POWER LOSS (mW) LTC3834-1 30 A I Synchronous Q Step-Down Controller FEATURES DESCRIPTIO Wide Output Voltage Range: 0.8V V 10V The LTC 3834-1 is a high performance step-down switch- OUT Low Operating I : 30A ing regulator controller that drives an all N-channel syn- Q OPTI-LOOP Compensation Minimizes C chronous power MOSFET stage. A constant-frequency OUT 1% Output Voltage Accuracy current mode architecture allows a phase-lockable fre- Wide V Range: 4V to 36V quency of up to 650kHz. IN Phase-Lockable Fixed Frequency 140kHz to 650kHz The 30A no-load quiescent current extends operating Dual N-Channel MOSFET Synchronous Drive life in battery powered systems. OPTI-LOOP compen- Very Low Dropout Operation: 99% Duty Cycle sation allows the transient response to be optimized over Adjustable Output Voltage Soft-Start or Tracking a wide range of output capacitance and ESR values. The Output Current Foldback Limiting LTC3834-1 features a precision 0.8V reference . The 4V to Output Overvoltage Protection 36V input supply range encompasses a wide range of bat- Low Shutdown I : 4A Q tery chemistries. Selectable Continuous, Pulse-Skipping or The TRACK/SS pin ramps the output voltage during start- Burst Mode Operation at Light Loads up. Current foldback limits MOSFET heat dissipation Small 16-Lead Narrow SSOP or 5mm 3mm during short-circuit conditions. An enhanced feature set DFN Package part (LTC3834) is available. U Comparison of LTC3834 and LTC3834-1 APPLICATIO S CLKOUT/ Automotive Systems PART PHASMD EXTV PGOOD PACKAGES CC Telecom Systems LTC3834 YES YES YES FE20/4 5 QFN Battery-Operated Digital Devices LTC3834-1 NO NO NO GN16/3 5 DFN Distributed DC Power Systems , LT, LTC, LTM, Burst Mode, PolyPhase and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5408150, 5481178, 5705919, 5929620, 6304066, 6498466, 6580258, 6611131. TYPICAL APPLICATIO Efficiency and Power Loss High Efficiency Step-Down Converter vs Load Current 10000 100 PLLLPF V IN V IN 90 4V TO 36V 10F RUN TG 0.01F 1000 80 0.22F TRACK/SS 70 BOOST 3.3H 0.012 V OUT I TH SW 3.3V 100 60 560pF LTC3834-1 5A 50 150pF 54.2k 10 40 SGND INTV CC 150F 4.7F PLLIN/MODE 30 68.1k V BG FB 20 1 SENSE 215k 10 + SENSE PGND 0 0.1 0.000001 0.0001 0.01 1 OUTPUT CURRENT (A) 38341 TA01 38341 TA01b 38341f 1 EFFICIENCY (%) U ULTC3834-1 ABSOLUTE AXI U RATI GS (Note 1) Input Supply Voltage (V ).........................36V to 0.3V Peak Output Current <10s (TG, BG)......................... 3A IN Top Side Driver Voltage (BOOST) ..............42V to 0.3V INTV Peak Output Current ................................ 50mA CC Switch Voltage (SW) ....................................36V to 5V Operating Temperature Range (Note 2) .. 40C to 85C INTV (BOOST-SW).................................8.5V to 0.3V Junction Temperature (Note 3)............................. 125C CC, RUN, TRACK/SS ......................................... 7V to 0.3V Storage Temperature Range ................. 65C to 150C + SENSE , SENSE Voltages.........................11V to 0.3V Lead Temperature PLLIN/MODE, PLLLPF ......................... INTV to 0.3V (GN Package, Soldering, 10 sec) ...................... 300C CC I V Voltages .......................................2.7V to 0.3V TH, FB PI CO FIGURATIO TOP VIEW TOP VIEW PLLLPF 1 16 PLLIN/MODE PLLLPF 1 16 PLLIN/MODE + + I 2 15 SENSE I 2 15 SENSE TH TH TRACK/SS 3 14 SENSE TRACK/SS 3 14 SENSE V 4 13 RUN V 4 13 RUN FB FB 17 SGND 5 12 BOOST SGND 5 12 BOOST PGND 6 11 TG PGND 6 11 TG BG 7 10 SW BG 7 10 SW INTV 8 9 V INTV 8 9 V CC IN CC IN GN PACKAGE DHC PACKAGE 16-LEAD PLASTIC SSOP 16-Pin (5mm 3mm) PLASTIC DFN T = 150C, = 90C/W JMAX JA T = 125C, = 43.5C/W JMAX JA EXPOSED PAD (PIN 17) IS SGND MUST BE SOLDERED TO PCB UUW ORDER I FOR ATIO LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3834EDHC-1 PBF LTC3834EDHC-1 TRPBF 38341 16-Lead (5mm 3mm) Plastic DFN 40C to 85C (Note 2) LTC3834IDHC-1 PBF LTC3834IDHC-1 TRPBF 38341 16-Lead (5mm 3mm) Plastic DFN 40C to 85C LTC3834EGN-1 PBF LTC3834EGN-1 TRPBF 38341 16-Lead Plastic SSOP 40C to 85C (Note 2) LTC3834IGN-1 PBF LTC3834IGN-1 TRPBF 38341 16-Lead Plastic SSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: