LT1158

Supply Voltage (Pins 2, 10) .................................... 36V
Boost Voltage (Pin 16)............................................ 56V
Continuous Output Currents (Pins 1, 9, 15) ....... 100mA
Sense Voltages (Pins 11, 12)................... 5V to V++5V
Top Source Voltage (Pin 13).................... 5V to V++5V
Boost to Source Voltage (V16  V13) ....... 0.3V to 20V
Operating Temperature Range
LT1158C ................................................ 0°C to 70°C
LT1158I ............................................ 40°C to 85°C
Junction Temperature (Note 1)
LT1158C .......................................................... 125°C
LT1158I ........................................................... 150°C
Storage Temperature Range ........... 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)............. 300°C


Description

A single input pin on the LT1158 synchronously controls two N-channel power MOSFETs in a totem pole configuration. Unique adaptive protection against shoot-through currents eliminates all matching requirements for the two MOSFETs. This greatly eases the design of high efficiency motor control and switching regulator systems. 

A continuous current limit loop in the LT1158 regulates short-circuit current in the top power MOSFET. Higher start-up currents are allowed as long as the MOSFET VDS does not exceed 1.2V. By returning the fault output to the enable input, the LT1158 will automatically shut down in the event of a fault and retry when an internal pull-up current has recharged the enable capacitor.

An on-chip charge pump is switched in when needed to turn on the top N-channel MOSFET continuously. Special circuitry ensures that the top side gate drive is safely maintained in the transition between PWM and DC operation. The gate-to-source voltages are internally limited to 14.5V when operating at higher supply voltages.