Rising Edge
q
5.7
6.4
7.1
q
6.5
7.0
7.5
q
0.3
0.6
UNITS
V
mA
mA
µA
µA
mA
µA
V
mV
µA
mV
V
V
V
V
V
V
1681f
2
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