MAX9928FABTT datasheet(9/14 Pages) MAXIM

Part #	MAX9928FABTT

Description	-0.1V to 28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers

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Manufacturer	MAXIM [Maxim Integrated Products]

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9 / 14 page

-0.1V to +28V Input Range, Micropower,

Uni-/Bidirectional, Current-Sense Amplifiers

_______________________________________________________________________________________

9

For both positive and negative VSENSE voltages, the

current flowing out of the current mirror is equal to:

IOUT = M x |VSENSE|/RG1

For the MAX9928F, the transconductance of the device

is trimmed so that IOUT/|VSENSE| = 5µA/mV. For the

MAX9929F, the voltage gain of the device is trimmed

so that VOUT/|VSENSE| = 50V/V. The SIGN output from

the comparator indicates the polarity of VSENSE.

Current Output (MAX9928F)

The output voltage equation for the MAX9928_ is given

below:

VOUT = (RSENSE x ILOAD) x (Gm X ROUT)

where VOUT = the desired full-scale output voltage,

ILOAD = the full-scale current being sensed, RSENSE =

the current-sense resistor, ROUT = the voltage-setting

resistor, and Gm = MAX9928F transconductance

(5µA/mV).

The full-scale output voltage range can be set by

changing the ROUT resistor value. The above equation

can be modified to determine the ROUT required for a

particular full-scale range:

ROUT = (VOUT)/(ILOAD x RSENSE x Gm)

OUT is a high-impedance current source and can drive

an unlimited amount of capacitance.

CURRENT

MIRROR

MAX9928F

MAX9929F

C

S2

S1

Q1

Q2

10k

Ω*

SIGN

OUT

VCC

VIN

-0.1V TO +28V

(VBATT)

+

-

2.5V TO 5.5V

RG1

80k

Ω

RG2

80k

Ω

RC2

80k

Ω

RC1

80k

Ω

RS-

RS+

TO

LOAD/CHARGER

TO ADC

TO

μC

*INTERNAL 10k

Ω RESISTOR FOR MAX9929_ ONLY.

GND

A

VCC

1M

Ω

Figure 1. Functional Diagram

0

-1.2

-1.8

-3.0

3.0

2.0

1.0

0

-1.2

-1.8

-3.0

3.0

2.0

1.0

VSENSE (mV)

( ) FOR THE MAX9929F.

Figure 2. Ideal Transfer Characteristics with 0mV Amplifier Input

Offset Voltage and -1mV Comparator Input Offset Voltage

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