LM3813 datasheet(2/14 Pages) NSC

2 / 14 page

Ordering Information

Order No.

Sense

Range

Sampling

Interval*

Sensing

Method

Package

Number

‡

Package

Type

Supplied As:

LM3812M-1.0

±1A

50 ms

High-side

M08A

SO-8

95 units in Rails

LM3812MX-1.0

±1A

50 ms

High-side

M08A

SO-8

2.5k units on Tape and Reel

LM3812M-7.0

±7A

50 ms

High-side

M08A

SO-8

95 units in Rails

LM3812MX-7.0

±7A

50 ms

High-side

M08A

SO-8

2.5k units on Tape and Reel

LM3813M-1.0

±1A

50 ms

Low-side

M08A

SO-8

95 units in Rails

LM3813MX-1.0

±1A

50 ms

Low-side

M08A

SO-8

2.5k units on Tape and Reel

LM3813M-7.0

±7A

50 ms

Low-side

M08A

SO-8

95 units in Rails

LM3813MX-7.0

±7A

50 ms

Low-side

M08A

SO-8

2.5k units on Tape and Reel

# Suffix M indicates that the part is available in Surface Mount package. Suffix X indicates that the part is available in 2.5k units

on Tape and Reel.

* Current is sampled over a fixed interval. The average current during this interval is indicated by the duty cycle of the PWM output

during next interval.

‡ The Package code M08A is internal to National Semiconductor and indicates an 8-lead surface mount package, SO-8.

Pin Description (High-Side, LM3812)

Name

Function

SENSE+, V

High side of internal current sense, also supply voltage.

SENSE−

Low side of internal current sense.

FLTR+

Filter input — provides anti-aliasing for delta sigma modulator.

FLTR−

Filter input.

5SD

Shutdown pin. Connected to V

DD through a pull up resistor for normal operation.

When low, the IC goes into a low current mode (typically 3 µA).

PWM

PWM output indicates the current magnitude and direction.

GND

Ground

GND

Ground

Pin Description (Low-Side, LM3813)

Name

Function

SENSE+, GND

High side of internal current sense, also ground.

SENSE−

Low side of internal current sense.

FLTR+

Filter input – provides anti-aliasing for delta sigma modulator.

FLTR−

Filter input.

5SD

Shutdown pin. Connected to V

DD through a pull up resistor for normal operation.

When low, the IC goes into a low current mode (typically 3 µA).

PWM

PWM output indicates the current magnitude and direction.

GND

Ground

DD (supply)

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