LTC3838 Series

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

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

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

Part	Number of Outputs	Control Features	Frequency - Switching [Min]	Frequency - Switching [Max]	Output Type	Function	Package / Case	Topology	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Phases	Supplier Device Package	Mounting Type	Package / Case
Analog Devices Inc./Maxim Integrated LTC3838IUHF#TRPBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-WFQFN Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-QFN (5x7)	Surface Mount
Analog Devices Inc./Maxim Integrated LTC3838EUHF#PBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-WFQFN Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-QFN (5x7)	Surface Mount
Analog Devices Inc./Maxim Integrated LTC3838EFE#PBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-TFSOP Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-TSSOP-EP	Surface Mount	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3838IUHF-2#PBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-WFQFN Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-QFN (5x7)	Surface Mount
Analog Devices Inc./Maxim Integrated LTC3838IUHF#PBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-WFQFN Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-QFN (5x7)	Surface Mount
Analog Devices Inc./Maxim Integrated LTC3838EFE#PBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-TFSOP Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-TSSOP-EP	Surface Mount	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3838EFE#TRPBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-TFSOP Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-TSSOP-EP	Surface Mount	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3838EUHF-2#PBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-WFQFN Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-QFN (5x7)	Surface Mount
Analog Devices Inc./Maxim Integrated LTC3838IFE#TRPBF	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-TFSOP Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-TSSOP-EP	Surface Mount	0.173 " 4.4 mm
Analog Devices Inc./Maxim Integrated LTC3838IFE	2	Enable Frequency Control Phase Control Power Good Soft Start Tracking	200 kHz	2 MHz	Transistor Driver	Step-Down	38-TFSOP Exposed Pad	Buck	Positive	-40 C	125 °C	4.5 V	38 V	2	38-TSSOP-EP	Surface Mount	0.173 " 4.4 mm

Description

The LTC3838-2 is a dual-channel, PolyPhase®synchronous step-down DC/DC switching regulator controller. Two independent channels drive all N-channel power MOSFETs. The two channels can also be combined into a multiphase single output configuration with external reference.The controlled on-time, valley current mode control architecture allows for not only fast response to transients without a clock delay, but also constant frequency switching at a steady-load condition. Its proprietary load-release transient detection feature (DTR) significantly reduces overshoot at low output voltages.The switching frequency can be programmed from 200kHz to 2MHz with an external resistor, and can be synchronized to an external clock. Very low tONand tOFFtimes allow for near 0% and near 100% duty cycles, respectively. Voltage tracking soft start-up and multiple safety features are provided.See below for a comparison of LTC3838, LTC3838-1 and LTC3838-2.Part NumberDescriptionLTC3838±0.67% Differential Output Voltage Accuracy Over Temperature on Channel 1, ±1% Output Regulation on Channel 2, Separate Per Channel 30mV to 100mV Current Sense Range ControlsLTC3838-1±0.67% Differential Output Voltage Accuracy Over Temperature on Both Channel 1 and Channel 2, Single Pin 30mV/60mV Current Sense Range ControlsLTC3838-2±0.67% Differential Output Voltage Accuracy With Internal Reference on Channel 1, ±4mV Differential with External Reference Voltage on Channel 2, Fixed 30mV Current Sense RangeApplicationsPower for ASICs with Dynamic Voltage ScalingLow Voltage, High Current, High Step-Down Ratio Converters That Demand Tight Transient Regulation