Datasheet Linear Technology LTC4055-1 USB Power Controller and Li-Ion Linear Charger Datasheets- Download » Datasheet PDF, 304 Kb, Revision: B, File uploaded: Oct 22, 2017
LTC4055/LTC4055-1 - USB Power Controller and Li-Ion Linear Charger
Docket ↓LTC4055/LTC4055-1
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 ...
PricesPackagingParametrics | LTC4055EUF-1#PBF | LTC4055EUF-1#TRPBF |
|---|
| Battery Chemistry | Li-Ion, Li-Polymer | Li-Ion, Li-Polymer |
|---|
| Demo Boards | DC676A | DC676A |
|---|
| Export Control | no | no |
|---|
| Features | Dual Input, PowerPath | Dual Input, PowerPath |
|---|
| Float Voltage, V | 4.1V, 4.2V | 4.1V, 4.2V |
|---|
| Max Charge Current, A | 1.25 | 1.25 |
|---|
| Number of Cells | 1 | 1 |
|---|
| Number of Outputs | 1 | 1 |
|---|
| Operating Temperature Range, °C | 0 to 85 | 0 to 85 |
|---|
| PowerPath | Linear PowerPath, 200mΩ Internal Ideal Diode | Linear PowerPath, 200mΩ Internal Ideal Diode |
|---|
| Type of Charger | Linear | Linear |
|---|
| Vin Max, V | 5.5 | 5.5 |
|---|
| Vin Min, V | 4.3 | 4.3 |
|---|
Eco PlanOther OptionsLTC4055 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
Introduction
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
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Articles- 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
AT 3.85V 1Ω IN1 OUT IN2 BAT VNTC 10µF NTC SUSPEND USB POWER SUSP 500mA/100mA SELECT HPWR
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 LineSeries: LTC4055-1 (2) Manufacturer's Classification- Power Management > PMIC & Multifunction > USB Power Manager (PowerPath, Battery Charger)
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