LTC3834-1 30μA IQ Synchronous Step-Down Controller UFEATURESDESCRIPTIO ■ Wide Output Voltage Range: 0.8V V OUT 10V The LTC®3834-1 is a high performance step-down switch- ■ Low Operating IQ: 30μA ing regulator controller that drives an all N-channel syn- ■ OPTI-LOOP® Compensation Minimizes COUT chronous power MOSFET stage. A constant-frequency ■ ±1% Output Voltage Accuracy current mode architecture allows a phase-lockable fre- ■ Wide VIN Range: 4V to 36V quency of up to 650kHz. ■ Phase-Lockable Fixed Frequency 140kHz to 650kHz The 30μA 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 IQ: 4μA tery chemistries. ■ Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads The TRACK/SS pin ramps the output voltage during start- ■ Small 16-Lead Narrow SSOP or 5mm × 3mm up. Current foldback limits MOSFET heat dissipation DFN Package during short-circuit conditions. An enhanced feature set part (LTC3834) is available. UComparison of LTC3834 and LTC3834-1APPLICATIO SCLKOUT/ ■ Automotive Systems PART #PHASMDEXTVCCPGOODPACKAGES ■ 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. UTYPICAL APPLICATIOEfficiency and Power LossHigh Efficiency Step-Down Convertervs Load Current 100 10000 PLLLPF VIN VIN 90 4V TO 36V 10μF 0.01μF RUN TG 80 1000 TRACK/SS 0.22μF POWER LOSS (mW) BOOST 70 3.3μH 0.012Ω VOUT ITH SW 3.3V 560pF 60 100 LTC3834-1 5A 50 150pF 54.2k SGND INTV 40 10 CC 150μF EFFICIENCY (%) 4.7μF 68.1k PLLIN/MODE 30 VFB BG 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
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