LTC3556

PRODUCTION

High Efﬁciency USB Power Manager with Dual Buck and Buck-Boost DC/DCs

Data Sheet (Rev. B) Product Selection Table

Part Models: 2
1ku List Price: Starting From $6.29

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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
Instant-On Operation with a Discharged Battery
1.5A Maximum Charge Current
Internal 180mΩ Ideal Diode Plus External Ideal Diode Controller Powers Load in Battery Mode
Low No-Load IQ when Powered from BAT (<30µA)

DC/DCs

Dual High Efficiency Buck DC/DCs (400mA/400mA I_OUT
High Efficiency Buck-Boost DC/DC (1A I_OUT)
All Regulators Operate at 2.25MHz
Dynamic Voltage Scaling on Two Buck Outputs
I²C Control of Enables, Mode, Two V_OUT Settings
ENALL Pin with Power-Up Sequence Control
Low No-Load Quiescent Current: 20µA Each

The LTC3556 is a highly integrated power management and battery charger IC for Li-Ion/Polymer battery applications. It includes a high efficiency current limited switching PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, and three synchronous switching regulators (two bucks and one buck-boost). Designed specifically for USB applications, the LTC3556’s switching power manager automatically limits input current to a maximum of either 100mA or 500mA for USB applications or 1A for adapter-powered applications

The LTC3556’s switching input stage transmits nearly all of the 2.5W available from the USB port to the system load with minimal power wasted as heat. This feature allows the LTC3556 to provide more power to the application and eases the constraint of thermal budgeting in small spaces. The two buck regulators can provide up to 400mA each and the buck-boost can deliver 1A..

The LTC3556 is available in the low profile 28-pin (4mm × 5mm × 0.75mm) QFN surface mount package.

Applications

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

Part Models: 2
1ku List Price: Starting From $6.29

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
LTC3556EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3556EUFD#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
LTC3556EUFD#PBF	PRODUCTION
LTC3556EUFD#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
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal 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
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On
LTC4362-1 LTC4362-2		1.2A Overvoltage/Overcurrent Protector

Evaluation Kits

Evaluation Board for the AD5676R WLCSP

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Features and Benefits

Full featured evaluation board for the AD5676R WLCSP
On-board or external power supply
On-board or external voltage reference
Arduino^® Uno form-factor, mates with SDP-K1
PC control via Analysis | Control | Evaluation (ACE) Software

Product Details

The EVAL-AD5676RARDZ allows users to quickly prototype AD5676R circuits and reduce design time. The AD5676R operates from a single 2.7 V to 5.5 V supply. The AD5676R incorporates an internal 2.5 V reference to give a full-scale output voltage of 2.5 V or 5 V. An ADR4525 is also provided on-board as a 2.5V reference source. A different external reference voltage can be applied via the EXT_REF SMB connector or test pin if needed.

The EVAL-AD5676RARDZ interfaces to the USB port of a PC via a system demonstration platform board (SDP-K1 ). The Analysis | Control | Evaluation (ACE) software is available for download from the EVAL-AD5676RARDZ product page to use with the evaluation board to allow the user to program the AD5676R. A peripheral module interface (PMOD) connection is also available to allow the connection of microcontrollers to the evaluation board without the SDP-K1 board. When a microcontroller is used through the PMOD connection, the SDP-K1 board must be disconnected, and the user is unable to operate the ACE software.

The EVAL-AD5676RARDZ is compatible with the EVAL-SDP-CK1Z (SDP-K1), which should be purchased separately. A typical connection between the EVAL-AD5676RARDZ and the SDP-B controller board is shown in the user guide. For full details, see the AD5676R data sheet, which must be used in conjunction with the user guide when using the EVAL-AD5676RARDZ.