MAX4072 Maxim, MAX4072 Datasheet

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MAX4072

Manufacturer Part Number
MAX4072
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
Manufacturer
Maxim
Datasheet

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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
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
19-2423; Rev 3; 11/08
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations and Selector Guide appear at end of
data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Notebook Fuel Gauging
Smart-Battery Packs/Chargers
Motor Control
Power-Management Systems
Cell-Phone Battery-Current Monitoring
CC
, while discharge current is given from
________________________________________________________________ Maxim Integrated Products
Bidirectional, High-Side, Current-Sense
General Description
Applications
®
package.
Amplifiers with Reference
♦ 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
♦ 2.7V to 24V Single-Supply Operation
♦ Internal Precision Reference
♦ Low 100µA Supply Current
♦ 10µA Supply Current in Shutdown
♦ Available in Space-Saving Packages
* EP = Exposed pad.
MAX4069AUB
MAX4070AUA
MAX4070ATA
MAX4071AUA
MAX4071ATA
MAX4072AUA
MAX4072ATA
Independent of Supply Voltage
V
Adjustable (MAX4069)
2.50V (MAX4070)
1.50V (MAX4071)
8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)
8-Pin µMAX (MAX4070/MAX4071MAX4072)
10-Pin µMAX (MAX4069)
PART
BATT
V
CC
= 1.35V TO 24V
= 3.6V TO 24V
Typical Operating Circuit
-40°C to +125°C 10 µMAX
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 Thin QFN-EP*
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 Thin QFN-EP*
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 Thin QFN-EP*
TEMP RANGE
V
GSEL
SHDN
Ordering Information
CC
RS-
MAX4070
R
SENSE
GND
RS+
FROM BATTERY
PIN-PACKAGE
REFOUT
CHARGER
OUT
Features
LOAD
TO ADC
2.5V
MARK
TOP
ABN
ABO
ABP
1

Related parts for MAX4072

MAX4072 Summary of contents

Page 1

... 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° ...

Page 2

... V = 24V, CC RS+ RS- SHDN = GND 24V RS+ RS 24V RS- CC RS+ RS- Gain = 50V/V SENSE Gain = 100V/V = +70° GND 2.5V (MAX4072), CC GSEL REFIN = 12V.) (Notes MIN TYP MAX 2.7 24 3.6 24 0.08 0.25 0 MAX 1. 12V 100 120 CC = open, 100 250 ...

Page 3

... 12V, CC RS+ gain = 100 MIN V = 3mV, SENSE T = +25° 12V , V = 12V GND 2.5V (MAX4072), CC GSEL REFIN = 12V.) (Notes MIN TYP MAX ±1.0 ±0.25 ±1 ±2.0 MAX ±1.0 ±0.25 ±1.5 ±2 MAX ±0.4 ±1.0 ± ...

Page 4

... V = 3.6V to 24V (MAX4070 3.6V or 24V 3.6V or 24V GSEL = V = 24V or GND GSEL CC SHDN = V = 24V CC I SHDN SHDN = GND 24V GND 2.5V (MAX4072), CC GSEL REFIN = 12V.) (Notes MIN TYP MAX 65 150 = 2.7V 65 150 = 3.6V 90 250 = 2.7V 90 250 = 3. 2. 3.6V 100 250 = 2 ...

Page 5

... Note 3: Guaranteed by the PSRR test. Note 4: The REFOUT voltage for the MAX4069 should be set such that it does not exceed V voltage for the MAX4072 should also be less than V Note 5: Input-Referred Offset Voltage is defined as the voltage difference between OUT and REFOUT, divided by the selected gain ...

Page 6

... SUPPLY VOLTAGE (V) SUPPLY CURRENT vs. SUPPLY VOLTAGE 140 A = 100V/V V 130 MAX4071 120 110 MAX4070 100 MAX4069 90 MAX4072 SUPPLY VOLTAGE (V) 6 _______________________________________________________________________________________ Typical Operating Characteristics A INPUT OFFSET VOLTAGE vs. TEMPERATURE 150 A = 100V/V ...

Page 7

Bidirectional, High-Side, Current-Sense ( 12V 50mV for gain of 100V/V and 75mV for gain of 50V/ RS+ SENSE MAX4070 REFOUT vs. TEMPERATURE 2.540 2.525 2.510 2.495 2.480 2.465 2.450 -50 - ...

Page 8

Bidirectional, High-Side, Current-Sense Amplifiers with Reference ( 12V 50mV for gain of 100V/V and 75mV for gain of 50V/ RS+ SENSE SMALL-SIGNAL TRANSIENT RESPONSE MAX4069-72 toc19 GAIN = 50 INPUT 5mV/div OUTPUT 200mV/div ...

Page 9

... RS+ and RS- and indicates the correct polarity. V Supply Voltage Input. Bypass V CC Gain-Setting Input. Connect GSEL low to select gain = 50V/V, or connect GSEL GSEL high to select gain = 100V/V. REFIN Reference Input Voltage (MAX4072) 2.7V TO 24V V CC RS+ MAX4069 OUT CSA RS- ...

Page 10

... GND. The direction totally arbitrary. SENSE The input stage of the MAX4069–MAX4072 is shown in Figure 1. Its unique topology allows for monitoring bidi- rectional currents through the sense resistor (R for instance, current flows from RS+ to RS-, the MAX4069– ...

Page 11

... TO ADC -25mV REFOUT 2.5V DISCHARGE CURRENT GND The MAX4069–MAX4072 sense a wide variety of cur- rents with different sense-resistor values. Table 1 lists common resistor values for typical operation of these devices. Listed output voltage is with respect to REF. Choose R SENSE Voltage Loss: A high R source voltage to degrade through IR loss. For minimal ...

Page 12

... These capaci- tors are not required for operation or stability and their use does not degrade performance. The MAX4069–MAX4072 have been designed as a high- side current monitor to ease the task of grounding any battery charger, thermistor, etc., that may be a part of the battery pack. Grounding these devices requires no special precautions ...

Page 13

... Amplifiers with Reference SHDN 10 GSEL RS- 8 OUT RS+ 7 REFOUT GND 6 ADJ μMAX (REFIN) FOR MAX4072 ONLY. Layout PART , the Kelvin MAX4069 SENSE MAX4070 MAX4071 MAX4072 reasonably SENSE TRANSISTOR COUNT: 338 PROCESS: BiCMOS Pin Configurations 1 8 GSEL 2 7 ...

Page 14

... Bidirectional, High-Side, Current-Sense Amplifiers with Reference For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 8 TQFN-EP 8 µMAX 10 µMAX 14 ______________________________________________________________________________________ Package Information PACKAGE CODE T833-2 U8-1 U10-2 DOCUMENT NO. 21-0137 21-0036 21-0061 ...

Page 15

... Bidirectional, High-Side, Current-Sense For the latest package outline information and land patterns www.maxim-ic.com/packages. COMMON DIMENSIONS SYMBOL MIN. MAX. A 0.70 0.80 D 2.90 3.10 E 2.90 3.10 A1 0.00 0.05 L 0.20 0.40 k 0.25 MIN. A2 0.20 REF. ______________________________________________________________________________________ Amplifiers with Reference Package Information (continued) PACKAGE VARIATIONS PKG. CODE T633-2 6 1.50±0.10 2.30±0.10 ...

Page 16

... Bidirectional, High-Side, Current-Sense Amplifiers with Reference For the latest package outline information and land patterns www.maxim-ic.com/packages. 16 ______________________________________________________________________________________ Package Information (continued) α α ...

Page 17

... Bidirectional, High-Side, Current-Sense For the latest package outline information and land patterns www.maxim-ic.com/packages. ______________________________________________________________________________________ Amplifiers with Reference Package Information (continued) α α 17 ...

Page 18

... Added information for RG1 and RG2 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 18 © ...

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