POWER LOSS (W) LTC3789 High Efficiency, Synchronous, 4-Switch Buck-Boost Controller Fea T Descrip T n Single Inductor Architecture Allows V Above, The LTC 3789 is a high performance buck-boost switch- IN Below or Equal to the Regulated V ing regulator controller that operates from input volt- OUT n Programmable Input or Output Current ages above, below or equal to the output voltage. The n Wide V Range: 4V to 38V constant-frequency, current mode architecture allows IN n 1% Output Voltage Accuracy: 0.8V < V < 38V a phase-lockable frequency of up to 600kHz, while an OUT n Synchronous Rectification: Up to 98% Efficiency output current feedback loop provides support for battery n Current Mode Control charging. With a wide 4V to 38V (40V maximum) input and n Phase-Lockable Fixed Frequency: 200kHz to 600kHz output range and seamless, low noise transitions between n No Reverse Current During Start-Up operating regions, the LTC3789 is ideal for automotive, n Power Good Output Voltage Monitor telecom and battery-powered systems. n Internal 5.5V LDO The operating mode of the controller is determined through n Quad N-Channel MOSFET Synchronous Drive the MODE/PLLIN pin. The MODE/PLLIN pin can select n V Disconnected from V During Shutdown OUT IN between pulse-skipping mode and forced continuous n True Soft-Start and V Short Protection, Even in OUT mode operation and allows the IC to be synchronized to an Boost Mode external clock. Pulse-skipping mode offers high efficiency n Available in 28-Lead QFN (4mm 5mm) and and low ripple at light loads, while forced continuous 28-Lead SSOP Packages mode operates at a constant frequency for noise-sensitive applications. a T A PGOOD pin indicates when the output is within 10% of n Automotive Systems its designed set point. The LTC3789 is available in low pro- n Distributed DC Power Systems file 28-pin 4mm 5mm QFN and narrow SSOP packages. n High Power Battery-Operated Devices L, LT, LTC, LTM, Linear Technology, the Linear logo, Module and Burst Mode are registered n Industrial Control trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5408150, 5481178, 5929620, 6580258, 7365525, 7394231. Typical a T + 1F 4.7F CER 100 Efficiency and Power Loss I INTV I LIM CC OSENSE 100 2.2F + PGOOD I V OSENSE 0.010 V 100 12 IN OUT EXTV 4V TO V IN CC 12V 38V V V 5A INSNS OUTSNS 10F + 22F 95 10 330F 16V 50V A D TG1 TG2 16V CER CER LTC3789 0.1F 0.1F 90 8 BOOST1 BOOST2 SW1 SW2 85 6 B BG1 BG2 C I TH MODE/PLLIN 2200pF SS ON/OFF 80 4 RUN 105k, 1% 8k V FB 0.01F 1000pF FREQ 7.5k 75 2 SGND V = 12V 1% OUT 121k + I = 5A SENSE SENSE PGND LOAD 70 0 0 5 10 15 20 25 30 35 40 V (V) IN 0.010 3789 TA01b 4.7H 3789 TA01 3789fc 1 For more information www.linear.com/LTC3789 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3789 a T e Maxi Mu M r a T (Note 1) Input Supply Voltage (V ) ......................... 40V to 0.3V V , V ........................................ 40V to 0.3V IN INSNS OUTSNS Topside Driver Voltages TG1, TG2, BG1, BG2 Voltages ........................... (Note 6) (BOOST1, BOOST2)................................... 46V to 0.3V I , FREQ, I Voltages .......................INTV to 0.3V TH LIM CC Switch Voltage (SW1, SW2) .......................... 40V to 5V V Voltage ............................................... 2.7V to 0.3V FB + Current Sense Voltages (I , I ).. 40V to 0.3V RUN, PGOOD Voltage .................................. 6V to 0.3V OSENSE OSENSE BOOST1, BOOST2 SW1, SW2 ................... 6V to 0.3V Operating Junction Temperature Range TG1, TG2 SW1, SW2 ................................. 6V to 0.3V (Notes 2, 3) ............................................ 40C to 125C EXTV Voltage ......................................... 14V to 0.3V Storage Temperature Range .................. 65C to 125C CC INTV Voltage ............................................ 6V to 0.3V INTV Peak Output Current ................................100mA CC CC + SENSE , SENSE Voltages ....................INTV to 0.3V Lead Temperature (Soldering, 10 sec.) CC MODE/PLLIN, SS Voltages ...................INTV to 0.3V GN Package ......................................................300C CC p c F T TOP VIEW TOP VIEW 1 PGOOD V 28 FB 2 SW1 SS 27 + 3 TG1 SENSE 26 28 27 26 25 24 23 4 BOOST1 SENSE 1 22 BOOST1 SENSE 25 I 2 21 PGND 5 PGND TH I 24 TH SGND 3 20 BG1 6 BG1 SGND 23 29 MODE/PLLIN 4 19 V IN 7 V MODE/PLLIN 22 IN SGND FREQ 5 18 INTV CC 8 INTV FREQ 21 CC RUN 6 17 EXTV CC 9 EXTV RUN 20 CC V 7 16 BG2 INSNS 10 BG2 V 19 INSNS V 8 15 BOOST2 OUTSNS 11 BOOST2 V 18 OUTSNS 9 10 11 12 13 14 12 TG2 I 17 LIM + 13 SW2 I 16 OSENSE 14 TRIM I 15 OSENSE UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN GN PACKAGE 28-LEAD NARROW PLASTIC SSOP T = 125C, = 34C/W JMAX JA EXPOSED PAD (PIN 29) IS SGND, MUST BE SOLDERED TO PCB T = 125C, = 80C/W JMAX JA D F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3789EGN PBF LTC3789EGN TRPBF LTC3789 28-Lead Narrow Plastic SSOP 40C to 125C LTC3789IGN PBF LTC3789IGN TRPBF LTC3789 28-Lead Narrow Plastic SSOP 40C to 125C LTC3789EUFD PBF LTC3789EUFD TRPBF 3789 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3789IUFD PBF LTC3789IUFD TRPBF 3789 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. 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