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High Speed Synchronous N-Channel MOSFET Driver Delivers 5A for High Efficiency Buck or Boost DC/DC Converters

(PresseBox) (MILPITAS, CA, ) 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. The LTC4443IDD and LTC4443IDD-1, are tested and guaranteed to operate from -40°C to 85°C operating temperature range.

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


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

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