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LTC3835 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3835 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  LTC3890-3 1 38903f For more information www.linear.com/3890-3 Typical applicaTion FeaTures applicaTions DescripTion 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller High Efficiency Dual 8.5V/3.3V Output Step-Down Converter n Wide VIN Range: 4V to 60V (65V Abs Max) n Low Operating IQ: 50µA (One Channel On) n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n RSENSE or DCR Current Sensing n Out-of-Phase Controllers Reduce Input Capacitance and Power Supply Induced Noise n Phase-Lockable Frequency (75kHz to 850kHz) n Programmable Fixed Frequency (50kHz to 900kHz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Power Good Output Voltage Monitor n Low Shutdown IQ: <14µA n Internal LDO Powers Gate Drive from VIN or EXTVCC n Narrow SSOP Package n Automotive Always-On Systems n Battery Operated Digital Devices n Distributed DC Power Systems Efficiency and Power Loss vs Output Current The LTC®3890-3 is a high performance dual step-down switching regulator DC/DC controller that drives all N-channelsynchronouspowerMOSFETstages.Aconstant frequency current mode architecture allows a phase- lockablefrequencyofupto850kHz.Powerlossandsupply noise are minimized by operating the two controller output stages out-of-phase. The 50μA no-load quiescent current extends operating life in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Independent TRACK/SS pins for each controller ramp the outputvoltagesduringstart-up.Currentmodecontrollimits the inductor current during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads. For versions with different and/or additional features, see the LTC3890 family summary, Table 1, in the Pin Functions section of this data sheet. 0.1µF 100k 4.7µH 1000pF 470µF 4.7µF 22µF 0.008Ω 31.6k 34.8k VOUT1 3.3V 5A 330µF 0.1µF 100k 8µH 1000pF 0.01Ω 10.5k 34.8k VOUT2 8.5V 3A TG1 TG2 BOOST1 BOOST2 SW1 SW2 BG1 BG2 SGND PGND SENSE1+ SENSE2+ SENSE1– SENSE2– VFB1 VFB2 ITH1 ITH2 VIN INTVCC TRACK/SS1 TRACK/SS2 VIN 9V TO 60V 38903 TA01a 0.1µF 0.1µF LTC3890-3 OUTPUT CURRENT (A) 0 70 100 1 0.1 0.01 0.001 0.0001 10 38903 TA01b 50 40 30 20 1 10 100 1000 10000 0.1 10 60 80 90 VIN = 12V VOUT = 3.3V 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 property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258, 7230497. |
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