LTC3428 4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm 3mm DFN FEATURES DESCRIPTION n High Ef ciency: Up to 92% The LTC 3428 is a 2-phase, current mode boost con- n 2-Phase Control Reduces Output Voltage Ripple verter, capable of supplying 2A at 5V from a 3.3V input. n 5V at 2A from 3.3V Input Two 93m, 2A N-channel MOSFET switches allow the n 3.3V at 1.5A from 1.8V Input LTC3428 to deliver high ef ciency from input voltages as n 1.6V to 5.25V Adjustable Output Voltage low as 1.6V. n 1.6V to 4.5V Input Range External parts count and size are minimized by a 1MHz n Internal Soft-Start Operation switching frequency and a 2-phase design. Two phase n Low Shutdown Current: <1A operation signi cantly reduces peak inductor currents and n Uses Small Surface Mount Components capacitor ripple current, doubling the effective switching n 10-Pin 3mm 3mm DFN Package frequency and minimizing inductor and capacitor size. External compensation allows the feedback loop response to be optimized for a particular application. APPLICATIONS n Other features include: an active low shutdown pin re- Networking Equipment n duces supply current to below 1A, internal soft-start, Handheld Instruments n antiringing control and thermal shutdown. The LTC3428 Digital Cameras n is available in a low pro le (0.75mm) 10-lead (3mm Distributed Power n 3mm) DFN package. Local 3.3V to 5V Conversion L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 3.3V to 5V at 2A Converter Ef ciency vs Load Current V 95 IN 3.3V 90 85 2.2H* 2.2H* 4.7F*** 80 V OUT V V IN OUT 75 5V/2A ** OFF ON SHDN SWA 70 383k ** LTC3428 V SWB C 65 10k 22pF AGND FB 60 PGNDA PGNDB 1000pF 121k 22F**** 55 V = 3.3V IN V = 5V 50 OUT 3428 TA01 L = 2.2H * TOKO FDV06302R2 45 ** PHILIPS PMEG1020 0.1 12 *** TAIYO YUDEN X5R JMK212BJ475MD LOAD CURRENT (A) **** TAIYO YUDEN X5R JMK316BJ226ML 3428 TA02 3428fb 1 EFFICIENCY (%)LTC3428 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , V , SWA, SWB Voltage ........................ 0.3 to 6V IN OUT SWA, SWB Voltage, Pulsed, <100ns ...........................7V PGNDA 1 10 PGNDB SWA 9 SWB 2 SHDN, V , FB Voltage .................................... 0.3 to 6V C 11 V 3 V 8 OUT IN Operating Temperature Range (Note 2)....40C to 85C 4 7 SHDN AGND Storage Temperature Range ...................65C to 125C V 5 6 FB C DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFNs EXPOSED PAD MUST BE SOLDERED TO GROUND PLANE ON PCB T = 125C, = 45C/W JMAX JA = 3C/W JC ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3428EDD PBF LTC3428EDD TRPBF LBBG 40C to 85C 10-Lead (3mm 3mm) Plastic DFN LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3428EDD LTC3428EDD TR LBBG 10-Lead (3mm 3mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. For more information on lead free part marking, go to: