L6712 L6712A TWO-PHASE INTERLEAVED DC/DC CONTROLLER 1 Features Figure 1. Packages 2 PHASE OPERATION WITH SYNCHRONOUS RECTIFIER CONTROL ULTRA FAST LOAD TRANSIENT RESPONSE INTEGRATED HIGH CURRENT GATE SO28 DRIVERS: UP TO 2A GATE CURRENT 3 BIT PROGRAMMABLE OUTPUT FROM 0.900V TO 3.300V OR WITH EXTERNAL REF. 0.9% OUTPUT VOLTAGE ACCURACY 3mA CAPABLE AVAILABLE REFERENCE VFQFPN-36 (6x6x1.0mm) INTEGRATED PROGRAMMABLE REMOTE SENSE AMPLIFIER PROGRAMMABLE DROOP EFFECT Table 1. Order Codes 10% ACTIVE CURRENT SHARING Package Tube Tape & Reel ACCURACY L6712D, L6712DTR, DIGITAL 2048 STEP SOFT-START SO L6712AD L6712ADTR CROWBAR LATCHED OVERVOLTAGE PROT. L6712Q, L6712QTR, VFQFPN NON-LATCHED UNDERVOLTAGE PROT. L6712AQ L6712AQTR OVERCURRENT PROTECTION REALIZED USING THE LOWER MOSFET S R OR A dsON SENSE RESISTOR optimized for high current DC/DC applications. OSCILLATOR EXTERNALLY ADJUSTABLE Output voltage can be programmed through the in- tegrated DAC from 0.900V to 3.300V program- AND INTERNALLY FIXED AT 150kHZ ming the111 code, an external reference from POWER GOOD OUTPUT AND INHIBIT 0.800V to 3.300V is used for the regulation. FUNCTION Programmable Remote Sense Amplifier avoids PACKAGES: SO-28 & VFQFPN-36 use of external resistor divider and recovers loss- es along distribution line. 1.1 Applications The device assures a fast protection against load over current and Over / Under voltage.An internal HIGH CURRENT DC/DC CONVERTERS crowbar is provided turning on the low side mosfet DISTRIBUTED POWER SUPPLY if Over-voltage is detected. Output current is limited working in Constant Cur- rent mode: when Under Voltage is detected, the 2 Description device resets, restarting operation. The device implements a dual-phase step-down con- troller with a 180 phase-shift between each phase Rev. 3 June 2005 1/29L6712A L6712 Figure 2. Block Diagram OSOSCC / / ININHH SSGGNNDD VVCCCCDRDR BOBOOOTT11 BABANNDD--GGAAP P HSHS REREFFEERERENCNCEE UGUGAATTEE11 PWPWMM11 PPGOODGOOD PHPHAASE1SE1 CH1CH1 VCVCCC LSLS LGLGAATTEE11 OCOCPP LLOGIOGIC AC ANNDD VIVIDD22 VVCCCDRCDR PROTECTPROTECTIIONSONS ISISENEN11 VIVIDD11 DACDAC VIVIDD00 TOTOTATALL CUCURRRREENNTT PGNPGNDDSS11 CUCURRERRENTNT READINGREADING CH1CH1 O OCCPP CHCH22 OC OCPP PGNPGNDD PGNPGNDDSS22 CURRENT CURRENT DIGDIGIITTAALL SOSOFTFT--SSTTAARRTT REREAADDIINNGG ISISENEN22 VV PRPROOGG LSLS LGLGAATTEE22 CH2CH2 REREFF IINN//OOUUTT OCOCPP FBFBGG PHPHAASE2SE2 PWPWMM22 FBFBRR HSHS UGUGAATTEE22 REREMMOOTTEE VccVcc AMAMPLPLIFIFIIEERR ERROERROR R BOBOOOTT22 AMAMPLPLIFIIFIEERR VVSENSEN DDRROOPOOP FBFB COCOMMPP VcVccc Table 2. Absolute Maximum Ratings Symbol Parameter Value Unit V , V To PGND 15 V CC CCDR V -V Boot Voltage 15 V BOOT PHASE V -V 15 V UGATE1 PHASE1 V -V UGATE2 PHASE2 LGATE1, PHASE1, LGATE2, PHASE2 to PGND -0.3 to Vcc+0.3 V VID0 to VID2 -0.3 to 5 V All other pins to PGND -0.3 to 7 V V Sustainable Peak Voltage. T<20ns 600kHz 26 V PHASEx UGATEX Pins Maximum Withstanding Voltage Range 1500 V Test Condition: CDF-AEC-Q100-002Human Body Model OTHER PINS 2000 V Acceptance Criteria: Normal Performance Table 3. Thermal Data Symbol Parameter SO28 VFQFPN36 Unit R Thermal Resistance Junction to Ambient 60 30 C/W thj-amb 4 layer PCB (2s2p) T Maximum junction temperature 150 150 C max T Storage temperature range -40 to 150 -40 to 150 C stg T Junction Temperature Range -40 to 125 -40 to 125 C j P Max power dissipation at T = 25C 23.5 W MAX amb 2/29 II FBFB SSTATARRTT II DRDROOOOPP 2 P2 PHHASASE E OSOSCCIILLLLAATTOORR CUCURRRREENNTT AVAVGG CCUURRERRENNTT CUCURRRREENNTT COCORRRREECCTTIIOONN COCORRRREECCTTIIOONN LOLOGGIICC P PWWMM LOLOGGIICC P PWWMM ADAADAPPTITIVE AVE ANNTITI ADAADAPPTTIIVE ANTIVE ANTI CRCROOSSS CONDUCTS CONDUCTION ION CROSS CONDUCTCROSS CONDUCTION ION