LTC3376 20V, 4-Channel Buck DC/DC with 8x Configurable 1.5A Power Stages FEATURESDESCRIPTION n Wide VIN Range: 3V to 20V The LTC®3376 is a highly flexible multioutput power n Wide VOUT Range: 0.4V to 0.83 • VIN supply IC. The device includes four synchronous buck n 8× 1.5A Buck Power Stages Configurable as 1 to 4 converters, configured to share eight 1.5A power stages, Output Channels powered from independent 3V to 20V inputs. The DC/DCs n 15 Unique Pin Selectable Output Configurations are assigned to one of fifteen power configurations via pin (1.5A to 12A per Channel) strappable CFG0 to CFG3 pins. The LTC3376 includes the n Internal Boost Capacitors for Reduced PCB Space integration of ceramic capacitors into the package for the n No Load I BST pins thereby saving PCB space. The common buck Q 27µA 1 Buck Enabled; 42µA All BucksEnabled switching frequency may be programmed with an external n 1% V resistor, synchronized to an external oscillator, or set to a OUT Accuracy on All Channels n Peak Current Mode Control (Burst Mode® default internal 2MHz clock. Operation/Forced Continuous) The operating mode for all DC/DCs may be programmed n Precision RUN Inputs, Individual PGOOD Outputs for via the SYNC/MODE pin for Burst Mode or forced continu- Power Sequencing ous mode operation. The PGOOD1 to PGOOD4 outputs n 1MHz to 3MHz Frequency (RT Programmable, PLL indicate when each enabled DC/DC is within a specified SYNC, or Internal 2MHz Oscillator) percentage of its final output. n TEMP Pin Output Indicates Die Temperature n Current monitors allow for external monitoring of each Output Current Monitors n buck’s load. The EXTVCC pin allows for the internal cir- Differential Output Sense cuitry to run from a 3V to 5.5V rail for improved efficiency. APPLICATIONS Precision RUN pin thresholds facilitate power-up sequenc- ing. The LTC3376 is available in a 64 lead 7mm × 7mm n Telecom/Industrial BGA (0.8mm ball pitch). n 12V Distributed Power Systems All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION1.5A Buck Efficiency vs ILOAD, 2 1.5A Buck Efficiency vs ILOAD, VOUT=5V RUN1 VINA/B 3V TO 20V VOUT = 5V BSTA 100 PGOOD1 BSTB I 90 MON1 2 SWA/B 0.4V TO 5.5V 80 2 Burst Mode L = 5.6µH PGNDA/B 70 OPERATION L DCR = 12mΩ FB1+ 60 fOSC = 1MHz FB1– EXTV LTC3376 50 CC = 3.3V BUCK 1 (3A) V BUCK 2 (3A) IN = 8V 40 VIN = 12V BUCK 3 (3A) EFFICIENCY (%) V 30 IN = 20V BUCK 4 (3A) VIN = 8V 3V TO 20V V 20 V CC INTVCC_P (3V) IN = 12V INTV V CC IN = 20V 10 FORCED CONTINUOUS MODE 3V TO 5.5V EXTVCC 0 (OPTIONAL) SYNC/MODE TEMP 1m 10m 100m 1 2 CFG[3:0] RT LOAD CURRENT (A) GND 3376 G23 3376 TA01a Rev 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts
