POWER LOSS (W) LT3782A 2-Phase Step-Up DC/DC Controller Fea T Descrip T n 2-Phase Operation Reduces Required Input and The LT 3782A is a current mode 2-phase step-up DC/DC Output Capacitance converter controller. Its high switching frequency (up to n Programmable Switching Frequency: 500kHz) and 2-phase operation reduce system filtering 150kHz to 500kHz capacitance and inductance requirements. n 6V to 40V Input Range With 10V gate drive (V 13V) and 4A peak drive current, CC n 10V Gate Drive with V 13V CC the LT3782A can drive most industrial grade high power n High Current Gate Drive (4A) MOSFETs with high efficiency. For synchronous applica- n Programmable Soft-Start and Current Limit tions, the LT3782A provides synchronous gate signals n Programmable Slope Compensation for with programmable falling edge delay to avoid cross High Noise Immunity conduction when using external MOSFET drivers. Other n MOSFET Gate Signals with Programmable features include programmable undervoltage lockout, Falling Edge Delay for External Synchronous Drivers soft-start, current limit, duty cycle clamp (50% or higher) n Programmable Undervoltage Lockout and slope compensation. The LT3782A is identical to the n Programmable Duty Cycle Clamp (50% or Higher) LT3782 except that the LT3782A has a tighter current n Thermally Enhanced 28-Lead TSSOP and 4mm sense mismatch tolerance. 5mm QFN Packages The LT3782A is available in thermally enhanced 28-lead a T TSSOP and 4mm 5mm QFN packages. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks, ThinSOT n Industrial Equipment and No R are trademarks of Linear Technology Corporation. All other trademarks are the SENSE n property of their respective owners. Protected by U.S. Patents including 6144194. Telecom Infrastructure n Interleaved Isolated Power Supply Typical a T 50V 4A Boost Converter Efficiency and Power Loss vs Load Current 20H V V IN OUT 10V TO 36V 50V, 4A 97 18 20H 10F D1 V GBIAS1 CC 2 V = 24V IN EFFICIENCY 10F + 1F GBIAS2 2F 95 15 2 D2 220F 825k V = 12V GBIAS IN Q1 BGATE1 93 12 RUN 274k V = 12V IN LT3782A 0.004 91 9 V EE1 V = 24V IN 59k 89 6 SLOPE BGATE2 Q2 POWER LOSS DELAY 87 3 80k DCL 0.004 475k R 85 0 SET V EE2 0 1 2 3 4 5 10 10 SS I (A) OUT 24.9k + 0.1F SENSE1 3782A TA01b 10nF 10nF SENSE1 V C + SENSE2 13k D1, D2: 30BQ060PbF SENSE2 100pF 6.8nF Q1, Q2: Si7852DP-T1-E3 FB GND 3782A TA01 3782afc 1 For more information www.linear.com/LT3782A EFFICIENCY (%) ion pplica ions pplica ion uresLT3782A a T e Maxi Mu M r a T (Note 1) V Supply Voltage ...................................................40V SS ........................................................... 300A Max I CC SS + + GBIAS, GBIAS1, GBIAS2 Pin SENSE1 , SENSE2 , (Externally Forced)....................................................14V SENSE1 , SENSE2 ..................................... 0.3V to 2V SYNC, RUN Pin .........................................................30V Storage Temperature Range ..................65C to 150C Operating Junction Temperature Lead Temperature (Soldering, 10 sec) Range (Notes 2, 3) ................................. 40C to 125C For FE Package .....................................................300C p c F T TOP VIEW TOP VIEW 1 28 GBIAS SGATE2 2 27 V SGATE1 CC 3 26 NC NC 28 27 26 25 24 23 4 25 NC GND SYNC 1 22 BGATE1 5 24 V DELAY 2 21 GBIAS1 SYNC EE1 DCL 3 20 NC 6 BGATE1 DELAY 23 + SENSE1 4 19 NC 7 GBIAS1 29 DCL 22 29 GND + GND SENSE1 5 18 GBIAS2 8 GBIAS2 SENSE1 21 SLOPE 6 17 BGATE2 SENSE1 9 20 BGATE2 R 7 16 V SET EE2 SLOPE 10 19 V EE2 8 SENSE2 15 NC R 11 18 NC SET 9 10 11 12 13 14 SENSE2 12 17 RUN + SENSE2 13 16 FB SS 14 15 V C UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN FE PACKAGE T = 125C, = 37C/ W 28-LEAD PLASTIC TSSOP JMAX JA EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB T = 125C, = 30C/ W JMAX JA EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3782AEFE PBF LT3782AEFE TRPBF LT3782AFE 28-Lead Plastic TSSOP 40C to 125C LT3782AIFE PBF LT3782AIFE TRPBF LT3782AFE 28-Lead Plastic TSSOP 40C to 125C LT3782AEUFD PBF LT3782AEUFD TRPBF 3782A 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3782AIUFD PBF LT3782AIUFD TRPBF 3782A 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3782AEFE LT3782AEFE TR LT3782AFE 28-Lead Plastic TSSOP 40C to 125C LT3782AIFE LT3782AIFE TR LT3782AFE 28-Lead Plastic TSSOP 40C to 125C LT3782AEUFD LT3782AEUFD TR 3782A 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LT3782AIUFD LT3782AIUFD TR 3782A 28-Lead (4mm 5mm) Plastic QFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: