LTC3577EUFF-1#PBF Analog Devices

LTC3577/LTC3577-1 Highly Integrated 6-Channel Portable PMIC FEATURES DESCRIPTION n Full Featured Li-Ion/Polymer Charger/PowerPath The LTC 3577 is a highly integrated power management Controller with Instant-On Operation IC for single cell Li-Ion/Polymer battery applications. It n Triple Adjustable High Ef ciency Step-Down includes a PowerPath manager with automatic load priori- Switching Regulators (800mA, 500mA, 500mA I ) tization, a battery charger, an ideal diode, input overvoltage OUT n 6A Battery Drain Current in Hard Reset protection and numerous other internal protection features. n Bat-Track Control for External HV Buck DC/DCs The LTC3577 is designed to accurately charge from current 2 n I C Adjustable SW Slew Rates for EMI Reduction limited supplies such as USB by automatically reducing n High Temperature Battery Voltage Reduction charge current such that the sum of the load current and Improves Safety and Reliability the charge current does not exceed the programmed input n Overvoltage Protection for USB (V )/Wall Inputs current limit (100mA or 500mA modes). The LTC3577 BUS Provides Protection to 30V reduces the battery voltage at elevated temperatures to n Integrated 40V Series LED Backlight Driver with 60dB improve safety and reliability. Ef cient high current charg- 2 Brightness Control and Gradation via I C ing from supplies up to 38V is available using the on-chip n 1.5A Maximum Charge Current with Thermal Limiting Bat-Track controller. The LTC3577 also includes a push- n Battery Float Voltage: 4.2V (LTC3577) button input to control the three synchronous step-down 4.1V (LTC3577-1) switching regulators and system reset. The onboard LED n Pushbutton On/Off Control with System Reset backlight boost circuitry can drive up to 10 series LEDs 2 n Dual 150mA Current Limited LDOs and includes versatile digital dimming via I C input. The 2 n Small 4mm 7mm 44-Pin QFN Package I C input also controls two 150mA LDOs as well as other operating modes and status read back. The LTC3577 is available in a low pro le 4mm 7mm 0.75mm 44-pin APPLICATIONS QFN package. n PNDs, DMB/DVB-H; Digital/Satellite Radio; L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Media Players PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6522118, n Portable Industrial/Medical Products 6700364, 7511390, 5481178, 6580258. Other Patents Pending. n Universal Remotes, Photo Viewers n Other USB-Based Handheld Products TYPICAL APPLICATION HV SUPPLY HIGH VOLTAGE 8V TO 38V BUCK DC/DC LED Driver Ef ciency (10 LEDs) (TRANSIENTS TO 60V) OPTIONAL 90 100mA/500mA 80 1000mA USB 70 V OUT 0V OVERVOLTAGE 60 CC/CV MAX PWM CONSTANT PROTECTION 50 CURRENT CHARGER + SINGLE CELL NTC Li-Ion 40 LTC3577/LTC3577-1 CHARGE 2 0.8V to 3.6V/150mA 30 DUAL LDO 2 I C PORT REGULATORS 0.8V to 3.6V/150mA 20 LED BACKLIGHT WITH DIGITALLY UP TO 10 LED CONTROLLED DIMMING BOOST 10 TRIPLE HIGH EFFICIENCY 0.8V to 3.6V/800mA 0 STEP-DOWN SWITCHING 1.E-06 1.E-05 1.E-04 1.E-03 1.E-02 1.E-01 0.8V to 3.6V/500mA PB REGULATORS WITH LED CURRENT (A) 0.8V to 3.6V/500mA PUSHBUTTON CONTROL 3577 TA01a 3577 TA01b 3577fa 1 EFFICIENCY (%)LTC3577/LTC3577-1 TABLE OF CONTENTS Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Order Information ................................................................................................................. 3 Pin Con guration ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics .........................................................................................10 Pin Functions .....................................................................................................................16 Block Diagram ....................................................................................................................19 PowerPath Operation ............................................................................................................................................ 20 Low Dropout Linear Regulator Operation ............................................................................................................. 30 Step-Down Switching Regulator Operation ........................................................................................................... 31 LED Backlight/Boost Operation ............................................................................................................................. 35 2 I C Operation ........................................................................................................................................................ 38 Pushbutton Interface Operation ............................................................................................................................ 43 Layout and Thermal Considerations ..................................................................................................................... 48 Typical Applications .............................................................................................................50 Package Description ............................................................................................................52 Related Parts .....................................................................................................................53 Revision History .................................................................................................................54 3577fa 2