LTC3413 3A, 2MHz Monolithic Synchronous Regulator for DDR/QDR Memory Termination FEATURES DESCRIPTION n High Ef ciency: Up to 90% The LTC 3413 is a high ef ciency monolithic synchro- n 3A Output Current nous step-down DC/DC converter utilizing a constant n Symmetrical Source and Sink Output Current Limit frequency, current mode architecture. It operates from n Low R Internal Switch: 85m an input voltage range of 2.25V to 5.5V and provides a DS(ON) n No Schottky Diode Required regulated output voltage equal to (0.5)V while sourcing REF n 2.25V to 5.5V Input Voltage Range or sinking up to 3A of output current. An internal voltage n V = V /2 divider reduces component count and eliminates the need OUT REF n 1% Output Voltage Accuracy for external resistors by dividing the reference voltage in n Programmable Switching Frequency: Up to 2MHz half. The internal synchronous power switch with 85m n Power Good Output Voltage Monitor on-resistance increases ef ciency and eliminates the need n Overtemperature Protected for an external Schottky diode. Switching frequencies up n Available in 16-Lead TSSOP Exposed Pad Package to 2MHz are set by an external resistor. Forced-continuous operation in the LTC3413 reduces APPLICATIONS noise and RF interference. Fault protection is provided by an overcurrent comparator that limits output current n Bus Termination: DDR and QDR Memory, during both sourcing and sinking operations. Adjustable SSTL, HSTL, ... compensation allows the transient response to be optimized n Notebook Computers over a wide range of loads and output capacitors. n Distributed Power Systems , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178. TYPICAL APPLICATION V 100 IN 2.5V V = 2.5V IN 22F 90 f = 1MHz 80 SV PV IN IN L1 70 PGOOD 0.47H V OUT 60 1.25V V SW REF C OUT 3A 4.7M 50 LTC3413 100F RUN/SS PGND s 2 40 330pF SGND 5.11k 30 I TH 20 R V T FB 2200pF 10 3413 F01a 0 309k 0.01 0.1 1 10 L1: VISHAY DALE IHLP-2525CZ-01 0.47 C : TDK C4532X5R0J107M OUT LOAD CURRENT (A) 3413 F01b Figure 1a. High Ef ciency Bus Termination Supply Figure 1b. Ef ciency vs Load Current 3413fc 1 EFFICIENCY (%)LTC3413 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) SV , PV Supply Voltages ......................... 0.3V to 6V IN IN TOP VIEW I , RUN/SS, V , PGOOD Voltages ............ 0.3V to V TH FB IN SV 1 16 PV V Voltage ................................................ 0.3V to V IN IN REF IN PGOOD 2 15 SW SW Voltage ................................... 0.3V to (V + 0.3V) IN I 3 14 SW TH Operating Ambient Temperature Range V 4 13 PGND FB 17 (Note 2) ................................................... 40C to 85C R 5 12 PGND T Junction Temperature (Notes 5, 8)....................... 125C V 6 11 SW REF Storage Temperature Range ................. 65C to 150C RUN/SS 7 10 SW Lead Temperature (Soldering, 10 sec) ................ 300C SGND 8 9 PV IN FE PACKAGE 16-LEAD PLASTIC TSSOP T = 125C, = 38C/W, = 10C/W JMAX JA JC EXPOSED PAD (PIN 17) MUST BE SOLDERED TO PGND ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3413EFE PBF LTC3413EFE TRPBF 3413EFE 16-Lead Plastic TSSOP 40C to 85C LTC3413IFE PBF LTC3413IFE TRPBF 3413IFE 16-Lead Plastic TSSOP 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3413EFE LTC3413EFE TR 3413EFE 16-Lead Plastic TSSOP 40C to 85C LTC3413IFE LTC3413IFE TR 3413IFE 16-Lead Plastic TSSOP 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: