Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Op-amp Current sensor uMAX 8

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX4069–MAX4072 low-cost, bidirectional, high-

side, current-sense amplifiers are ideal for monitoring

battery charge and discharge currents in notebooks,

cell phones, and other portable equipment. They fea-

ture up to 24V input common-mode voltage range, low

100µA supply current (which drops to only 10µA in

shutdown), and a total output error of less than 1.5%.

The wide 1.35V to 24V input common-mode range is

independent of the supply voltage, ensuring that the

current-sense feedback remains accurate even when

connected to a battery pack in deep discharge.

To achieve maximum flexibility, an external current-sense

resistor is used along with a Gain Select pin to choose

either 50V/V or 100V/V. A single output pin continuously

monitors the transition from charge to discharge and

avoids the need for a separate polarity output. The

MAX4070 contains an internal 2.5V reference. The

charging current is represented by an output voltage

from 2.5V to V

, while discharge current is given from

2.5V to GND. The MAX4071 is similar, but with a refer-

ence voltage of 1.5V. The MAX4069 has an adjustable

reference voltage, set by two external resistors. The

MAX4072 has an input for an external reference.

The MAX4069/MAX4071/MAX4072 operate from a 2.7V to

24V single supply. The MAX4070 operates from a 3.6V to

24V single supply. All devices are specified over the

automotive operating temperature range, -40°C to

+125°C. The MAX4070/MAX4071/MAX4072 are available

in 8-pin µMAX and 8-pin thin QFN packages. The

MAX4069 is available in a 10-pin µMAX

package.

Applications

Notebook Fuel Gauging

Smart-Battery Packs/Chargers

Motor Control

Power-Management Systems

Cell-Phone Battery-Current Monitoring

Features

♦ Bidirectional, Compact, Current-Sense Solution

♦ Total Output Error Less than 1.5%

♦ Selectable Gain of 50V/V or 100V/V

♦ Wide 1.35V to 24V Common-Mode Range

Independent of Supply Voltage

♦ 2.7V to 24V Single-Supply Operation

♦ Internal Precision Reference

Adjustable (MAX4069)

2.50V (MAX4070)

1.50V (MAX4071)

♦ Low 100µA Supply Current

♦ 10µA Supply Current in Shutdown

♦ Available in Space-Saving Packages

8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)

8-Pin µMAX (MAX4070/MAX4071MAX4072)

10-Pin µMAX (MAX4069)

Bidirectional, High-Side, Current-Sense

Amplifiers with Reference

Ordering Information

MAX4070

BATT

= 1.35V TO 24V

= 3.6V TO 24V

FROM BATTERY

CHARGER

SENSE

LOAD

TO ADC

2.5V

GSEL

GND

RS- RS+

REFOUT

OUT

SHDN

Typical Operating Circuit

PART TEMP RANGE PIN-PACKAGE

TOP

MARK

MAX4069AUB -40°C to +125°C 10 µMAX —

MAX4070AUA -40°C to +125°C 8 µMAX —

MAX4070ATA -40°C to +125°C 8 Thin QFN-EP* ABN

MAX4071AUA -40°C to +125°C 8 µMAX —

MAX4071ATA -40°C to +125°C 8 Thin QFN-EP* ABO

MAX4072AUA -40°C to +125°C 8 µMAX —

MAX4072ATA -40°C to +125°C 8 Thin QFN-EP* ABP

Pin Configurations and Selector Guide appear at end of

data sheet.

EP = Exposed pad.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Typical Operating Circuit

19-2423; Rev 3; 11/08

MAX4069–MAX4072

Summary of content (18 pages)

