LT1336 Linear Technology, LT1336 Datasheet - Page 6

• Manufacturer Part Number: LT1336
• Description: Half-Bridge N-Channel Power MOSFET Driver with Boost Regulator
• Manufacturer: Linear Technology

PIN
I
An R
peak current. Pin 1 can be left open if the boost regulator
is not used.
SV
to the signal ground Pin 6.
INTOP (Pin 3): Top Driver Input. Pin 3 is disabled when Pin
4 is high. A 3k input resistor followed by a 5V internal
clamp prevents saturation of the input transistors.
INBOTTOM (Pin 4): Bottom Driver Input. Pin 4 is disabled
when Pin 3 is high. A 3k input resistor followed by a 5V
internal clamp prevents saturation of the input transistors.
UVOUT (Pin 5): Undervoltage Output. Open collector NPN
output which turns on when V
age threshold.
SGND (Pin 6): Small-Signal Ground. Must be routed
separately from other grounds to the system ground.
PGND (Pin 7): Bottom Driver Power Ground. Connects to
source of bottom N-channel MOSFET.
BGATEFB (Pin 8): Bottom Gate Feedback. Must connect
directly to the bottom power MOSFET gate. The top
MOSFET turn-on is inhibited until Pin 8 has discharged to
below 2.5V.
LT1336
TYPICAL PERFORMANCE CHARACTERISTICS
6
SENSE
+
U
(Pin 2): Main Signal Supply. Must be closely decoupled
SENSE
(Pin 1): Boost Regulator I
FUNCTIONS
placed between Pin 1 and V
U
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
–50
V
vs Temperature
BOOST
U
–25
Regulated Output
W
V
0
TEMPERATURE ( C)
BOOST
+
drops below the undervolt-
25
SENSE
– V
U
TSOURCE
50
+
V
V
I
LOAD
TSOURCE
+
Comparator Input.
sets the maximum
= 12V
75
= 10mA
100
= 40V
1336 G19
125
BGATEDR (Pin 9): Bottom Gate Drive. The high current
drive point for the bottom MOSFET. When a gate resistor
is used it is inserted between Pin 9 and the gate of the
MOSFET.
PV
to the same supply as Pin 2.
TSOURCE (Pin 11): Top Driver Return. Connects to the top
MOSFET source and the low side of the bootstrap capacitor.
TGATEFB (Pin 12): Top Gate Feedback. Must connect
directly to the top power MOSFET gate. The bottom
MOSFET turn-on is inhibited until V
has discharged to below 2.9V.
TGATEDR (Pin 13): Top Gate Drive. The high current drive
point for the top MOSFET. When a gate resistor is used it
is inserted between Pin 13 and the gate of the MOSFET.
BOOST (Pin 14): Top Driver Supply. Connects to the high
side of the bootstrap capacitor.
SWGND (Pin 15): Boost Regulator Ground. Must be routed
separately from the other grounds to the system ground.
Pin 15 can be left open if the boost regulator is not used.
SWITCH (Pin 16): Boost Regulator Switch. Connect this
pin to the inductor/diode of the boost regulator network.
Pin 16 can be left open if the boost regulator is not used.
+
(Pin 10): Bottom Driver Supply. Must be connected
0.52
0.50
0.48
0.46
0.44
0.42
0.40
0.38
0.36
–50
I
vs Temperature
SENSE
HIGH VOLTAGE THRESHOLD
LOW VOLTAGE THRESHOLD
–25
Voltage Threshold
0
TEMPERATURE ( C)
25
50
V
V
V
+
BOOST
TSOURCE
= 12V
75
= 68V
TGATE FB
100
= 60V
1336 G20
125
– V
TSOURCE