Datasheet Linear Technology LTC3557

Manufacturer	Linear Technology
Series	LTC3557

USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

Datasheets

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PDF, 326 Kb, Revision: C, File uploaded: Oct 22, 2017

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Packaging

	LTC3557EUF#PBF	LTC3557EUF#TRPBF
N	1	2
Package	4x4 QFN-28 Package Outline Drawing	4x4 QFN-28 Package Outline Drawing
Package Code	UF	UF
Package Index	05-08-1721	05-08-1721
Pin Count	28	28

Parametrics

Parameters / Models	LTC3557EUF#PBF	LTC3557EUF#TRPBF
Battery Chemistry	Li-Ion, Li-Polymer	Li-Ion, Li-Polymer
Buck Output Current, A	0.4, 0.4, 0.6	0.4, 0.4, 0.6
Demo Boards	DC1138A-A,DC1138A-B,DC1142A-A,DC1142A-B	DC1138A-A,DC1138A-B,DC1142A-A,DC1142A-B
Export Control	no	no
Features	Battery Charger, Bat-Track, PowerPath, Triple Buck, LDO, Burst Mode	Battery Charger, Bat-Track, PowerPath, Triple Buck, LDO, Burst Mode
Float Voltage, V	4.2V	4.2V
LDO Output Current, A	0.025	0.025
Max Charge Current, A	1.5	1.5
Number of Cells	1	1
Number of Outputs	4	4
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	2.7	2.7

Eco Plan

	LTC3557EUF#PBF	LTC3557EUF#TRPBF
RoHS	Compliant	Compliant

Other Options

LTC3557-1

Articles

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Highly Integrated USB Power Manager with Li-Ion Charger and Three Step-Down Switching Regulators in 4mm x 4mm QFN &mdash LT Journal
PDF, 244 Kb, File published: Jun 14, 2007
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DESIGN FEATURESвЂ‰L Highly Integrated USB Power Manager
with Li-Ion Charger and Three
Step-Down Switching Regulators
in 4mm Г— 4mm QFN
by Amit Lele
Introduction
Mobile technology has radically
changed the way we acquire, share
and disseminate information. Modern,
feature-rich handheld and portable
devices require several power management circuits, including a battery
charger, multiple step-down switching
regulators and low power LDOs for
watchdog circuitry. If each of these
functions is served by a separate power
supply IC, each IC (and its external
components) occupies valuable board
space, consumes battery-draining
quiescent current and significantly
increases the overall development and material costs of the device. The
LTC3557 solves this problem by bringing all power management functions
into a single device. It combines a full
featured USB power manager, a Li-ion …
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New Family of Integrated Power Controllers Combine Fast Battery Charging, PowerPath Control and Efficient DC/DC Converters in Less Than 20mm2 &mdash LT Journal
PDF, 303 Kb, File published: Sep 23, 2008
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LвЂ‰DESIGN FEATURES New Family of Integrated Power
Controllers Combine Fast Battery
Charging, PowerPath Control and
Efficient DC/DC Converters in
by Sam Nork
Less Than 20mm2
Introduction
The quickest way to build an efficient
power system for a battery-powered
portable application is to use an
IC that combines all power control
functions into a single chip, namely a
Power Management Integrated Circuit
(PMIC). PMICs seamlessly manage
power flow from various power sources
(wall adapters, USB and batteries) to
power loads (device systems and the
charging battery), while maintaining
current limits where required (such
as that specified for USB). To this
end, PMICs typically feature built-in
PowerPathв„ў control, DC/DC conver-USB/WALL
4.35V TO 5.5V TO OTHER …

Model Line

Series: LTC3557 (2)

LTC3557EUF#PBF LTC3557EUF#TRPBF

Manufacturer's Classification

Power Management > PMIC & Multifunction > PMIC (DC/DC, PowerPath and Battery Charger)