LTC4098/LTC4098-1 USB Compatible Switching Power Managers/Li-Ion Chargers with Overvoltage Protection FEATURES DESCRIPTION n Switching Regulator with Bat-Track Adaptive The LTC 4098/LTC4098-1 are high efficiency USB Power- Output Control Makes Optimal Use of Limited Path controllers and full-featured Li-Ion/Polymer battery Power Available from USB Port to Charge Battery chargers. They seamlessly manage power distribution from and Power Application multiple sources including USB, wall adapter, automotive, n Overvoltage Protection Guards Against Damage Firewire or other high voltage DC/DC converters, and a n Bat-Track External Step-Down Switching Regulator Li-Ion/Polymer battery. Control Maximizes Efficiency from Automotive, The LTC4098/LTC4098-1s internal switching regulator Firewire and Other High Voltage Input Sources automatically limits its input current for USB compatibility. n 180m Internal Ideal Diode Plus External Ideal Diode For automotive and other high voltage applications, the Controller Seamlessly Provide Low Loss PowerPath LTC4098/LTC4098-1 interface with a Linear Technology when Input Power is Limited or Unavailable external switching regulator to provide a high efficiency n Preset 4.2V Charge Voltage with 0.5% Accuracy high voltage power path. Both the USB and the optional (4.1V for LTC4098-1) high voltage inputs feature Bat-Track optimized charging n 4.1V Float Voltage (LTC4098-1) Improves Battery Life to provide maximum power to the application and ease and High Temperature Safety Margin thermal issues in high power density applications with n Instant-On Operation with Discharged Battery input supplies from 5V to as high as 38V. n 700mA Maximum Load Current from USB Port n An overvoltage circuit protects the LTC4098/LTC4098-1 1.5A Maximum Charge Current with Thermal Limiting n from high voltage damage on the USB/wall adaptor inputs 20-Lead 3mm 4mm 0.75mm QFN Package with an N-channel FET and a resistor. APPLICATIONS The LTC4098/LTC4098-1 are available in a 20-lead, 3mm n Media Players 4mm 0.75mm QFN surface mount package. n GPS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Bat-Track and PowerPath are trademarks of Linear Technology Corporation. n PDAs All other trademarks are the property of their respective owners. n Smart Phones TYPICAL APPLICATION USB Switching Regulator Efficiency High Efficiency USB/Automotive Battery Charger with Overvoltage Protection to System Load (P /P ) VOUT VBUS INPUT 100 AUTOMOTIVE, LT3653 FIREWIRE, ETC. 90 3.3H SYSTEM 80 LOAD INPUT BAT = 4.2V 70 V V WALL SW BUS C USB 10F 60 BAT = 3.3V 50 V OVGATE OUT LTC4098/LTC4098-1 6.04k 40 OVSENS 3 30 TO C D0-D2 BAT 20 CLPROG PROG GND BATSENS V = 5V 10F BUS I = 0mA 10 BAT 10x MODE 0 + 0.1F 3.01k 1k Li-Ion 0.01 0.1 1 40981 TA01a I (A) VOUT 40981 TA01b 40981fc 1 EFFICIENCY (%)LTC4098/LTC4098-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V , WALL (Transient) t < 1ms, TOP VIEW BUS Duty Cycle < 1% .......................................... 0.3V to 7V V , WALL (Static), BAT, BATSENS, BUS 20 19 18 17 CHRG, NTC, ................................................. 0.3V to 6V OVSENS 1 16 D1 D0, D1, D2.........0.3V to Max (V , V , BAT) + 0.3V OVGATE 2 15 D0 BUS OUT CLPROG 3 14 SW I ................................................................ 10mA OVSENS 21 NTCBIAS 4 13 V BUS I ....................................................................3mA CLPROG NTC 5 12 V OUT I ........................................................................2mA BATSENS 6 11 BAT PROG I ......................................................................50m A 7 8 9 10 CHRG I , I , I ............................................................2A VOUT SW BAT I ......................................................................10mA ACPR UDC PACKAGE 20-LEAD (3mm s 4mm) PLASTIC QFN Operating Temperature Range (Note 2) ...40C to 85C T = 125C, = 43C/W JMAX JA Junction Temperature ........................................... 125C EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 125C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4098EPDC PBF LTC4098EPDC TRPBF DDVT 40C to 85C (OBSOLETE) 20-Lead (3mm 4mm) Plastic UTQFN LTC4098EUDC PBF LTC4098EUDC TRPBF LDDT 40C to 85C 20-Lead (3mm 4mm) Plastic QFN LTC4098EPDC-1 PBF LTC4098EPDC-1 TRPBF DSZT 20-Lead (3mm 4mm) Plastic UTQFN 40C to 85C (OBSOLETE) LTC4098EUDC-1 PBF LTC4098EUDC-1 TRPBF LFXX 20-Lead (3mm 4mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: