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LTC2970C

Dual I2C Power Supply Monitor and Margining Controller

Linear Technology 

FEATURES

■ Less Than ±0.5% Total Unadjusted Error 14-Bit ΔΣ

ADC with On-Chip Reference

■ Dual, 8-Bit IDACs with 1x Voltage Buffers

■ Linear, Voltage Servo Adjusts Supply Voltages by

Ramping IDAC Outputs Up/Down

■ I2C™ Bus Interface (SMBus Compatible)

■ Extensive, User Configurable Fault Monitoring

■ On-Chip Temperature Sensor

■ Available in 24-Lead 4mm × 5mm QFN Package

U

APPLICATIO S

■ Dual Power Supply Voltage Servo

■ Monitoring Supply Voltage and Current

■ Programmable Power Supplies

■ Programmable Reference

LTC2970/LTC2970-1

Dual I2C Power

Supply Monitor and

Margining Controller

DESCRIPTIO

The LTC®2970 is a dual power supply monitor and

margining controller with an SMBus compatible I2C bus

interface. A low-drift, on-chip reference and 14-bit ΔΣ A/D

converter allow precise measurements of supply voltages,

load currents or internal die temperature. Fault manage-

ment allows ⎯A⎯L⎯E⎯R⎯T to be asserted for configurable over

and under voltage fault conditions. Two voltage buffered,

8-bit IDACs allow highly accurate programming of DC/DC

converter output voltages. The IDACs can be configured

to automatically servo the power supplies to the desired

voltages using the ADC. The LTC2970-1 adds a tracking

feature that can be used to turn multiple power supplies

on or off in a controlled manner.

The bus address is set to 1 of 9 possible combinations by

pin strapping the ASEL0 and ASEL1 pins. The LTC2970/

LTC2970-1 are packaged in the 24-lead, 4mm × 5mm

QFN package.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

Dual Power Supply Monitor and Controller (One of Two Channels Shown)

8V TO 15V

VIN IN

OUT

I+

I–

DC/DC

CONVERTER

12VIN

VDD

1/2 LTC2970

VIN0_BM

VIN0_BP

VOUT0

VIN0_AP

GPIO_CFG

ALERT

SCL

SDA

0.1μF

0.1μF

I2C BUS

( ) SMBUS

COMPATIBLE

RUN/SS FB

LOAD

IOUT0

GPIO_0

GND SGND

VIN0_AM

REF

GND ASEL0 ASEL1

0.1μF

ADC Total Unadjusted Error

vs Temperature

0.50 15 PARTS MOUNTED ON PCB

0.25

0

–0.25

–0.50

–50 –25 0

ADC VIN = 5V

25 50 75 100

TEMPERATURE (°C)

29701 TA01b

29701 TA01

29701fc

1

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