LTC3886 - 60V Dual Output Step-Down Controller with Digital Power System Management

The LTC®3886 is a dual PolyPhase DC/DC synchronous step-down switching regulator controller with I2C-based PMBus compliant serial interface. This controller employs a constant-frequency, current-mode architecture, with high voltage input and output capability along with programmable loop compensation. The LTC3886 is supported by the LTpowerPlay™ software development tool with graphical user interface (GUI).

The EXTVCC pin supports voltages up to 14V allowing for optimized circuit efficiency and die temperature, and for the controller output to supply the chip power. Switching frequency, output voltage, and device address can be programmed both by digital interface as well as external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Both outputs have an independent power good indicator and FAULT function.

The LTC3886 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, Frequency, and Control Loop Compensation
Output Error Less Than ±0.5% Over Temperature
Integrated 16-Bit ADC and 12-Bit DAC
Integrated High Side Current Sense Amplifier
Internal EEPROM and Fault Logging
Integrated N-Channel MOSFET Gate Drivers
Wide VIN Range: 4.5V to 60V
VOUT0, VOUT1 Range: 0.5V to 13.8V
Analog Current Mode Control
Accurate PolyPhase® Current Sharing for Up to 6 Phases (100kHz to 750kHz)
Available in a 52-Lead (7mm × 8mm) 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)*
LTC3886EUKG#PBF	7x8 QFN-52	E	$9.07	$6.35
LTC3886EUKG#TRPBF	7x8 QFN-52	E		$6.41
LTC3886IUKG#PBF	7x8 QFN-52	I	$9.91	$6.94
LTC3886IUKG#TRPBF	7x8 QFN-52	I		$7.00

Demo Boards

Part Number	Description	Price
DC2155A-A	LTC3886EUKG Demo Board \| Dual Digital PSM Buck; 18V ≤ VIN ≤ 54V; Vout0/Vout1 = 12V/5V @ 12A	Contact Factory
DC2277A	LTC3886 UKG Package Clamshell Programming Demo Board	Contact Factory