LTC3833 Series

Fast Accurate Step-Down DC/DC Controller with Differential Output Sensing

Catalog

Fast Accurate Step-Down DC/DC Controller with Differential Output Sensing

Part	Number of Outputs	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Function	Output Phases	Output Configuration	Frequency - Switching [Max]	Frequency - Switching [Min]	Mounting Type	Supplier Device Package	Package / Case	Output Type	Control Features	Package / Case [custom]	Package / Case [custom]	Package / Case [custom]
Analog Devices LTC3833EUDC#TRPBF	1	38 V	4.5 V	Buck	-40 °C	125 ¯C	Step-Down	1	Positive	2 MHz	200 kHz	Surface Mount	20-QFN (3x4)	20-WFQFN Exposed Pad	Transistor Driver	Enable Frequency Control Power Good Soft Start Tracking
Analog Devices LTC3833IUDC#PBF	1	38 V	4.5 V	Buck	-40 °C	125 ¯C	Step-Down	1	Positive	2 MHz	200 kHz	Surface Mount	20-QFN (3x4)	20-WFQFN Exposed Pad	Transistor Driver	Enable Frequency Control Power Good Soft Start Tracking
Analog Devices LTC3833EUDC#PBF	1	38 V	4.5 V	Buck	-40 °C	125 ¯C	Step-Down	1	Positive	2 MHz	200 kHz	Surface Mount	20-QFN (3x4)	20-WFQFN Exposed Pad	Transistor Driver	Enable Frequency Control Power Good Soft Start Tracking
Analog Devices LTC3833IFE#TRPBF	1	38 V	4.5 V	Buck	-40 °C	125 ¯C	Step-Down	1	Positive	2 MHz	200 kHz	Surface Mount	20-TSSOP-EP		Transistor Driver	Enable Frequency Control Power Good Soft Start Tracking	0.173 in 4.4 mm	Exposed Pad	20-TSSOP
Analog Devices LTC3833IUDC#TRPBF	1	38 V	4.5 V	Buck	-40 °C	125 ¯C	Step-Down	1	Positive	2 MHz	200 kHz	Surface Mount	20-QFN (3x4)	20-WFQFN Exposed Pad	Transistor Driver	Enable Frequency Control Power Good Soft Start Tracking
Analog Devices LTC3833EFE#TRPBF	1	38 V	4.5 V	Buck	-40 °C	125 ¯C	Step-Down	1	Positive	2 MHz	200 kHz	Surface Mount	20-TSSOP-EP		Transistor Driver	Enable Frequency Control Power Good Soft Start Tracking	0.173 in 4.4 mm	Exposed Pad	20-TSSOP

Catalog

Fast Accurate Step-Down DC/DC Controller with Differential Output Sensing

Key Features

• Wide VINRange: 4.5V to 38V

• VOUTRange: 0.6V to 5.5V

• Output Accuracy: ±0.25% at 25°C and ±0.67% over Temperature

• Differential Output Sensing Allowing Up to 500mV Line Loss

• Fast Load Transient Response

• tON(MIN)= 20ns, tOFF(MIN)= 90ns

• Controlled On-Time Valley Current Mode Architecture

• Frequency Programmable from 200kHz to 2MHz and Synchronizable to External Clock

• RSENSEor Inductor DCR Current Sensing

• Overvoltage Protection and Current Limit Foldback

• Power Good Output Voltage Monitor

• Output Tracking or Adjustable Soft-Start

• External VCCInput for Bypassing Internal LDO

• 20-Pin QFN (3mm × 4mm) and TSSOP Packages

Description

The LTC3833 is a synchronous step-down DC/DC switching regulator controller targeted for high power applications. It drives all N-channel power MOSFETs. The controlled on-time valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUTand load current.Differential output voltage sensing along with a precision internal reference combine to offer ±0.67% output regulation and the ability to correct for up to ±500mV variations in the output terminals due to line losses. The operating frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronized to an external clock for noise and EMI sensitive applications.Very low tONand tOFFtimes allow for near 0% and near 100% duty cycles, respectively. Programmable soft-start or output voltage tracking is available. Safety features include output overvoltage protection, programmable current limit with foldback, and a power good output signal.ApplicationsDistributed Power SystemsPoint-of-Load ConvertersComputing SystemsDatacomm Systems