Hot-selling and scarce LTC3728LXCUH-TRPBF Dual, 550kHz, 2-Phase Synchronous Regulators 32QFN spot stock

Product Descriptions

The LTC3728L/LTC3728LX are dual high performancestep-down switching regulator controllers that drive allN‑channel synchronous power MOSFET stages .A constantfrequency,current mode architecture allows phase-lockablefrequency of up to 550kHz . Power loss and noise due tothe ESR of the input capacitors are minimized by operatingthe two controller output stages out of phase .

OPTI-LOOP compensation allows the transient response tobe optimized over a wide range of output capacitance andESR values.The precision 0.8V reference and power goodoutput indicator are compatible with future microprocessor generations,and a wide 4.5V to 28V (30V maximum)input supply range encompasses all battery chemistries .

A  RUN/SS pin for each controller provides both softstart and optional timed, short-circuit shutdown . Currentfoldback limits MOSFET dissipation during short-circuitconditions when overcurrent latchoff is disabled . Outputovervoltage protection circuitry latches on the bottomMOSFET until V OUT returns to normal . The FCB modepin can select among Burst Mode, constant-frequencymode and continuous inductor current mode or regulatea secondary winding . The LTC3728L/LTC3728LX includea power good output pin that indicates when both outputsare within 7.5% of their designed set point .

Product Features

n Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise

n OPTI-LOOP®  Compensation Minimizes C OUT

n ±1% Output Voltage Accuracy (LTC3728LC)

n Power Good Output Voltage Indicator

n Phase-Lockable Fixed Frequency 250kHz to 550kHz

n Dual N-Channel MOSFET Synchronous Drive

n Wide V IN Range: 4.5V to 28V Operation

n Very Low Dropout Operation: 99% Duty Cycle

n Adjustable Soft-Start Current Ramping

n Foldback Output Current Limiting

n Latched Short-Circuit Shutdown with Defeat Option

n Output Overvoltage Protection

n Low Shutdown IQ: 20µA

n 5V and 3 .3V Standby Regulators

n 3 Selectable Operating Modes: Constant-Frequency,Burst Mode®  Operation and PWM

n 5mm × 5mm QFN and 28-Lead Narrow SSOP Packages

Product Applications

n Notebook and Palmtop Computers

n Telecom Systems

n Portable Instruments

n Battery-Operated Digital Devices

n DC Power Distribution Systems

Product Specifications

Product Photos

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