LTC3576
LTC3576-1

PRODUCTION

Switching Power Manager with USB On-the-Go + Triple Step-Down DC/DCs

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Overview

  • Bidirectional Switching Regulator with Bat-Track™ Adaptive Output Control Provides Efficient Charging and a 5V Output for USB On-The-Go
  • Bat-Track Control of External High Voltage Step-Down Switching Regulator
  • Overvoltage Protection Guards Against Damage
  • Instant-On Operation with Discharged Battery
  • Triple Step-Down Switching Regulators with I2C Adjustable Outputs (1A/400mA/400mA IOUT)
  • 180mΩ Internal Ideal Diode + External Ideal Diode Controller Powers the Load in Battery Mode
  • Li-Ion/Polymer Battery Charger (1.5A Max ICHG)
  • Battery Float Voltage: 4.2V (LTC3576), 4.1V (LTC3576-1)
  • Compact (4mm × 6mm × 0.75mm) 38-pin QFN Package

The LTC3576/LTC3576-1 are highly integrated power management and battery charger ICs for Li-Ion/Polymer battery applications. They each include a high efficiency, bidirectional switching PowerPath™ manager with automatic load prioritization, a battery charger, an ideal diode, a controller for an external high voltage switching regulator and three general purpose step-down switching regulators with I2C adjustable output voltages. The internal switching regulators automatically limit input current for USB compatibility and can also generate 5V at 500mA for USB on-the-go applications when powered from the battery. Both the USB and external switching regulator power paths feature Bat-Track optimized charging to provide maximum power to the application from supplies as high as 38V. An overvoltage circuit protects the LTC3576/LTC3576-1 from damage due to high voltage on the VBUS or WALL pins with just two external components. The LTC3576/LTC3576-1 are available in a low profile 38-pin (4mm × 6mm × 0.75mm) QFN package.

Applications

  • HDD-Based Media Players
  • GPS, PDAs, Digital Cameras, Smart Phones
  • Automotive Compatible Portable Electronics
LTC3576
LTC3576-1
Switching Power Manager with USB On-the-Go + Triple Step-Down DC/DCs
High Effi ciency PowerPath Manager with Overvoltage Protection and Triple Step-Down Regulator PowerPath Switching Regulator Efficiency to System Load (PVOUT/PVBUS Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 2

Data Sheet

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

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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
Protection Switches & Controllers 2
LTC4361-1
LTC4361-2
Overvoltage/Overcurrent Protection Controller
LTC2955
RECOMMENDED FOR NEW DESIGNS Pushbutton On/Off Controller with Automatic Turn-On
Temperature Sensors 1
LTC2991
RECOMMENDED FOR NEW DESIGNS Octal I2C Voltage, Current, and Temperature Monitor
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Evaluation Kits

eval board
schematic 1
DC1577A

LTC3576EUFE-1 Demo Board | Switching Power Manager with USB On-the-Go, Triple Step-Down DC/DC (1A, 0.4A, 0.4A)

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Product Details

Demonstration Circuit DC1577A is a switching power manager that features a high-efficiency bidirectional PowerPath switching regulator for USB On-the-Go, a controller for an external high voltage step-down switching regulator, a 1A battery charger (4.1V VFLOAT), an ideal diode, an always-on LDO, an overvoltage protection circuit and three general purpose synchronous step-down switching regulators. The three DC/DC converters provide 1.9V to 3.6V @ 400mA, 1.8V to 3.4V @ 400mA and 1V to 1.8V @ 1A.


The DC1577A Demo Circuit can be controlled from a software GUI. Most of the features of the LTC3576EUFE-1 are only accessible via its I2C port.

eval board
schematic 2
DC1334A

LTC3576EUFE Demo Board | Switching Power Manager with USB On-the-Go, Triple Step-Down DC/DC (1A, 0.4A, 0.4A)

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Product Details

Demonstration Circuit DC1334A is a switching power manager that features a high-efficiency bidirectional PowerPath switching regulator for USB On-the-Go, a controller for an external high voltage step-down switching regulator, a 1A battery charger (4.2V VFLOAT), an ideal diode, an always-on LDO, an overvoltage protection circuit and three general purpose synchronous step-down switching regulators. The three DC/DC converters provide 1.9V to 3.6V @ 400mA, 1.8V to 3.4V @ 400mA and 1V to 1.8V @ 1A.


The DC1334A Demo Circuit can be controlled from a software GUI. Most of the features of the LTC3576EUFE are only accessible via its I2C port.
DC1577A
LTC3576EUFE-1 Demo Board | Switching Power Manager with USB On-the-Go, Triple Step-Down DC/DC (1A, 0.4A, 0.4A)
DC1577A - Schematic
DC1334A
LTC3576EUFE Demo Board | Switching Power Manager with USB On-the-Go, Triple Step-Down DC/DC (1A, 0.4A, 0.4A)
DC1334A - Schematic

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