POWER LOSS (W) LTC3529 1.5A, 1.5MHz Step-Up DC/DC Converter in 2mm 3mm DFN FEATURES DESCRIPTION n Compact Solution for 5V USB On-The-Go The LTC 3529 is a 5V output, synchronous, xed frequency V Power step-up DC/DC converter optimized for USB On-The-Go BUS n 5V at 500mA from Single Li-Ion Cell (OTG) hosting applications. This compact USB OTG 5V n Automatic Fault Detection V converter features a 1.5MHz switching frequency, BUS n High Ef ciency: Up to 95% internal compensation and a tiny 2mm 3mm DFN pack- n V Range: 1.8V to 5.25V age. The LTC3529 can operate from input voltages as low IN n Fixed 5V Output as 1.8V. n Short-Circuit Protection USB OTG-speci c features include a fault ag with 22ms n 1.5MHz Low Noise, Fixed Frequency PWM deglitching to indicate when the bus is overloaded, output n Inrush Current Limiting and Internal Soft-Start disconnect and short-circuit protection. Following a fault, n Output Disconnect the LTC3529 can be programmed to either latchoff or n <1A Quiescent Current in Shutdown restart after a time-out duration. n V > V Operation IN OUT n Additional features include a <1A shutdown mode, 8-Lead, 2mm 3mm DFN Package soft-start, inrush current limiting and thermal overload protection. Anti-ring circuitry reduces EMI during low APPLICATIONS power operation. The LTC3529 is offered in an 8-lead n Personal Media Players 2mm 3mm 0.75mm DFN package. n Digital Video Cameras L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Digital Multimedia Broadcast Tuners Protected by U.S. Patents including 6404251, 6166527. n Digital Cameras n Smart Phones TYPICAL APPLICATION Li-Ion Battery to 5V Synchronous Boost Converter Ef ciency vs Load Current 100 0.9 4.7H 90 0.8 2.5V + 80 TO Li-Ion 0.7 3.3F EFFICIENCY LTC3529 4.2V 70 V SW 0.6 IN 370 60 0.5 FAULT SNSGND 50 0.4 V OUT 40 AUTO-RESTART OFF ON RST V OUT 5V 0.3 C OUT 500mA 30 10F 0.2 20 OFF ON SHDN PGND POWER LOSS 0.1 10 3529 TA01a 0 0 1 10 100 1000 LOAD CURRENT (mA) 3529 TA01b V = 3.6V IN INDUCTOR = 4.7H, COOPER BUSSMANN SD25-4R7 3529fb 1 EFFICIENCY (%)LTC3529 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , V Voltage ........................................... 0.3 to 6V IN OUT 8 V 1 V OUT IN SHDN, RST, FAULT Voltage ............................ 0.3 to 6V SW 2 7 RST SW Voltage 9 SHDN 3 6 SNSGND DC .............................................................. 0.3 to 6V PGND 4 5 FAULT Pulsed <100ns .............................................1V to 7V DCB PACKAGE Operating Temperature Range (Note 2) ...40C to 85C 8-LEAD (2mm s 3mm) PLASTIC DFN Maximum Junction Temperature (Note 3) ............ 125C T = 125C, = 64C/W JMAX JA EXPOSED PAD (PIN 9) 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 LTC3529EDCB PBF LTC3529EDCB TRPBF LCTZ 40C to 85C 8-Lead (2mm 3mm) Plastic DFN 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: