Overview
The LM3489MMX/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. The LM3489 utilizes a hysteretic control architecture, which simplifies the design process by eliminating the need for control loop compensation. This architecture also allows for low component count and ultra-low dropout, enabling 100% duty cycle operation. The device is particularly beneficial for applications requiring high efficiency, especially at light loads, without an increase in output ripple.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VSSOP-8 | |
| Operating Temperature Range | -40 to 125 | °C |
| Input Voltage Range | 4.5 to 35 | V |
| Output Voltage Range | 1.239 V to VIN | V |
| Efficiency | Up to 93% | % |
| Internal Reference Accuracy | ±1.3% (±2% over temperature) | % |
| Maximum Operation Frequency | > 1 MHz | Hz |
| Shutdown Supply Current | 7 µA | A |
| Current Limit Protection | Cycle-by-cycle current limit adjustable with a single resistor |
Key Features
- Qualified for Automotive Parts and AEC-Q100 Qualified
- Easy-to-use control methodology with no control loop compensation required
- Wide 4.5-V to 35-V input range and adjustable output range from 1.239 V to VIN
- High efficiency operation up to 93%
- ±1.3% (±2% over temperature) internal reference accuracy
- 100% duty cycle operation and maximum operation frequency > 1 MHz
- Dedicated enable pin with shutdown mode drawing only 7 µA supply current
- Current limit protection with cycle-by-cycle current limit adjustable with a single resistor
- 8-Pin VSSOP package
Applications
- Set-Top Boxes
- DSL or Cable Modems
- PC/IA
- 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 LM3489MMX/NOPB?
The operating temperature range is -40°C to 125°C.
- What is the input voltage range for the LM3489MMX/NOPB?
The input voltage range is 4.5 V to 35 V.
- How is the output voltage adjusted on the LM3489MMX/NOPB?
The output voltage can be adjusted using two external resistors connected to the feedback pin (FB).
- What is the maximum operation frequency of the LM3489MMX/NOPB?
The maximum operation frequency is greater than 1 MHz.
- Does the LM3489MMX/NOPB have current limit protection?
- How does the enable pin function on the LM3489MMX/NOPB?
The enable pin can be connected to ground to shut down the device or left unconnected to enable operation. It also supports UVLO (Under-Voltage Lockout) function.
- What is the shutdown supply current of the LM3489MMX/NOPB?
The shutdown supply current is 7 µA.
- Is the LM3489MMX/NOPB qualified for automotive applications?
- What type of control architecture does the LM3489MMX/NOPB use?
The LM3489MMX/NOPB uses a hysteretic control architecture.
- What is the package type of the LM3489MMX/NOPB?
The package type is 8-Pin VSSOP.
