LTC3414 4A, 4MHz, Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO High Efficiency: Up to 95% The LTC 3414 is a high efficiency monolithic synchro- 4A Output Current nous, step-down DC/DC converter utilizing a constant Low Quiescent Current: 64A frequency, current mode architecture. It operates from an Low R Internal Switch: 67m input voltage range of 2.25V to 5.5V and provides a DS(ON) Programmable Frequency: 300KHz to 4MHz regulated output voltage from 0.8V to 5V while delivering 2.25V to 5.5V Input Voltage Range up to 4A of output current. The internal synchronous 2% Output Voltage Accuracy power switch with 67m on-resistance increases effi- 0.8V Reference Allows Low Output Voltage ciency and eliminates the need for an external Schottky Selectable Forced Continuous/Burst Mode Operation diode. Switching frequency is set by an external resistor or with Adjustable Burst Clamp can be synchronized to an external clock. 100% duty cycle Synchronizable Switching Frequency provides low dropout operation extending battery life in Low Dropout Operation: 100% Duty Cycle portable systems. OPTI-LOOP compensation allows the Power Good Output Voltage Monitor transient response to be optimized over a wide range of Overtemperature Protected loads and output capacitors. Available in 20-Lead Exposed TSSOP Package The LTC3414 can be configured for either Burst Mode U operation or forced continuous operation. Forced continu- APPLICATIO S ous operation reduces noise and RF interference while Point-of-Load Regulation Burst Mode operation provides high efficiency by reduc- Notebook Computers ing gate charge losses at light loads. In Burst Mode Portable Instruments operation, external control of the burst clamp level allows Distributed Power Systems the output voltage ripple to be adjusted according to the requirements of the application. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, Including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, 6724174 TYPICAL APPLICATIO 22F V LTC3414 Efficiency Curve IN 2.7V TO 5.5V 100 Burst Mode OPERATION PV SV IN IN 95 RT 2.2M PGOOD 90 0.47 H LTC3414 85 294k V OUT SW 2.5V AT 4A 80 FORCED C * OUT CONTINUOUS RUN/SS PGND 75 1000pF R * ITH 70 I SGND TH 65 SYNC/MODE V FB 470pF 60 3414 F01a 55 110k 392k 75k 50 0.001 0.01 0.1 1.0 10 LOAD CURRENT (A) *Burst Mode OPERATION: C = 470F SANYO POSCAP 4TPB470M, R = 20k OUT ITH 3414 F01b FORCED CONTINUOUS: C = (2) 100 F TDKC4532X5ROJ107M, R = 12.1k OUT ITH Figure 1. 2.5V/4A Step-Down Regulator 3414fb 1 EFFICIENCY (%) U ULTC3414 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART Input Supply Voltage ................................... 0.3V to 6V PGND 1 20 PGND NUMBER RT 2 19 V I , RUN/SS, V , FB TH FB SYNC/MODE 3 18 I TH SYNC/MODE Voltages .................................. 0.3 to V IN LTC3414EFE RUN/SS 4 17 PGOOD SGND 5 16 SV SW Voltages ................................. 0.3V to (V + 0.3V) IN IN 21 LTC3414IFE NC 6 15 NC Peak SW Sink and Source Current ......................... 9.5A LTC3414MPFE PV 7 14 PV IN IN SW 8 13 SW Operating Temperature Range (Note 2) SW 9 12 SW E, I Grades .............................................. 40C to 85C PGND 10 11 PGND MP Grade ............................................. 55C to 125C FE PACKAGE 20-LEAD PLASTIC TSSOP Junction Temperature (Notes 5, 6) ....................... 125C EXPOSED PAD (PIN 21), MUST BE SOLDERED TO PCB T = 125C, = 38C/W, = 10C/W Storage Temperature Range ................. 65C to 150C JMAX JA JC Lead Temperature (Soldering, 10 sec).................. 300C Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: