LTC3884 - Dual Output PolyPhase Step-Down Controller with Sub-Milliohm DCR Sensing and Digital Power System Management

The LTC®3884 is a dual output PolyPhase DC/DC synchronous step-down switching regulator controller with an I2C-based PMBus compliant serial interface. The controller employs a constant-frequency current mode architecture, together with a unique scheme to provide excellent performance for sub-milliohm DCR applications. The LTC3884 is supported by the LTpowerPlay® software development tool with graphical user interface (GUI).

Programmable loop compensation allows the controller to be compensated digitally. Switching frequency, channel phasing output voltage, and device address can be programmed both by the digital interface as well as external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Both outputs have independent power good indicators and FAULT function.

The LTC3884 can be configured for discontinuous (pulseskipping) mode or continuous inductor current mode.

Features

PMBus/I2C Compliant Serial Interface– Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT, Temperature and Faults – Programmable Voltage, Current Limit, Digital Soft- Start/Stop, Sequencing, Margining, OV/UV/OC
Sub-Milliohm DCR Current Sensing
Digitally Adjustable Loop Compensation Parameters
±0.5% Output Voltage Accuracy Over Temperature
Integrated Input Current Sense Amplifier
Internal EEPROM and Fault Logging
Integrated N-Channel MOSFET Gate Drivers
Wide VIN Range: 4.5V to 38V
VOUT Range: 0.5V to 3.5V (with Low DCR Setting); 0.5V to 5.5V (without Low DCR Setting)
Accurate PolyPhase® Current Sharing for Up to 6 Phases
Available in a 48-Lead (7mm × 7mm) QFN Package

Typical Application

Applications

Telecom, Datacom, and Storage Systems
Industrial and Point-of-Load Applications

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3884EUK#PBF	7x7 QFN-48	E	$9.07	$6.35
LTC3884EUK#TRPBF	7x7 QFN-48	E		$6.41
LTC3884IUK#PBF	7x7 QFN-48	I	$9.91	$6.94
LTC3884IUK#TRPBF	7x7 QFN-48	I		$7.00

Demo Boards

Part Number	Description	Price
DC2165A	LTC3884EUK Demo Board \| Dual PMBus Buck, 4.5V ≤ Vin ≤ 14V, Vout0/Vout1 = 0.5V to 1.8V @ 30A	$200.00
DC2283A	LTC3884EUK Demo Board \| LTC3884(x2) 4-Phase PMBus Buck, 7V ≤ VIN ≤ 14V; 0.5V ≤ VOUT ≤ 1.5V @ 160A	Contact Factory