LTC3576/LTC3576-1 Switching Power Manager with USB On-the-Go + Triple Step-Down DC/DCs FEATURES DESCRIPTION n Bidirectional Switching Regulator with Bat-Track The LTC 3576/LTC3576-1 are highly integrated power Adaptive Output Control Provides Ef cient Charging management and battery charger ICs for Li-Ion/Polymer and a 5V Output for USB On-The-Go battery applications. They each include a high ef ciency, n Bat-Track Control of External High Voltage Step- bidirectional switching PowerPath manager with auto- Down Switching Regulator matic load prioritization, a battery charger, an ideal diode, a n Overvoltage Protection Guards Against Damage controller for an external high voltage switching regulator n Instant-On Operation with Discharged Battery and three general purpose step-down switching regulators 2 2 n Triple Step-Down Switching Regulators with I C with I C adjustable output voltages. The internal switch- Adjustable Outputs (1A/400mA/400mA I ) ing regulators automatically limit input current for USB OUT n 180m Internal Ideal Diode + External Ideal Diode compatibility and can also generate 5V at 500mA for USB Controller Powers the Load in Battery Mode on-the-go applications when powered from the battery. n Li-Ion/Polymer Battery Charger (1.5A Max I ) Both the USB and external switching regulator power paths CHG n Battery Float Voltage: 4.2V (LTC3576), 4.1V (LTC3576-1) feature Bat-Track optimized charging to provide maximum n Compact (4mm 6mm 0.75mm) 38-Pin QFN Package 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 V or WALL pins with BUS APPLICATIONS just two external components. The LTC3576/LTC3576-1 are n available in a low pro le 38-pin (4mm 6mm 0.75mm) HDD-Based Media Players n QFN package. GPS, PDAs, Digital Cameras, Smart Phones n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Automotive Compatible Portable Electronics Technology Corporation. Bat-Track and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6404251. TYPICAL APPLICATION High Ef ciency PowerPath Manager with Overvoltage Protection and Triple Step-Down Regulator AUTOMOTIVE LT3653 FIREWIRE, ETC. PowerPath Switching Regulator Ef ciency to System Load (P /P ) VOUT VBUS USB OR 5V AC OVERVOLTAGE EXTERNAL HIGH VOLTAGE 100 ADAPTER PROTECTION BUCK CONTROLLER 90 TO OTHER USB COMPLIANT 80 LOADS BIDIRECTIONAL BAT = 4.2V SWITCHING 70 BAT = 3.3V REGULATOR 60 CC/CV 50 0V OPTIONAL BATTERY CHARGER 40 30 CHARGE LTC3576/LTC3576-1 + Li-Ion 20 T V = 5V BUS I = 0mA 10 BAT 10x MODE 3.3V/20mA RTC/LOW ALWAYS ON LDO 0 POWER LOGIC 10 100 1000 0.8V TO 3.6V/400mA LOAD CURRENT (mA) 1 MEMORY TRIPLE 6 3576 TA01b HIGH EFFICIENCY 0.8V TO 3.6V/400mA ENABLE 2 I/O STEP-DOWN CONTROLS SWITCHING 0.8V TO 3.6V/1A 3 CORE REGULATORS RST PROCESSOR 2 2 2 I C PORT I C 3576 TA01 3576fb 1 EFFICIENCY (%)LTC3576/LTC3576-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2, 3) TOP VIEW V , WALL (Transient) t < 1ms, BUS Duty Cycle < 1% .......................................... 0.3V to 7V V , WALL (Static), BAT, V , V , V , 38 37 36 35 34 33 32 BUS IN1 IN2 IN3 CLPROG 1 31 IDGATE V , ENOTG, NTC, SDA, SCL, DV , OUT CC LDO3V3 2 30 CHRG RST3, CHRG ................................................ 0.3V to 6V NTCBIAS 3 29 PROG I , I ........ 0.3V to Max(V , V , BAT) + 0.3V LIM0 ILIM1 BUS OUT NTC 4 28 ACPR EN1, EN2, EN3 .............................. 0.3V to V + 0.3V OUT OVGATE 5 27 WALL FBx (x = 1, 2, 3) ..............................0.3V to V + 0.3V INx OVSENS V 6 26 C 39 I ................................................................... 10mA OVSENS FB1 7 25 FB2 I ....................................................................3mA V 8 24 V CLPROG IN1 IN2 SW1 9 23 SW2 I , I ............................................................50mA CHRG RST3 EN1 10 22 EN2 I ........................................................................2mA PROG ENOTG 11 21 RST3 I ...................................................................30mA LDO3V3 20 DV 12 FB3 CC I , I (Continuous) .......................................600mA SW1 SW2 13 14 15 16 17 18 19 I , I , I , I (Continuous) .............................. 2A SW SW3 BAT VOUT Maximum Junction Temperature........................... 125C UFE PACKAGE Operating Temperature Range..................40C to 85C 38-LEAD (4mm 6mm) PLASTIC QFNs T = 125C, = 34C/W Storage Temperature Range ...................65C to 125C JMAX JA EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3576EUFE PBF LTC3576EUFE TRPBF 3576 40C to 85C 38-Lead (4mm 6mm) Plastic QFN LTC3576EUFE-1 PBF LTC3576EUFE-1 TRPBF 35761 40C to 85C 38-Lead (4mm 6mm) Plastic QFN Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: