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LTC3900MPS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC3900
4
3900fb
Typical perForMance characTerisTics
Current Sense Threshold vs
Temperature
V
CS(MAX)
Clamp Voltage vs CS
+
Input Current
SYNC Positive Threshold vs
Temperature
SYNC Negative Threshold vs
Temperature Propagation Delay vs V
CC
Propagation Delay vs
Temperature
Timeout vs V
CC
Timeout vs Temperature Timeout vs R
TMR
TIMEOUT (µs)
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
V
CC
(V)
4
TIMEOUT (µs)
5.25
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
4.75
6
8
9
3900 G01
5
7
10
11
TEMPERATURE (°C)
–50–75 0
50
75
3900 G02
–25
25
100
150125
R
TMR
(kΩ)
10
9
8
7
6
5
4
3
2
1
0
TIMEOUT (µs)
3900 G03
0 10 20 30 40 50 60 70 80 90 100
T
A
= 25°C
R
TMR
= 51k
C
TMR
= 470pF
T
A
= 25°C
V
CC
= 5V
C
TMR
= 470pF
V
CC
= 5V
R
TMR
= 51k
C
TMR
= 470pF
CURRENT SENSE THRESHOLD (mV)
17
15
13
11
9
7
5
3
3900 G04
V
CC
= 5V, 11V
CS
+
INPUT CURRENT (mA)
0 5
V
CS(MAX)
CLAMP VOLTAGE (V)
10 2015
25
30
3900 G05
18
17
16
15
14
13
12
11
10
TEMPERATURE (°C)
–75 –50
SYNC POSITIVE THRESHOLD (V)
100
3900 G06
0 50
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
–25 25 75 150125
TEMPERATURE (°C)
–50–75 100
0 50–25 25 75 150125
T
A
= 25°C
V
CC
= 5V
V
CC
= 11V
TEMPERATURE (°C)
SYNC NEGATIVE THRESHOLD (V)
3900 G07
–1.0
–1.1
–1.2
–1.3
–1.4
–1.5
–1.6
–1.7
–1.8
V
CC
(V)
4
PROPAGATION DELAY (ns)
10
3900 G08
6 8
120
110
100
90
80
70
60
50
40
5 7 9 11
TEMPERATURE (°C)
3900 G09
–75 –50 100
0 50–25 25 75 150125
T
A
= 25°C
C
LOAD
= 4.7nF
V
CC
= 5V
C
LOAD
= 4.7nF
V
CC
= 5V, 11V
SYNC TO FG
SYNC TO CG
SYNC TO FG
SYNC TO CG
PROPAGATION DELAY (µs)
120
110
100
90
80
70
60
50
40
–75 –50 100
0 50–25 25 75 150125
LTC3900
5
3900fb
C
LOAD
(nF)
10 2 3 104 5 6 7 98
RISE/FALL TIME (ns)
50
45
40
35
30
25
20
15
10
5
0
T
A
= 25°C
V
CC
= 5V
FALL TIME
RISE TIME
UNDERVOLTAGE LOCKOUT THRESHOLD
VOLTAGE (V)
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
3900 G143900 G13
3900 G15
TEMPERATURE (°C)
–75 –50 100
0 50–25 25 75 125 150
FALLING EDGE
RISING EDGE
TEMPERATURE (°C)
–75 –50 100
0 50
–25 25 75 150125
C
LOAD
= 4.7nF
V
CC
SUPPLY CURRENT (mA)
20
18
16
14
12
10
8
6
4
V
CC
= 5V
V
CC
= 11V
C
LOAD
(nF)
10 2 3 104 5 6 7 98
T
A
= 25°C
f
SYNC
= 100kHz
3900 G16
V
CC
= 5V
V
CC
= 11V
SUPPLY CURRENT (mA)
30
25
20
15
10
5
0
Typical perForMance characTerisTics
Rise/Fall Time vs Load
Capacitance
Undervoltage Lockout Threshold
Voltage vs Temperature
V
CC
Supply Current vs
Temperature
V
CC
Supply Current vs Load
Capacitance
Propagation Delay vs C
LOAD
Rise/Fall Time vs V
CC
Rise/Fall Time vs Temperature
C
LOAD
(nF)
1 2 3 10
3900 G10
4 5 6 7 98
RISE/FALL TIME (ns)
50
45
40
35
30
25
20
15
10
5
0
RISE/FALL TIME (ns)
50
45
40
35
30
25
20
15
10
5
0
3900 G11
TEMPERATURE (°C)
3900 G12
T
A
= 25°C
C
LOAD
= 4.7nF
T
A
= 25°C
V
CC
= 5V
V
CC
= 5V
C
LOAD
= 4.7nF
SYNC TO FG
SYNC TO CG
PROPAGATION DELAY (ns)
120
110
100
90
80
70
60
50
40
V
CC
(V)
4 10
6 85 7 9 11
FALL TIME
FALL TIME
RISE TIME
RISE TIME
–75 –50 100
0 50–25 25 75 150125
LTC3900
6
3900fb
block DiagraM
pin FuncTions
CS
+
, CS
–
(Pin 1, 2): Current Sense Differential Input.
Connect CS
+
through a series resistor to the drain of the
external catch MOSFET, Q4. Connect CS
–
to the source.
The LTC3900 monitors the CS inputs 250ns after CG goes
high. If the inductor current reverses and flows into the
MOSFET causing CS
+
to rise above CS
–
by more than
10.5mV, the LTC3900 pulls CG low. See the Current Sense
section for more details on choosing the resistance value
for R
CS1
to R
CS3
.
CG (Pin 3): Catch MOSFET Gate Driver. This pin drives the
gate of the external N-channel catch MOSFET, Q4.
V
CC
(Pin 4): Main Supply Input. This pin powers the driv-
ers and the rest of the internal circuitry. Bypass this pin
to GND using a 4.7µF ceramic capacitor in close proximity
to the LTC3900.
FG (Pin 5): Forward MOSFET Gate Driver. This pin drives
the gate of the external N-channel forward MOSFET, Q3.
GND (Pin 6): The V
CC
bypass capacitor should be con-
nected directly to this GND pin.
TIMER (Pin 7): Timer Input. Connect this pin to an external
R-C network to program the timeout period. The LTC3900
resets the timer at every negative transition of the SYNC
input. If the SYNC signal is missing or incorrect, the
LTC3900 pulls both CG and FG low once the TIMER pin
goes above the timeout threshold. See the Timer section
for more details on programming the timeout period.
SYNC (Pin 8): Driver Synchronization Input. This input
is signal edge sensitive. A negative voltage slew at SYNC
forces FG to pull high and CG to pull low. A positive volt-
age slew at SYNC forces FG to pull low and CG to pull
high. The SYNC input can accept both pulse or square
wave signals.
SYNC
AND
DRIVER
LOGIC
IS
S
–
S
+
SYNC
+
SYNC
–
TMR
–1.4V
+1.4V
DISABLE
DRIVER
UVLO
Z
TMR
0.5 • V
CC
Z
CS
11V
7
2
1
8
5
4
SYNC
CS
+
CS
–
TIMER
M
TMR
R1
180k
R2
45k
TIMER
RESET
FG
GND
CG
V
CC
3
6
3900 BD
+
–
10.5mV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC3900MPS8#PBF

Mfr. #:
Buy LTC3900MPS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Gate Drivers Sync Rectifier Drvr for For Convs
Lifecycle:
New from this manufacturer.
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