LTC2978 - Octal PMBus Power Supply Monitor and Controller with EEPROM

Features

• Click Here for LTC2978 Evaluation Kits
• PMBus Compliant Interface and Command Set
• Configuration EEPROM
• Fault Logging to Internal EEPROM
• Differential Input, 15-Bit ΔΣ ADC with Less Than ±0.25% of Total Unadjusted Error
• Monitors Eight Output Channels and One Input Voltage
• 8-Channel Sequencer
• Programmable Watchdog Timer
• Eight UV/OV Voltage Supervisors
• Eight 10-Bit Voltage-Buffered IDACs with Soft Connect
• Linear, Voltage Servo Adjusts Supply Voltages by Ramping Voltage-Buffered IDAC Outputs Up/Down
• Supports Multichannel Fault Management
• On-Chip Digital Temperature Sensor
• Available in 64-Pin 9mm × 9mm QFN Package

Typical Application

Description

The LTC2978 is an octal, PMBus compliant power supply monitor, supervisor, sequencer and margin controller. PMBus functions include warning and fault OV/UV threshold pairs for eight output channels and one input channel. Programmable fault response allows the power supplies to be disabled with optional retry after a fault has been detected. PMBus reads allow eight output voltages and one input voltage to be monitored. In addition, odd numbered channels can substitute sense resistor voltage measurements for output voltage measurements. PMBus commands support power supply sequencing and precision point-of-load voltage servo to one of three programmed values: margin high, margin low and nominal. A programmable watchdog timer monitors microprocessor activity for a stalled condition and resets the micro if necessary. The 1-wire synchronization bus supports power supply sequencing across multiple LTC2978 devices. User programmable parameters can be stored in EEPROM. Voltage supervisor, voltage monitor and temperature faults can also be logged to EEPROM.

Packaging

QFN-64

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LTC2978CUP#PBF	QFN	64	C	$15.64	$10.95	View
LTC2978CUP#TRPBF	QFN	64	C		$11.05	View
LTC2978IUP#PBF	QFN	64	I	$17.99	$12.59	View
LTC2978IUP#TRPBF	QFN	64	I		$12.69	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number	Description	Price
DC1540A	LTC2978 Demoboard (includes DC1360A + DC1361A), requires DC1613A	$199.00
DC1508A	Socketed LTC2978 Programming Board	$75.00
DC1613A	USB-to-PMBus Dongle	$50.00
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Applications

• Computers
• Network Servers

Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

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