LTC4055/LTC4055-1 USB Power Controller and Li-Ion Charger FEATURES DESCRIPTION n Charges Single-Cell Li-Ion Batteries Directly from The LTC 4055/LTC4055-1 are USB power manager and USB Port Li-Ion battery chargers designed to work in portable n Load Dependent Charging Guarantees USB Input battery-powered applications. The parts manage and limit Current Compliance the total current used by the USB peripheral for operation n Automatic Battery Switchover When Input Supply is and battery charging. Depending on the state of the current Removed select pin (HPWR), total input current can be limited to n Constant-Current/Constant-Voltage Operation with either 100mA or 500mA. The voltage drop from the USB Thermal Feedback to Maximize Charging Rate supply or battery to the USB peripheral is typically less than Without Risk of Overheating* 100mV at 400mA and 20mV at 80mA. Other management n Selectable 500mA/100mA Current Limit features include: automatic switchover to battery when n Low Loss Full PowerPath Control with Ideal Diode input is removed, inrush current limiting, reverse current Operation (Reverse Current Blocking) blocking, undervoltage lockout and thermal shutdown. n Preset 4.2V Charge Voltage with 0.8% Accuracy The LTC4055/LTC4055-1 include a complete constant- (4.1V for LTC4055-1) current/constant-voltage linear charger for single-cell n 4.1V Float Voltage (LTC4055-1) Improves Battery Life Li-ion batteries. The oat voltage applied to the battery and High Temperature Safety Margin is held to a tight 0.8% tolerance, and charge current is n USB-Compliant Suspend Mode programmable using an external resistor to ground. Fully n Programmable Charge Current and Termination Timer discharged cells are automatically trickle charged at 10% n Soft-Start Limits Inrush Current of the programmed current until the cell voltage exceeds n NTC Thermistor Input for Temperature Quali ed 2.8V. Total charge time is programmable by an external Charging capacitor to ground. When the battery drops 100mV below n Tiny (4mm 4mm 0.75mm) QFN Package the oat voltage, automatic recharging of the battery occurs. Also featured is an NTC thermistor input used to APPLICATIONS monitor battery temperature while charging. n Portable USB Devices: Cameras, MP3 Players, PDAs The LTC4055/LTC4055-1 are available in a 16-pin low L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. pro le (4mm 4mm) QFN package. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Protected by U.S. Patent, including 6522118. TYPICAL APPLICATION Input and Battery Current vs Load Current R = R = 97.6k PROG CLPROG 600 5V (NOM) I TO SYSTEM IN FROM USB IN1 OUT 500 LOADS CABLE V BUS IN2 BAT 10F 1 + Li-Ion 400 V NTC CELL 10F I LOAD NTC 300 LTC4055 WALL CHRG 200 SHDN ACPR I BAT SUSPEND USB POWER SUSP CHARGING 100 500mA/100mA SELECT HPWR TIMER PROG CLPROG GND 0 I BAT (IDEAL DIODE) 0.1F 97.6k 97.6k 100 0 100 200 300 400 500 600 4055 TA01 4055 TA02 I (mA) LOAD 4055fb 1 CURRENT (mA)LTC4055/LTC4055-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2, 3, 4, 5) Terminal Voltage TOP VIEW IN1, IN2, OUT, BAT .................................. 0.3V to 6V NTC, V , TIMER, NTC 16 15 14 13 PROG, CLPROG ..................... 0.3V to (VCC + 0.3V) IN2 1 12 TIMER BAT 2 11 PROG CHRG, HPWR, SUSP, SHDN, 17 OUT 3 10 GND WALL, ACPR ........................................... 0.3V to 6V IN1 CLPROG 4 9 IN2 ........................................................... V + 0.1V IN1 5 6 7 8 Pin Current (DC) IN1, IN2, OUT, BAT (Note 7) ............................... 1.6A UF PACKAGE Operating Temperature Range................. 40C to 85C 16-LEAD (4mm s 4mm) PLASTIC QFN Maximum Operating Junction Temperature ......... 125C T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 17) 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 LTC4055EUF PBF LTC4055EUF TRPBF 4055 40C to 85C 16-Lead (4mm 4mm) Plastic QFN LTC4055EUF-1 PBF LTC4055EUF-1 TRPBF 40551 40C to 85C 16-Lead (4mm 4mm) 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: