Overview
The LM3489QMMX/NOPB is a high-efficiency PFET switching regulator controller produced by Texas Instruments. This device is designed to facilitate the development of small, cost-effective switching buck regulators for a wide range of applications. It employs a hysteretic control architecture, which simplifies the design process by eliminating the need for control loop compensation. The LM3489QMMX/NOPB is particularly useful in applications requiring high efficiency, low component count, and ultra-low dropout voltage.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | - | 35 | V |
| Output Voltage Range | 1.239 | - | VIN | V |
| Internal Reference Voltage | 1.214 | 1.239 | 1.264 | V |
| Efficiency | - | 93% | - | % |
| Maximum Operating Frequency | - | - | > 1 MHz | Hz |
| Shutdown Current | 7 | 15 | - | µA |
| Package Type | - | - | VSSOP-8 | - |
| Operating Temperature Range | -40 | - | 125 | °C |
Key Features
- AEC-Q100 Grade 1 qualified for automotive applications.
- No control loop compensation required due to hysteretic control architecture.
- Wide input voltage range of 4.5 V to 35 V.
- Adjustable output voltage range from 1.239 V to VIN.
- High efficiency of up to 93%.
- ±1.3% (±2% over temperature) internal reference voltage.
- 100% duty cycle operation.
- Maximum operating frequency greater than 1 MHz.
- Current limit protection with adjustable threshold.
- Dedicated enable pin with shutdown mode drawing only 7 µA supply current.
- Ultra-low dropout and low component count.
Applications
- Set-Top Boxes
- DSL or Cable Modems
- PC/IA Systems
- Automotive PCs
- TFT Monitors
- Battery-Powered Portable Applications
- Distributed Power Systems
- Always-On Power Systems
- High-Power LED Drivers
- Automotive Systems
Q & A
- What is the input voltage range of the LM3489QMMX/NOPB?
The input voltage range is from 4.5 V to 35 V.
- What is the typical efficiency of the LM3489QMMX/NOPB?
The typical efficiency is up to 93%.
- What is the purpose of the enable pin on the LM3489QMMX/NOPB?
The enable pin can be used to enable or disable the device. Leaving it unconnected defaults to the enabled state.
- How does the LM3489QMMX/NOPB handle current limit protection?
Current limit protection is implemented by measuring the voltage across the PFET’s RDS(ON), and it can be adjusted with a single resistor.
- What is the operating temperature range of the LM3489QMMX/NOPB?
The operating temperature range is from -40°C to 125°C.
- What type of control architecture does the LM3489QMMX/NOPB use?
The LM3489QMMX/NOPB uses a hysteretic control architecture.
- Can the output voltage of the LM3489QMMX/NOPB be adjusted?
Yes, the output voltage can be adjusted using two external resistors.
- What is the maximum operating frequency of the LM3489QMMX/NOPB?
The maximum operating frequency is greater than 1 MHz.
- What is the shutdown current of the LM3489QMMX/NOPB?
The shutdown current is only 7 µA.
- Is the LM3489QMMX/NOPB qualified for automotive applications?
Yes, it is AEC-Q100 Grade 1 qualified.
