LTC3823 Series

Fast No RSENSE™Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL

Catalog

Fast No RSENSE™Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL

Part	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Topology	Operating Temperature [Max]	Operating Temperature [Min]	Control Features	Mounting Type	Duty Cycle (Max) [Max]	Package / Case	Function	Supplier Device Package	Output Phases	Output Type	Number of Outputs
Analog Devices LTC3823EGN#PBF	4.5 V	36 V	Positive	Buck	85 °C	-40 °C	Enable On Time Control Power Good Soft Start Tracking	Surface Mount	90 %	28-SSOP	Step-Down	28-SSOP	1	Transistor Driver	1
Analog Devices LTC3823IUH#PBF	4.5 V	36 V	Positive	Buck	85 °C	-40 °C	Enable On Time Control Power Good Soft Start Tracking	Surface Mount	90 %		Step-Down	32-QFN (5x5)	1	Transistor Driver	1
Analog Devices LTC3823EUH#PBF	4.5 V	36 V	Positive	Buck	85 °C	-40 °C	Enable On Time Control Power Good Soft Start Tracking	Surface Mount	90 %		Step-Down	32-QFN (5x5)	1	Transistor Driver	1
Analog Devices LTC3823IGN#PBF	4.5 V	36 V	Positive	Buck	85 °C	-40 °C	Enable On Time Control Power Good Soft Start Tracking	Surface Mount	90 %	28-SSOP	Step-Down	28-SSOP	1	Transistor Driver	1

Catalog

Fast No RSENSE™Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL

Key Features

• Wide VINRange: 4.5V to 36V

• ±0.67%, 0.6V Reference Voltage

• Output Voltage Tracking Capability

• True Remote Sensing Differential Amplifier

• Sense Resistor Optional

• True Current Mode Control

• 2% to 90% Duty Cycle at 200kHz

• tON(MIN)< 100ns

• Phase-Locked Loop Frequency Synchronization

• Powerful Dual N-Channel MOSFET Driver

• Adjustable Cycle-by-Cycle Current Limit

• Adjustable Switching Frequency

• Programmable Soft-Start

• Current Foldback Protection (Disabled at Start-Up)

• Output Overvoltage Protection

• Micropower Shutdown: 30μA

• Power Good Output Voltage Monitor Tracks the Reference Input Pin

• Available in (5mm × 5mm) 32-Lead QFN and 28-Lead SSOP Narrow Packages

Description

The LTC3823 is a synchronous step-down switching regulator controller with true remote differential output sensing and output voltage up/down tracking capability. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.The LTC3823 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock.Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to as low as a 0.6V output. When using remote sense, output voltages up to 3.3V can be developed, and up to 90% of VINwithout remote sense. Power supply sequencing is accomplished using an external soft-start timing capacitor.ApplicationsDistributed Power SystemsServer Power Supplies