Analog Devices LTC3838

Description

The LTC®3838 is a dual, 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 fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current. Its load-release transient detection feature significantly reduces overshoot at low output voltages.Differential output voltage sensing, along with a precision internal reference, offers an accurate ±0.67% output regulation on Channel 1, even if the remote output ground deviates from local ground by ±500mV. The second channel can either provide an independent ±1% output, or togetherwith the first channel of this controller, serve as one of the PolyPhase channels for a single-output voltage.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.

Features

• Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V
• ±0.67% Output Voltage Accuracy Over Temperature, Differential Output Voltage Sensing, Allowing Up to ±500mV Line Loss at Remote Ground on Channel 1
• ±1% Output on the Independent 2nd Channel
• Controlled On-Time, Valley Current Mode Control
• Fast Load Transient Response
• Detect Transient (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 and TSSOP packages

Typical applications

• Computing Systems
• Distributed Power Systems
• Data Communication Systems
• Point-of-Load Converters

More information

• Datasheet
• IC product information