LM3485MMX/NOPB
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Texas Instruments LM3485MMX/NOPB

Manufacturer No:
LM3485MMX/NOPB
Manufacturer:
Texas Instruments
Package:
Tape & Reel (TR)
Description:
IC REG CTRLR BUCK 8VSSOP
Delivery:
Payment:
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Product Introduction

Overview

The LM3485MMX/NOPB, produced by Texas Instruments, is a high-efficiency PFET switching buck regulator controller. This device is designed to simplify the development of small, low-cost switching buck regulators for a wide range of applications. The LM3485 utilizes a hysteretic control architecture, which eliminates the need for control-loop compensation, making it easy to use and design with. It supports a wide input voltage range of 4.5 V to 35 V and can adjust the output voltage from 1.242 V to the input voltage level. The controller is known for its high efficiency, achieving up to 93% efficiency, and its ability to operate at 100% duty cycle, which is beneficial for ultralow dropout applications.

Key Specifications

Parameter Minimum Typical Maximum Unit
Supply Voltage 4.5 - 35 V
Operating Junction Temperature -40 - 125 °C
Output Voltage Range 1.242 - VIN V
Feedback Voltage 1.217 1.242 1.267 V
Comparator Hysteresis 10 15 20 mV
Quiescent Current at Ground Pin 250 400 - µA
Maximum Operating Frequency - - > 1 MHz -
Junction-to-Ambient Thermal Resistance - - 163.3 °C/W

Key Features

  • Easy-to-Use Control Methodology: The LM3485 uses a hysteretic control scheme that does not require control-loop compensation, simplifying the design process.
  • Wide Input Voltage Range: Supports input voltages from 4.5 V to 35 V.
  • Adjustable Output Voltage: The output voltage can be set from 1.242 V to the input voltage level using two external resistors.
  • High Efficiency: Achieves up to 93% efficiency and operates at 100% duty cycle for ultralow dropout applications.
  • Current Limit Protection: Includes a current limit protection circuit that turns the PFET off for approximately 9 µs when the inductor current is too high.
  • Low Component Count: The PFET architecture allows for a low component count and simple design.

Applications

The LM3485 is suitable for a variety of applications requiring efficient and compact DC-DC conversion. These include:

  • Portable Electronics: Such as smartphones, tablets, and laptops where space and efficiency are critical.
  • Industrial Power Supplies: For applications requiring reliable and efficient power conversion.
  • Automotive Systems: Where the wide input voltage range and high efficiency are beneficial.
  • Consumer Electronics: Including set-top boxes, gaming consoles, and other devices that require efficient power management.

Q & A

  1. What is the input voltage range of the LM3485?

    The LM3485 supports an input voltage range of 4.5 V to 35 V.

  2. How is the output voltage adjusted on the LM3485?

    The output voltage can be adjusted using two external resistors connected to the feedback pin (FB) and the adjust pin (ADJ).

  3. What is the maximum operating frequency of the LM3485?

    The LM3485 can operate at frequencies greater than 1 MHz.

  4. Does the LM3485 require control-loop compensation?

    No, the LM3485 uses a hysteretic control scheme that does not require control-loop compensation.

  5. What is the typical efficiency of the LM3485?

    The LM3485 can achieve up to 93% efficiency.

  6. How does the current limit protection work on the LM3485?

    The current limit protection circuit turns the PFET off for approximately 9 µs when the inductor current exceeds the set limit.

  7. What is the junction-to-ambient thermal resistance of the LM3485 in the VSSOP package?

    The junction-to-ambient thermal resistance is 163.3 °C/W.

  8. Can the LM3485 operate at 100% duty cycle?
  9. What are the typical operating modes of the LM3485?

    The LM3485 operates in either continuous conduction mode (CCM) at heavy loads or discontinuous conduction mode (DCM) at light loads.

  10. How does the feed-forward capacitor (Cff) affect the operation of the LM3485?

    The feed-forward capacitor (Cff) influences the operating frequency and output ripple voltage by sourcing or sinking current through it, affecting the hysteretic operation.

Product Attributes

Output Type:Transistor Driver
Function:Step-Down
Output Configuration:Positive
Topology:Buck
Number of Outputs:1
Output Phases:1
Voltage - Supply (Vcc/Vdd):4.5V ~ 35V
Frequency - Switching:- 
Duty Cycle (Max):100%
Synchronous Rectifier:No
Clock Sync:No
Serial Interfaces:- 
Control Features:- 
Operating Temperature:-40°C ~ 125°C (TJ)
Mounting Type:Surface Mount
Package / Case:8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package:8-VSSOP
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Similar Products

Part Number LM3485MMX/NOPB LM3488MMX/NOPB LM3489MMX/NOPB LM3481MMX/NOPB LM3485MM/NOPB
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Product Status Active Active Active Active Active
Output Type Transistor Driver Transistor Driver Transistor Driver Transistor Driver Transistor Driver
Function Step-Down Step-Up, Step-Up/Step-Down Step-Down Step-Up, Step-Up/Step-Down Step-Down
Output Configuration Positive Positive Positive Positive Positive
Topology Buck Boost, Flyback, SEPIC Buck Boost, Flyback, SEPIC Buck
Number of Outputs 1 1 1 1 1
Output Phases 1 1 1 1 1
Voltage - Supply (Vcc/Vdd) 4.5V ~ 35V 2.97V ~ 40V 4.5V ~ 35V 2.97V ~ 48V 4.5V ~ 35V
Frequency - Switching - 100kHz ~ 1MHz Up to 1MHz 100kHz ~ 1MHz -
Duty Cycle (Max) 100% 100% 100% 85% 100%
Synchronous Rectifier No No No No No
Clock Sync No Yes No Yes No
Serial Interfaces - - - - -
Control Features - Enable, Frequency Control Current Limit, Enable Enable, Frequency Control, Ramp, Soft Start -
Operating Temperature -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ) -40°C ~ 125°C (TJ)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package 8-VSSOP 8-VSSOP 8-VSSOP 10-VSSOP 8-VSSOP

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