LM9061

Contents

The LM9061 is a charge-pump device which provides the gate drive to any size external power MOSFET configured as a high side driver or switch. A CMOS logic compatible ON/OFF input controls the output gate drive voltage. In the ON state, the charge pump voltage, which is well above the available V_CC supply, is directly applied to the gate of the MOSFET. A built-in 15V zener clamps the maximum gate to source voltage of the MOSFET. When commanded OFF a 110 µA current sink discharges the gate capacitances of the MOSFET for a gradual turn-OFF characteristic to minimize the duration of inductive load transient voltages and further protect the power MOSFET.

Lossless protection of the power MOSFET is a key feature of the LM9061. The voltage drop (V_DS) across the power device is continually monitored and compared against an externally programmable threshold voltage. A small current sensing resistor in series with the load, which causes a loss of available energy, is not required for the protection circuitry. Should the V_DS voltage, due to excessive load current, exceed the threshold voltage, the output is latched OFF in a more gradual fashion (through a 10 µA output current sink) after a programmable delay time interval.

Designed for the automotive application environment the LM9061 has a wide operating temperature range of -40°C to +125°C, remains operational with V_CC up to 26V, and can withstand 60V power supply transients. The LM9061 is available in an 8-pin small outline package, and an 8-pin dual in-line package.

• Built-in charge pump for gate overdrive of high side drive applications
• Lossless protection of the power MOSFET
• Programmable MOSFET protection voltage
• Programmable delay of protection latch-OFF
• Fast turn-ON (1.5 ms max with gate capacitance of 25000 pF)
• Undervoltage shut OFF with V_CC < 7V
• Overvoltage shut OFF with V_CC > 26V
• Withstands 60V supply transients
• CMOS logic compatible ON/OFF control input
• Surface mount and dual in-line packages available

• Valve, relay and solenoid drivers
• Lamp drivers
• DC motor PWM drivers
• Logic controlled power supply distribution switch
• Electronic circuit breaker