LT1336_15 Datasheet, PDF (1/20 Pages) Linear Technology – Half-Bridge N-Channel Power MOSFET Driver with Boost Regulator

LT1336
Half-Bridge N-Channel
Power MOSFET Driver
with Boost Regulator
Features
n _{Floating Top Driver Switches Up to 60V}
n _{Internal Boost Regulator for DC Operation}
n _{180ns Transition Times Driving 10,000pF}
n _{Adaptive Nonoverlapping Gate Drives Prevent}
Shoot-Through
n _{Drives Gate of Top N-Channel MOSFET}
Above Supply
n _{Top Drive Maintained at High Duty Cycles}
n _{TTL/CMOS Input Levels}
n _{Undervoltage Lockout with Hysteresis}
n _{Operates at Supply Voltages from 10V to 15V}
n _{Separate Top and Bottom Drive Pins}
Applications
n _{PWM of High Current Inductive Loads}
n _{Half-Bridge and Full-Bridge Motor Control}
n _{Synchronous Step-Down Switching Regulators}
n _{3-Phase Brushless Motor Drive}
n _{High Current Transducer Drivers}
n _{Class D Power Amplifiers}
Description
The LT^®1336 is a cost effective half-bridge N-channel
power MOSFET driver. The floating driver can drive the
topside N-channel power MOSFETs operating off a high
voltage (HV) rail of up to 60V (absolute maximum). In
PWM operation an on-chip switching regulator maintains
charge in the bootstrap capacitor even when approaching
and operating at 100% duty cycle.
The internal logic prevents the inputs from turning on
the power MOSFETs in a half-bridge at the same time. Its
unique adaptive protection against shoot-through cur-
rents eliminates all matching requirements for the two
MOSFETs. This greatly eases the design of high efficiency
motor control and switching regulator systems.
During low supply or start-up conditions, the undervoltage
lockout actively pulls the driver outputs low to prevent
the power MOSFETs from being partially turned on. The
0.5V hysteresis allows reliable operation even with slowly
varying supplies.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
12V
1N4148
200µH*
R_SENSE
2Ω
1/4W
2
1
I_SENSE
SV⁺
16
SWITCH
14
BOOST
+ _10µF
25V
10 _PV+
13
TGATEDR
LT1336
12
TGATEFB
5 _UVOUT
11
TSOURCE
3 _INTOP
9
BGATEDR
4
INBOTTOM
8
BGATEFB
PWM
0Hz TO 100kHz
SGND SWGND PGND
6
15
7
1N4148
HV = 40V MAX**
+ _CBOOST
1µF
+
IRFZ44
1000µF
100V
INTOP INBOTTOM TGATEDR
IRFZ44
L
L
L
L
H
L
H
L
H
H
H
L
BGATEDR
L
H
L
L
* SUMIDA RCR-664D-221KC
** FOR HV > 40V SEE “DERIVING THE FLOATING
SUPPLY WITH THE FLYBACK TOPOLOGY” IN
APPLICATIONS INFORMATION SECTION
1336 TA01
1336fa
1