LTC3577-3
LTC3577-4

PRODUCTION

Highly Integrated Portable Product PMIC

Part Models: 4
1ku List Price: Starting From $5.90

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Overview

Full Featured Li-Ion/Polymer Charger/PowerPath^™ Controller with Instant-On Operation
Triple Adjustable High Efficiency Step-Down Switching Regulators (800mA, 500mA, 500mA I_OUT)
I²C Adjustable SW Slew Rates for EMI Reduction
High Temperature Battery Voltage Reduction Improves Safety and Reliability
Overvoltage Protection Controller for USB (V_BUS)/Wall Inputs Provide Protection to 30V
Integrated 40V Series LED Back Light Driver with 60dB Brightness Control and Gradation via I²C
1.5A Maximum Charge Current with Thermal Limiting
Battery Float Voltage:
- 4.2V (LTC3577-3)
- 4.1V (LTC3577-4)
Pushbutton ON/OFF Control with System Reset
Dual 150mA Current Limited LDOs
Start-Up Timing Compatible with SiRF Atlas IV Processor
Small 4mm × 7mm 44-Pin QFN Package

The LTC3577-3/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 overvoltage 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 load current and the charge current does not exceed the programmed input current limit (100mA or 500mA modes). The LTC3577-3/LTC3577-4 reduce the battery voltage at elevated temperatures to improve safety and reliability. The three step-down switching regulators and two LDOs provide a wide range of available supplies. The LTC3577-3/LTC3577-4 also include a pushbutton input to control power sequencing and system reset. The on-board LED backlight boost circuitry can drive up to 10 series LEDs and includes versatile digital dimming via the I²C input. The LTC3577-3/LTC3577-4 are designed to support the SiRF Atlas IV processor and has pushbutton timing and sequencing different from other LTC3577 versions. The LTC3577-3/LTC3577-4 are available in a low profile 4mm × 7mm × 0.75mm 44-pin QFN package.

Applications

PNDs, DMB/DVB-H, Digital/Satellite Radio, Media Players
Portable Industrial/Medical Products
Other USB-Based Handheld Products

Part Models: 4
1ku List Price: Starting From $5.90

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
LTC3577EUFF-3#PBF	44-Lead QFN (4mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3577EUFF-3#TRPBF	44-Lead QFN (4mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3577EUFF-4#PBF	44-Lead QFN (4mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3577EUFF-4#TRPBF	44-Lead QFN (4mm x 7mm 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
Analog to Digital Converters (ADCs) 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Battery Monitors & Fuel Gauges 1
LTC2942-1	Obsolete	1A Battery Gas Gauge with Internal Sense Resistor and Temperature/Voltage Measurement
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Protection Switches & Controllers 1
LTC4362-1 LTC4362-2		1.2A Overvoltage/Overcurrent Protector