ltc3900 Linear Technology Corporation, ltc3900 Datasheet - Page 3

• Manufacturer Part Number: ltc3900
• Description: Synchronous Rectifier Driver For Forward Converters
• Manufacturer: Linear Technology Corporation

temperature range.
SYMBOL
Switching Characteristics (Note 7)
t
t
t
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3900E 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.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: Supply current in normal operation is dominated by the current
needed to charge and discharge the external MOSFET gates. This current
TYPICAL PERFOR A CE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
d
SYNC
r
, t
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
f
17
15
13
11
9
7
5
3
–50
Timeout vs V
4
Current Sense Threshold vs
Temperature
T
R
C
V
A
TMR
TMR
CC
–25
= 25°C
5
= 5V, 11V
= 470pF
= 51k
6
0
TEMPERATURE (°C)
PARAMETER
SYNC Input to Driver Output Delay
Minimum SYNC Pulse Width
Driver Rise/Fall Time
CC
25
7
V
CC
V
CC
(V)
50
8
= 5V, T
75
9
A
W
= 25
100
10
3900 G04
3900 G01
°
C unless otherwise specified. (Note 3)
125
U
11
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
18
17
16
15
14
13
12
11
10
–50
0
Timeout vs Temperature
V
Input Current
V
R
C
CS(MAX)
T
A
CC
TMR
TMR
CONDITIONS
C
V
C
= 25°C
–25
FG
SYNC
FG
= 5V
5
= 51k
= 470pF
The
= C
= C
CS
= ±5V
Clamp Voltage vs CS
+
0
CG
CG
TEMPERATURE (°C)
●
INPUT CURRENT (mA)
10
= 4700pF, V
= 4700pF, V
denotes specifications which apply over the full operating
25
15
will vary with supply voltage, switching frequency and the external
MOSFETs used.
Note 5: The current sense comparator threshold has a 0.33%/°C
temperature coefficient (TC) to match the TC of the external MOSFET
R
Note 6: Guaranteed by design, not subject to test.
Note 7: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured from ±1.4V at SYNC input to 20%/80% levels at the
driver output.
DS(ON)
50
20
SYNC
SYNC
75
.
= ±5V
= ±5V
25
100
+
3900 G02
3900 G05
125
30
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
10
●
●
9
8
7
6
5
4
3
2
1
0
–50
0
Timeout vs R
SYNC Positive Threshold vs
Temperature
T
V
C
A
CC
TMR
10 20 30 40 50 60 70 80 90 100
MIN
–25
= 25°C
75
= 5V
= 470pF
V
0
CC
TEMPERATURE (°C)
= 5V
TYP
15
60
TMR
R
V
25
TMR
CC
LTC3900
= 11V
(kΩ)
50
MAX
120
75
100
UNITS
3900 G06
3900 G03
3
3900f
125
ns
ns
ns