LTC3416 4A, 4MHz, Monolithic Synchronous Step-Down Regulator with Tracking FEATURES DESCRIPTIO High Efficiency: Up to 95% The LTC 3416 is a high efficiency monolithic synchro- 4A Output Current nous, step-down DC/DC converter utilizing a constant Low R Internal Switch: 67m frequency, current mode architecture. It operates from an DS(ON) Tracking Input to Provide Easy Supply Sequencing input voltage range of 2.25V to 5.5V and provides a 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 of on-resistance increases effi- 0.8V Reference Allows Low Output Voltage ciency and eliminates the need for an external Schottky Low Dropout Operation: 100% Duty Cycle diode. Switching frequency is set by an external resistor. Power Good Output Voltage Monitor 100% duty cycle provides low dropout operation extend- Overtemperature Protected ing battery life in portable systems. OPTI-LOOP compen- Available in a 20-Lead Thermally Enhanced sation allows the transient response to be optimized over TSSOP Package a wide range of loads and output capacitors. The LTC3416 operates in forced continuous operation and U provides tracking of another power supply rail. Forced APPLICATIO S continuous operation reduces noise and RF interference and Portable Instruments provides excellent transient response. Fault protection is Notebook Computers provided by an overcurrent comparator, and adjustable Distributed Power Systems compensation allows the transient response to be optimized Battery-Powered Equipment over a wide range of loads and output capacitors. POL Board Power , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. OPTI-LOOP is a registered trade- mark of Linear Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131, 6724174. TYPICAL APPLICATIO V OUT2 I/O VOLTAGE 2.5V 100 V IN 90 2.5V TO 5.5V V = 2.5V 22F IN 80 SVIN PVIN 70 R PGOOD 0.2H T V V = 3.3V OUT1 IN 127k 60 SW 1.8V 4A LTC3416 50 100F 2 RUN/SS PGND 40 I SGND TH 30 TRACK V 7.5k FB 20 820pF 10 V = 1.8V OUT f = 2MHz 255k 255k 0 0.01 0.10 1 10 3416 F01a LOAD CURRENT (A) 200k 200k 3416 G09 Figure 1a. 2.5V/4A Step-Down Regulator with Tracking Figure 1b. Efficiency vs Load Current 3416fa 1 EFFICIENCY (%) U ULTC3416 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART Input Supply Voltage .................................. 0.3V to 6V 1 NUMBER I , RUN, V Voltages .............................. 0.3V to V PGND 20 PGND TH FB IN 2 R 19 V TRACK Voltage .......................................... 0.3V to V T FB IN LTC3416EFE 3 TRACK 18 I TH SW Voltage .................................. 0.3V to (V + 0.3V) IN 4 RUN/SS 17 PGOOD Operating Ambient Temperature Range 5 SGND 16 SV IN (Note 2) .................................................. 40C to 85C 21 6 NC 15 NC Junction Temperature (Notes 5, 6) ...................... 125C 7 PV 14 PV IN IN Storage Temperature Range ................ 65C to 150C 8 SW 13 SW Lead Temperature (Soldering, 10 sec)................. 300C 9 SW 12 SW 10 PGND 11 PGND FE PACKAGE 20-LEAD PLASTIC TSSOP T = 125C, = 38C/W, = 10C/W JMAX JA JC EXPOSED PAD IS GND (PIN 21) MUST BE SOLDERED TO PCB Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: