Overview
The LM3489QMM/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 LM3489QMM/NOPB is particularly useful in scenarios where high efficiency, low component count, and ultra-low dropout are crucial.
Key Specifications
| Specification | Value |
|---|---|
| Package | VSSOP (DGK) with 8 pins |
| Operating Temperature Range | -40°C to 125°C |
| Input Voltage Range | 4.5V to 35V |
| Output Voltage Range | 1.239V to VIN |
| Efficiency | Up to 93% |
| Internal Reference Accuracy | ±1.3% (±2% over temperature) |
| Maximum Operation Frequency | > 1 MHz |
| Duty Cycle Operation | 100% |
| Current Limit Protection | Yes, cycle-by-cycle |
| Enable Pin | Dedicated, on if unconnected |
| Shutdown Mode Supply Current | 7 µA |
Key Features
- AEC-Q100 Grade 1 qualified for automotive applications
- Easy-to-use control methodology with no control loop compensation required
- Wide 4.5-V to 35-V input range and 1.239 V to VIN adjustable output range
- High efficiency of up to 93%
- ±1.3% (±2% over temperature) internal reference accuracy
- 100% duty cycle operation and maximum operation frequency > 1 MHz
- Current limit protection with cycle-by-cycle adjustment
- Dedicated enable pin (on if unconnected) and shutdown mode drawing only 7 µA supply current
- 8-Pin VSSOP package
Applications
- Set-Top Boxes
- DSL/Cable Modems
- PC/IA and Auto PCs
- TFT Monitors
- Battery-Powered Portable Applications
- Distributed Power Systems
- Always-On Power
- High-Power LED Drivers
- Automotive systems
Q & A
- What is the operating temperature range of the LM3489QMM/NOPB?
The operating temperature range is -40°C to 125°C. - What is the input voltage range for this device?
The input voltage range is 4.5V to 35V. - How is the output voltage adjusted?
The output voltage can be set in a wide range from 1.239V to VIN using two external resistors. - What is the efficiency of the LM3489QMM/NOPB?
The efficiency is up to 93%. - Does the LM3489QMM/NOPB require control loop compensation?
No, it does not require control loop compensation due to its hysteretic control architecture. - What is the maximum operation frequency of the LM3489QMM/NOPB?
The maximum operation frequency is greater than 1 MHz. - How does the current limit protection work?
The current limit protection can be implemented by measuring the voltage across the PFETs, and it can be adjusted with a single resistor. - What is the purpose of the dedicated enable pin?
The dedicated enable pin allows for shutdown mode, drawing only 7 µA supply current, and defaults to on if left unconnected. - In what package is the LM3489QMM/NOPB available?
The device is available in an 8-pin VSSOP (DGK) package. - Is the LM3489QMM/NOPB qualified for automotive use?
Yes, it is AEC-Q100 Grade 1 qualified for automotive applications.
