General Description

The MAX9934** high-precision, low-voltage, high-side

current-sense amplifier is ideal for both bidirectional

(charge/discharge) and unidirectional current measure-

ments in battery-powered portable and laptop devices.

across the -0.1V to 5.5V input common-mode voltage

specification allows the use of very small sense volt-

ages (typically ±10mV full-scale) for minimally invasive

current sensing.

The output of the MAX9934 is a current proportional to

than 0.25% (max) at +25°C. A chip select (CS) allows

multiplexing of several MAX9934 current outputs to a

single microcontroller ADC channel (see the

Typical

Operating Circuit). CS is compatible with 1.8V and 3.3V

logic systems.

The MAX9934 is designed to operate from a 2.5V to

draw less than 0.1nA (typ) leakage current to reduce

battery load. The MAX9934 is robust and protected

from input faults of up to ±6V input differential voltage

between RS+ and RS-.

The MAX9934 is specified for operation over the -40°C

to +125°C temperature range and is available in 8-pin

bump UCSP™ (1mm x 1.5mm x 0.6mm), making it ideal

for space-sensitive applications.

Applications

PDAs and Smartphones

MP3 Players

Sensor Instrumentation Amplifiers

Notebook PCs and Ultra-Mobile PCs

Portable Current Monitoring

Features

o Input Offset Voltage: 10µV (max)

o Gain Error Less than 0.25%

o -0.1V to +5.5V Input Common-Mode Voltage

Range

o Chip Select Allows Multiplexing Several MAX9934

Current Monitors to One ADC

for Gain Flexibility

o Single Supply Operation: 2.5V to 3.6V

and 5µA/mV (MAX9934F)

o Bidirectional or Unidirectional Operation

o Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm),

6-Pin µDFN (2mm x 2mm x 0.6mm), and 8-Pin

µMAX Packages

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

with Current Output and Chip Select for Multiplexing

________________________________________________________________

Maxim Integrated Products

1

19-5011; Rev 0; 10/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

Ordering Information

PART

GAIN

PIN-

PACKAGE

TOP

MARK

MAX9934FALT+T*

5µA/mV

6 µDFN

ACP

MAX9934FART+T*

5µA/mV

6 UCSP

AAG

MAX9934FAUA+T

5µA/mV

8 µMAX

—

MAX9934TALT+T*

25µA/mV

6 µDFN

ACO

MAX9934TART+T*

25µA/mV

6 UCSP

AAF

MAX9934TAUA+T

25µA/mV

8 µMAX

—

Note: All devices are specified over the -40°C to +125°C

extended temperature range.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*

Future product—contact factory for availability.

µMAX is a registered trademark and UCSP is a trademark of

Maxim Integrated Products, Inc.

**Patent pending.

RS-

RS+

-0.1V

CS

GND

MAX9934

OUT

10k

Ω

FROM

µC

CHIP SELECT

1000pF

0.1

µF

Typical Operating Circuit