Datasheet

4
LT1681
1681f
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
CC
= V
BST
= 12V, V
BSTREF
= 0V, V
VC
= 2V, V
TS
= 0V, V
FB
= V
REF
= 1.25V, C
TG
= C
BG
= C
SG
= 1000pF.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Drivers
V
TG
TG On Voltage ● 11 11.5 V
TG Off Voltage
● 0.1 0.5 V
t
TGr/f
TG Rise/Fall Times 10% to 90%/90% to 10% 35 ns
V
BG
BG On Voltage ● 11 11.5 V
BG Off Voltage
● 0.1 0.5 V
t
BGr/f
BG Rise/Fall Times 10% to 90%/90% to 10% 35 ns
V
SG
SG On Voltage ● 11 11.5 V
SG Off Voltage
● 0.1 0.5 V
t
SGr/f
SG Rise/Fall Times 10% to 90%/90% to 10% 35 ns
t
SG-BG
SG to BG Enable Lag Time 4V On/Off Thresholds ● 80 150 300 ns
t
TG-BG
TG to BG Enable Lag Time 4V On/Off Thresholds 100 ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Supply current specification does not include external FET gate
charge currents. Actual supply currents will be higher and vary with
operating frequency, operating voltages and the type of external switch
elements used. See Applications Information.
Note 3: Guaranteed but not tested.
Note 4: The LT1681E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. For guaranteed performance to
specifications over the –40°C to 85°C range, the LT1681I is available.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
I
CC
Supply Current
vs Temperature
TEMPERATURE (°C)
–55
I
CC
SUPPLY CURRENT (mA)
15
12580
1681 G01
–40
0
40
20
19
18
17
16
V
CC
= 12V
SHDN PIN VOLTAGE (mV)
500
I
CC
SUPPLY CURRENT (nA)
700
900
1100
1000 200 300 400
1681 G02
500
T
A
= 25°C
SUPPLY VOLTAGE (V)
9
I
CC
SUPPLY CURRENT (mA)
16
1816
1681 G03
15
10
12
14
18
17
T
A
= 25°C
I
CC
Supply Current
vs SHDN Pin Voltage
I
CC
Supply Current
vs V
CC
Supply Voltage