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LTC3827 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3827 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC3827 1 3827ff TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Low IQ, Dual, 2-Phase Synchronous Step-Down Controller The LTC®3827 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable fre- quency of up to 650kHz. Power loss and noise due to the ESR of the input capacitor ESR are minimized by operating the two controller output stages out of phase. The 80μA no-load quiescent current extends operating life in battery-powered systems. OPTI-LOOP compensa- tion allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3827 features a precision 0.8V reference and a power good output indicator. A wide 4V to 36V input supply range encompasses all battery chemistries. Independent TRACK/SS pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode opera- tion, pulse skipping mode, or continuous inductor cur- rent mode at light loads. For a leaded package version (28-lead SSOP), see the LTC3827-1 datasheet. High Efficiency Dual 8.5V/3.3V Step-Down Converter n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V n Low Operating IQ: 80μA (One Channel On) n Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n OPTI-LOOP® Compensation Minimizes COUT n ±1% Output Voltage Accuracy n Wide VIN Range: 4V to 36V Operation n Phase-Lockable Fixed Frequency 140kHz to 650kHz n Selectable Continuous, Pulse Skipping or Low Ripple Burst Mode® Operation at Light Loads n Dual N-Channel MOSFET Synchronous Drive n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Output Current Foldback Limiting n Power Good Output Voltage Monitor n Output Overvoltage Protection n Low Shutdown IQ: 8μA n Internal LDO Powers Gate Drive from VIN or VOUT n Small 5mm × 5mm QFN Package n Automotive Systems n Battery-Operated Digital Devices n Distributed DC Power Systems L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode 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 5481178, 5929620, 6177787, 6144194, 5408150, 6580258, 6304066, 570919. Efficiency and Power Loss vs Load Current + 4.7μF 0.1μF 62.5k 3.3μH 220pF 150μF 1μF 22μF 50V 0.015Ω 20k 15k VOUT1 3.3V 5A 150μF 0.1μF 192.5k 7.2μH 220pF 0.015Ω 20k 15k VOUT2 8.5V 3.5A TG1 TG2 BOOST1 BOOST2 SW1 SW2 BG1 BG2 SGND PGND SENSE1+ SENSE2+ SENSE1– SENSE2– VFB1 VFB2 ITH1 ITH2 VIN INTVCC TRACK/SS1 TRACK/SS2 VIN 4V TO 36V 3827 TA01 0.1μF 0.1μF LTC3827 LOAD CURRENT (mA) 0.01 0.1 1 10 100 1000 10000 3827 TA01b 0.001 1 10 1000 100 0.1 100000 10000 40 50 60 70 80 30 20 10 0 90 100 POWER LOSS EFFICIENCY VIN = 12V; VOUT = 3.3V FIGURE 13 CIRCUIT |
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