LTC3557
LTC3557-1

PRODUCTION

USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

Part Models: 4
1ku List Price: Starting From $5.19

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Overview

Seamless Transition Between Input Power Sources: Li-Ion Battery, USB, 5V Wall Adapter or High Voltage Buck Regulator with Bat-Track^™
200mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss Power Path When Input Current is Limited or Unavailable
Triple Adjustable High Efficiency Step-Down Switching Regulators (600mA, 400mA, 400mA I_OUT)
Pin Selectable Burst Mode^® Operation
Full Featured Li-Ion/Polymer Battery Charger
1.5A Maximum Charge Current with Thermal Limiting
Battery Float Voltage:
- 4.2V (LTC3557)
- 4.1V (LTC3557-1)
Low Profile 4mm x 4mm 28-Pin QFN Package

The LTC3557/LTC3557-1 is a highly integrated power management and battery charger IC for single cell Li-Ion/Polymer battery applications. It includes a PowerPath^™ manager with automatic load prioritization, a battery charger, an ideal diode and numerous internal protection features. Designed specifically for USB applications, the LTC3557/LTC3557-1 power manager automatically limits input current to a maximum of either 100mA or 500mA for USB applications or 1A for wall adapter powered applications. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit. The LTC3557/LTC3557-1 also includes three adjustable synchronous step-down switching regulators and a high voltage buck regulator output controller with Bat-Track that allows efficient charging from supplies as high as 38V. The LTC3557/LTC3557-1 is available in a low profile 4mm × 4mm × 0.75mm 28-pin QFN package.

Applications

HDD-Based MP3 Players
PDA, PMP, PND/GPS
USB-Based Handheld Products

Part Models: 4
1ku List Price: Starting From $5.19

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
LTC3557EUF#PBF	28-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3557EUF#TRPBF	28-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3557EUF-1#PBF	28-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3557EUF-1#TRPBF	28-Lead QFN (4mm x 4mm x 0.75mm 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
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Protection Switches & Controllers 2
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On
LTC4361-1 LTC4361-2		Overvoltage/Overcurrent Protection Controller

Evaluation Kits

LT3557EUF-1/LT3505EDD Demo Board | PMIC Plus HV Buck, USB Power Manager with 0.5A Li-Ion Charger and Three Bucks Plus HV Buck Controller

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Product Details

The DC1138A-B contains the LTC3557-1 Power Management Integrated Circuit (PMIC) plus the LT3505EDD 36V (40V transients) buck regulator. The LTC3557-1 (4.1V charge voltage) includes a PowerPath controller, a 1.5A battery charger (configured for 500mA), an ideal diode, an always-on LDO, three synchronous step-down switching regulators (600mA and 2 × 400mA ), as well as a buck regulator VC controller.

Designed specifically for USB applications, the PowerPath controller incorporates a precision input current limit which communicates with the battery charger to ensure that the input current does not violate the USB specification. The ideal diode from BAT to V_OUT guarantees that ample power is always available to V_OUT even if there is insufficient or absent power at VBUS. The LTC3557-1 also has the ability to receive power from a wall adapter or other non-current- limited power source.

Resources

DC1138A - Schematic
9/24/2009

DC1138A - Design File
9/24/2009

DC1138A - Demo Manual
9/24/2009

LTC3557EUF/LT3505EDD Demo Board | PMIC Plus HV Buck, USB Power Manager with 0.5A Li-Ion Charger and Three Bucks Plus HV Buck Controller

Buy Now View Details

Product Details

The DC1138A-A contains the LTC3557 Power Management Integrated Circuit (PMIC) plus the LT3505EDD 36V (40V transients) buck regulator. The LTC3557 (4.2V charge voltage) includes a PowerPath controller, a 1.5A battery charger (configured for 500mA), an ideal diode, an always-on LDO, three synchronous step-down switching regulators (600mA and 2 × 400mA ), as well as a buck regulator VC controller.

Designed specifically for USB applications, the PowerPath controller incorporates a precision input current limit which communicates with the battery charger to ensure that the input current does not violate the USB specification. The ideal diode from BAT to V_OUT guarantees that ample power is always available to V_OUT even if there is insufficient or absent power at VBUS. The LTC3557 also has the ability to receive power from a wall adapter or other non-current-limited power source.