Overview
The LM9061MX/NOPB, produced by Texas Instruments, is a high-side protection controller designed to protect loads from overcurrent and overvoltage conditions. This device is part of the LM9061 family, which includes the LM9061 and LM9061-Q1 models. The LM9061MX/NOPB is particularly suited for high-side drive applications, where it controls the gate drive of an external power MOSFET. It features a built-in charge pump that generates a gate voltage exceeding the supply voltage, ensuring the MOSFET remains in an ON state even when the source voltage is near the supply potential.
The device is qualified for automotive applications and meets AEC-Q100 standards, making it reliable for use in demanding environments. It also includes lossless overcurrent protection, programmable delay for protection latch-off, and gradual turnoff to minimize inductive load transient voltages.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage (VCC) | 7 | 60 | V |
| Output Voltage | VCC + 15 | V | |
| Voltage at Sense and Threshold | -25 | 60 | V |
| ON/OFF Input Voltage | -0.3 | VCC + 0.3 | V |
| Junction-to-Ambient Thermal Resistance (RθJA) | 150 | °C/W | |
| Junction-to-Case (Top) Thermal Resistance (RθJC) | 46.7 | °C/W | |
| Junction-to-Board Thermal Resistance (RθJB) | 49.1 | °C/W | |
| Operating Temperature Range | -40 | 125 | °C |
Key Features
- Qualified for automotive applications and AEC-Q100 certified.
- Withstands 60-V supply transients and overvoltage shut-off with VCC > 30 V.
- Lossless overcurrent protection without requiring a current-sensing resistor.
- Programmable delay for protection latch-off.
- Gradual turnoff to minimize inductive load transient voltages.
- CMOS logic-compatible ON and OFF control input.
- Built-in 15-V Zener clamp to limit the maximum gate to source voltage of the MOSFET.
- Internal charge pump generates gate voltage exceeding the supply voltage.
Applications
- Transmission Control Units (TCU).
- Engine Control Units (ECU).
- Valve, relay, and solenoid drivers.
- Lamp drivers.
- DC motor PWM drivers.
- Logic-controlled power supply distribution switches.
- Electronic circuit breakers.
- High-power audio speakers.
Q & A
- What is the primary function of the LM9061MX/NOPB?
The primary function of the LM9061MX/NOPB is to protect loads from overcurrent and overvoltage conditions by controlling the gate drive of an external power MOSFET.
- What are the key features of the LM9061MX/NOPB?
The key features include lossless overcurrent protection, programmable delay for protection latch-off, gradual turnoff, CMOS logic-compatible ON and OFF control, and built-in 15-V Zener clamp.
- What is the operating voltage range of the LM9061MX/NOPB?
The operating voltage range is from 7 V to 60 V.
- Is the LM9061MX/NOPB suitable for automotive applications?
- How does the LM9061MX/NOPB protect against overcurrent?
The device monitors the voltage drop (VDS) across the MOSFET and latches off the output if the VDS exceeds a programmable threshold voltage.
- What is the purpose of the internal charge pump in the LM9061MX/NOPB?
The internal charge pump generates a gate voltage exceeding the supply voltage to ensure the MOSFET remains in an ON state.
- How does the LM9061MX/NOPB handle overvoltage conditions?
The device turns off the MOSFET if VCC exceeds 30 V and returns to normal operation once VCC is within the normal operating range.
- What is the significance of the programmable delay in the LM9061MX/NOPB?
The programmable delay allows for a customizable time interval before the output is latched off in response to overcurrent or overvoltage conditions.
- What are some common applications of the LM9061MX/NOPB?
Common applications include transmission control units, engine control units, valve and solenoid drivers, lamp drivers, DC motor PWM drivers, and electronic circuit breakers.
- How does the LM9061MX/NOPB minimize inductive load transient voltages?
The device features a gradual turnoff characteristic through a 110-µA current sink to discharge the gate capacitances of the MOSFET.
