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New Generation Switching Power Manager with USB On-the-Go
 

New Generation Switching Power Manager with USB On-the-Go

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Introduction of the key features of the LTC3576, its basic operation and typical applications

Introduction of the key features of the LTC3576, its basic operation and typical applications

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    New Generation Switching Power Manager with USB On-the-Go New Generation Switching Power Manager with USB On-the-Go Presentation Transcript

    • New Generation Switching Power Manager with USB On-the-Go
      • Source: LINEAR TECHNOLOGY
    • Introduction
      • Purpose
        • This training module introduces the key features of the LTC3576, its basic operation and typical applications.
      • Outline
        • Key features of the LTC3576
        • Internal functional circuits
        • Typical applications
      • Content
        • 17 pages
    • Design Challenges for USB-capable Charger
      • USB-capable battery charging in many cases means more convenience to the user.
      • However, there are some limitations when the USB is used for charging the device’s batteries.
      • The main challenges for the system designer include:
        • Maximizing current delivered from the USB port
        • Managing power flow between multiple input voltage sources, the battery and load
        • Minimizing heat
        • Maximizing charging efficiency
        • Minimizing solution footprint and profile
    • A Solution for the Challenges - LTC3576
      • The LTC3576 is a member in a family of multifunction power management IC. It consists of:
        • A bidirectional switching power manager with input overvoltage protection and USB On-The-Go (OTG) functionality
        • A stand-alone battery charger
        • Three high efficiency synchronous buck regulators
        • An ideal diode
        • I 2 C control
        • An always-on LDO
      • The LTC3576 is available in a low profile 38-pin (4mm x 6mm x 0.75mm) QFN package.
      • The LTC3576 is designed to make optimal use of the power available from a variety of sources, while minimizing power dissipation and easing thermal budgeting constraints.
    • PowerPath Control
      • Benefits:
        • Bat-Track adaptive output control capability with an external high-voltage buck regulator
        • Improved thermal performance with power flowing to the system load
        • Improving power delivery efficiency to the system load and to the battery
      USB Power in Power Out Step down regulator USB Current Limit Program & Monitor
    • USB On-the-Go (OTG)
      • The bidirectional PowerPath switching regulator acts as a step-up converter to deliver power from V OUT to V BUS .
    • Input Current Limit Program
      • The current limit value has 5 settings ranging from 500 µA to 1A.
      • The input current limit is programmed by
        • I LIM0 & I LIM1 pins
        • I 2 C serial port
      High Power Suspend (USB 2.5mA Limit) 0 1 1 X 0 X X D6 5x Mode (USB 100mA Limit) 1 1 Low Power Suspend (USB 500 µ A Limit) 0 1 10x Mode (Wall 1A Limit) 1 0 1x Mode (USB 100mA Limit) 0 0 USB Setting I LIM0 / C0 I LIM1 / C1
    • Bat-Track Control
      • ACPR: indicates the external switching regulator is suitable for used by LT3576.
      • Wall: determine when power is applied to the external regulator.
      • V C : Bat-Track external switching regulator control output.
      When external power is detected, the USB input is automatically disabled.
    • Ideal Diode
      • The ideal diode is always on and will respond quickly whenever V OUT drops below BAT.
      • The diode consists of a precision amplifier that controls the gate of an optional external ideal diode P-channel MOSFET.
    • Suspend LDO & Always-On LDO
      • Suspend LDO
      • If the LTC3576 are configured for USB suspend mode, the bidirectional switching regulator is disabled and the suspend LDO provides power to the VOUT pin.
      • The suspend LDO will prevent the battery from running down when the portable product has access to a suspended USB port.
      • 3.3V LDO Always-On LDO
      • This LDO is used to provide power to a system pushbutton controller, standby microcontroller or real time clock.
      • If the LDO3V3 output pin is not used, it should be disabled by connecting it to VOUT.
    • Battery Charge Control
      • The constant-current/constant-voltage battery charger features:
        • Automatic recharge
        • Automatic termination by safety timer
        • Low voltage trickle charging
        • Bad cell detection
        • Over-temperature charge pausing
      • Depending on available input power and external load conditions, the battery charger may or may not be able to charge at the full programmed rate.
      • The CHRG pin indicates the status of the battery charger.
    • I 2 C Interface
      • The LTC3576 may receive commands from a master device using 2-wire I 2 C interface.
      • The I 2 C port is designed to be operated at speeds of up to 400kHz.
      • The I 2 C serial port can be disabled by grounding the DVCC pin.
      Timing Diagram
    • General Purpose Step-down Regulators
      • Three operating modes to meet the different noise / power needs.
        • Pulse skip mode for moderate to heavy loads
        • Burst mode for light loads
        • LDO mode for light loads
    • USB On-the-Go Application
      • The LTC3576 as the host
      • The LTC3576 as the slave
      Fig 1 Fig 2
    • Typical Application 1
    • Typical Application 2 Same circuits to connect with the MCU, please refer to Application 1
    • Typical Application 3 Same circuits to connect with the MCU, please refer to Application 1
    • Additional Resource
      • For ordering the LTC357 switching power manager, please click the part list or
      • Call our sales hotline
      • For additional inquires contact our technical service hotline
      • For more product information go to
        • http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1037,C1773,P86476