LTC3555
LTC3555-X

PRODUCTION

High Efficiency USB Power Manager + Triple Step-Down DC/DC

Data Sheet Product Selection Table

Part Models: 12
1ku List Price: Starting From $6.09

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Overview

Power Manager

High Efficiency Switching PowerPath^™ Controller with Bat-Track^™ Adaptive Output Control
Programmable USB or Wall Current Limit (100mA/500mA/1A)
Full Featured Li-Ion/Polymer Battery Charger
1.5A Maximum Charge Current
Internal 180mΩ Ideal Diode + External Ideal Diode Controller Powers Load in Battery Mode
Low No-Load Quiescent Current when Powered from BAT (<32µA)

DC/DCs

Triple High Efficiency Step-Down DC/DCs (1A/400mA/400mA I_OUT)
All Regulators Operate at 2.25MHz
Dynamic Voltage Scaling on Two Outputs
I²C or Independent Enable, V_OUT Controls
Low No-Load Quiescent Current: 20µA
28-Pin (4mm × 5mm × 0.75mm) QFN Package

The LTC3555 family are highly integrated USB compatible power management and battery charger ICs for Li-Ion/Polymer battery applications. They include a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode and three general purpose synchronous step-down switching regulators.

The LTC3555 family limits input current to either 100mA or 500mA for USB applications or 1A for adapter-powered applications. Unlike linear chargers, the LTC3555 family’s switching architecture transmits nearly all of the power available from the USB port to the load with minimal loss and heat which eases thermal constraints in small spaces.

Two of the three general purpose switching regulators can provide up to 400mA and the third can deliver 1A. The entire product can be controlled via I²C or simple I/O. The LTC3555-1/LTC3555-3 versions offer “instant-on” power delivery to the portable product even with a very low battery voltage. The LTC3555-3 version also has a reduced charger ﬂoat voltage of 4.100V for battery safety and longevity.

The LTC3555 family is available in the low proﬁle 28-pin (4mm × 5mm × 0.75mm) QFN surface mount package.

Applications

HDD-Based MP3 Players, PDAs, GPS, PMPs
Portable Medical Products
Handheld Instrumentation
Other USB-Based Handheld Products

Part Models: 12
1ku List Price: Starting From $6.09

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3555EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555EUFD-1#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555EUFD-1#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555EUFD-3#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555EUFD-3#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555IUFD-1#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555IUFD-1#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555IUFD-3#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3555IUFD-3#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3555EUFD#PBF	PRODUCTION
LTC3555EUFD#TRPBF	PRODUCTION
LTC3555EUFD-1#PBF	PRODUCTION
LTC3555EUFD-1#TRPBF	PRODUCTION
LTC3555EUFD-3#PBF	PRODUCTION
LTC3555EUFD-3#TRPBF	PRODUCTION
LTC3555IUFD#PBF	PRODUCTION
LTC3555IUFD#TRPBF	PRODUCTION
LTC3555IUFD-1#PBF	PRODUCTION
LTC3555IUFD-1#TRPBF	PRODUCTION
LTC3555IUFD-3#PBF	PRODUCTION
LTC3555IUFD-3#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
LTC2990	RECOMMENDED FOR NEW DESIGNS	Quad I²C Voltage, Current and Temperature Monitor
Battery Monitors & Fuel Gauges 1
LTC2942	NOT RECOMMENDED FOR NEW DESIGNS	Battery Gas Gauge with Temperature, Voltage Measurement
Protection Switches & Controllers 2
LTC4362-1 LTC4362-2		1.2A Overvoltage/Overcurrent Protector
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On