PAGE 1
MAX4069–MAX4072 LE AVAILAB Bidirectional, High-Side, Current-Sense Amplifiers with Reference General Description The MAX4069–MAX4072 low-cost, bidirectional, highside, current-sense amplifiers are ideal for monitoring battery charge and discharge currents in notebooks, cell phones, and other portable equipment. They feature up to 24V input common-mode voltage range, low 100µA supply current (which drops to only 10µA in shutdown), and a total output error of less than 1.5%. The wide 1.
PAGE 2
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference ABSOLUTE MAXIMUM RATINGS VCC, RS+, RS- to GND ...........................................-0.3V to +26V OUT to GND ....................-0.3V to Lesser of (VCC + 0.3V) or 15V Differential Input Voltage (VRS+ - VRS-) ..............................±0.3V GSEL, SHDN, REFOUT, REFIN and ADJ to GND.....................................-0.3V to (VCC + 0.3V) OUT Short-Circuit Duration to GND or to Lesser of (VCC or 15V) ..................
PAGE 3
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference ELECTRICAL CHARACTERISTICS (continued) (VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, V SHDN = VCC, VGSEL = GND, VREFIN = 2.5V (MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.
PAGE 4
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference ELECTRICAL CHARACTERISTICS (continued) (VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, V SHDN = VCC, VGSEL = GND, VREFIN = 2.5V (MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.
PAGE 5
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference ELECTRICAL CHARACTERISTICS (continued) (VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, V SHDN = VCC, VGSEL = GND, VREFIN = 2.5V (MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX TA = +25°C 2.44 2.49 2.54 TA = TMIN to TMAX 2.
PAGE 6
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Typical Operating Characteristics (VCC = VRS+ = 12V, VSENSE = 50mV for gain of 100V/V and 75mV for gain of 50V/V, TA = +25°C, unless otherwise noted.) INPUT OFFSET VOLTAGE vs. TEMPERATURE 15 10 0 -25 -50 5 -75 -100 0 -125 -150 -50 -25 0 0.1 0 -0.1 VSENSE = 50mV AV = 100V/V -0.2 -0.3 100 125 0 TOTAL ERROR vs. TEMPERATURE 1.5 MAX4069-72 toc05 0.5 AV = 100V/V 0 -0.5 1.0 0 VCC = 12V -0.5 -1.0 -1.
PAGE 7
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Typical Operating Characteristics (continued) (VCC = VRS+ = 12V, VSENSE = 50mV for gain of 100V/V and 75mV for gain of 50V/V, TA = +25°C, unless otherwise noted.) MAX4070 REFOUT vs. TEMPERATURE 1.515 1.233 1.231 1.229 2.465 2.450 1.505 1.500 1.495 -25 0 25 50 75 100 1.485 1.219 1.480 1.217 125 1.215 -50 -25 0 25 50 75 100 MAX4070 REFOUT vs. SUPPLY VOLTAGE MAX4071 REFOUT vs. SUPPLY VOLTAGE 1.501 2.
PAGE 8
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Typical Operating Characteristics (continued) (VCC = VRS+ = 12V, VSENSE = 50mV for gain of 100V/V and 75mV for gain of 50V/V, TA = +25°C, unless otherwise noted.
PAGE 9
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Pin Description PIN NAME FUNCTION MAX4069 MAX4070/ MAX4071 MAX4072 1 1 1 2 2 2 RS- Negative Connection to the External Sense Resistor 3 3 3 RS+ Positive Connection to the External Sense Resistor 4 — — N.C. No Connection. Not internally connected. 5 4 4 GND Ground. For thin QFN packages, also make an external connection from GND to the under-side exposed paddle.
PAGE 10
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Detailed Description The MAX4069–MAX4072 bidirectional, high-side, current-sense amplifiers are ideal for portable equipment. The wide 1.35V to 24V input common-mode voltage range is independent of the supply voltage, ensuring that the current-sense feedback remains accurate even when connected to a battery pack in deep discharge. The MAX4069/MAX4071/MAX4072 operate from a 2.7V to 24V single supply.
PAGE 11
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference ICHARGE RSENSE IDISCHARGE RS- 5V AV = 100 VOUT - VREF RS+ LOAD CHARGE CURRENT 2.5V VCC 2 CELLS MAX4070 GSEL OUT TO ADC -25mV 0 25mV 50mV VSENSE SHDN REFOUT 2.5V GND DISCHARGE CURRENT -2.5V Figure 2. Bidirectional Current Monitor External Reference (MAX4072) The MAX4069–MAX4072 sense a wide variety of currents with different sense-resistor values.
PAGE 12
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Table 1. Recommended Component Values FULL-SCALE CURRENT (A) 0.075 0.05 0.75 0.5 3.75 2.5 7.5 5.0 15.0 10.0 CURRENT-SENSE RESISTOR (mΩ) 1000 100 20 10 5 core, as in metal-film or wire-wound resistors, they are a straight band of metal and are available in values under 1Ω. Peak Current: The maximum current through RSENSE must be limited to: IPEAK = 0.
PAGE 13
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Pin Configurations TOP VIEW SHDN 1 RS- 2 RS+ 3 N.C. GND 10 GSEL 9 VCC 8 OUT 4 7 REFOUT 5 6 ADJ MAX4069 SHDN 1 RS- 2 RS+ 3 MAX4070 MAX4071 MAX4072 GND 4 μMAX 8 GSEL 7 VCC 6 OUT 5 REFOUT (REFIN) Thin QFN/μMAX (REFIN) FOR MAX4072 ONLY. Selector Guide Layout In order to dissipate sense-resistor heat from large sense currents, solder the RS+ and the RS- pins to large copper traces.
PAGE 14
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE CODE DOCUMENT NO. 8 TQFN-EP T833-2 21-0137 8 µMAX U8-1 21-0036 10 µMAX U10-2 21-0061 6, 8, &10L, DFN THIN.
PAGE 15
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Package Information (continued) For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. COMMON DIMENSIONS PACKAGE VARIATIONS SYMBOL MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b A 0.70 0.80 T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF E 2.90 3.
PAGE 16
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Package Information (continued) 8LUMAXD.EPS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PAGE 17
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Package Information (continued) 10LUMAX.EPS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PAGE 18
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference Revision History REVISION NUMBER REVISION DATE 3 11/08 DESCRIPTION Added information for RG1 and RG2 PAGES CHANGED 10 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.