POWER LOSS (mW) LTC3895 150V Low I , Synchronous Q Step-Down DC/DC Controller Fea T Descrip T n Wide V Range: 4V to 140V (150V Abs Max) The LTC 3895 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 No External Bootstrap Diode Required up to 850kHz. n Selectable Gate Drive UVLO Thresholds The gate drive voltage can be programmed from 5V to 10V n Onboard LDO or External NMOS LDO for DRV CC to allow the use of logic or standard-level FETs to maxi- n EXTV LDO Powers Drivers from V CC OUT mize efficiency. An integrated switch in the top gate driver n Phase-Lockable Frequency (75kHz to 850kHz) eliminates the need for an external bootstrap diode. An n Programmable Fixed Frequency (50kHz to 900kHz) internal charge pump allows for 100% duty cycle operation. n Selectable Continuous, Pulse-Skipping or Low Ripple The low 40A no-load quiescent current extends operating Burst Mode Operation at Light Loads n run time in battery-powered systems. OPTI-LOOP com- Adjustable Burst Clamp and Current Limit n pensation allows the transient response to be optimized Adjustable or Fixed (5V/3.3V) Output Voltage n over a wide range of output capacitance and ESR values. Power Good Output Voltage Monitor n The LTC3895 features a precision 0.8V reference and Programmable Input Overvoltage Lockout n power good output indicator. The output voltage can be 38-Lead TSSOP High Voltage Package programmed between 0.8V to 60V using external resistors or pin-programmed for a fixed 5V or 3.3V. a T L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo n Automotive and Industrial Power Systems are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, n High Voltage Battery Operated Systems 5929620, 6144194, 6177787, 6580258. n Telecommunications Power Systems Typical a T 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 LTC3895 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) 3895 TA01b 3895fa 1 For more information www.linear.com/LTC3895 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3895 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW Input Supply Voltage (V ) ....................... 0.3V to 150V IN OVLO 1 38 INTV CC Top Side Driver Voltage BOOST ............... 0.3V to 150V VPRG 2 37 ILIM Switch Voltage (SW) ................................... 5V to 150V + SENSE 3 36 PHASMD DRV , (BOOST-SW) Voltages ....................0.3V to 11V CC SENSE 4 BG, TG ............................................................... (Note 8) SS 5 34 RUN RUN Voltage............................................. 0.3V to 150V V 6 FB + SENSE , SENSE Voltages ......................... 0.3V to 65V ITH 7 32 EXTV CC PLLIN, PGOOD Voltages .............................. 0.3V to 6V MODE 8 MODE, DRVUV Voltages .............................. 0.3V to 6V GND 9 30 V IN ILIM, VPRG, FREQ, PHASMD Voltages ........ 0.3V to 6V CPUMP EN 10 39 GND DRVSET, CPUMP EN Voltages ..................... 0.3V to 6V CLKOUT 11 28 NDRV GND 12 NDRV ................................................................. (Note 9) PLLIN 13 26 DRV CC EXTV Voltage ......................................... 0.3V to 14V CC PGOOD 14 ITH, V Voltages ......................................... 0.3V to 6V FB GND 15 24 BG SS, OVLO Voltages ...................................... 0.3V to 6V NC 16 Operating Junction Temperature Range (Notes 2, 3) FREQ 17 22 BOOST LTC3895E, LTC3895I ......................... 40C to 125C DRVSET 18 21 SW LTC3895H .......................................... 40C to 150C DRVUV 19 20 TG Storage Temperature Range .................. 65C to 150C FE PACKAGE VARIATION: FE38(31) 38-LEAD PLASTIC TSSOP T = 150C, = 28C/W JMAX JA EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS o r Der i n F Ma T