LTC3550

PRODUCTION

Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

Part Models: 2
1ku List Price: Starting From $2.90

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Overview

Charges Single-Cell Li-Ion Battery from Wall Adapter and USB Inputs
Automatic Input Power Detection and Selection
Charge Current Programmable Up to 950mA from Wall Adapter Input
Adjustable Output, High Efﬁciency 600mA Synchronous DC/DC Converter
No External MOSFET, Sense Resistor or Blocking Diode Needed
Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*

Preset Charge Voltage with ±0.6% Accuracy
Programmable Charge Current Termination
1.5MHz Constant Frequency Operation (Step-Down Converter)
18μA USB Suspend Current in Shutdown
“Power Present” Status Output
Charge Status Output
Automatic Recharge
Available in a Thermally Enhanced, Low Proﬁle (0.75mm) 16-Lead (5mm × 3mm) DFN Package

The LTC3550 is a standalone linear charger with a 600mA monolithic synchronous buck converter. It is capable of charging a single-cell Li-Ion battery from both wall adapter and USB inputs. The charger automatically selects the appropriate power source for charging.

Internal thermal feedback regulates the battery charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The ﬂoat voltage is ﬁxed at 4.2V and the charge currents are programmed with external resistors. The LTC3550 terminates the charge cycle when the charge current drops below the programmed termination threshold after the ﬁnal ﬂoat voltage is reached. With power applied to both inputs, the LTC3550 can be put into shutdown mode reducing the DCIN supply current to 20μA, the USBIN supply current to 10μA, and the battery drain current to less than 2μA.

The DC/DC converter switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors.


	Vout
LTC3550	Adjustable
LTC3550-1	1.875V

Applications

Cellular Telephones

Part Models: 2
1ku List Price: Starting From $2.90

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
LTC3550EDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3550EDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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
Battery Monitors & Fuel Gauges 1
LTC2942	NOT RECOMMENDED FOR NEW DESIGNS	Battery Gas Gauge with Temperature, Voltage Measurement

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3550
LTC3550-1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.