• 简体中文
• English

LTC3838-1 - Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing

The LTC®3838-1 is a dual-channel, PolyPhase® synchronous step-down DC/DC switching regulator controller. Two independent channels drive all N-channel power MOSFETs. The controlled on-time, valley current mode control architecture allows for not only fast response to transients without clock delay, but also constant frequency switching at steady load condition. Its proprietary loadrelease transient detection feature (DTR) significantly reduces overshoot at low output voltages.

A precision internal reference enables accurate differential output regulation. The dual channels can either provide two independent output voltages, or be combined into multiphase single-output configuration.

The switching frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronized to an external clock. Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up and multiple safety features are provided.

See Table 1 for a comparison of LTC3838, LTC3838-1 and LTC3838-2.

Features Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V Two Independent Channels: Dual/Single Output Output Voltage Regulation Accuracy: ±0.67% (VOUT1) and ±0.75% (VOUT2) Over Temperature Differential Remote Output Sensing: Up to ±500mV (VOUT1) and ±200mV (VOUT2) Ground Deviations Controlled On-Time, Valley Current Mode Control Fast Load Transient Response Without Clock Delay Detect Transient Release (DTR) Reduces VOUT Overshoot Frequency Programmable from 200kHz to 2MHz, Synchronizable to External Clock tON(MIN) = 30ns, tOFF(MIN) = 90ns RSENSE or Inductor DCR Current Sensing Overvoltage Protection and Current Limit Foldback Power Good Output Voltage Monitor Output Voltage Tracking and Adjustable Soft Start-Up Thermally Enhanced 38-Pin (5mm × 7mm) QFN Package Typical Application

Applications Distributed Power Systems; Power Supply for ASIC Computing, Data Storage, Communication Systems Low Voltage, High Current, and/or High Step-Down Ratio Converters That Demand Tight Load Transient Regulation Packaging

Order Information

Demo Boards