Overview
The LM3489MM from Texas Instruments is a high-efficiency PFET switching regulator controller designed to facilitate the development of small, cost-effective switching buck regulators. This device employs a hysteretic control architecture, which simplifies the design process by eliminating the need for control loop compensation. The LM3489MM is suitable for a wide range of applications due to its wide input voltage range, adjustable output voltage, and high efficiency operation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 4.5 | - | 35 | V |
| Output Voltage Range | 1.239 | - | VIN | V |
| Maximum Operating Temperature | -40 | - | 125 | °C |
| Maximum Operation Frequency | - | - | > 1 MHz | - |
| Efficiency | - | - | 93% | - |
| Internal Reference Accuracy | ±1.3% (±2% over temperature) | - | - | - |
| Shutdown Supply Current | 7 | - | - | µA |
| Package Type | - | - | 8-Pin VSSOP/MSOP | - |
| Dimensions | - | - | 3 x 3 x 0.86 mm | - |
Key Features
- Qualified for Automotive Parts and AEC-Q100 certified with a temperature range of –40°C to 125°C.
- Easy-to-use control methodology with no control loop compensation required.
- Wide input voltage range of 4.5 V to 35 V and adjustable output voltage range from 1.239 V to VIN.
- High efficiency of up to 93% and internal reference accuracy of ±1.3% (±2% over temperature).
- 100% duty cycle operation and maximum operation frequency greater than 1 MHz.
- Current limit protection with cycle-by-cycle current limit adjustment using a single resistor.
- Dedicated enable pin for shutdown mode, drawing only 7 µA of supply current.
- Ultra-low dropout and 100% duty cycle operation due to PFET architecture.
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 input voltage range of the LM3489MM?
The input voltage range of the LM3489MM is from 4.5 V to 35 V.
- What is the output voltage range of the LM3489MM?
The output voltage range is adjustable from 1.239 V to VIN.
- What is the maximum operating temperature of the LM3489MM?
The maximum operating temperature is 125°C, with an ambient operating temperature range of –40°C to 125°C.
- What is the efficiency of the LM3489MM?
The LM3489MM operates with an efficiency of up to 93%.
- Does the LM3489MM require control loop compensation?
No, the LM3489MM does not require control loop compensation due to its hysteretic control architecture.
- How is current limit protection implemented in the LM3489MM?
Current limit protection is implemented by measuring the voltage across the PFET's R_DS(ON) or an additional sense resistor, and can be adjusted with a single external resistor.
- What is the shutdown supply current of the LM3489MM?
The shutdown supply current is only 7 µA.
- What package types are available for the LM3489MM?
The LM3489MM is available in an 8-Pin VSSOP or MSOP package.
- What are the dimensions of the LM3489MM package?
The dimensions of the package are 3 x 3 x 0.86 mm.
- Is the LM3489MM suitable for automotive applications?
