LTC3101 Wide V , Multi-Output IN DC/DC Converter and PowerPath Controller FEATURES DESCRIPTION n Low Loss PowerPath Control: Seamless, The LTC 3101 is a complete power management solution Automatic Transition from Battery to USB or for low power portable devices. It provides three high Wall Adapter Power ef ciency switching DC/DC converters which seamlessly n Wide V Range: 1.8V to 5.5V transition from battery to USB/wall adapter power when IN n Buck-Boost V : 1.5V to 5.25V available. A synchronous buck-boost regulator provides OUT n Buck-Boost Generates 3.3V at 300mA for complete exibility, allowing operation from a single V 1.8V, 3.3V at 800mA for V 3V Li-Ion/Polymer battery, 2 to 3 AA cells, a USB port or any IN IN n Dual 350mA Buck Regulators, V : 0.6V to V other power source operating from 1.8V to 5.5V. OUT IN n 38A Quiescent Current in Burst Mode Operation Two always-alive outputs, a 50mA LDO and a 200mA MAX n 1.8V, 50mA Always-On LDO output that tracks the higher voltage input supply, provide n Protected 100mA Hot Swap Output power for critical functions or additional external regula- n Pushbutton On/Off Control tors. Flash memory cards can be directly powered from n Current Limited 200mA MAX Output the protected 100mA Hot Swap output. Pushbutton control n Programmable Power-Up Sequencing logic and a programmable-duration microprocessor reset n 24-lead 4mm 4mm 0.75mm QFN Package generator simplify interfacing to a microprocessor while internal sequencing and independent enable pins provide APPLICATIONS exible power-up options. The LTC3101 is available in a low n pro le (0.75mm) 24-lead 4mm 4mm QFN package. Ultra-Portable Digital Video Cameras n L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks Personal Handheld GPS Navigators and Hot Swap and PowerPath are trademarks of Linear Technology Corporation. All other n Portable Medical Instruments trademarks are the property of their respective owners. TYPICAL APPLICATION V = 3.3V OUT3 300mA FOR V 1.8V IN + 800mA FOR V 3V 2 AA IN 10F 10F 1M CELLS 4.7H Ef ciency vs V BAT 96 221k BUCK-BOOST BAT1 BAT2 SW3A SW3B OUT3 USB/WALL I = 150mA OUT ADAPTER USB1 FB3 94 4.3V TO 5.5V USB2 10F HSO Hot Swap OUTPUT: 3.3V AT 100mA MAX TRACKING OUTPUT: 200mA C LDO 1.8V AT 50mA 92 RS 4.7F 0.1F BUCK2 4.7H V OUT2 90 ENA1 I = 150mA OUT SW2 1.8V DIS ENA ENA2 BUCK1 350mA 10F LTC3101 ENA3 221k I = 150mA OUT 88 ON/OFF FB2 110k PWRKEY 86 4.7H V OUT1 PBSTAT SW1 1.5V PWM 84 P 350mA 10F 221k 1.5 2.5 3.5 4.5 5.5 PWRON FB1 V (V) RESET BAT GND 3101 TA01b 147k 3101 TA01a 3101fb 1 EFFICIENCY (%)LTC3101 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V , V , V , V ......................... 0.3V to 6V TOP VIEW BAT1 BAT2 USB1 USB2 V , V , V , V SW1 SW2 SW3A SW3B DC ............................................................ 0.3V to 6V 24 23 22 21 20 19 Pulsed (<100ns) ...................................... 1.0V to 7V PWM 1 18 HSO Voltage (All Other Pins) ................................ 0.3V to 6V SW1 2 17 OUT3 BAT1 3 16 USB2 Operating Temperature Range (Note 2).... 40C to 85C 25 GND USB1 4 15 SW3A Maximum Junction Temperature (Note 5)............. 125C SW2 BAT2 5 14 Storage Temperature Range ................... 65C to 150C PWRON 6 13 RESET 7 8 9 10 11 12 UF PACKAGE 24-LEAD (4mm 4mm) PLASTIC QFN T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3101EUF PBF LTC3101EUF TRPBF 3101 40C to 85C 24-Lead (4mm 4mm) Plastic QFN Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: