MAX4069, MAX4070, MAX4071, MAX4072 Bidirectional, High-Side, Current-Sense Amplifiers with Reference

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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 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.

Key Features

Applications/Uses

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)

	Cell Phone Battery-Current Monitoring
	Motor Control
	Notebook Fuel Gauging
	Power-Management Systems
	Smart Battery Packs/Chargers

Key Specifications: Current Sense Amplifiers

Part Number

CMVR (min) (V)

CMVR (max) (V)

V_CC (min) (V)

V_CC (max) (V)

I_CC (typ) (µA)

Bidirectional Current-Sense

V_{SENSE_FS} (recommended) (mV)

V_OS (max) @25°C (µV)

A_V (Gain)

Gain Accuracy @25°C (max) (%)

-3dB BW (kHz)

Comparators

Package

Operating Temp. Range (°C)

Price^**

MAX4069

1.35

2.7

105

Yes

50
75

250

100 V/V
50 V/V

100
40

uMAX/10

-40 to +125

$0.95 @ 1k

MAX4070

3.6

120

THIN QFN (Dual)/8
uMAX/8

$0.95 @ 1k

MAX4071

2.7

120

THIN QFN (Dual)/8
uMAX/8

$0.95 @ 1k

MAX4072

2.7

THIN QFN (Dual)/8
uMAX/8

$0.85 @ 1k

See All Current Sense Amplifiers (22)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.