Features and Benefits
- Full Featured Li-Ion/Polymer Charger/PowerPath™ Controller with Instant-On Operation
- Triple Adjustable High Efficiency Step-Down Switching Regulators (800mA, 500mA, 500mA IOUT)
- 6μA Battery Drain Current in Hard Reset
- Bat-Track™ Control for External HV Buck DC/DCs
- I2C Adjustable SW Slew Rates for EMI Reduction
- High Temperature Battery Voltage Reduction Improves Safety and Reliability
- Overvoltage Protection for USB (VBUS)/Wall Inputs
- Provides Protection to 30V
- Integrated 40V Series LED Backlight Driver with 60dB
- Brightness Control and Gradation via I2C
- 1.5A Maximum Charge Current with Thermal Limiting
- Battery Float Voltage:
- 4.2V (LTC3577)
- 4.1V (LTC3577-1)
- Pushbutton On/Off Control with System Reset
- Dual 150mA Current Limited LDOs
- Small 4mm × 7mm 44-Pin QFN Package
The LTC3577 is a highly integrated power management IC for single cell Li-Ion/Polymer battery applications. It includes a PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, input overvoltage protection and numerous other internal protection features. The LTC3577 is designed to accurately charge from current limited supplies such as USB by automatically reducing charge current such that the sum of the load current and the charge current does not exceed the programmed input current limit (100mA or 500mA modes). The LTC3577 reduces the battery voltage at elevated temperatures to improve safety and reliability. Efficient high current charging from supplies up to 38V is available using the on-chip Bat-Track controller. The LTC3577 also includes a pushbutton input to control the three synchronous step-down switching regulators and system reset. The onboard LED backlight boost circuitry can drive up to 10 series LEDs and includes versatile digital dimming via I2C input. The I2C input also controls two 150mA LDOs as well as other operating modes and status read back. The LTC3577 is available in a low profile 4mm × 7mm × 0.75mm 44-pin QFN package.
- PNDs, DMB/DVB-H; Digital/Satellite Radio;
- Media Players
- Portable Industrial/Medical Products
- Universal Remotes, Photo Viewers
- Other USB-Based Handheld Products
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Demo Circuit 1402 is a Highly Integrated 6-Channel Portable PMIC featuring the LTC3577 (DC1402A-A) and the LTC3577-1 (DC1402A-B), which include a push button controller, two 150mA LDOs, three synchronous buck converters (800mA, 500mA, 500mA), a Li-Ion battery charger, a Power-Path controller, and high voltage buck controller interface that allows the board to control a separate LTC high voltage buck converter demo board to drive an LED (included with the demo board). The LTC3577's battery charger has a 4.2V float voltage while the LTC3577-1 has a 4.1V float voltage. The board can be power with a 1.6V to 5.5V DC input supply, a USB input or a 5V wall adapter. Do not look directly at the operating LED as this circuit produces light that can damage eyes.
Demo Circuit 1402 is a Highly Integrated 6-Channel Portable PMIC featuring the LTC3577 and LTC3577-1, which include a push button controller, two 150mA LDOs, three synchronous buck converters (800mA, 500mA, 500mA), a Li-Ion battery charger, a Power-Path controller, and high voltage buck controller interface that allows the board to control a separate LTC high voltage buck converter demo board to drive an LED (included with the demo board). Do not look directly at the operating LED as this circuit produces light that can damage eyes. The board can be power with a 1.6V to 5.5V DC input supply, a USB input or a 5V wall adapter.
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.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.