LM3485MMX
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National Semiconductor LM3485MMX

Manufacturer No:
LM3485MMX
Manufacturer:
National Semiconductor
Package:
Bulk
Description:
0.1A, 1000KHZ PDSO8
Delivery:
Payment:
iso14001
iso45001
iso9001
iso13485

Product Introduction

Overview

The LM3485MMX is a high-efficiency PFET buck controller from Texas Instruments. It is designed to facilitate the development of small, low-cost, switching buck regulators for a wide range of applications. The hysteretic control architecture of the LM3485MMX simplifies the design process by eliminating the need for control-loop compensation. This controller operates over a wide input voltage range of 4.5 V to 35 V and can adjust the output voltage from 1.242 V to VIN, making it versatile for various power management needs.

Key Specifications

ParameterMinMaxUnit
Input Voltage Range4.5-35V
Output Voltage Range1.242-VINV
Operating Junction Temperature-40-125°C
Maximum Operating Frequency--> 1 MHz-
Quiescent Current at Ground Pin250400-µA
Feedback Voltage1.2171.2421.267V
Comparator Hysteresis101520mV
Current Limit Comparator Trip Voltage110-880mV
Package--VSSOP-8-

Key Features

  • Easy-to-use hysteretic control methodology without the need for control-loop compensation.
  • No external sense resistor required for current limit protection.
  • High efficiency operation with up to 93% efficiency.
  • 100% duty cycle operation for ultralow dropout.
  • Adjustable output voltage using two external resistors.
  • Operating frequency reduces at light loads for excellent efficiency.
  • Feed-forward capacitor (Cff) for reducing output ripple and increasing operating frequency.

Applications

  • Set-Top Box
  • DSL or Cable Modem
  • PC/IA
  • Auto PC Device
  • TFT Monitor
  • Battery-Powered Portable Applications
  • Distributed Power Systems

Q & A

  1. What is the input voltage range of the LM3485MMX? The input voltage range is from 4.5 V to 35 V.
  2. How is the output voltage adjusted? The output voltage can be adjusted using two external resistors.
  3. What is the typical efficiency of the LM3485MMX? The typical efficiency is up to 93%.
  4. Does the LM3485MMX require an external sense resistor for current limit protection? No, it does not require an external sense resistor.
  5. What is the maximum operating frequency of the LM3485MMX? The maximum operating frequency is greater than 1 MHz.
  6. What is the package type of the LM3485MMX? The package type is VSSOP-8.
  7. What are some common applications of the LM3485MMX? Common applications include set-top boxes, DSL or cable modems, PC/IA devices, auto PC devices, TFT monitors, battery-powered portable applications, and distributed power systems.
  8. How does the hysteretic control architecture benefit the design process? The hysteretic control architecture simplifies the design by eliminating the need for control-loop compensation.
  9. What is the role of the feed-forward capacitor (Cff) in the LM3485MMX? The feed-forward capacitor reduces output ripple and increases the operating frequency.
  10. What is the operating junction temperature range of the LM3485MMX? The operating junction temperature range is from -40°C to 125°C.

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:50kHz ~ 1MHz
Duty Cycle (Max):100%
Synchronous Rectifier:No
Clock Sync:No
Serial Interfaces:- 
Control Features:Enable
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 LM3489MMX LM3488MMX LM3485MM
Manufacturer National Semiconductor National Semiconductor Texas Instruments National Semiconductor
Product Status Active Active Obsolete Active
Output Type Transistor Driver Transistor Driver Transistor Driver Transistor Driver
Function Step-Down Step-Down Step-Up, Step-Up/Step-Down Step-Down
Output Configuration Positive Positive Positive Positive
Topology Buck Buck Boost, Flyback, SEPIC Buck
Number of Outputs 1 1 1 1
Output Phases 1 1 1 1
Voltage - Supply (Vcc/Vdd) 4.5V ~ 35V 4.5V ~ 35V 2.97V ~ 40V 4.5V ~ 35V
Frequency - Switching 50kHz ~ 1MHz Up to 1MHz 100kHz ~ 1MHz 50kHz ~ 1MHz
Duty Cycle (Max) 100% 100% 100% 100%
Synchronous Rectifier No No No No
Clock Sync No No Yes No
Serial Interfaces - - - -
Control Features Enable Current Limit, Enable Enable, Frequency Control Enable
Operating Temperature -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
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) 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package 8-VSSOP 8-VSSOP 8-VSSOP 8-VSSOP

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