LTC3577-3/LTC3577-4
Highly Integrated Portable Product PMIC
Features
n Full Featured Li-Ion/Polymer Charger/PowerPath...
LTC3577-3/LTC3577-4
Highly Integrated Portable Product PMIC
Features
n Full Featured Li-Ion/Polymer Charger/PowerPath™
Controller with Instant-On Operation
n Triple Adjustable High Efficiency Step-Down
Switching Regulators (800mA, 500mA, 500mA IOUT) n I2C Adjustable SW Slew Rates for EMI Reduction
n High Temperature Battery
Voltage Reduction
Improves Safety and Reliability
n Over
voltage Protection Controller for USB (VBUS)/Wall Inputs Provide Protection to 30V
n Integrated 40V Series LED Back Light Driver with 60dB Brightness Control and Gradation via I2C
n 1.5A Maximum Charge Current with Thermal Limiting
n Battery Float
Voltage: 4.2V (LTC3577-3)
4.1V (LTC3577-4)
n Pushbutton ON/OFF Control with System Reset
n Dual 150mA Current Limited LDOs
n Start-Up Timing Compatible with SiRF Atlas IV
Processor
n Small 4mm × 7mm 44-Pin QFN Package
Applications
n PNDs, DMB/DVB-H, Digital/Satellite Radio, Media Players
n Portable Industrial/Medical Products n Other USB-Based Handheld Products
Description
The LTC®3577-3/LTC3577-4 are highly integrated power management ICs for single cell Li-Ion/Polymer battery applications. It includes a PowerPath manager with automatic load prioritization, a battery charger, an ideal diode, input over
voltage protection and numerous other internal protection features. The LTC3577-3/LTC3577-4 are designed to accurately charge from current limited supplies such as USB by automatically reducing charge current such that the sum of the lo...