POWER LOSS (mW) LTC4080 500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck FEATURES DESCRIPTION n Complete Linear Battery Charger with Integrated The LTC 4080 is a complete constant-current/constant- Buck Converter voltage linear battery charger for a single-cell 4.2V lithium-ion battery with an integrated 300mA synchronous Battery Charger: buck converter. The small packages and low external n Constant-Current/Constant-Voltage Operation component count make the LTC4080 especially suitable withThermal Feedback to Maximize Charge Rate for portable applications. Furthermore, LTC4080 is specifi- without Risk of Overheating cally designed to work within USB power specifications. n Internal 4.5-Hour Safety Timer for Termination n Charge Current Programmable Up to 500mA with The CHRG pin indicates when charge current has 5% Accuracy dropped to ten percent of its programmed value (C/10). n C/10 Charge Current Detection Output An internal 4.5-hour timer terminates the charge cycle. n 5A Supply Current in Shutdown Mode The full-featured LTC4080 battery charger also includes trickle charge, automatic recharge and soft-start (to limit Switching Regulator: inrush current). n High Efficiency Synchronous Buck Converter n 300mA Output Current The LTC4080 integrates a synchronous buck converter n 2.7V to 4.5V Input Range (Powered from BAT Pin) that is powered from the BAT pin. It has an adjustable n 0.8V to V Output Range output voltage and can deliver up to 300mA of load cur- BAT n MODE Pin Selects Fixed (2.25MHz) Constant-Frequency rent. The buck converter also features low current high PWM Mode or Low I (23A) Burst Mode Operation efficiency Burst Mode operation that can be selected by CC n 2A BAT Current in Shutdown Mode the MODE pin. The LTC4080 is available in 10-lead, low profile (0.75mm) APPLICATIONS 3mm 3mm DFN and MSOP Exposed Pad packages. n L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks Wireless Headsets and ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other n Bluetooth Applications trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118. n Portable MP3 Players n Multifunction Wristwatches Buck Efficiency vs Load Current TYPICAL APPLICATION (V = 1.8V) OUT Li-Ion Battery Charger with 1.8V Buck Regulator 100 1000 500mA EFFICIENCY 80 100 (Burst) V 4.2V CC V BAT CC EFFICIENCY C + BAT Li-Ion (3.75V POWER (PWM) EN BUCK 4.7F BATTERY to 5.5V) L1, 1OH 60 LOSS 10 (PWM) EN CHRG SW C R1 PL LTC4080 10pF 40 0 1M V POWER LOSS OUT MODE FB (1.8V/300mA) (Burst) C IN V = 3.8V GND PROG BAT 4.7F 20 0.1 R2 C V = 1.8V OUT OUT R PROG 806k 4.7F L = 10H 806 C = 4.7F 0 0.01 4080 TA01a 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 4080 TA01b 4080fc 1 For more information www.linear.com/LTC4080 EFFICIENCY (%)LTC4080 (Note 1) ABSOLUTE MAXIMUM RATINGS V , t < 1ms and Duty Cycle < 1% ............... 0.3V to 7V BAT Pin Current .................................................. 800mA CC V Steady State .......................................... 0.3V to 6V PROG Pin Current ....................................................2mA CC BAT, CHRG ................................................... 0.3V to 6V Junction Temperature ............................................125C EN CHRG, PROG, ACPR ..................0.3V to V + 0.3V Operating Temperature Range (Note 2)....40C to 85C CC MODE, EN BUCK ...........................0.3V to V + 0.3V Storage Temperature Range .................. 65C to 125C BAT FB ................................................................ 0.3V to 2V Lead Temperature (MSE, Soldering, 10 sec) .........300C BAT Short-Circuit Duration ...........................Continuous PIN CONFIGURATION TOP VIEW TOP VIEW BAT 1 10 SW 10 SW BAT 1 V 2 9 EN BUCK CC V 2 9 EN BUCK CC 11 3 EN CHRG 8 MODE EN CHRG 3 11 8 MODE PROG 4 7 FB PROG 4 7 FB ACPR 5 6 CHRG ACPR 5 6 CHRG MSE PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 40C/W JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB T = 110C, = 43C/W (NOTE 3) JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4080EDD PBF LTC4080EDD TRPBF LBXD 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC4080EMSE PBF LTC4080EMSE TRPBF LTCQH 10-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: