High Speed, High Voltage, High Side Gate Driver

The LTC4440-5 is a high frequency high side N-channel MOSFET gate driver that is designed to operate in applications with VIN voltages up to 60V. The LTC4440-5 can also withstand and continue to function during 80V VIN transients. The powerful driver capability reduces switching losses in MOSFETs with high gate capacitances. The LTC4440-5’s pull-up has a peak output current of 1.1A and its pull-down has an output impedance of 1.85Ω.

The LTC4440-5 features supply independent TTL/CMOS compatible input thresholds with 350mV of hysteresis. The input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 95V above ground.

The LTC4440-5 is optimized for driving (5V) logic level FETs and contains an undervoltage lockout circuit that disables the external MOSFET when activated.

The LTC4440-5 is available in the low profile (1mm) SOT-23 or a thermally enhanced 8-lead MSOP package.

Parameter

LTC4440-5

LTC4440A-5

LTC4440

Max Operating TS

60V

80V

80V

Abssolute Max TS

80V

100V

100V

MOSFET Gate Drive

4V to 15V

4V to 15V

8V to 15V

VCC UV+

3.2V

3.2V

6.3V

VCC UV-

3.04V

3.04V

6.0V

Applications

* Telecommunications Power Systems

* Distributed Power Architectures

* Server Power Supplies

* High Density Power Modules

* General Purpose Low-Side Driver

* Wide Operating VIN Range: Up to 60V

* Rugged Architecture Tolerant of 80V VIN Transients

* Powerful 1.85Ω Driver Pull-Down (with 6V Supply)

* Powerful 1.1A Peak Current Driver Pull-Up (with 6V Supply)

* 7ns Fall Time Driving 1000pF Load

* 10ns Rise Time Driving 1000pF Load

* Drives Standard Threshold MOSFETs

* TTL/CMOS Compatible Inputs with Hysteresis

* Input Thresholds are Independent of Supply

* Undervoltage Lockout

* Low Profile (1mm) SOT-23 (ThinSOT™) and Thermally Enhanced 8-Pin MSOP Packages