LTC3552

PRODUCTION

Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter

Part Models: 2
1ku List Price: Starting From $3.06

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Part Details

Programmable Charge Current Up to 950mA
Complete Linear Charger and Dual DC/DC Regulator
Buck Converter Output Voltage from 0.6V to 5V
No MOSFET, Sense Resistor or Blocking Diode Required
Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
Charges Directly from a USB Port
Programmable Charge Current Termination
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging*
Automatic Recharge
Charge Status Output
“Power Present” Output
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Low Quiescent Current Buck Converter (40µA)
Current Mode Operation, Constant Frequency (2.25MHz)
Low Proﬁle (5mm × 3mm × 0.75mm) DFN Package

The LTC3552 is a complete constant-current/constantvoltage linear charger with a dual DC/DC converter for single cell lithium-ion batteries. Its DFN package and low external component count make the LTC3552 ideally suited for portable applications. Furthermore, the LTC3552 is designed to work within USB power speciﬁ cations.

No external sense resistor or external blocking diode is required due to the internal MOSFET architecture. The charge voltage is ﬁxed at 4.2V and the charge current is programmed with a resistor. The charge cycle terminates when the charge current drops below the programmed termination threshold after the ﬁnal ﬂoat voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LTC3552 enters a low current state dropping the battery drain current to less than 2µA. Thermal regulation maximizes charge rate without risk of overheating.

The synchronous step-down switching regulators generate adjustable output voltages from 5V down to 0.6V. The switching frequency is set at 2.25MHz, allowing the use of small surface mount inductors and capacitors.


	Vout
LTC3552	Adjustable (0.6V to 5V)
LTC3552-1	1.8V & 1.575V

Applications

Cellular Telephones, PDAs, MP3 Players
Bluetooth Applications

Part Models: 2
1ku List Price: Starting From $3.06

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
LTC3552EDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3552EDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Tools & Simulations

LTspice 1

LTC3552 - Battery Management

Models for the following parts are available in LTspice:

LTC3552
LTC3552-1

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.