LF21844N Half-Bridge Gate Driver Description Features LF21844N is a high voltage, high speed gate driver capable Floating high-side driver in bootstrap operation to of driving N-channel MOSFETs and IGBTs in a half bridge 600V configuration. The high voltage technology enables the Drives two N-channel MOSFETs or IGBTs in a half- LF21844Ns high side to switch to 600V in a bootstrap bridge configuration operation. 1.4A source / 1.7A sink output current capability The LF21844N logic inputs are compatible with standard TTL and CMOS levels (down to 3.3V) to interface easily Outputs tolerant to negative transients with controlling devices. The driver outputs feature high Programmable dead time to protect MOSFETs pulse current buffers designed for minimum driver cross Wide low-side gate driver supply voltage: conduction. Programmable dead time, by an external 10V to 20V resistor, provides more system level flexibility. Wide logic supply voltage offset voltage: -5V to 5V The LF21844N is offered in SOIC(N)-14 package. It operates Logic input (IN and SD*) 3.3V capability over the extended temperature range of -40 C to +125 C . Schmitt triggered logic inputs with internal pull up and pull down Under Voltage Lockout (UVLO) for high-side and low side drivers o o Extended temperature range:-40 C to +125 C Applications DC-DC Converters AC-DC Inverters Motor Controls Class D Power Amplifiers Typical Application SOIC(N)-14 Up to 600V Ordering Information LF21844N Year Year Week Week HO Part Package Pack / Qty Mark V V VVV CC BBB CC TO LOAD YYWW HININ IN V S LF21844NTR SOIC(N)-14 T&R / 2500 LF21844N SDLIN* SD* Lot ID DT COM R4 LO V SS V SS DS-LF21844N-R0 2 1LF21844N Half-Bridge Gate Driver 1 Specifications 1.1 Pin Diagrams O NC IN 1 14 SD* V 2 13 B V 3 12 HO SS DT 4 11 VS COM 5 NC 10 LO 6 NC 9 V CC 7 NC 8 Top View: SOIC(N)-14 LF21844N 1.2 Pin Descriptions Pin Pin Name Pin Type Description Logic input for high-side and low-side gate driver outputs IN 1 Input (HO and LO), in phase with HO 2 SD* Input Logic input for shutdow, active low. 3 V Power Logic ground SS 4 DT Output Programmable deadtime lead COM 5 Power Low-side return LO 6 Output Low-side gate drive output 7 V Power Low-side and logic fixed supply CC 11 V Power High-side floating supply return S 12 HO Output High-side gate drive output 13 V Power High-side floating supply B 8, 9, 10, 14 NC No Connect Not connected internally DS-LF21844N-R0 2 2