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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 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 1.35V
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
CC
, while discharge current is given from 2.5V to GND.
The MAX4071 is similar, but with a reference 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)
● Low100μASupplyCurrent
● 10μASupplyCurrentinShutdown
● Available in Space-Saving Packages
• 8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)
• 8-PinμMAX(MAX4070/MAX4071/MAX4072)
• 10-PinμMAX(MAX4069)
μMAX is a registered trademark of Maxim Integrated Products,
Inc.
Pin Configurations and Selector Guide appear at end of
data sheet.
19-2423; Rev 4; 11/16
*EP = Exposed pad.
MAX4069–MAX4072 Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
Ordering Information
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* ADH
MAX4071AUA+ -40°C to +125°C 8 µMAX —
MAX4071ATA+ -40°C to +125°C 8 Thin QFN-EP* ADI
MAX4072AUA+ -40°C to +125°C 8 µMAX —
MAX4072ATA+ -40°C to +125°C 8 Thin QFN-EP* ADJ
MAX4070
V
BATT
= 1.35V TO 24V
V
CC
= 3.6V TO 24V
FROM BATTERY
CHARGER
R
SENSE
LOAD
TO ADC
2.5V
V
CC
GSEL
GND
RS- RS+
REFOUT
OUT
SHDN
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 1 Seite 9
- ・ Abmessungen des Paketumrisses on Seite 13
- ・ Teilenummerierungssystem on Seite 1
- ・ Typisches Anwendungsschaltbild on Seite 5 Seite 9 Seite 10
- ・ Beschreibung der Funktionen on Seite 1
- ・ Anwendungsbereich on Seite 1 Seite 10
- ・ Elektrische Spezifikation on Seite 3 Seite 4 Seite 5
