LTC1702 Dual 550kHz Synchronous 2-Phase Switching Regulator Controller FEATURES DESCRIPTIO The LTC 1702 is a dual switching regulator controller opti- Two Independent Controllers in One Package mized for high efficiency with low input voltages. It includes Two Sides Run Out-of-Phase to Minimize C IN two complete, on-chip, independent switching regulator All N-Channel External MOSFET Architecture controllers each designed to drive a pair of external N-channel No External Current Sense Resistors MOSFET devices in a voltage mode feedback, synchronous Excellent Output Regulation: 1% Total Output buck configuration. The LTC1702 uses a constant-frequency, Accuracy true PWM design switching at 550kHz, minimizing external 550kHz Switching Frequency Minimizes External component size and cost and maximizing load transient Component Size performance. The synchronous buck architecture automati- 1A to 25A Output Current per Channel TM cally shifts to discontinuous and then to Burst Mode High Efficiency over Wide Load Current Range operation as the output load decreases, ensuring maximum Quiescent Current Drops Below 100A in Shutdown efficiency over a wide range of load currents. Small 24-Pin Narrow SSOP Package U The LTC1702 features an onboard reference trimmed to APPLICATIO S 0.5% and can provide better than 1% regulation at the converter outputs. Open-drain logic outputs indicate whether Microprocessor Core and I/O Supplies either output has risen to within 5% of the final output voltage Multiple Logic Supply Generator and an optional latching FAULT mode protects the load if the Distributed Power Applications output rises 15% above the intended voltage. Each channel High Efficiency Power Conversion can be enabled independently with both channels disabled, , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the the LTC1702 shuts down and supply current drops below property of their respective owners. Protected by U.S. Patents including 5481178, 100A. 5847554, 6304066, 6307356, 6580258. TYPICAL APPLICATIO Dual Output High Power 3.3V/2.5V Logic Supply V = 5V 10% IN C , C : PANASONIC EEFUE0G181R OUT1 OUT2 + C C : KEMET TS10X337M010AS IN IN D1 10 10F D2 330F D1, D2: MOTOROLA MBR0520LT1 3 D3, D4: MOTOROLA MBRS320T3 1F L1, L2: SUMIDA CEP125-1R0 27k 1 24 Q1 TO Q8: FAIRCHILD FDS6670A PV I 1F CC MAX2 1F 1F 2 23 10F BOOST1 BOOST2 3 22 BG1 BG2 Q1 Q2 Q5 Q6 L1 L2 4 21 1H TG1 TG2 1H V OUT1 5 20 V OUT2 2.5V SW1 SW2 3.3V/15A AT 15A 27k 6 19 D3 Q3 Q4 D4 Q7 Q8 I PGND + C MAX1 OUT1 1F LTC1702 180F 7 18 1.2k 1.6k PGOOD1 PGOOD2 4 8 17 + C OUT2 FCB FAULT 10k 820pF 15.8k 1F 180F 1% 680pF 1% 9 16 4 RUN/SS RUN/SS2 1F 10 15 1F COMP1 COMP2 4.99k 4.75k 47k 68k 11 14 1% 1% SGND FB2 V V IN IN 12 13 680pF 27pF 27pF 3300pF FB1 V CC 10k 10k PWRGD2 PWRGD1 1702 TA01 FAULT 1702fa 1 U ULTC1702 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) TOP VIEW Supply Voltage 1 24 I PV CC MAX2 V ........................................................................ 7V BOOST1 2 23 BOOST2 CC 3 22 BG2 BOOSTn............................................................... 15V BG1 4 TG2 TG1 21 BOOSTn SWn .................................................... 7V SW1 5 20 SW2 Input Voltage 6 19 PGND I MAX1 SWn .......................................................... 1V to 8V 7 PGOOD2 PGOOD1 18 All Other Inputs ......................... 0.3V to V + 0.3V CC FCB 8 17 FAULT Peak Output Current < 10s 9 16 RUN/SS2 RUN/SS1 TGn, BGn ............................................................... 5A 10 COMP2 COMP1 15 Operating Temperature Range SGND 11 14 FB2 12 13 V FB1 LTC1702C ............................................... 0C to 70C CC LTC1702I........................................... 40C to 85C GN PACKAGE 24-LEAD NARROW PLASTIC SSOP Storage Temperature Range ................. 65C to 150C T = 125C, = 100C/ W JMAX JA Lead Temperature (Soldering, 10 sec).................. 300C ORDER PART NUMBER LTC1702CGN LTC1702IGN Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: