High Voltage Synchronous N-Channel MOSFET Driver

The LTC4444 is a high frequency high voltage gate driver that drives two N-channel MOSFETs in a synchronous DC/DC converter with supply voltages up to 100V. This powerful driver reduces switching losses in MOSFETs with high gate capacitance.

The LTC4444 is configured for two supply-independent inputs. The high side input logic signal is internally level-shifted to the bootstrapped supply, which may function at up to 114V above ground.

The LTC4444 contains undervoltage lockout circuits that disable the external MOSFETs when activated. Adaptive shoot-through protection prevents both MOSFETs from conducting simultaneously.

For a similar driver in this product family, please refer to the chart below.

Parameter

LTC4444

LTC4446

LTC4444-5

Shoot-Through Protection

Yes

No

Yes

Absolute Max TS

100V

100V

100V

MOSFET Gate Drive

7.2V to 13.5V

7.2V to 13.5V

4.5V to 13.5V

VCC UV+

6.6V

6.6V

4V

VCC UV–

6.15V

6.15V

3.55V

Applications

* Distributed Power Architectures

* Automotive Power Supplies

* High Density Power Modules

* Telecommunications

* AEC-Q100 Qualified for Automotive Applications

* Bootstrap Supply Voltage to 114V

* Wide VCC Voltage: 7.2V to 13.5V

* Adaptive Shoot-Through Protection

* 2.5A Peak TG Pull-Up Current

* 3A Peak BG Pull-Up Current

* 1.2Ω TG Driver Pull-Down

* 0.55Ω BG Driver Pull-Down