LTC4151CS datasheet(13/16 Pages) LINER

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LTC4151/LTC4151-1

41511fa

and each of the following (if more) data bytes, as in a

Read Page command, the LTC4151/LTC4151-1 will keep

sending out each data byte in the register that corresponds

to the incrementing register pointer. The read operation

terminates and the register address pointer resets to 00h

when the master sends a Stop condition.

Layout Considerations

A Kelvin connection between the sense resistor RS and

the LTC4151/LTC4151-1 is recommended to achieve ac-

curate current sensing (Figure 10). The minimum trace

width for 1oz copper foil is 0.02" per amp to make sure

the trace stays at a reasonable temperature. Using 0.03"

per amp or wider is recommended. Note that 1oz copper

exhibits a sheet resistance of about 530μ

Ω per square.

APPLICATIONS INFORMATION

TYPICAL APPLICATION

LTC4151

SCL

VIN

48V

VIN

SENSE+ SENSE–

0.2Ω

I2C

SDA

ADR1

ADR0

ADIN

40.2k

100k AT 25°C

1.5k

VISHAY

2381 615 4.104

250mA

LOAD

GND

41511 TA02

41511 F10

SENSE–

GND

SENSE+

VIN

ADR1

ADR0

LTC4151

VIN

GND

ILOAD

Figure 10. Recommended Layout for Kelvin Connection

Temperature Monitoring with an NTC Thermistor While

Measuring Load Current and LTC4151 Supply Current

T(°C) = 58.82

× (NADIN/NVIN – 0.1066), 20°C < T < 60°C.

NADIN and NVIN are digital codes measured by the ADC at the

ADIN and VIN pins, respectively.

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