Synchronous N-Channel MOSFET Driver delivers up to 5 A.April 8, 2008 -
Offered in 3 x 3 mm DFN-12 package, LTC4443/-1 can sink 5 A max and source 2.4 A max for driving upper and lower power N-Channel MOSFETs over 6-9.5 V range in synchronous rectified converter topologies. Products can also drive multiple MOSFETs in parallel. Rise time of 12 nS and fall time of 8 nS, when driving 3,000 pF load, minimize switching losses. While nominal VCC undervoltage lockout is 3.2 V, -1 version offers 6.2 V for driving standard 5 V logic N-Channel MOSFETs.
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Original Press release
Linear Technology Corp.
1630 McCarthy Blvd.
Milpitas, CA, 95035
USA
High Speed Synchronous N-Channel MOSFET Driver Delivers 5A for High Efficiency Buck or Boost DC/DC Converters
MILPITAS, CA - March 19, 2008 - Linear Technology Corporation introduces the LTC4443/-1, a high speed synchronous MOSFET driver designed to drive upper and lower power N-Channel MOSFETs in synchronous rectified converter topologies. This driver, combined with power MOSFETs and one of Linear Technology's many DC/DC controllers, forms a complete high efficiency synchronous regulator that can be used as a step-down or step-up DC/DC converter.
This powerful driver can sink up to 5A and source up to 2.4A, making it ideally suited for driving high gate capacitance, high current MOSFETs. The LTC4443/-1 can also drive multiple MOSFETs in parallel for higher current applications. The fast 12nS rise time and 8nS fall time when driving a 3,000 pF load, minimize switching losses. Adaptive shoot-through protection is integrated to prevent both the upper and lower MOSFETs from conducting simultaneously and to minimize dead time. An integrated bootstrap schottky diode is incorporated which simplifies the circuit.
The LTC4443/-1 has a 3-state PWM input for power stage shut-down that is compatible with all multi-phase controllers employing a 3-state output feature. In addition, it has a separate supply for the input logic to match the signal swing of the controller IC and has an undervoltage lockout circuit on both the driver and logic supplies. Furthermore, this part drives both upper and lower MOSFET gates over a range of 6V to 9.5V and operates up to a 38V supply voltage. The -1 version has a higher VCC undervoltage lockout of 6.2V instead of 3.2V, intended to drive standard 5V logic N-Channel MOSFETs.
The LTC4443EDD and LTC4443EDD-1 are offered in a 3mm x 3mm DFN-12 package with prices starting at $1.35 for 1000-piece quantities. The LTC4443IDD and LTC4443IDD-1, tested and guaranteed to operate from -40°C to 85°C operating temperature range are priced at $1.50 in 1000-piece quantities.
Summary of Features: LTC4443/-1
Synchronous N-Channel MOSFET Driver
High Drive Current - 2.4A Source, 5A Sink
Adaptive Shoot-Through Protection
8ns Top Gate Fall Time when driving 3000pF
12ns Top Gate Rise Time when driving 3000pF
Three-State PWM Input for Power Stage Shutdown
Integrated Bootstrap Schottky Diode
38V Maximum Supply Voltage
6V to 9.5V Gate Drive Voltage
LTC4443 UVLO of 3.2V
LTC4443-1 UVLO of 6.2V
Synchronous MOSFET Driver for DC/DC Converters
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.
LT, LTC and LTM are registered trademarks and uModule is a trademark of Linear Technology Corp.
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
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