LTC4151CDD datasheet(6/16 Pages) LINER

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LTC4151/LTC4151-1

41511fa

PIN FUNCTIONS

SENSE+ (Pin 1): Kelvin Sense of the VIN Pin. See Figure 10

for recommended Kelvin connection.

VIN (Pin 2): Supply Voltage Input. Accepts 7V to 80V.

The voltage at this pin is monitored by the onboard ADC

with a full-scale input range of 102.4V. SENSE+ must be

connected to VIN for proper ADC readout.

ADR1, ADR0 (Pin 3, Pin 4): I2C Device Address Inputs.

Connecting ADR1 and ADR0 to VIN, GND or leaving the pins

open conﬁgures one of nine possible addresses. See Table 1

in the Applications Information section for details.

ADIN (Pin 5): ADC Input. The onboard ADC measures volt-

age range between 0V and 2.048V. Tie to GND if unused.

SCL (Pin 6): I2C Bus Clock Input. Data is shifted in and out

at the SDA pin on rising edges of SCL. This pin is driven

by an open collector output from a master controller. An

external pull-up resistor or current source is required and

can be placed between SCL and VIN. The voltage at SCL

is internally clamped to 6V (5.5V minimum).

SDA (Pin 7, LTC4151 Only): I2C Bus Data Input/Output.

Used for shifting in address, command or data bits and

sending out data. An external pull-up resistor or current

source is required and can be placed between SDA and VIN.

The voltage at SDA is internally clamped to 6V (5.5V

minimum).

SDAI (Pin 7, LTC4151-1 Only): I2C Bus Data Input. Used

for shifting in address, command or data bits. This pin is

driven by an open collector output from a master controller.

An external pull-up resistor or current source is required

and can be placed between SDAI and VIN. The voltage at

SDAI is internally clamped to 6V (5.5V minimum).

SDAO (Pin 8, LTC4151-1 Only): Inverted Serial Bus Data

Output. Open-drain output used for sending data back to the

master controller or acknowledging a write operation. Data

is inverted for convenience of optoisolation. An external

pull-up resistor or current source is required.

SHDN (Pin 8, LTC4151 Only): Shutdown Input. Internally

pulled up to 6.3V. Pull this pin below 1V to force the LTC4151

into shutdown mode. Leave this pin open if unused.

GND (Pin 9): Device Ground.

SENSE– (Pin 10):

High Side Current Sense Input. Connect

an external sense resistor between SENSE+ and SENSE–.

The differential voltage between SENSE+ and SENSE– is

monitored by the onboard ADC with a full-scale sense

voltage of 81.92mV.

Exposed Pad (Pin 11, DD Package Only): Exposed pad

may be left open or connected to device ground (GND).

(DD/MS)

TYPICAL PERFORMANCE CHARACTERISTICS V

IN = 12V, TA = 25°C, unless noted.

SDA, SDAO Output Low vs

Pull-Up Current (VSDA(OL) vs ISDA)

SDA, SDAI, SCL Clamp Voltage

vs Load Current

ISDA (mA)

0.3

0.4

0.2

0.1

0.5

41511 G09

– 40°C

25°C

85°C

ILOAD (mA)

0.01

0.1

6.2

6.1

6.0

5.9

6.3

41511 G10

– 40°C

85°C

25°C

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