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Datasheet Linear Technology LTC4055-1

ManufacturerLinear Technology

USB Power Controller and Li-Ion Linear Charger


  • Download » Datasheet PDF, 304 Kb, Revision: B, File uploaded: Oct 22, 2017
    LTC4055/LTC4055-1 - USB Power Controller and Li-Ion Linear Charger
    Docket ↓
    USB Power Controller
    and Li-Ion Charger
    FEATURES DESCRIPTION n The LTCВ®4055/LTC4055-1 are USB power manager and
    Li-Ion battery chargers designed to work in portable
    battery-powered applications. The parts manage and limit
    the total current used by the USB peripheral for operation
    and battery charging. Depending on the state of the current
    select pin (HPWR), total input current can be limited to
    either 100mA or 500mA. The voltage drop from the USB
    supply or battery to the USB peripheral is typically less than
    100mV at 400mA and 20mV at 80mA. Other management
    features include: automatic switchover to battery when
    input is removed, inrush current limiting, reverse current
    blocking, undervoltage lockout and thermal shutdown. n APPLICATIONS
    n Portable USB Devices: Cameras, MP3 Players, PDAs L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
    PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
    property of their respective owners. *Protected by U.S. Patent, including 6522118. The LTC4055/LTC4055-1 include a complete constantcurrent/constant-voltage linear charger for single-cell
    Li-ion batteries. The float voltage applied to the battery
    is held to a tight 0.8% tolerance, and charge current is
    programmable using an external resistor to ground. Fully
    discharged cells are automatically trickle charged at 10%
    of the programmed current until the cell voltage exceeds ...



Package4x4 QFN-16
Package Outline Drawing
4x4 QFN-16
Package Outline Drawing
Package CodeUFUF
Package Index05-08-169205-08-1692
Pin Count1616


Battery ChemistryLi-Ion, Li-PolymerLi-Ion, Li-Polymer
Demo BoardsDC676ADC676A
Export Controlnono
FeaturesDual Input, PowerPathDual Input, PowerPath
Float Voltage, V4.1V, 4.2V4.1V, 4.2V
Max Charge Current, A1.251.25
Number of Cells11
Number of Outputs11
Operating Temperature Range, °C0 to 850 to 85
PowerPathLinear PowerPath, 200mΩ Internal Ideal DiodeLinear PowerPath, 200mΩ Internal Ideal Diode
Type of ChargerLinearLinear
Vin Max, V5.55.5
Vin Min, V4.34.3

Eco Plan

Other Options


Design Notes

  • Download » Design Notes - DN336 PDF, 74 Kb, File published: Apr 3, 2004
    Advanced Topology USB Battery Charger Optimizes Power Utilization for Faster Charging
    Docket ↓
    Advanced Topology USB Battery Charger Optimizes Power
    Utilization for Faster Charging – Design Note 336
    John Shannon
    Linear Technology offers a variety of parts to simplify
    the task of extracting power from a USB cable, including
    the new, easy-to-use LTCВ®4055 high performance Li-Ion
    charger and power controller. The LTC4055 seamlessly
    manages power flow between an AC adapter, USB cable
    and Li-Ion battery, all while maintaining USB power
    specification compliance.
    Thanks to its sophisticated intermediate voltage bus
    topology, the LTC4055 charges batteries faster with
    less heat generation than a traditional charger-fed
    topology. Better yet, a typical LTC4055-based USB
    charger solution is compact and requires only 10
    external components and 100mm2 of PCB real estate.
    Benefits of the LTC4055
    In order to fully appreciate the benefits of the LTC4055,
    let us п¬Ѓrst analyze the difference between the intermediate voltage bus topology and a charger fed topology.
    Figure 1 is a simplified block diagram of the two power
    topologies. In the intermediate bus voltage topology,
    the output called VMAX is derived from one of the three
    available power sources—wall adapter, USB or battery. ...
  • Download » Design Notes - DN361 PDF, 82 Kb, File published: Feb 17, 2005
    Simple Battery Circuit Extends Power over Ethernet (PoE) Peak Current
    Docket ↓
    Simple Battery Circuit Extends Power over Ethernet (POE)
    Peak Current – Design Note 361
    Mark Gurries
    Power over Ethernet (PoE) is a new development that allows for the delivery of power to Ethernet-based devices
    via standard Ethernet CAT5 cable, precluding the need
    for wall adapters or other external power sources. The
    PoE specification defines a hardware detection protocol
    where Power Sourcing Equipment (PSE) is able to identify
    PoE Powered Devices (PDs), thus allowing full backwards
    compatibility with non-PoE-aware (legacy) Ethernet devices. The PoE specification also sets an upper limit
    on the power that can be drawn by a PD. The problem
    is: what happens when a PD must draw more power
    than allowed by the PoE standard? Examples may be
    the spin up of a disk drive or a period of sustained
    transmission of data from an RF transmitter. If the
    average power load of these applications is less than
    L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
    and PowerPath is a trademark of Linear Technology Corporation. All other
    trademarks are the property of their respective owners. L1
    1ОјF ...


  • Download » Articles - LT Journal PDF, 157 Kb, File published: May 1, 2004
    USB Power Controller/Charger Reduces Both Design Time and Battery Charge Time
    Docket ↓
    DESIGN FEATURES USB Power Controller/Charger
    Reduces Both Design Time
    by Roger Zemke
    and Battery Charge Time
    Introduction 3.85V
    370mA Li-ION
    CLPROG 100k GND 100k Figure 1. Standalone USB Li-Ion battery charger with PowerPath control from input to output and
    battery to output—configured for 500mA USB current limit and 500mA maximum charge current. dead. The same reasoning applies for
    fully charged batteries. A fully charged
    battery, which is not in the power path
    until the USB or external power is removed, stays fully charged. Figure 1
    shows just how simple the PowerPath
    control and battery charging in a USB
    application can be implemented using
    the LTC4055. PowerPath
    Let’s examine how PowerPath control
    reduces charge time. Assume the application load is a DC/DC converter.
    Such converters are effectively constant power devices. The higher the
    input voltage to the DC/DC converter
    the lower the current draw. In a USB
    application where the current is
    500mA 0.2Ω 4.98V 400mA 100mA 130mA limited, it makes sense to run the ...

Moldel Line

Series: LTC4055-1 (2)

Manufacturer's Classification

  • Power Management > PMIC & Multifunction > USB Power Manager (PowerPath, Battery Charger)

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