Datasheet Linear Technology LTC4055

Manufacturer	Linear Technology
Series	LTC4055

USB Power Controller and Li-Ion Linear Charger

Datasheets

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PDF, 304 Kb, Revision: B, File uploaded: Oct 22, 2017

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Prices

Packaging

	LTC4055EUF#PBF	LTC4055EUF#TRPBF
N	1	2
Package	4x4 QFN-16 Package Outline Drawing	4x4 QFN-16 Package Outline Drawing
Package Code	UF	UF
Package Index	05-08-1692	05-08-1692
Pin Count	16	16

Parametrics

Parameters / Models	LTC4055EUF#PBF	LTC4055EUF#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, 200mв„¦ Internal Ideal Diode	Linear PowerPath, 200mв„¦ Internal Ideal Diode
Type of Charger	Linear	Linear
Vin Max, V	5.5	5.5
Vin Min, V	4.3	4.3

Eco Plan

	LTC4055EUF#PBF	LTC4055EUF#TRPBF
RoHS	Compliant	Compliant

Other Options

LTC4055-1

Design Notes

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Advanced Topology USB Battery Charger Optimizes Power Utilization for Faster Charging &mdash DN336
PDF, 74 Kb, File published: Apr 3, 2004
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Advanced Topology USB Battery Charger Optimizes Power
Utilization for Faster Charging вЂ“ 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 п¬‚ow between an AC adapter, USB cable
and Li-Ion battery, all while maintaining USB power
speciп¬Ѓcation 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.
Beneп¬Ѓts of the LTC4055
In order to fully appreciate the beneп¬Ѓts 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 simpliп¬Ѓed 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 sourcesвЂ”wall adapter, USB or battery. …
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Simple Battery Circuit Extends Power over Ethernet (PoE) Peak Current &mdash DN361
PDF, 82 Kb, File published: Feb 17, 2005
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Simple Battery Circuit Extends Power over Ethernet (POE)
Peak Current вЂ“ 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 speciп¬Ѓcation deп¬Ѓnes 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 speciп¬Ѓcation 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

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USB Power Controller/Charger Reduces Both Design Time and Battery Charge Time &mdash LT Journal
PDF, 157 Kb, File published: May 1, 2004
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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 1в„¦ IN1 OUT IN2 BAT VNTC 10ВµF 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 outputвЂ”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
LetвЂ™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 0.2в„¦ 4.98V 400mA 100mA 130mA limited, it makes sense to run the …

Model Line

Series: LTC4055 (2)

LTC4055EUF#PBF LTC4055EUF#TRPBF

Manufacturer's Classification

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