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LTC3891 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3891 Datasheet(HTML) 1 Page - Linear Technology |
1 / 40 page LTC3890-2 1 38902f 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 Selectable Current Limit n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Power Good Output Voltage Monitors n Low Shutdown IQ : < 14μA n Internal LDO Powers Gate Drive from VIN or EXTVCC n Small Low Profile (0.75mm) 5mm × 5mm QFN 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®3890-2 is a high performance dual step-down switching regulator DC/DC controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase- lockable frequency of up to 850kHz. Power loss and noise due to the ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase. The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensa- tion 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 output voltages during start-up. Current mode control limits 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. OUTPUT CURRENT (A) 0 70 100 1 0.1 0.01 0.001 0.0001 10 38902 TA01b 50 40 30 20 1 10 100 1000 10000 0.1 10 60 80 90 VIN = 12V VOUT = 3.3V 0.1μF 100k 4.7μH 1000pF 470μF 22μF 0.008Ω 31.6k 34.8k VOUT1 3.3V 5A 330μF 0.1μF 4.7μF 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 38902 TA01a 0.1μF 0.1μF LTC3890-2 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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