POWER LOSS (mW) LTC3890 60V Low I , Dual, 2-Phase Q Synchronous Step-Down DC/DC Controller FEATURES DESCRIPTION n Wide V Range: 4V to 60V (65V Abs Max) The LTC 3890 is a high performance dual step-down IN n Low Operating I : 50A (One Channel On) switching regulator DC/DC controller that drives all Q n Wide Output Voltage Range: 0.8V V 24V N-channel synchronous power MOSFET stages. A constant OUT n R or DCR Current Sensing frequency current mode architecture allows a phase- SENSE n Out-of-Phase Controllers Reduce Required Input lockable frequency of up to 850kHz. Power loss and noise Capacitance and Power Supply Induced Noise due to the ESR of the input capacitor are minimized by n Phase-Lockable Frequency (75kHz to 850kHz) operating the two controller output stages out-of-phase. n Programmable Fixed Frequency (50kHz to 900kHz) The 50A no-load quiescent current extends operating run n Selectable Continuous, Pulse-Skipping or Low Ripple time in battery-powered systems. OPTI-LOOP compensa- Burst Mode Operation at Light Loads tion allows the transient response to be optimized over n Selectable Current Limit a wide range of output capacitance and ESR values. The n Very Low Dropout Operation: 99% Duty Cycle LTC3890 features a precision 0.8V reference and power n Adjustable Output Voltage Soft-Start or Tracking good output indicators. A wide 4V to 60V input supply n Power Good Output Voltage Monitors range encompasses a wide range of intermediate bus n Output Overvoltage Protection voltages and battery chemistries. n Low Shutdown I : < 14A Q n Independent TRACK/SS pins for each controller ramp the Internal LDO Powers Gate Drive from V or EXTV IN CC n output voltages during start-up. Current foldback limits No Current Foldback During Start-Up n MOSFET heat dissipation during short-circuit conditions. Small Low Profile (0.75mm) 5mm 5mm QFN Package n The PLLIN/MODE pin selects among Burst Mode operation, AEC-Q100 Qualified for Automotive Applications pulse-skipping mode, or continuous conduction mode at light loads. For a leaded package version (28-lead Narrow APPLICATIONS SSOP), see the LTC3890-1 data sheet. n Automotive Always-On Systems All registered trademarks and trademarks are the property of their respective owners. Protected n by U.S. Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, Battery Operated Digital Devices 6580258, 7230497. n Distributed DC Power Systems TYPICAL APPLICATION High Efficiency Dual 8.5V/3.3V Output Step-Down Converter Efficiency and Power Loss V IN vs Output Current 9V TO 60V 22F 4.7F 100 10000 V = 12V IN V INTV IN CC V = 3.3V 90 OUT TG1 TG2 1000 80 0.1F 0.1F BOOST1 BOOST2 4.7H 8H 70 SW1 SW2 60 100 BG1 BG2 50 LTC3890 PGND 40 10 + + SENSE1 SENSE2 30 0.008 0.01 20 1 V V SENSE1 SENSE2 OUT2 10 OUT1 8.5V 3.3V V V FB1 FB2 0 0.1 3A 5A 100k 100k ITH1 ITH2 0.0001 0.001 0.01 0.1 1 10 470F 1000pF 1000pF 330F OUTPUT CURRENT (A) TRACK/SS1 SGND TRACK/SS2 10.5k 3890 TA01b 31.6k 34.8k 34.8k 0.1F 0.1F 3890 TA01a Rev. D 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3890 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Input Supply Voltage (V ) ......................... 0.3V to 65V IN Topside Driver Voltages BOOST1, BOOST2 .................................0.3V to 71V Switch Voltage (SW1, SW2) ......................... 5V to 65V 32 31 30 29 28 27 26 25 SENSE1 1 24 BOOST1 (BOOST1-SW1), (BOOST2-SW2) ................ 0.3V to 6V FREQ 2 23 BG1 RUN1, RUN2 ............................................... 0.3V to 8V PHASMD 3 22 V IN Maximum Current Sourced into Pin from CLKOUT 4 21 PGND 33 Source > 8V .....................................................100A SGND PLLIN/MODE 5 20 EXTV CC + + SENSE1 , SENSE2 , SENSE1 SGND INTV 6 19 CC SENSE2 Voltages ..................................... 0.3V to 28V RUN1 7 18 BG2 PLLIN/MODE, INTV Voltages ................... 0.3V to 6V RUN2 8 17 BOOST2 CC 9 10 11 12 13 14 15 16 FREQ Voltage ........................................0.3V to INTV CC I , PHASMD Voltages .......................0.3V to INTV LIM CC EXTV ..................................................... 0.3V to 14V CC ITH1, ITH2, V , V Voltages ................... 0.3V to 6V FB1 FB2 UH PACKAGE 32-LEAD (5mm 5mm) PLASTIC QFN PGOOD1, PGOOD2 Voltages ....................... 0.3V to 6V T = 150C, = 34C/W JMAX JA TRACK/SS1, TRACK/SS2 Voltages ............. 0.3V to 6V EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB Operating Junction Temperature Range (Notes 2, 3) LTC3890E, LTC3890I ......................... 40C to 125C LTC3890H .......................................... 40C to 150C LTC3890MP ....................................... 55C to 150C Storage Temperature Range .................. 65C to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3890EUH PBF LTC3890EUH TRPBF 3890 40C to 125C 32-Lead (5mm 5mm) Plastic QFN LTC3890IUH PBF LTC3890IUH TRPBF 3890 32-Lead (5mm 5mm) Plastic QFN 40C to 125C LTC3890HUH PBF LTC3890HUH TRPBF 3890 32-Lead (5mm 5mm) Plastic QFN 40C to 150C LTC3890MPUH PBF LTC3890MPUH TRPBF 3890 32-Lead (5mm 5mm) Plastic QFN 55C to 150C AUTOMOTIVE PRODUCTS** LTC3890EUH WPBF LTC3890EUH WTRPBF 3890 32-Lead (5mm 5mm) Plastic QFN 40C to 125C LTC3890IUH WPBF LTC3890IUH WTRPBF 3890 32-Lead (5mm 5mm) Plastic QFN 40C to 125C LTC3890HUH WPBF LTC3890HUH WTRPBF 3890 32-Lead (5mm 5mm) Plastic QFN 40C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Rev. D 2 For more information www.analog.com + SENSE2 SENSE1 + SENSE2 V FB1 V ITH1 FB2 ITH2 TRACK/SS1 TRACK/SS2 I LIM PGOOD2 PGOOD1 TG2 TG1 SW2 SW1