MAX9934TART 데이터 시트보기 (PDF) - Maxim Integrated

부품명

상세내역

제조사

MAX9934TART

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing

Maxim Integrated 

High-Precision, Low-Voltage, Current-Sense Amplifier

with Current Output and Chip Select for Multiplexing

PIN/BUMP

UCSP µMAX µDFN

A1

1

1

A2

2

2

A3

3

3

B1

8

6

B2

7

5

B3

6

4

—

4, 5

—

Pin Description

NAME

VCC

OUT

GND

RS+

RS-

CS

N.C.

FUNCTION

Power Supply

Current Output. OUT provides an output current proportional to input VSENSE. Connect

an external resistor (ROUT) from OUT to GND for unidirectional sensing or to an

external reference voltage for bidirectional sensing.

Ground

Sense Resistor Power Side Connection

Sense Resistor Load Side Connection

Chip-Select Input. Drive CS high to enable OUT, drive CS low to put OUT in a high-

impedance state.

No Connection. Not internally connected.

Functional Diagram

MAX9934

VCC

RS+

Gm

Gm

RS-

GND

*RGAIN = 40Ω FOR THE MAX9934T AND

RGAIN = 200Ω FOR THE MAX9934F.

CS

*RGAIN

OUT

VSENSE

2V

VOUT

±1V STEP

1V

tS

% FINAL VALUE

Figure 1. Output Settling Time

% FINAL VALUE

tS

Detailed Description

The MAX9934 high-side, current-sense amplifier moni-

tors current through an external current-sense resistor

by amplifying the voltage across the resistor (VSENSE)

to create an output current (IOUT). An output voltage

(VOUT) then develops across the external output resis-

tor (ROUT). See the Typical Operating Circuit.

The MAX9934 uses precision amplifier design tech-

niques to achieve a low-input offset voltage of less than

10µV. These techniques also enable extremely low-input

offset voltage drift over time and temperature and

achieve gain error of less than 0.25%. The precision VOS

specification allows accurate current measurements with

a low-value current-sense resistor, thus reducing power

dissipation in battery-powered systems, as well as load-

regulation issues in low-voltage DC power supplies.

The MAX9934 high-side current-sense amplifier fea-

tures a -0.1V to +5.5V input common-mode range that

is independent of supply voltage (VCC). This ability to

sense at voltages beyond the supply rail allows the

monitoring of currents out of a power supply even in a

shorted condition, while also enabling high-side current

sensing at voltages greater than the MAX9934 supply

10 ______________________________________________________________________________________

Share Link: