LTC3558

PRODUCTION

Linear USB Battery Charger with Buck and Buck-Boost Regulators

Data Sheet Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.19

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Overview

Battery Charger

Standalone USB Charger
Up to 950mA Charge Current Programmable via Single Resistor
HPWR Input Selects 20% or 100% of Programmed Charge Current
NTC Input for Temperature Qualiﬁed Charging
Internal Timer Termination
Bad Battery Detection

Switching Regulators (Buck and Buck-Boost)

Up to 400mA Output Current per Regulator
2.25MHz Constant-Frequency Operation
Power Saving Burst Mode^® Operation
Low Proﬁle, 20-Lead, 3mm × 3mm QFN Package

The LTC3558 is a USB battery charger with dual high efﬁciency switching regulators. The device is ideally suited to power single-cell Li-Ion/Polymer based handheld applications needing multiple supply rails.

Battery charge current is programmed via the PROG pin and the HPWR pin with capability up to 950mA of current at the BAT pin. The CHRG pin allows battery status to be monitored continuously during the charging process. An internal timer controls charger termination.

The part includes monolithic synchronous buck and buck-boost regulators that can provide up to 400mA of output current each and operate at efficiencies greater than 90% over the entire Li-Ion/Polymer battery range. The buck-boost regulator can regulate its programmed output voltage at its rated deliverable current over the entire Li-Ion range without drop out, increasing battery runtime.

The LTC3558 is offered in a low proﬁle (0.75mm), thermally enhanced, 20-lead (3mm × 3mm) QFN package.

Applications

SD/Flash-Based MP3 Players
Low Power Handheld Applications

Part Models: 2
1ku List Price: Starting From $3.19

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
LTC3558EUD#PBF	20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3558EUD#TRPBF	20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3558EUD#PBF	PRODUCTION
LTC3558EUD#TRPBF	PRODUCTION