POWER LOSS (mW) LTC3890-3 60V Low I , Dual, 2-Phase Q Synchronous Step-Down DC/DC Controller FeaT DescripT n Wide V Range: 4V to 60V (65V Abs Max) The LTC 3890-3 is a high performance dual step-down IN n switching regulator DC/DC controller that drives all Low Operating I : 50A (One Channel On) Q n N-channel synchronous power MOSFET stages. A constant Wide Output Voltage Range: 0.8V V 24V OUT n frequency current mode architecture allows a phase- R or DCR Current Sensing SENSE n lockable frequency of up to 850kHz. Power loss and supply Out-of-Phase Controllers Reduce Input Capacitance noise are minimized by operating the two controller output and Power Supply Induced Noise stages out-of-phase. n Phase-Lockable Frequency (75kHz to 850kHz) n Programmable Fixed Frequency (50kHz to 900kHz) The 50A no-load quiescent current extends operating life n Selectable Continuous, Pulse-Skipping or Low Ripple in battery-powered systems. OPTI-LOOP compensation Burst Mode Operation at Light Loads allows the transient response to be optimized over a wide n Very Low Dropout Operation: 99% Duty Cycle range of output capacitance and ESR values. A wide 4V n Adjustable Output Voltage Soft-Start or Tracking to 60V input supply range encompasses a wide range of n Power Good Output Voltage Monitor intermediate bus voltages and battery chemistries. n Low Shutdown I : <14A Q Independent TRACK/SS pins for each controller ramp the n Internal LDO Powers Gate Drive from V or EXTV IN CC output voltages during start-up. Current mode control limits n Narrow SSOP Package the inductor current during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, Ta pulse-skipping mode, or continuous conduction mode at n Automotive Always-On Systems light loads. n Battery Operated Digital Devices n For versions with different and/or additional features, see Distributed DC Power Systems the LTC3890 family summary, Table 1, in the Pin Functions L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP, PolyPhase and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the section of this data sheet. property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258, 7230497. Typical Ta High Efficiency Dual 8.5V/3.3V Output Step-Down Converter Efficiency and Power Loss vs Output Current V IN 9V TO 60V 100 10000 22F V = 12V IN 4.7F V = 3.3V 90 OUT V INTV IN CC TG1 TG2 1000 80 0.1F 0.1F 70 BOOST1 BOOST2 4.7H 8H 60 100 SW1 SW2 50 BG1 BG2 LTC3890-3 10 40 PGND 30 + + SENSE1 SENSE2 20 1 0.01 0.008 10 V V SENSE1 SENSE2 OUT2 OUT1 0 0.1 8.5V 3.3V V V FB1 FB2 0.0001 0.001 0.01 0.1 1 10 3A 5A 100k 100k ITH1 ITH2 OUTPUT CURRENT (A) 470F 1000pF 1000pF 330F TRACK/SS1 SGND TRACK/SS2 10.5k 38903 TA01b 31.6k 34.8k 34.8k 0.1F 0.1F 38903 TA01a 38903f 1 For more information www.linear.com/3890-3 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3890-3 Ta e MaxiMMu Tar in p Fc T (Note 1) TOP VIEW Input Supply Voltage (V ) ......................... 0.3V to 65V IN Topside Driver Voltages ITH1 1 28 TRACK/SS1 V 2 27 PGOOD1 BOOST1, BOOST2 ..................................0.3V to 71V FB1 + SENSE1 3 26 TG1 Switch Voltage (SW1, SW2) ......................... 5V to 65V SENSE1 4 25 SW1 (BOOST1-SW1), (BOOST2-SW2) ................ 0.3V to 6V FREQ 5 24 BOOST1 RUN1, RUN2 ............................................... 0.3V to 8V PLLIN/MODE 6 23 BG1 Maximum Current Sourced into Pin SGND 7 22 V IN from Source >8V ...................................................100A RUN1 8 21 PGND + + SENSE1 , SENSE2 , SENSE1 RUN2 9 20 EXTV CC SENSE2 Voltages ..................................... 0.3V to 28V SENSE2 10 19 INTV CC PLLIN/MODE, INTV Voltage ..................... 0.3V to 6V + CC SENSE2 11 18 BG2 FREQ Voltage ........................................0.3V to INTV CC V 12 17 BOOST2 FB2 EXTV ..................................................... 0.3V to 14V CC ITH2 13 16 SW2 ITH1, ITH2, V , V Voltages ................... 0.3V to 6V TRACK/SS2 14 15 TG2 FB1 FB2 PGOOD1 Voltage ......................................... 0.3V to 6V GN PACKAGE 28-LEAD PLASTIC SSOP TRACK/SS1, TRACK/SS2 Voltages ............. 0.3V to 6V T = 150C, = 80C/W JMAX JA Operating Junction Temperature Range (Notes 2, 3) LTC3890E-3, LTC3890I-3 .................. 40C to 125C LTC3890H-3 ...................................... 40C to 150C LTC3890MP-3 .................................... 55C to 150C Storage Temperature Range .................. 65C to 150C Der inFMTa LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3890EGN-3 PBF LTC3890EGN-3 TRPBF LTC3890GN-3 28-Lead Plastic SSOP 40C to 125C LTC3890IGN-3 PBF LTC3890IGN-3 TRPBF LTC3890GN-3 28-Lead Plastic SSOP 40C to 125C LTC3890HGN-3 PBF LTC3890HGN-3 TRPBF LTC3890GN-3 28-Lead Plastic SSOP 40C to 150C LTC3890MPGN-3 PBF LTC3890MPGN-3 TRPBF LTC3890GN-3 28-Lead Plastic SSOP 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: