規格
| 屬性 | 價值 |
| Package | Tape & Reel (TR),Cut Tape (CT),Bulk |
| ProductStatus | Not For New Designs |
| OutputType | Transistor Driver |
| Function | Step-Down |
| OutputConfiguration | Positive |
| Topology | Buck |
| NumberofOutputs | 1 |
| OutputPhases | 1 |
| Voltage-Supply(Vcc/Vdd) | 4.5V ~ 35V |
| DutyCycle(Max) | 100% |
| SynchronousRectifier | No |
| ClockSync | No |
| OperatingTemperature | -40°C ~ 125°C (TJ) |
| MountingType | Surface Mount |
| Package/Case | 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) |
概述
Description
The LM3485MM is a current mode, high-efficiency step-down switching regulator designed to convert a higher DC voltage to a lower DC voltage efficiently. It is part of Texas Instruments' product line. The device operates at a switching frequency of up to 1 MHz, enabling the use of smaller external components and allowing for a compact design.
Key features of the LM3485MM include a wide input voltage range, adjustable output voltage, and built-in protection features such as current limiting and thermal shutdown. It also supports adjustable switching frequency and soft-start capability to reduce inrush current during power-up. The regulator is typically used in applications such as point-of-load power supplies, distributed power systems, and battery-powered equipment.
The MM suffix indicates the device's package type, which is a small outline package (SOIC) with minimal footprint, suitable for space-constrained applications. As a highly integrated solution, the LM3485MM simplifies the design process for power management applications, offering flexibility, efficiency, and reliable performance.
Key features of the LM3485MM include a wide input voltage range, adjustable output voltage, and built-in protection features such as current limiting and thermal shutdown. It also supports adjustable switching frequency and soft-start capability to reduce inrush current during power-up. The regulator is typically used in applications such as point-of-load power supplies, distributed power systems, and battery-powered equipment.
The MM suffix indicates the device's package type, which is a small outline package (SOIC) with minimal footprint, suitable for space-constrained applications. As a highly integrated solution, the LM3485MM simplifies the design process for power management applications, offering flexibility, efficiency, and reliable performance.
Equivalent
The LM3485MM is a DC-DC converter controller. Equivalent products include:
1. TPS40170 by Texas Instruments
2. LTC1624 by Analog Devices
3. MC34063 by ON Semiconductor
4. MAX1771 by Maxim Integrated
5. FAN2106 by ON Semiconductor (formerly Fairchild Semiconductor)
These alternatives might have different specifications, so it's essential to compare them based on your specific application requirements. Always check the datasheets for compatibility.
1. TPS40170 by Texas Instruments
2. LTC1624 by Analog Devices
3. MC34063 by ON Semiconductor
4. MAX1771 by Maxim Integrated
5. FAN2106 by ON Semiconductor (formerly Fairchild Semiconductor)
These alternatives might have different specifications, so it's essential to compare them based on your specific application requirements. Always check the datasheets for compatibility.
Features
The LM3485MM is a voltage-mode pulse-width modulation (PWM) controller designed for step-down (buck) DC-DC converter applications. Key features include:
1. Wide Input Voltage Range: Operates from a 2.97V to 5.5V input range, making it suitable for a variety of applications including battery-powered devices.
2. Adjustable Output Voltage: Supports a wide output voltage range, allowing flexibility in meeting specific application requirements.
3. High Efficiency: Designed to deliver high efficiency over a wide load range, reducing power loss and improving thermal performance.
4. Integrated MOSFET Driver: Features an internal MOSFET driver capable of driving external N-channel MOSFETs, enhancing design flexibility.
5. Adjustable Switching Frequency: Offers a programmable switching frequency range from 100 kHz to 1 MHz, allowing optimization for efficiency or size.
6. Current Limit Protection: Includes a current limit feature to protect against overcurrent conditions.
7. Thermal Shutdown: Provides thermal protection to prevent damage from overheating.
8. Compact Package: Available in a small MSOP-8 package, suitable for space-constrained applications.
These features make the LM3485MM ideal for compact, efficient power management solutions in portable electronics and other low-power applications.
1. Wide Input Voltage Range: Operates from a 2.97V to 5.5V input range, making it suitable for a variety of applications including battery-powered devices.
2. Adjustable Output Voltage: Supports a wide output voltage range, allowing flexibility in meeting specific application requirements.
3. High Efficiency: Designed to deliver high efficiency over a wide load range, reducing power loss and improving thermal performance.
4. Integrated MOSFET Driver: Features an internal MOSFET driver capable of driving external N-channel MOSFETs, enhancing design flexibility.
5. Adjustable Switching Frequency: Offers a programmable switching frequency range from 100 kHz to 1 MHz, allowing optimization for efficiency or size.
6. Current Limit Protection: Includes a current limit feature to protect against overcurrent conditions.
7. Thermal Shutdown: Provides thermal protection to prevent damage from overheating.
8. Compact Package: Available in a small MSOP-8 package, suitable for space-constrained applications.
These features make the LM3485MM ideal for compact, efficient power management solutions in portable electronics and other low-power applications.
Pinout
The LM3485MM is a high-efficiency, simple-to-use, buck (step-down) switching regulator controller IC. It typically comes in an 8-pin MSOP (Mini Small Outline Package). Here's a brief overview of the pin functions:
1. SW (Pin 1): Switch node; connected to the inductor.
2. BST (Pin 2): Boost pin; used to drive the gate of the high-side N-channel MOSFET.
3. FB (Pin 3): Feedback pin; connects to the output voltage divider to set the output voltage.
4. GND (Pin 4): Ground pin; common ground for the controller.
5. UVLO (Pin 5): Undervoltage lockout pin; sets the input voltage level for the controller to start operating.
6. VCC (Pin 6): Supply voltage pin; powers the internal circuitry.
7. COMP (Pin 7): Compensation pin; used with external components to stabilize the control loop.
8. PGATE (Pin 8): Gate drive pin; drives the gate of the external N-channel MOSFET.
These pins work together to regulate the output voltage by controlling the switching of an external MOSFET.
1. SW (Pin 1): Switch node; connected to the inductor.
2. BST (Pin 2): Boost pin; used to drive the gate of the high-side N-channel MOSFET.
3. FB (Pin 3): Feedback pin; connects to the output voltage divider to set the output voltage.
4. GND (Pin 4): Ground pin; common ground for the controller.
5. UVLO (Pin 5): Undervoltage lockout pin; sets the input voltage level for the controller to start operating.
6. VCC (Pin 6): Supply voltage pin; powers the internal circuitry.
7. COMP (Pin 7): Compensation pin; used with external components to stabilize the control loop.
8. PGATE (Pin 8): Gate drive pin; drives the gate of the external N-channel MOSFET.
These pins work together to regulate the output voltage by controlling the switching of an external MOSFET.
Manufacturer
The LM3485MM is manufactured by Texas Instruments (TI), a leading American technology company. Texas Instruments is renowned for designing and manufacturing semiconductors and various integrated circuits, which are used in a wide array of electronic devices. The company is a major player in the electronics industry, providing products and solutions for industries such as automotive, industrial, personal electronics, communications equipment, and enterprise systems. TI's focus on innovation and quality has made it a key supplier of electronic components worldwide, and it is known for its contributions to analog technology, embedded processing, and digital light processing.
Application
The LM3485MM is a versatile DC-DC buck controller used primarily in power management applications. It is suitable for step-down voltage regulation in a wide range of electronic devices. Key application areas include telecommunications equipment, industrial systems, and consumer electronics. It is often employed in battery-powered devices, point-of-load conversions, and distributed power systems due to its high efficiency and compact design. The LM3485MM is also used in applications requiring low output voltage ripple and fast transient response, making it ideal for use in sensors, microcontrollers, and other sensitive electronic components.
Package
The LM3485MM is a DC-DC synchronous buck controller that utilizes a Mini Small Outline Package (MSOP-8). This package is compact, featuring eight pins, and is designed for efficient thermal performance and space-saving in electronic circuit designs.
