Features

• Bootstrap Supply Voltage Up to 114V
• Wide V_CC Voltage: 7.2V to 13.5V
• 2.5A Peak Top Gate Pull-Up Current
• 3A Peak Bottom Gate Pull-Up Current
• 1.2Ω Top Gate Driver Pull-Down
• 0.55Ω Bottom Gate Driver Pull-Down
• 5ns Top Gate Fall Time Driving 1nF Load
• 8ns Top Gate Rise Time Driving 1nF Load
• 3ns Bottom Gate Fall Time Driving 1nF Load
• 6ns Bottom Gate Rise Time Driving 1nF Load
• Drives Both High and Low Side N-Channel MOSFETs
• Undervoltage Lockout
• Thermally Enhanced 8-Pin MSOP Package

Typical Application

Description

The LTC4446 is a high frequency high voltage gate driver that drives two N-channel MOSFETs in a DC/DC converter with supply voltages up to 100V. The powerful driver capability reduces switching losses in MOSFETs with high gate capacitance. The LTC4446’s pull-up for the top gate driver has a peak output current of 2.5A and its pull-down has an output impedance of 1.2Ω. The pull-up for the bot- tom gate driver has a peak output current of 3A and the pull-down has an output impedance of 0.55Ω.

The LTC4446 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 LTC4446 contains undervoltage lockout circuits that disable the external MOSFETs when activated.

The LTC4446 is available in the thermally enhanced 8-lead MSOP package.

The LTC4446 does not have adaptive shoot-through protection. For similar drivers with adaptive shoot-through protection, please refer to the chart below.

PARAMETER	LTC4446	LTC4444	LTC4444-5
Shoot-Through Protection	No	Yes	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	3.5V