POWER LOSS (mW) LTC7801 150V Low I , Synchronous Q Step-Down DC/DC Controller FEATURES DESCRIPTION n Wide V Range: 4V to 140V (150V Abs Max) The LTC 7801 is a high performance step-down switching IN n Wide Output Voltage Range: 0.8V to 60V regulator DC/DC controller that drives an all N-channel n Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE) synchronous power MOSFET stage that can operate from n Low Operating I : 40A (Shutdown = 10A) input voltages up to 140V. A constant frequency current Q n 100% Duty Cycle Operation mode architecture allows a phase-lockable frequency of n Integrated Bootstrap Diode up to 850kHz. n Selectable Gate Drive UVLO Thresholds The gate drive voltage can be programmed from 5V n Onboard LDO or External NMOS LDO for DRV CC to 10V to allow the use of logic or standard-level FETs n EXTV LDO Powers Drivers from V CC OUT to maximize efficiency. An integrated switch in the top n Phase-Lockable Frequency (75kHz to 850kHz) gate driver eliminates the need for an external bootstrap n Programmable Fixed Frequency (50kHz to 900kHz) diode. An internal charge pump allows for 100% duty n Selectable Continuous, Pulse-Skipping or Low Ripple cycle operation. Burst Mode Operation at Light Loads n The low 40A no-load quiescent current extends operat- Adjustable Burst Clamp n ing run time in battery-powered systems. OPTI-LOOP Power Good Output Voltage Monitor n compensation allows the transient response to be opti- Programmable Input Overvoltage Lockout n mized over a wide range of output capacitance and ESR Small 24-Lead 4mm 5mm QFN or TSSOP Packages values. The LTC7801 features a precision 0.8V refer- ence and power good output indicator. The output volt- APPLICATIONS age can be programmed between 0.8V to 60V using n Automotive and Industrial Power Systems externalresistors. n High Voltage Battery Operated Systems All registered trademarks and trademarks are the property of their respective owners. Protected n Telecommunications Power Systems by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. TYPICAL APPLICATION High Efficiency High Voltage 12V Output Step-Down Regulator Efficiency and Power Loss vs Load Current V IN 7V to 140V 100 10k 100F V RUN IN 90 NDRV TG EFFICIENCY 0.1F *V FOLLOWS V WHEN V < 12V OUT IN IN 80 DRV CC 1k BOOST 6m 33H 4.7F V 70 OUT LTC7801 12V* 60 SW 5A INTV CC 50 100 BG V = 24V IN 150F 0.1F CPUMP EN POWER LOSS x3 40 V = 48V IN SENSE+ 30 ITH 1nF 10 SENSE 20 SS 10k 0.1F EXTV CC 10 100pF 511k FREQ 0 1 V FB 30.1k 0.0001 0.001 0.01 0.1 1 10 4.7nF 36.5k GND LOAD CURRENT (A) 7801 TA01b 7801 TA01a Rev. A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC7801 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage (V ) ....................... 0.3V to 150V DRVSET, CPUMP EN Voltages ..................... 0.3V to 6V IN Top Side Driver Voltage BOOST ............... 0.3V to 150V NDRV ................................................................. (Note 9) Switch Voltage (SW) ................................... 5V to 150V EXTV Voltage ......................................... 0.3V to 14V CC DRV , (BOOST-SW) Voltages ....................0.3V to 11V ITH, V Voltages ......................................... 0.3V to 6V CC FB BG, TG ............................................................... (Note 8) SS, OVLO Voltages ...................................... 0.3V to 6V RUN Voltage............................................. 0.3V to 150V Operating Junction Temperature Range (Notes 2, 3) + SENSE , SENSE Voltages ......................... 0.3V to 65V LTC7801E, LTC7801I .......................... 40C to 125C PLLIN, PGOOD Voltages .............................. 0.3V to 6V LTC7801H .......................................... 40C to 150C MODE, DRVUV Voltages .............................. 0.3V to 6V Storage Temperature Range .................. 65C to 150C FREQ Voltage ............................................... 0.3V to 6V PIN CONFIGURATION TOP VIEW TOP VIEW + 1 24 SENSE SENSE 2 23 OVLO SS 3 22 INTV V 24 23 22 21 20 FB CC V 1 19 RUN FB 4 21 RUN ITH ITH 2 18 EXTV CC 5 20 EXTV MODE CC MODE 3 17 V IN 6 V GND 19 IN 25 GND 4 25 16 NDRV 7 NDRV CRUMP EN 18 CPUMP EN 5 15 DRV CC 8 DRV PLLIN 17 CC PLLIN 6 14 BG 9 BG PGOOD 16 PGOOD 7 13 BOOST FREQ 10 15 BOOST 8 9 10 11 12 DRVSET 11 14 SW DRVUV 12 13 TG UFD PACKAGE FE PACKAGE 24-LEAD (4mm 5mm) PLASTIC QFN 24-LEAD PLASTIC TSSOP T = 150C, = 43C/W JMAX JA T = 150C, = 33C/W JMAX JA EXPOSED PAD (PIN 25) IS GND, MUST BE EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB FOR RATED ELECTRICAL AND SOLDERED TO PCB FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS THERMAL CHARACTERISTICS ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC7801EFE PBF LTC7801EFE TRPBF LTC7801FE 24-Lead Plastic TSSOP 40C to 125C LTC7801IFE PBF LTC7801IFE TRPBF LTC7801FE 24-Lead Plastic TSSOP 40C to 125C LTC7801HFE PBF LTC7801HFE TRPBF LTC7801FE 24-Lead Plastic TSSOP 40C to 150C LTC7801EUFD PBF LTC7801EUFD TRPBF 7801 24-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC7801IUFD PBF LTC7801IUFD TRPBF 7801 24-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC7801HUFD PBF LTC7801HUFD TRPBF 7801 24-Lead (4mm 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. Rev. A 2 For more information www.analog.com FREQ SS DRVSET SENSE + DRVUV SENSE TG OVLO SW INTV CC